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High Idle, Then Stalls and Rough Idle, Then Fine
Last weekend I was preparing for a Fri-Sun DE event at NJMP.
When driving my '99 Boxster around on Thursday afternoon, it was idling higher than normal: ~1200 rpm versus normally ~900. The night before it had sat out in some heavy rain - I have a hard top but the seal with the passenger window leaked enough to make the carpet on the passenger side pretty damp. When driving down to NJMP that evening, I had been going highway speeds for about an hour. I turned onto some local roads and at the first traffic light where I slowed to a stop, the car stalled. I restarted it right away and the idle was really rough, bouncing from ~600 rpm to ~1200 rpm. If I blipped the gas and kept it above ~1500 rpm it was fine and drove, but as soon as I had to brake for a stop light or sign (and couldn't blip the gas enough) the car stalled again. This repeated until it had stalled on me three times. I got to a place where I could park the car, and I let it sit with the ignition off for 5-10 minutes. After that short rest, I started the car again and everything was fixed. The idle was back to the normal ~900 rpm, the car no longer stalled, and for the remaining 2+ hours of my drive it was fine. I ran the car on the track for 3 days at the Drivers Ed event and it performed great. The question now is what caused this strange behavior last Thursday and is it worth investigating it further? I haven't been able to pull codes but there's no check engine light (or any other warning light). Could this have been the moisture causing a problem with some sensor and now that it dried up, the car is fine? Could it have been some bad gas that is now burned through? |
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09-14-2011, 09:44 AM
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Registered
Join Date: Jan 2004
Location: Northern Virginia
Posts: 3,347
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How was the carpet under the driver seat? this is where your computer sits. If it gets wet, wacky things can happen. No CEL makes it a little more curious.
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1970 914-6 Past: 2000 Boxster 2.7, 1987 944, 1987 924S 1978 911SC, 1976 914 2.0, 1970 914 w/2056 |
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09-14-2011, 12:09 PM
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The carpet under the drivers side was pretty dry, so besides general moisture in the cabin I think the dampness was only on the passenger side.
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09-14-2011, 12:25 PM
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Any ideas or should I just forget about this unless it happens again?
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09-17-2011, 09:06 AM
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