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Exhaust System / Catalytic converter seems to be damaged or clogged. Almost no exhaust flow causing lean condition and lack of engine power
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Hello everybody! Good day to you! Welcome back! Glad you were here. Welcome to project Mazda CX-7 See if this thing's going to stop. It's got a new battery I heard it uh did not crank did not start at 137 400 miles on the odometer. All right starting Z Engine cool beans.

Alrighty so I've got a quite a list of things we're going to look at here: I Think this car has been laid up and parked for a while and uh, we want to bring it back to life. It's got some AC noises. It's got some oil leaks. it's got this going on I'll fix that later.

So uh, what? I'm gonna do I'm not gonna drive this thing. it has not. uh, been on the road for a while and I don't know this car. so I'm gonna I'm gonna put it on the lift and inspect everything before.

I uh before I go ride around in public roadways make sure she's safe and all that good stuff. So I'm just gonna go ahead. we're back in this bad boy into the shop. We're gonna round the corner of Death In Reverse We're gonna get it back into my corner.

We will get it up in the air and start. Uh, start inspecting slash diagnosing. I've got a list like I said. we're gonna go with the list and uh, prioritize things and then we're gonna go from there.

So stay tuned because this is going to be a very good video opening. Z Hood see mirrors are good. That's how we Parks the Autos properly. all right parking powering down.

begin inspecting, popping. oh that was already popped. fail I Restarted because one of the complaints was a buzzing noise I think it's the AC compressing unit and I concur I think see what we have here? Uh, we got a noise. can I tell you what? I'll do I'm gonna run into the cabin and I'll turn off the AC if the noise stops and we know it's the compressor off again.

All right. That confirms that the uh, the noise is in fact that compressing unit. I'm adding that to the list all right now. I Can see it's got some new coils in there, so I'm going to assume it has a new spark plugs.

Um, it does have a drivability complaint I Guess it loses power under load on occasion. That's a little odd. Uh, see here there's some kind of liquid. I Believe that engine mount is a liquid filled Mount and it's broken.

You can see where it's been spilling down down onto the body. Okay Add that to the list. see they said they wanted something done about this. uh PCB hose right here I think that's what that is that needs to be replaced.

You know there's a lot of stuff going on here. My issue is there used to be trouble codes in this and I understand that since it sat with the dead battery for a while, the ECM has erased uh, all the data. The check engine light is no longer on. but I'm going to go into it anyway and see if some of that information is still stored in memory.

Yeah, although the light is not on, that does not mean that the code is not here anymore. It just means that, uh, the request for the malfunction indicator lamp is no longer active. Sure, let's plug this guy in. I Mean the codes could be gone, but uh, we don't know until we know.
So let's find out. Mazda Automatic ID initializing satellites linking up in outer space communicating communicate Faster Come on there we go. Do it. 2007 Mazda CX-7 2.3 liter four-cylinder doke turbo powered federally missions dope.

uh dual overhead cam. It's just fun to say it as a dope. Let's go into engine and that compressor is super loud. Codes: menu, Memory codes continuing blah blah blah yeah yeah, no codes present.

That's unfortunate. I was hoping to find trouble. Codes: No worries. All right.

What I'm gonna do is hop out and set the rack on this. Uh, before I shut her down. I'm going to let this thing code scan all the modules and I'm gonna do that because I do have some warning indicators. We've got a traction control and a TCS off warning indicator.

Don't know why it's turned off. Probably it's disabled due to a fault. Well, that was fast. Look at here.

lots of loss of communication. A lot of you codes ABS has a U-code steering wheel, angle sensor, position zero not found. All right airbag, a bunch of Uh U codes in the all-wheel drive module. The Gem has a low battery code so some of this may have been in here due to the battery having been removed for a while.

So since we don't know what the deal is with that, I'm going to clear everything and uh, and we'll just kind of restart with a fresh, fresh palette so to speak. Those low voltage codes and those U-codes with a missing battery could have very well been the cause for all those to have been set. You know, clear trouble codes, blah blah blah. All right, let's let it do that.

I'm gonna rack this thing up. We're gonna take a look at the undercarriage and see what we can see moving on up. Okay, now my primary complaint here is uh, that this thing intermittently loses power while driving. After a couple minutes, they say it runs and idles fine and it's got power down low.

but then while driving it, it seems to act like it runs out of gas and as I walk by I noticed I'm not getting much exhaust sound and I'm certainly not getting any flow out of this thing. I'm I'm suspecting that one of the cats is clogged up. so I think what I'll do is I'm pulling my my laser imager device right here. power on and we're gonna see if we have a huge temperature differential here at the uh the cat converters.

