Problem: - Car starts and runs fine when cold...after idling for several minutes the car warms up and starts running like crap (feels like the timing is way off) until it dies and won't restart. After the car cools down I can do it all over again.
Things I've already checked: - ECM Replaced (I have a spare from same year/ make/ model) No change. - Coolant Temp Sensor replaced. No change - IAT Sensor bypassed. No change - Originally I thought it was a fuel problem. However the car has a new pump, and pump relay and the filter is clean.
It seems like a temp sensitive timing problem. Any thoughts?
#119802, "RE: Help? Timing off when car warms up" In response to Reply # 2
Can you verify the timing is actually adjusting via a datalogger?
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#119803, "RE: Help? Timing off when car warms up" In response to Reply # 4 Mar-12-07 05:55 AM by arsenaultal
I thought about the Cam Sensor, but wouldn't it screw it up all the time and not just when its warm?
I don't have access to a data logger. I'm not for sure its the timing but it sure sounds like it.
It idles and revs just fine when cold, but as soon as the temp guage starts moving it starts running worse. I have to rev it to keep it running and then it gets so bad it won't run at all.
I unpluged the IAC sensor (center back side of Intake) but what is the IAC on the Throttle Body? Could this be affecting it? I didn't think it was temp dependent.
#119805, "RE: Help? Timing off when car warms up" In response to Reply # 6 Mar-12-07 10:07 AM by arsenaultal
Yeah, I ment to type IAT.
Ok, I took off the TB and cleaned it with brake cleaner. I read some threads where people had trouble with the IAC getting gummed up and not idiling properly.
Update: Now it won't start at all. It cranks and spits, sputters, and backfires but won't run. Still sounds like timing is off but now it won't run even cold.
#119807, "RE: Help? Timing off when car warms up" In response to Reply # 8
Did you recently change the timing belt? It sounds like when my cam sprocket dowel pin sheared off, I haden't used any loctite when I put in my sprocket bolt and after a few hundred miles it backed out just enough that the pin sheared, it started great for a while then the ecu kept pulling timing as it warmed and eventually wouldnt start once the pin fully sheared, luckily it didn't damage anything, it just stopped spinning just out of the way of everything, but it backfired like a mother until I saw the gear wasn't spinning and stopped. I was lucky I had an extra exhaust cam
#119808, "RE: Help? Timing off when car warms up" In response to Reply # 9 Mar-12-07 03:32 PM by IowaRS_racer
Same exact problem here, also sporting the p1390 code. Is the code related? I haven't messed with anything related to the timing belt. Ive also replaced the cam sensor, coolant temp sensor, IAT sensor, PCV etc. .... will you get a 1390 code if the crank pos sensor has taken a crap? Belt has plenty of tension, and is in great shape(no cracks/ splits etc.)I find it hard to believe that its slipped a tooth or more, w/o me messing with it?!?! Could it be related to the EGR block-off??