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Help some minor problems with my Formula.

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Old Jan 27, 2008 | 08:51 AM
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Default Help some minor problems with my Formula.

I been having some problems lately. When I come to a stop, it seems like the car wants to die, it's like the idle drops really low before jumping back up to 500rpms. Sometimes I have to keep by foot both on the gas and brake to keep the idle from going to low.

And I don't know if this is connected to the problem above, but when I'm at a stop and push the gas pedal, it hesitates for a split second before the car actually responds.
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Old Jan 27, 2008 | 10:43 AM
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I would start by doing a tune up.
Plugs, wires, fuel filter, air filter, etc...

The low idle problem could be because of the IAC. (idle air control valve).
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Old Jan 27, 2008 | 11:00 AM
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i would think its your throttle position sensor
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Old Jan 28, 2008 | 09:26 AM
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Anyone else? How can I check the TPS and IAC while the car is in the driveway before I start blowing money?
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Old Jan 28, 2008 | 10:18 AM
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I would clean your IAC motor (as best as you can), Throttle body and MAF sensor with an intake cleaner. $5 bucks and a little of your time just might fix your problem! G/L!
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Old Jan 28, 2008 | 10:31 AM
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Thanks.

I did some searching and I'm pretty sure I have a vacuum leak. When I'm driving I think I hear something coming from the engine, I'm not sure if that is the vacuum leak itself, or the belts.

But when I turn off the car, I hear this big rush of air that comes from the engine. It's like a big hiss..
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Old Jan 28, 2008 | 01:50 PM
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Originally Posted by autotrix
I would clean your IAC motor (as best as you can), Throttle body and MAF sensor with an intake cleaner. $5 bucks and a little of your time just might fix your problem! G/L!

I agree w/ autotrix. Clean the IAC motor. Had this problem w/ my Dodge Spirit. Cleaned it w/ AC Delco X66 carb cleaner. Car ran fine after that. The plunger was getting stuck from the dirt buildup.

Last edited by BlackDuk98; Jan 28, 2008 at 03:00 PM.
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