Car Problem Reports
GMC Canyon Worn Valve Seats May Cause Engine Misfire
GMC Canyon Problem
Engines Affected: 2.8L 4 Cylinder, 3.5L 5 Cylinder, 3.7L 5 Cylinder
Average Mileage: 98,792 mi (32,546 mi - 221,000 mi)
Visitor, 2005 GMC Canyon, 3.5L 5 Cylinder, 75,000 mi
My service engine soon light would come on and go off repeatedly. My truck began to idle really rough with low rpm while stopped at an intersection. I went to my local GMC Dealer and they diagnosed it as needing new cylinders and the extended 7 year 100,000 mile warranty covered everything.
Visitor, 2006 GMC Canyon, 3.5L 5 Cylinder, 156,000 mi
CHECK ENGINE LIGHT ILLUMINATED, ENGINE MISSFIRE CODE, TRUCK IDLES POORLY, WHILE IN REVERSE IT WILL ACTUALLY DIE AT THE BOTTOM OF DECELERATION AT LOW SPEEDS
Visitor, 2006 GMC Canyon, 3.5L 5 Cylinder, 64,000 mi
Rough idle, Check Engine light (P0300), cylinder leak test shows #2 cylinder leaking (intake valve).
Visitor, 2005 GMC Canyon, 3.5L 5 Cylinder, 106,000 mi
Determined that the valve seats were bad and the cylinder head needs to be rebuilt at the cost of over $2000.00. It is our understanding that GM knew of this problem and didn't notfiy anyone. Also, we have been told that since we are just over the 100,000 mile limit there is no coverage.
Visitor, 2005 GMC Canyon, 3.5L 5 Cylinder, 134,000 mi
valve 2 mis-firing. had to do a valve job.
Visitor, 2006 GMC Canyon, 2.8L 4 Cylinder, 57,600 mi
Multiple cyl. misfiring, gas mileage has depleted drastically. Most problematic gm I've ever owned, sadly disappointed!
Visitor, 2006 GMC Canyon, 3.5L 5 Cylinder, 80,000 mi
I believe this is the problem with my 2006 canyon. I have brought the truck in at 33000 miles when check engine light came on, they replaced the emissions canister valve, computer read po 300 and po499. I brought truck to a shop when light came on again and was told to bring to a gmc dealer because test was done and he found cylinders 2 and 5 to have misfired the most. Gm service ran the computer again came up with po 300 and po 449 again. They wanted to replace the same part I replaced under warranty a few years back.Replaced the part and was right back the next morning with check engine light on. hooked to computer again and still reads po300 which is a misfire but they claim the leak down test is within the allowable range and have no idea what is causing the misfires. waiting to hear what they come up with next. I think it may be time for me to call GMC myself and start complaining.
Visitor, 2006 GMC Canyon, 3.5L 5 Cylinder, 83,254 mi
just started waiting to find a fix
Visitor, 2004 GMC Canyon, 3.5L 5 Cylinder, 110,000 mi
No compression in cylinder 2 & 4...will probably have to replace engine...LAST GMC I will ever own. Had oil changed every 3K miles and always babied this truck....really let down...looking at a Nissan with a more reliable V-6.
Visitor, 2004 GMC Canyon, 2.8L 4 Cylinder, 221,000 mi
changed the spark plugs but every so often it misfires