If it's really cold over here and really hot over here, then we know that we're not getting any flow. So let's take a let's see now. the heat shields are messing us up a little bit, but we'll see out back. we've got.

we'll call it 260 degrees dude. No. No. 230, 220, 100 something 180 How about deep inside of the cat? see what I can see in there 317 and then up front? These heat shields are messing me up a little bit.

I don't can't really see foreign I don't know 150 out I Don't know if we're getting a lot of flow here. Uh, let me put in a throttle stop and we'll just go out back and feed it. Let's try that. We'll give it uh some.
RPM Then we'll come back here and check the exhaust and see if it's actually flowing. Come down all the way down All right. So we're coming in. Got this little caulky gun uh, throttle stop device here that's going to go down on the gas pedal accelerator pedal I Don't like to say gas pedal, it's an accelerator and we just squeeze that a little bit we're gonna raise.

RPM Where are we about 2200? That's good and out back. Nada, We're getting no flow back here we have a clogged exhaust. see if I cannot demonstrate that's not gonna work. Blue Towel Diag Here we go look at that.

Nothing and nothing that's confirmed diag on uh on a clogged converter. So we have an exhaust issue. We don't need to run this anymore powering down. Let's get out of here.

we're moving back up. Let's see if we can't uh, unbolt that converter and take a look-aloo inside. all right now we do have a slight issue going on here. see this is the Uh post cat I think I believe there's a secondary converter or I'm sorry a primary converter farther Upstream but we can't get to that one because it's like bolted on the back of the head and the Turbo.

So what we will do is disconnect this converter and we're going to drop this down. take a look inside and see if this one is damaged or if that one is damaged or if both of them are damaged. So let's see if this is going to come apart easily or not easily. I Don't know.

Yeah should be easily. We need lubricant. Lots of it here. We'll give this some.

uh. foamy BG penetrator oil treatment not sponsored. That's just. it's just what I use and since the penetrating Lube debate rage is on and TV Blaster is better in the hearts and minds of some, I'll use that too.

So now we got twice as much Lube It's a good time now. let's see if this is gonna crack loose or not unique. Yeah, that's better. Oh, it's smoking.

exhaust must have been a little warm. There we go. Power tools? You don't work. Yeah, there's one.

uh, that one. I can't get a tool on. We'll try that later and this one. same thing.

Hang on. More extensions. Why? I Love wobbly extensions. Check this out.

Angle's not great but that's tight. No don't you break I'm not having that towards you. Wow. Yeah, we need more lubricant that's in there.

Good old exhaust bolts. See what had happened was was the TV Blaster contaminated the other oil? It's rendering it ineffective. Probably not, but sounded cool. Oh no, that's not gonna work.

more lubricants. I'm gonna come off now. Come on. Come come give up.

I Suppose power tools are not always the answer. So sad there we go. Come on out of there please. I said Please We're not gonna have a Avalanche Repeat.
Not on this thing. No victory. We did pull the threads out though. it's not cool.

Okay numeral face. that one's gonna come off. That's good. They're all coming off.

Yeah, See, we're not even inspecting yet. we're just diagnosing. Still, sometimes that's how it has to go. Feel your stuff falling out of the exhaust I wonder if it's a catalyst material? Foreign.

We need some thermal insulation. A lot of friction in those threads. All right. So what we need to do is get this uh, converter separated from the rest of the exhaust and drop it down some which can't do yet because the hangers are still hanging it.

So let's pull these hangers off next and I have a tool for such things for years and years and years. I Did this with pry bars not realizing how easy it actually was with the proper tool. There's one. pull that second hanger off and this thing should drop down enough to, uh, take a look inside.

It says there we go. All right, let's see what we can see inside of here if we can see. And the survey says this converter that one looks okay and that's not damaged. You see the honeycomb in there? All right.

That tells me that the one that is, uh, the Restriction is the one up front on the on the back of the engine. It's that one way way up there behind this, uh, drive shaft and differential. Okay, let me go see if I can, uh, find these parts and uh, we're gonna go from there. All right coming down.

We're gonna start this and it's gonna be loud and I'm gonna check the rear of the front converter to see if there's still no exhaust flow. I Imagine if it's melted, it's melted up in the front. but uh, we're gonna just verify that with no again gonna be loud. Let's get in here There we go.

