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2000 rpm???

Having two issues. The most recent one for the last few months: When I come off the throttle, the RPMs drop to 2000 RPM with clutch in and throttle closed. If I tap the throttle, the RPMs drop back down to idle. Does this almost constantly. Mechanic has had the engine out and verified all good from the transmission back.

The other problem is one I've had for a few years but only when the engine is warmed up a bit: I get a fluctuating RPM of +/-200 rpm at idle when warm. Doesn't do it all the time, just after the car has warmed up.

Any thoughts? vacuum line? Is there a throttle position sensor? I have replaced the DME relay. Spark plug wires are only a few years old and rotor/distributor are new as well as the coil.

Thanks...

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2002 GMC Yukon SLE - 4AT - Purchased New in 2002
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Old 11-20-2016, 10:16 AM
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It only happens when the engine has warmed up correct?
It wasn't the same exact problem that I had but my idle did search like yours did. I had an intake gasket leak. Could the problem show up due to engine expansion causing a leak? It may be hard to check on a cold engine.

The high RPM problem could be due to a binding of the throttle and/or cable.
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Old 11-20-2016, 11:15 AM
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Have your mechanic check the idle switch, sometimes those get sticky or fail but that is rare. You can soak it with electronics parts cleaner and work it to break up any hard deposits.

+1, idle hunting when warm is most likely a vacuum leak. Do you know when he engine was rebuilt?

Also, try removing the IDLE CONTROL VALVE and have it cleaned out using non-residue Carb Cleaner until the fluid comes out clear then spritz with silicon based lube, very little though.
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Last edited by DRACO A5OG; 11-20-2016 at 08:12 PM..
Old 11-20-2016, 03:13 PM
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I had the 2000 rpm issue and lubricating the throttle pivot point on the side of gear box eliminated the problem.
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Old 11-20-2016, 05:51 PM
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Quote:
Originally Posted by 86911cab View Post
It only happens when the engine has warmed up correct?
It wasn't the same exact problem that I had but my idle did search like yours did. I had an intake gasket leak. Could the problem show up due to engine expansion causing a leak? It may be hard to check on a cold engine.

The high RPM problem could be due to a binding of the throttle and/or cable.
Yes, warm...I'll check the intake gasket. Thanks!
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2002 GMC Yukon SLE - 4AT - Purchased New in 2002
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2019 Macan S - 7PDK - Euro Delivery July 2019
Old 11-20-2016, 08:47 PM
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Quote:
Originally Posted by DRACO A5OG View Post
Have your mechanic check the idle switch, sometimes those get sticky or fail but that is rare. You can soak it with electronics parts cleaner and work it to break up any hard deposits.

+1, idle hunting when warm is most likely a vacuum leak. Do you know when he engine was rebuilt?

Also, try removing the IDLE CONTROL VALVE and have it cleaned out using non-residue Carb Cleaner until the fluid comes out clear then spritz with silicon based lube, very little though.
Next step was going to be replacing the ICV. Will also check the idle switch. RE-build was about 5 years ago...
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2002 GMC Yukon SLE - 4AT - Purchased New in 2002
1988 911 Cab - 5MT - Purchased in 2005
2008 Cayman - 5MT - Purchased New in 2007
2014 911/50 - #1173 - 7MT - Purchased CPO in 2014
2019 Macan S - 7PDK - Euro Delivery July 2019
Old 11-20-2016, 08:48 PM
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Quote:
Originally Posted by jcgranato View Post
I had the 2000 rpm issue and lubricating the throttle pivot point on the side of gear box eliminated the problem.
thanks...will check that as well
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2008 Cayman - 5MT - Purchased New in 2007
2014 911/50 - #1173 - 7MT - Purchased CPO in 2014
2019 Macan S - 7PDK - Euro Delivery July 2019
Old 11-20-2016, 08:49 PM
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Quote:
Originally Posted by pavegeno View Post
Next step was going to be replacing the ICV. Will also check the idle switch. RE-build was about 5 years ago...
No need to replace the ICV if it ohms out correctly, just service it.

5 years ago eh, well then definitely check the intakes, they may have come loose or sucked in the gaskets causing a vacuum leak.

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Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace
PCA/POC
Old 11-21-2016, 05:00 PM
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