98 Mercury Cougar problem

Old 10-23-07, 07:49 PM
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98 Mercury Cougar problem

I am a mechanic that also does side work- I have a 98 Mercury Cougar that idles up and down in park. It has a 3.8 and automatic trans.
Old 10-24-07, 06:20 AM
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idles high and low

I have a dodge colt I bought for my daughter that is doing the same thing. Changed the O2 sensor and gave it a full tuneup includng cap and rotor. Still happening. I can disconnect the mass air flow sensor and it stops, although put in a new mass Air flow and it does the same thing.

I am now moving to other sensors and then the coil.

Can I ask if you notice a miss when driving, NOT under load? (or when you let of the gas?)

I will let you know If I figure it out
Old 10-24-07, 04:20 PM
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Clean out your IAC valve and TB (unless it's one of the ceramic ones that says on it "don't clean")

Check the voltage on the TPS

Any codes?

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