Restarting is the engine ring? Actually, it's not very loud. Okay, all right. going in, going in, going, and going in. what do we have? No very much.

Yeah. I know there's there's almost no flow here. All right. So I'm gonna seal this up ever so slightly just with some pliers for now.

All right, the leak is semi-sealed There you go. All right. So after a few seconds of run time I think it's built up some pressure here because now I can hear a little bit of a leak. You see that's not fully, uh, clamped on or anything like that.

There's a gadget up top, not much of one, but it is pushing its way past the seal so there is some back pressure forming. Let's uh, let's scooch out back and take off the muffler. Oh, unclick that and one more over here. I'm glad these bolts are coming off easily.

Number two, Hear that? Okay, let's see. Pry bar. Pry bar. Need a pry bar separate this? um, get it apart.

There we go. I'm going to have to, uh, probably take this thing out on the road and drive it until we get that check engine light to come back on. Um, like I mentioned earlier I didn't want to drive it until I inspected it I've inspected it. Uh, so let's go out, hit the road, see what it does, and uh, and then we'll go.
from there, it's gonna be a little bit louder than when we brought it in. I have, uh, removed the muffler and remained left disconnected. Uh, just to verify that that, uh, that's not causing our issue struck become unstuck. There we go.

Okay. Turbo four-cylinder will close you for now. What I'm going to do is go ahead and, uh, start this thing up. We'll pull it outside real quick, let it idle come up to temp.

T is this was interesting. Starter wasn't too happy. You hear that angry starter? look at there. check engine lights on now.

Maybe I don't have to go very far after all. let's just go ahead and check that right now. let's see. he'll plug that guy into our onboard diagnostic two port selecting scanner.

You know now that I mention it. that makes sense because this may have been just this car's third or fourth restart since. uh, since that new battery got tossed in there. So if we've got a light, that means we have a code and if we have a code then we have some direction.

This is good. Yep. 07 CX-7 engine codes. What's up? What do we have? codes? Menu Memory Talk to me Goose initiating system: Lean at Idle Bank One P2187 Lean at Idle Okay, we're good somewhere.

so let's go into data: We'll pull up field trim data, fuel trims and O2s not supporting all Pids, blah blah blah. Long-term fuel trim 20.3 percent. That's that's pretty much out there. that's maximum.

Hmm O2 Sensor voltage O2 Sensors not doing much. Yeah, let's go and hit the road real quick. see what it does. Kind of pulled up some graphs before we go.

This is our heated oxygen sensor that's a Bank One sensor one that's Upstream of the cat. In this particular case, it's actually in the cat. and I'm going to monitor this thing's voltage now I Can tell you right now off the bat, this is not doing what it should be doing. We should be seeing a graph that switches from high to low and high to low.

Similar to this little Peak right here, but it's just kind of hanging out down here. now. this could be a faulty sensor and it could also be the fact that there, uh, there is a air fuel ratio problem and it's just stuck. stuck clean.

which again, we can get that with a clogged converter. but a test drive should help clear a couple things up. Okay, so taking a look at our O2 sensor graph again, it's really tough to see bright lights. It has a it's kind of Switched its position.

it's It's now on the high side of our graph, but it's not doing anything. still, just kind of hanging out all stagnant dings you built. okay I can uh I Definitely smell. something in here.

Smells like rotten eggs. It's got no power. Very very light power. I I Think that that front cat is clogged.

It seems to be uh, seems to kind of be where we're at here now. I'm not going to be able to really take a back pressure reading from that because the Uh wideband O2 and or oxygen sensor is actually located in the center of the cat. So if there's some damage to the front of that converter which is going to be right at the at the exit area of the of the turbine not compressor, see me right at the exit of the turbo. If that cat is damaged or melted or restricted there, the back pressure gauge will not show a reading because the pre the gauge is going to be farther Downstream than the potential obstruction.
but uh, kind of based on how it's performing, what we felt at the exhaust and and the smell that I'm smelling inside here right now. I Do believe that there's an issue with that converter so unfortunately I'm gonna have to pull that converter down and visually inspect it and I guess go from there. So uh let's get uh back to the to the shop real quick. I don't need to be here out on the road longer than necessary schools on zone so I'm gonna swing this thing back around.

we're gonna head over to the shop and I'm gonna see if I can't locate and price one of these converters and I guess we will go from there. Let's try. Full Throttle real quick. Yeah, this thing doesn't go anywhere.

This is. uh, it does not run like it's got a turbo. I Can tell you that it runs like no boost. Alrighty, we return.

