GMC Envoy Problem Report
GMC Envoy Engine Misfire Due to Worn Valve Seat
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. - BassAngler37
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. - blue74nova
engine idles to rough told it was a cylinder misfire what does it involve is it expensive - Visitor
misfire cylinder one, check engine on, "turn engine off" warning sign. no pressure. car white cloudy smoke, irregular idle, loss of power. warranty expired. - Visitor
i have a 2005 envoy with 80K miles, #3 cylinder has 50 Lbs of compression, guess im pulling the cylinder head.... - Visitor
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. - Visitor
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. - Visitor
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. - Visitor
Misfire cylinder 6, dealer (Chevrolet) charged me over $1000 on repairs before diagnosing problem, Now wanting $2612 to repair bad valve. - Visitor
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. - badgergal
Multiple misfires - Visitor
engine missing. problem was # 6 cylinder not firing. turned out to be valve and valve seats on head. Had to replace cylinder head. - Visitor
i have the check engine all the time even if fifed it , it comes back - Visitor
cylinder 5 misfire, stalls at lights , I replaced coil packs and all plugs , rough idle still - Visitor
idle rough, check engine light. no. 3 cyl 70 lbs compression. pulled head burnt valve - blownelco
Cylinder 5 has only 115 lbs and I have the rough idle - Visitor
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. - Nickb123
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. - Visitor
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 - woodnfly
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. - Visitor
power seats do not work what is the problem have checked fuse
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