thats the easiest way 
Need possible diagnosis after H/C install ........
Thread Starter
TECH Apprentice
Joined: Dec 2001
Posts: 369
Likes: 0
From: Waldorf, Maryland
Need possible diagnosis after H/C install ........ On my drive home after completing H/C swap - my car started to act poorly (lose power, hesitate badly and surge). I pulled over and as soon as I stopped - the car stalled. I noticed that as soon as the car started acting funny - my Temp guage would go to "0" and stay there. RPM's would also jump slightly on their own. This happend 3 times in 15 miles (pulled over all 3 times) and would start right back up and everything would be normal.
This only happend 3 times on that day only and never again since the first drive home. I assumed the computer had learned everything and it wouldnt happen again.
Just last week however, I installed the Yella Terra rockers. I only mention them because this is the only thing I have touched on the engine since the H/C install save for a new TB several weeks ago. First drive after installing the YT's - the car acted funny again - temp guage went to zero and car hesitated and surged. I pulled over - it died. Then 30 seconds later it started right back up and drove normally. The following day - the same thing happend again except I wasnt driving. I had started the car up in the AM to let her warm up and after a few minutes I noticed the Temp Guage at "0" again. This time it took several starts to return to normal.
Any ideas? My car hasnt been tuned yet so that might be a culprit - all my fuses look good. I have reset the PCM and that hasnt seemed to help it.
Car runs fine 90% of the time - I just dont like that my temp guage shoots down to zero. The rough ride I could chalk up as a tuning issue - the temp guage I cant write off as easily.
Any ideas would be appreciated.
This only happend 3 times on that day only and never again since the first drive home. I assumed the computer had learned everything and it wouldnt happen again.
Just last week however, I installed the Yella Terra rockers. I only mention them because this is the only thing I have touched on the engine since the H/C install save for a new TB several weeks ago. First drive after installing the YT's - the car acted funny again - temp guage went to zero and car hesitated and surged. I pulled over - it died. Then 30 seconds later it started right back up and drove normally. The following day - the same thing happend again except I wasnt driving. I had started the car up in the AM to let her warm up and after a few minutes I noticed the Temp Guage at "0" again. This time it took several starts to return to normal.
Any ideas? My car hasnt been tuned yet so that might be a culprit - all my fuses look good. I have reset the PCM and that hasnt seemed to help it.
Car runs fine 90% of the time - I just dont like that my temp guage shoots down to zero. The rough ride I could chalk up as a tuning issue - the temp guage I cant write off as easily.
Any ideas would be appreciated.
Re: Need possible diagnosis after H/C install ........ Check the ground connections on the back of the heads, I have seen them get broken at the connector when people have tightened them.
Re: Need possible diagnosis after H/C install ........ Maybe the coolant temp sensor is damaged or the wiring is damaged, I would check that first, its located on the front of the driver side head, right in front of the front most header bolt. (You would have had to swap this from one head to another when you did the swap) Good luck, let us know, Shawn
PS: This is just a guess, something to look at, hopefully someone with some more knowledge will chime in......
PS: This is just a guess, something to look at, hopefully someone with some more knowledge will chime in......
Thread Starter
TECH Apprentice
Joined: Dec 2001
Posts: 369
Likes: 0
From: Waldorf, Maryland
Re: Need possible diagnosis after H/C install ........ I dont think it was the CTS - it was new cause I think I shipped the original one along with my stock heads to some lucky gentleman. I wiggled the wire when the temp guage was showing "0" and nothing changed so I think that is good.
As for the ground connection - is there any other symptoms I would be having that would help pinpoint this as a cause? Whats the easiest way to check if this is the problem?
As for the ground connection - is there any other symptoms I would be having that would help pinpoint this as a cause? Whats the easiest way to check if this is the problem?
Re: Need possible diagnosis after H/C install ........ My CTS broke when i did my H/C install. I rigged it up to stay on the prongs for a bit, but then started slipping, when it would slip off, the car would studder and stall, just like you describe. Maybe it is going bad or a wire is fried somewhere?
-Steve
-Steve
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