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RPM moves up and down when letting go of gas.

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Old 02-24-2011, 11:36 AM
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RPM moves up and down when letting go of gas.
Ok, when I am driving my RPM looks fine. When I let go of the gas it starts dropping down and when it hits 1K itll jump up to about 1.2 or 1.3K and then drop to normal idle. What is causing this?
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Old 02-24-2011, 11:54 AM
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maybe vacum leak?
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Old 02-24-2011, 12:05 PM
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But it doesnt drop down below average idle?
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Old 02-24-2011, 12:09 PM
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TPS Sensor
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Old 02-24-2011, 12:09 PM
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Originally Posted by 97BlackAckCL
TPS Sensor
I thought the same exact thing. Is there anyway of testing it for sure?
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Old 02-24-2011, 01:13 PM
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Not really, you could try cleaning it, but this is 9 out of 10 times what it is
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Old 02-24-2011, 01:34 PM
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Thanks man.
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Old 02-24-2011, 07:59 PM
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mine has always done this...never knew what it was but didnt really care bc it doesnt really bother me....maybe ill clean mine this weekend
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Old 02-24-2011, 08:34 PM
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IACV

try cleaning that. thats a typical culprit
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Old 02-25-2011, 05:29 AM
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Originally Posted by SupraManAG
IACV

try cleaning that. thats a typical culprit
I was thinking that too, def have seen the IACV cause this before
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Old 02-25-2011, 08:27 AM
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Originally Posted by SupraManAG
IACV

try cleaning that. thats a typical culprit
This is the other one I was trying to remember, had a rough day yesterday. Definitely this or the TPS
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Old 02-25-2011, 12:33 PM
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Hell yeah, thanks guys. Where is the IACV located on my 2.3?
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Old 02-25-2011, 03:57 PM
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Old 02-25-2011, 08:58 PM
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theres 2 bolts to get it off...and i think a few hoses...all very accessible
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Old 02-26-2011, 06:21 PM
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if your still wondering about this problem...i just cleaned my IACV and no more bounce after i let off the throttle
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Old 03-07-2011, 03:48 PM
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Clogged EGR?
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Old 03-07-2011, 10:50 PM
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Originally Posted by cwindsor
Clogged EGR?
nah...not for me atleast...i know because i cleaned the hell outa my egr system and seafoamed about 5000 miles ago and it behaved the same even after that. the IACV cleaning cleared it right up
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