I'm gonna go ahead and park this vehicular module right here and uh, head into the office. I'm gonna price all this stuff out and uh, we'll go from there if I'm gonna do this. uh, converter removal. Uh, probably gonna do that on another video or maybe even two because that's uh, I think it's like a three and a half or four hour job.

So that being said, I'm gonna go ahead and close this particular video out right now and I will do that by thanking each and every one of you for watching this video. Hope you enjoyed this diag video So again, as always, thank you for watching I'll see you on the next one. And most importantly, do not forget to have yourselves a great day! See you guys later! End of Mayor's Day and powering down.

92 thoughts on “Customer states: losing power while driving running lean! 2007 mazda cx-7 2.3 turbo”
  1. Avataaar/Circle Created with python_avatars MoMan01 says:

    We had to fight collapsing interior exhaust walls in Ford LTD’s. I just got to where I would drop the exhaust lead pipes from the manifolds and take them on the interstate and find out real quick. Ford only wanted you to replace a piece at a time but after getting a warranty bill for the same labor over and over they got smart and replaced the whole exhaust. Back then there was no stainless steel exhausts yet.

  2. Avataaar/Circle Created with python_avatars Jonathan A says:

    So what's the update on this???

  3. Avataaar/Circle Created with python_avatars Dean t says:

    New timing chain then

  4. Avataaar/Circle Created with python_avatars Michael Plumacher says:

    I am going to guess by the new coils (prior repair) it was run with a misfire for a while, dumping fuel into the converter and melting it down. Or not, lol. I have seen this happen with the Ford Escape 3.0 engines. Hope we get a follow up on this one.

  5. Avataaar/Circle Created with python_avatars Ivan Olsen says:

    so how does it run with blocked exhaust ….. that's a lot of air coming out some where…. nest in the exhaust ?

  6. Avataaar/Circle Created with python_avatars Felgercarb says:

    My dad always said that the right tools for the job is the job half done. And knowing where your tools are is the other half. Best regards from Denmark

  7. Avataaar/Circle Created with python_avatars zepp3lin says:

    So who is your assistant there? No introduction?

  8. Avataaar/Circle Created with python_avatars The Legendary WASD Gamer says:

    Ray you can also confirm a clogged cat if the exhaust is hot and sticky/ moist. When my daily started losing power I just went behind the car and felt the exhaust and was like yup clogged cat even confirmed it more by unmounting the cat from the manifold and stuck a scope down and saw it clogged to hell lol.

  9. Avataaar/Circle Created with python_avatars The Legendary WASD Gamer says:

    I just gutted my dumb ass cat (lol). Problem solved.

  10. Avataaar/Circle Created with python_avatars Jess Treloar says:

    The Corvette just run now.

  11. Avataaar/Circle Created with python_avatars JO65 says:

    Aftermarket cats are alot cheaper

  12. Avataaar/Circle Created with python_avatars Jimmy cheese says:

    There is no way you could remove those nuts and pull apart the exhaust on a northern car. It would be like working on the Avalanche again.

  13. Avataaar/Circle Created with python_avatars George Brown says:

    Because he is an honest and thorough mechanic, he will always have the business. I don't know why people cheat the customer. They win in the short term but lose in the long run because word gets out.

  14. Avataaar/Circle Created with python_avatars chris herl says:

    Ray, what are your thoughts on a stored code thats been hanging around but no check engine light.? Its a turbo overboost code but again no cgeck engine light!

  15. Avataaar/Circle Created with python_avatars tim moore says:

    Lube them exhaust bolts whiles its sitting and waiting should let it soak in and work better.

  16. Avataaar/Circle Created with python_avatars Jim Hall says:

    Given most situations on a vehicle, probably having to remove anything in the exhaust system would be my last ditch effort or enough to make me think twice if I want the headache.
    Some bright engineers need to redesign them so they don't meld together and require torches, extreme heat and dealing with broken studs and such.
    At least you have a lift. I've only done them on the floor, being a home mechanic.

  17. Avataaar/Circle Created with python_avatars Anthony Fogliani says:

    Loving the Alice in chains in the background 😁👍

  18. Avataaar/Circle Created with python_avatars Agostino DiBella says:

    I am assuming that a bad O2 sensor caused the cat to go bad in the first place.

