Issue with idle: RPM drops and surges, sometimes stalls. How do I diagnose?
12-30-2008, 12:55 PM
#31
Race Car
I have had varying results with chips. I don't think I am the only one. Autothority told me that a particular chip will work for one guy and not another. Climate and regional fuel differences make it difficult to get consistant performance. I have used chips in 944 turbos that worked flawlessly. Again in my experience, cold start problems and a lumpy idle are the most common problems with chips. I am a luke warm on chips, others swear by them.
04-27-2009, 09:02 PM
#32
Instructor
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Join Date: Mar 2006
Location: Raleigh, NC
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Update on my idle issue:
As posted previously, I removed and cleaned the ICV, but that didn't help. I had the mechanic check my full throttle microswitch and the fuel pressure regulator. They were both fine. The mechanic witnessed the behavior and thought it was a rich mixture problem.
So, the other weekend I took off the MAF and cleaned the hotwire tube using some "MAF sensor" cleaner spray I found at NAPA. NOTE: this is different than carb/choke cleaner or throttle body cleaner. It is specifically for the MAF sensor. Anyway, I put 10-15 sprays of that stuff down the tube and let it dry out. Then I re-oiled the filter and re-assembled. The idle is much better! I need to drive it some more before I declare total victory, but the first 20 or so miles have exhibited no idle problems.
As posted previously, I removed and cleaned the ICV, but that didn't help. I had the mechanic check my full throttle microswitch and the fuel pressure regulator. They were both fine. The mechanic witnessed the behavior and thought it was a rich mixture problem.
So, the other weekend I took off the MAF and cleaned the hotwire tube using some "MAF sensor" cleaner spray I found at NAPA. NOTE: this is different than carb/choke cleaner or throttle body cleaner. It is specifically for the MAF sensor. Anyway, I put 10-15 sprays of that stuff down the tube and let it dry out. Then I re-oiled the filter and re-assembled. The idle is much better! I need to drive it some more before I declare total victory, but the first 20 or so miles have exhibited no idle problems.
