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New problem with idle
Posted by 95Guy [Email] (more from 95Guy) on Mon, 2 Aug 2010 14:20:23
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2004 Auto 95 ARC 50,000 miles.
I have searched but haven't been able to find a solution.
I was having problems with rough idle, rpm dip, and stalling, but no CEL. Perhaps coincidentally I then had a crank but no start, which mechanic contributed to failed DIC, the second in a year. I also replaced CPS just for the hell of it. (What would be the symptoms of a CPS that wasn't seated properly?)
After picking the car up, it ran great for a day, then the rpm jumping and some surging returned. The car has not stalled though. When in park, the car dips to below 1000 rpm as if it were going to stall, then jumps back to 1100 or so. It does this repeatedly and consistently. It is a consistent rhythmic occurrence every second or so like a metronome.
My car might need an air filter and fuel filter, but I am completely out of ideas. Vacuum hoses appear to be in decent shape. No visible smoke. No CEL. TB has been cleaned. I've been using 91 octane and recently used a techron type treatment.
I would appreciate ANY ideas or similar experiences.
What problems don't throw codes? Wouldn't TB electronics glitching throw a code? O2 Sensor would too, right? Bad air flow?
Broken valve? Clogged Cat? Fuel pressure?
Thanks.
posted by 76.170.96...
Posts in this Thread:
- New problem with idle, 95Guy, Mon, 2 Aug 2010 14:20:23 <-- Viewing This Message
- Re: New problem with idle, CY, Tue, 3 Aug 2010 12:03:16
- replace the throttle body n/m, jimmy, Tue, 3 Aug 2010 08:09:30
- Re: New problem with idle, Mike, Tue, 3 Aug 2010 07:25:30
- Re: New problem with idle, dtech, Mon, 2 Aug 2010 17:13:46
- Re: New problem with idle, Dean, Mon, 2 Aug 2010 15:35:30
- Clarification, 95Guy, Mon, 2 Aug 2010 14:26:21
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