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-   -   High Idle, Then Stalls and Rough Idle, Then Fine (http://forums.pelicanparts.com/boxster-cayman-forum/629742-high-idle-then-stalls-rough-idle-then-fine.html)

EPWilson 09-14-2011 09:44 AM

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?

racer 09-14-2011 12:09 PM

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.

EPWilson 09-14-2011 12:25 PM

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.

EPWilson 09-17-2011 09:06 AM

Any ideas or should I just forget about this unless it happens again?


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