Engine Misfire Due to Worn Valve Seat on Chevrolet Colorado

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 108,330 (33,500–270,000)
Engines affected: 2.8L 4 Cylinder, 2.9L 4 Cylinder, 3.5L 5 Cylinder, 3.7L 5 Cylinder
6 model years affected: 2004, 2005, 2006, 2007, more2008, 2009
147 people reported this problem
Viewing 1 - 20 of 78 comments
About 6 months ago my truck started the same misfire problems I've been reading from other owners.
I have taken my truck to be looked at,and I was told that it would be around $2500 to $3000 for repairs.
It's something when you spend $30.000 for a truck and take very good care of it,inside and out.and the dealer you bought it from tells you.he has had many reports about the same problem.Why is there not a recall put in place for this problem.I am the last person to beat up my truck or drive it like a teenager.This issue needs to be addressed to the manufacture and a recall needs to be put inplace.
So, I just failed my emission test. Said my # 5 cylinder is misfiring. I replaced coil and plug with no change. Now I find out that GM has valve seat problems with this engine. If it is a common problem do you think GM will stand behind their engines and repair them or do I have to pay the total amount >|???

I have the exact same situation occurring and it is specific to cylinder #5.

My question is:
- If I live with this for quite some time (some medium-rough idle on occasion), will I dig myself a deeper hole? I'm trying to see how long I can avoid spending the $3,000 w/o any additional repercussions. If the only downside is a rough idle w/o any possiblity of additional damage, then I don't mind the occasional rough idle :)

check engine light solid always -3&5 cylinder misfire code stalls alot when stopping slowing down in traffic i have replaced spark plugs all coils
It seems this problem has been going on for sometime my truck only has 43,000 miles on it it should not have worn valve seats with this low milesage General motors should stand behind fixing it my repair shop says it will cost Around $3,000 to fix it.Allen Weatherman
runs rough at startup , slight miss when idling , check engine light comes on. Ran checks on injectors , coil , changed plugs the miss is still there. My mechanic is sure its the valve seat in #5 cylinder. This just happened so its not fixed yet but estimated cost is $3K.
wow sure seems GM has decided to turn its head and not address this very costly problem - 3.5 Inline 5 cyl I had to have the cylinder head rebuilt and it also needed pistons/rings work because it ran too long miss firing. seemed to run fair. I would recommend fixing the trouble as soon as you can and save repairing more on the engine then just the cylinder head. live & learn . Expensive lesson
same problems with the check eng light. Took it to the dealer and they replaced the head for free at around 90K then the same thing is happening within 20K of the work being done to it.
Truck had harsh vibration at idle. Dealership repaired it by replacing cylinder head. Was a free repair under a recall.
#2 cylinder bad. Runs rough w/engine light on. $3500 to fix. There'll be-no cost coverage by Chevy. What?? The dealer says the "campaign" (not recall) to rectify this known problem is over, but they'll "work with us" and will give us a $250 discount. Ha ha.

My hubby has owned 3 Chevy's in a row, so he's been a loyal customer. Loyal customers don't deserve to be rewarded with this sort of rip-off. He has babied this truck from the start, but now it's toast. Agree with a previous poster - we'll buy Dodge, Ford...anything but Chevys from now on.
Check engine light. Failed emissions. Misfire code. New motor very costly. Started around 65K miles. Will not buy another Chevy.