This is a 4.3 l V6 from a 15 Silverado. Little guy was littered with misfires and had one dead cylinder. Based on the one fuel soaked piston and spark plug, carbon build up, compression loss, I had to dig deep to find the problems. And nope...it didn't have a leaking head gasket.
Customer states engine is rough. confirm a misfire diagnosis with pb blaster? yup!
Looks like Seafoam should have been used a few times a month.
That engine spent a lot of time at low/idle speed.
GREAT DIAG!!
Seafoam treatment every 6 months or every other oil change really does help with direct-inject engines.
Treat it with Zmax it will be okay.
This is why I bought a Ram with a 6.4 hemi and when it gets sluggish I just floor the thing and problem solved. And I run 93 octane. It is a little expensive changing 16 spark plugs though.
Caused by crappy gas with heavy carbon?
If that owner would have sprung for some fuel system cleaner once in awhile the carbon wouldn't have been a big issue.
Take a spray bottle of water spray it down your intake while holding the engine at 2500 rpm. Do this every oil change. It will steam clean everything. It won't stop carbon build up but it helps. Seafoam and Barryman work also. Better than letting it get this bad.
Gasoline works better
Induction services(done properly) are more important than ever, as are oil changes. Good quality fuel or carbon reducing additives will also make a huge difference.
Direct injection isn’t causing these problems.
looks like a LS/LT with two cylinders cut off like the old sbc days
Bought a used VW Tiguan. It had direct injection too. It also had horrible top end oil leaks. Cost to do both was more than the car was worth. Owned it less than 3 months.
Why do those combustion chambers look so bad? Is it fuel/fuel quality? Fuel additives?
This is quality video to show the customer to prove you are not bullshitting about the repair
Real problem is that it’s missing 2 Cylinders
because its a chevy
There's just nothing like taking your car in for a "little" misfire diagnosis, then coming back a few hours later to find the engine disassembled all over the shop.🤣
I've always just used gas to check for leaks. Also pour oil on the pistons to see how fast it leaks past the rings. Not sure on the year but alot of the vortec engines have a issue with the pcv in the valve cover becoming clogged which will cause this build up.
Since when did this engine get DI? I thought it was the last living relative of the 350 (port injection most practical means of injection possible other than TBI).
A v6 version of the LS engine. smh
That's the coolest test I've ever seen. Thanks
Let's guess direct injection engine. ??? Carbon build up !!
Looks like it had an informal EGR system.
No leak down tester?
You did compression test but did you do a leak down test, could've figured this out without pulling the heads
GM motors suck
Customers first problem was buying a GM product!
You know how to take it all apart. Valve job is so easy compared to what you did
Cool move.📡👽🇺🇸 MOTOR!!!
Just buy a honda or a toyota. My shit still drives with 50,000 kms on the oil
Cant fix a defective motor from factory. Most well scrap it
Double dog damn! And I thought my engine had a lot of carbon buildup!
Being the "owner" of this truck, I'm the fleet maintenance foreman for the place that is the big green square on the side of the truck, I can tell you that the gasoline that is run in this truck is the cheapest you can buy. Bean counters making all the decisions. We fight carbon issues with most of the fleet. The direct injection just exacerbates the issue for sure. We are a man down in the shop and well behind in PM's so we had to pawn this one off on you guys. Kinda glad we did. Funny to find this video while surfing YouTube.
LV3 engine ?
Problem is. It’s missing 2 cylinders.
And yet another good reason why I daily an old carbureted car.
Using a little gasoline is a bit of an easier way of doing that, but I guess if you don't have any on hand that way works too.
Even that V6 still uses technology from the 1960s sheesh, when will GM innovate. Still using push rods?
Might as well check the cam
What engine is this? And can I expect to find this this problem on many of this same engine?
It's because it's a chevy…
One hell of a leak down test….
What was the mileage? Did it actually have misfire codes on all of those cylinders? A leaky valve definitely isn't good, but doesn't automatically cause a misfire either.
Loads of carbon scoring.. I'd say you were in a blaster fight.
You're a damn genius….
Well no shit its missing two cylinders