Rough cold idle October 01, 2005, 10:45:41 PM My 87 XR7 with the HO starts great, comes off high idle within 10 seconds and idles very choppy (like it has a big cam)and seems like it would like to stall until it warms up, then it idles pretty smooth. Is there likely a sensor gone bad or what? I just reset the idle speed and adjusted/checked the TPS. I have checked for vacuum leaks and checked for codes (nothing). Replaced my injectors with some from a friend with no change and installed new spark-plugs. It is just a cold idle problem that leads me to believe something electronic is not right(i.e. not telling the PCM that the car isn't warm yet). O2 sensors? ECT sensor? Suggestions?? Tests? :canada: Quote Selected
Re: Rough cold idle Reply #2 – October 02, 2005, 10:25:33 AM Check your ECT. Might be just enough out of spec to run py and not throw a code... Quote Selected
Re: Rough cold idle Reply #3 – October 02, 2005, 01:15:08 PM Have you ran codes?Sounds like it could be a map sensor,when mine went it wouldn't idle for . Quote Selected
Re: Rough cold idle Reply #4 – October 02, 2005, 03:36:19 PM Quote from: blakctMy 87 XR7 with the HO starts great, comes off high idle within 10 seconds and idles very choppy (like it has a big cam)and seems like it would like to stall until it warms up, then it idles pretty smooth. Is there likely a sensor gone bad or what? I just reset the idle speed and adjusted/checked the TPS. I have checked for vacuum leaks and checked for codes (nothing). Replaced my injectors with some from a friend with no change and installed new spark-plugs. It is just a cold idle problem that leads me to believe something electronic is not right(i.e. not telling the PCM that the car isn't warm yet). O2 sensors? ECT sensor? Suggestions?? Tests? :canada:ive had the same problem ever since i got mine ive changed every single sensor and nothin fixed it .YET ive learned to live with it let me know if you find what is wrong Quote Selected
Re: Rough cold idle Reply #5 – October 03, 2005, 05:39:35 PM I agree with Chuck, replace the ECT sensor... Quote Selected
Re: Rough cold idle Reply #6 – October 04, 2005, 09:36:38 AM Just tossing this out there because I am still learning diagnosing the 5.0 motor. But I took off and removed my Idle Air Controller this past weekend and hit it with some carb cleaner, and I was kinda shocked at all the junk that came out. Its takes 5 minutes to do and a little bit of peace of mind. But I can see why the ECT would be suspect. Quote Selected
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