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98 Cobra High Idle Problem

Old 04-23-2008, 08:13 AM
Thread Starter
Join Date: Apr 2008
Posts: 1
Default 98 Cobra High Idle Problem

I've got a bone stock 98 Cobra with 36k miles. After driving in traffic for a period of time, it will idle at 1200-1600RPM's. If you shut it off and instantly restart it, it will idle normally for a while. It doesn't do this every day and *seems* to happen more oftenwhen it's warmer and more humid outside (NE Ohio conditions) or if I take off and have the engine speed lower than where it might idle at.

Also sometimes right before it acts up, the idle speed will start wandering from about 800 RPMs to 1200RPMS beforegoingto the high idle. No check engine light. Other than that, the car runs totally fine. Is this a bad Idle Air Solenoid?

Thanks in advance!
Paul_B is offline  
Old 04-27-2008, 10:24 PM
2nd Gear Member
Join Date: Mar 2008
Location: Ohio
Posts: 362
Default RE: 98 Cobra High Idle Problem

i hav a 97 cobra and i live in ohio(weirdest weather pattern in America) but it sounds like it could need a Throttle Postion Sensor.
pitmitch910 is offline  
Old 04-30-2008, 04:57 PM
Join Date: Jul 2007
Posts: 3
Default RE: 98 Cobra High Idle Problem

Had the same issue with my '01. TPS did the trick. It is easy to replace yourself.
slithersvt is offline  
Old 01-30-2019, 09:10 AM
Join Date: Aug 2012
Location: tx
Posts: 1
Default Similar isle issue

I have a 1996 cobra I bought. The owner I bought her from took the intake off and was going to add a supercharger but didnít finish his projec. When I purchased it it had no intake and the modified imrc with the butterflies removed. I purchased an intake and put it back to stock. Issue is it will start and run but the idle will not drop below 1400 and usually sticks from 1400 to around 16 to 1800. Thought it has a bad tos or throttle body so I purchased another and still have the same issue. Did anyone every flags this issue ???
stanger19899ddr is offline  
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