2003 Venture Missfire on Cylinder 3
 

Hi Everyone, I have tried to search this forum for the answer but can't find it.

2003 Venture 3.4L V6 - 140000 KM on it.

History of problem:
Saturday afternoon I merged on to the highway and after a couple of minutes I noticed that my check engine light was flashing at me. After that when the van was going up hills is really started to shake or missfire. I drove it the rest of the way home shaking and when I finally came to a stop in the driveway it stalled. I was quite sure it was a fouled plug or a coil.

Replaced all 6 plugs and wires. Noticed Old Cylinder 3 plug was wet with gas. Started it up, same problem, running rough.
Replaced all 3 coils. Started it up, same problem, running rough.

Borrowed friends code reader and it says misfire on Cylinder 3.
Checked plug and wire on cylinder 3. They are okay.

Swapped out ICM. Started it up, same problem, running rough.
Cleared codes with code reader.
Then it said random missfire.
I then took it for a 5 minute drive. Codes now read missfire on cylinder 3 again.

Any help with this problem would be greatly appreciated.

Other History:
New Battery Fall 2011.
New Front Bearings Spring 2012
New Front Passenger brake line Fall 2011
New Tires Summer 2010
Installed Class 3 hitch with brake controller Spring 2012.

Thanks.

gomer

Had similar problem, started with misfire on 1st cylinder, and then Temperature Gauge jumping from cold to hot and back and reason for that was Head Gasket.

Is heating giving you a hot air on your car?

See this topic there are more techniques to troubleshoot is that a head gasket or not:

https://chevroletforum.com/forum/ven...problem-46656/

Omg!
 

Thanks Tegnus, you just nailed it. No heat or very little heat in front passenger compartment for a couple of years. Nothing yet from the temp gauge on the engine. I have made an appointment with my local dealer for tomorrow. Fingers crossed its something else, but thanks for your input.

gomer

Sounds really bad, but good luck!

If you are looking at fixing it at dealer/car shop then it will probably be $2000+