  19. Avataaar/Circle Created with python_avatars Pet Rock's Garage says:

    Is the white corvette in the background at the beginning of the video a customer vehicle we will see soon, or a permanent lot resident? Would love to see some vintage vette action! Maybe fix the headlights to not stay up all the time so others can see how and fix their vettes? I see that issue on so many vettes on the road and it makes my ocd act up! Thanks!

  20. Avataaar/Circle Created with python_avatars GO SkidMaRk says:

    You thought you could sneak past that Stingray… Ray? I bet it has a carburetor issue.

  21. Avataaar/Circle Created with python_avatars Howard Benally says:

    Hi Ray just finished watching video excellent learning about cat learning’s a lot thanks and as always you and families be safe 🇺🇸🇺🇸

  22. Avataaar/Circle Created with python_avatars drumyzeb says:

    I’m convinced you are trolling us with 4 Non Blondes. Nice job.

  23. Avataaar/Circle Created with python_avatars wreckloose says:

    Can't believe you bought the SnapOn FLIR, expensive!

  24. Avataaar/Circle Created with python_avatars Kenneth Shilts says:

    Most shops depend on customers finding them not yours you have a closed 6-foot high gate and fence. I am glad it works for your business. Great videos.

  25. Avataaar/Circle Created with python_avatars Bad Batch says:

    The only time you wish someone would have stolen your cats while it was parked up.

  26. Avataaar/Circle Created with python_avatars Wes Gregg says:

    So there are multiple exhaust issues – slagged cat blocking flow… and one or more massive exhaust leaks, where that flow must be escaping.

  27. Avataaar/Circle Created with python_avatars Demuth says:

    Is that the new petey in the background ?

  28. Avataaar/Circle Created with python_avatars HouseCallAutoRepair says:

    On the edge of my seat for this one!

  29. Avataaar/Circle Created with python_avatars jeffrey robinson says:

    I owned one of those cx7's over here in Australia about every 5 to 10 thousand k's the add_ blue pump or what ever used to play up i had a new one sent from Japan took two month's to get . Fixed the problem for about 10 k. Ended up selling it to much of a pain in the arse pity because i liked Mazda's.

  30. Avataaar/Circle Created with python_avatars Gregusjay says:

    another enjoyable video !! 🙂

  31. Avataaar/Circle Created with python_avatars Steven Chang says:

    Been watching your video and do not expect you will handling cx7 turbo (my family car). Good to see some or more action on this car. This is a beatiful suv but bad design on the engine and turbo. Replacing parts will take ages (if you know what i mean). I may give you some tips on replacing the PCV valve (which nearly kill us when the car goes lean on interstate with max speed 45 mph) and top up with premium gasoline.

  32. Avataaar/Circle Created with python_avatars tom TKE says:

    If… IF … if there's significant exposed thread would chasing it with a die be appropriate??

  33. Avataaar/Circle Created with python_avatars tom TKE says:

    Ray! When learning basic electronic troubleshooting one first step (after visual inspection &.voltage/ground) was 'half-split.' I.E. look for signal HALF WAY between start and end.

  34. Avataaar/Circle Created with python_avatars David Anderson says:

    What caused the damage to the cat

  35. Avataaar/Circle Created with python_avatars Scale Auto Guys Workbench says:

    Hasn't it gotten old for you to have to manually open and close that gate every time that you go through it? Love watching your videos.

  36. Avataaar/Circle Created with python_avatars James Tone says:

    Use the Kroil in the orange can you showed on the door hinge… it’s better than all that other stuff

  37. Avataaar/Circle Created with python_avatars tom TKE says:

    My amateur hyporhesis: Really good techs like Ray can salvage auction cars; repair them: sell to make a huge profit.

  38. Avataaar/Circle Created with python_avatars Brenda Daniels says:

    Love your videos. Miss the long videos. Thank you for all the great content.

  39. Avataaar/Circle Created with python_avatars Mega Wega says:

    I enjoyed this video. Have yourself a great day, Ray.

  40. Avataaar/Circle Created with python_avatars Todd Yeomans says:

    Your diag vids are my most favoright 😂

  41. Avataaar/Circle Created with python_avatars Robert Turner says:

    You can certainly tell when YouTube videos are good. You have to watch several commercials before you ever see the clip and them more as the clip plays.

  42. Avataaar/Circle Created with python_avatars Robert Sturtevant says:

    Loved the “that’s a good time” comment after you said “I have twice the lube”..😂😂

  43. Avataaar/Circle Created with python_avatars Matt Free says:

    So tell us young Ray who is the other tech working in your shop in the background of this video hmmm it’s not wife unit so cough up my friend 😊