GMC Envoy Problem Report

GMC Envoy Engine Misfire Due to Worn Valve Seat

(31 reports)

The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Replacement of the cylinder head may be required to correct this concern.

My check engine light came on. I took my car to a local mechanic and had it checked out, the mechanic plugged his device in my car and it read misfire in cylinder #4. The mechanic looked further into the problem and found out that cylinder #4 read a low 70lbs of compression and cylinder #3 has 120lbs of compression. He explained to us that the low cylinder compression was the reason why our car shakes while idling and runs rough when accelerating. He advised us to buy a new car or get a new engine. -
Cylinder 5 misfire , Pepboys said it needs a valve job , for $3400 and now GMC dealer says the head is leaking and it needs a new head, possibly a cracked head?, I read that this is a common problem and GM has changed this head five times so far, so they are prob trying charge me for a new version head and a vale job , $3500 to $4000, this car is way too new for this kind of problem, I don't tow anything with the Envoy or drive it hard, my wife actually drives the kids to school in it. There should be a recall on this problem, instead of keeping it quiet and letting the customer pay for this, I'm not sure what to do, but I know I won't buy another GMC. -
engine idles to rough told it was a cylinder misfire what does it involve is it expensive -
misfire cylinder one, check engine on, "turn engine off" warning sign. no pressure. car white cloudy smoke, irregular idle, loss of power. warranty expired. -
i have a 2005 envoy with 80K miles, #3 cylinder has 50 Lbs of compression, guess im pulling the cylinder head.... -
I have a check engine light. I took it in a found out that it is my valve. Cant fix it right now. Driving minimal. -
Engine misfire at cyl 6. New plugs, etc., cleaned injectors, replaced intake manifiold gasket. No change. Removed head and had a burned exhaust valve at cyl 6. -
My engine has a blinking light on. mechanic says its the cylinder 1 has no compression that's why the truck is misfiring. I don't understand the truck was running perfectly until a cold day came through and I turned it on. it was making a loud clicking noise. -
Misfire cylinder 6, dealer (Chevrolet) charged me over $1000 on repairs before diagnosing problem, Now wanting $2612 to repair bad valve. -
Shake when driving slowly or stopped. Put on scanner showed #6 not firing. Changed plugs, coil packs, and injectors. Now it worse. Not fixing it yet. -
Multiple misfires -
engine missing. problem was # 6 cylinder not firing. turned out to be valve and valve seats on head. Had to replace cylinder head. -
i have the check engine all the time even if fifed it , it comes back -
cylinder 5 misfire, stalls at lights , I replaced coil packs and all plugs , rough idle still -
idle rough, check engine light. no. 3 cyl 70 lbs compression. pulled head burnt valve -
Cylinder 5 has only 115 lbs and I have the rough idle -
Engine check light came on. After inspection, engine needs a valve job. I was told this is a design problem with many Envoys with same engine needing this fix. -
Was told that it needs a cylinder head . Misfire on #3 has been coming up. Had checked out many times . They thought it was Fuel injectors. at first . Then diagnosed with losing compression on 2 cylinders. -
Check engine light came on, had it diagnosed(#4 cylinder misfire) and was told #4 cylinder had only 90lbs compression and needs valve work - very costly (estimate given .$2k -$4k) Very disappointed only 78,000 miles tune up not even required until 100,000 miles -
Still having this problem. Cylinder 6 mis-fire. Took to dealer and being told low compression and it is a problem with the valve seat and that the entire head needs to be replaced. -
Related Items:
power seats do not work what is the problem have checked fuse
Car runs great. What can cause a P0300 code and how can it be repaired.
Took my 2006 Envoy in to get the state inspection and was informed they could not perform the i...
THE CHECK ENGINE LIGHT HAS BEEN ON FOR SEVERAL WEEKS NOW. I NOTICE NO OTHER PROBLEMS WITH THE...
My check engine light was blinking and code 1680 was the code when scanner?Tech said to run and...