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Old 03 May 2012, 09:42 pm
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Question head problem?

Would like to get some thoughts on a problem. I have a 2002 cruiser with the 2.4l with a 604 transmission. There is dtc po303 misfire cyl. 3. I replaced plugs,wires,coil and fuel inj. for #3 cyl. Code is still there. Done a compression test on that cyl. and it was only around 90. The other ones was around 180 to 190. I have been told that its a head problem.The car has just over 125k.This started out with rough idle at a stop in gear every now and then, but ran fine once moving. I never have had a overheating problem, only some oil usage every so often. When i got the car i was told that the water pump and timing belt had been replaced but don't know for sure. I rebuild transmissions for a living now for about 28 years, but when it comes to this I know my limitations. Any thoughts on this I would appreciate.
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Old 03 May 2012, 09:59 pm
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Default Re: head problem?

Quote:
Originally Posted by darrellfin300 View Post
Would like to get some thoughts on a problem. I have a 2002 cruiser with the 2.4l with a 604 transmission. There is dtc po303 misfire cyl. 3. I replaced plugs,wires,coil and fuel inj. for #3 cyl. Code is still there. Done a compression test on that cyl. and it was only around 90. The other ones was around 180 to 190. I have been told that its a head problem.The car has just over 125k.This started out with rough idle at a stop in gear every now and then, but ran fine once moving. I never have had a overheating problem, only some oil usage every so often. When i got the car i was told that the water pump and timing belt had been replaced but don't know for sure. I rebuild transmissions for a living now for about 28 years, but when it comes to this I know my limitations. Any thoughts on this I would appreciate.
You already know the answer. Ether a valve or more than likely head or head gasket.
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Old 04 May 2012, 05:40 am
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Default Re: head problem?

Thanks for the info. I just didnt know if there was anything else to look for while it was down.
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Old 04 May 2012, 08:11 am
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Default Re: head problem?

Check mater's makeover II, bottom of last page. He's having that very same problem. Maybe that could be helpful to you?
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Old 05 May 2012, 08:55 am
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Default Re: head problem?

Thanks for the help. A quick update on my quest to repair my cruiser. I removed the valve cover on my way to pulling off the head just to see if there was a valve spring broken on the # 3 cyl. I decided to check the compression again on that cyl. and now its reading 130 to 150. I removed the gauge and reinstalled it and got the same thing. When I checked it the other day it was only 80 to 90. If this is a head problem what would my findings mean?
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Old 05 May 2012, 10:52 pm
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Default Re: head problem?

NEVER take a compression test unless you're willing to rip apart the engine.

'01 and up switched to smaller, and evidently poorer exhaust valves.
Every once and a while you hear of one burnt.

If you're getting good numbers on your second check, accidentally leave gauge behind tire and back up.
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Old 06 May 2012, 06:53 pm
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Angry Re: head problem?

Right now that sounds like good advice! I want the car fixed but wonder if there is something I am missing. Removing the head is a big deal . I'm still trying to understand if it is in the head then why does it run so good when pulling away from a stop and runs so well just driving it down the road. someone said i needed to check the lower intake gasket where it fits into cyl.3 to see if its leaking, or if there is a problem with the intake itself. I am at a loss at this moment.
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Old 06 May 2012, 07:11 pm
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Default Re: head problem?

Maybe a peace of carbon stuck on the seat area of one of the valves, and caused the original reading. Just a guess. UptownSport could better come up with an explanation. I'd refire and then check again. If checks out then. leave it alone.
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Old 06 May 2012, 07:51 pm
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Default Re: head problem?

Thanks for all the help and advice on this guys, I sure do appreciate it. Hopefully I can find something wrong except a head problem. For fun and giggles I just went out and checked the temperature with a infrared laser thermometer on all 4 cylinders at the exhaust header. And all of them where the same temp. within a degree or so. It seams that if the #3 cyl. was not firing correctly the temperature would be cooler on that cyl.
MikeytheWiz likes this.
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Old 06 May 2012, 08:06 pm
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Default Re: head problem?

That's a first I heard of, compression fixing itself. Way to go! Miracles do happen I guess. Awesome!
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