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Old 08-25-2012, 08:10   #1 (permalink)
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Surging on deceleration

Hi all,
My 2002 w/5-speed has a curious RPM trait when decelerating or coasting down in gear with the clutch engaged. Seems it has 2 levels of compression braking; Hi & Low. I'll try to explain it in an understandable manner below:

When removing my foot from the accelerator pedal, compression braking will start dropping speed at one level then shift to a more noticable level then go back to the less severe level. I'd sure like to get the more severe level on a regular basis. This happens in all gears.

It almost seems like the throttle will hang at a higher RPM & then drop to a lower RPM & then repeat the cycle. Is there an electric 'dash-pot' idle control arrangement on the injector system that I could disconnect?

Any ideas/thoughts?
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Old 08-25-2012, 09:17   #2 (permalink)
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Re: Surging on deceleration

It may be the IAC sticking. Try cleaning it to see how it does.
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Old 08-25-2012, 13:34   #3 (permalink)
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Re: Surging on deceleration

Thanks for the reply.
But I need further clarification - what is the IAC & where is it?
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Old 08-25-2012, 14:34   #4 (permalink)
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Re: Surging on deceleration

It's the idle air controller. Depends on what engine it is. This may help. Where is the idle air control valve (iac) on a 2000 mercury cougar? - Yahoo! Answers
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Old 08-25-2012, 16:19   #5 (permalink)
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Re: Surging on deceleration

Thanks, Bert.
Got it now and will do as suggested.
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