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Engine revs by itself (1/6)
 12/30/18 11:58am
DanC4-90
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Glen Cove, NY - USA

Vette(s):
1990 white with red interior


Joined: 10/4/2014
Posts: 3

First, when I start her up, I always let the engine warm up for a few minutes. When driving and getting over 40mph, the engine revs and drops, revs and drops. My foot is steady on the gas pedal. The revs are maybe 100rpm, nothing to make the car accelerate. After a few minutes of this, she levels out and runs steady. Anybody experience anything like this? Also, she runs really hot if I get stuck in traffic. I rigged up a way to vacuum the radiator and cleaned out the stuff that got sucked into the shroud. If I am moving, the temp is fine. Thanks!
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Re: Engine revs by itself (2/6)
 1/6/19 11:59am
rtslt4
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Huntington Station, NY - USA

Vette(s):
1996 Black Cpe., Lt. Beige Int., LT4, 6 Spd., Corsa Exh., K & N, & Chrome Replc. Wheels.


Joined: 7/2/2013
Posts: 48

Which transmission does your car have?

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Rts-LT4
Re: Engine revs by itself (3/6)
 1/10/19 8:06pm
Superc63
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Franklinville, NJ - USA

Vette(s):
1988 35th Anniversary 1993 Z07 40th Anniversary


Joined: 7/6/2018
Posts: 12

Hunting RPM sounds like it could be vacuum related, maybe a small leak someplace. Its also possible the throttle position sensor is dirty causing some low rpm fluctuation. Overheating...how hot is it running? The colling fan switch doesnt turn on until coolant temp of around 230. Chris
Re: Engine revs by itself (4/6)
 1/23/19 9:28pm
DanC4-90
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Glen Cove, NY - USA

Vette(s):
1990 white with red interior


Joined: 10/4/2014
Posts: 3

Stock automatic
Re: Engine revs by itself (5/6)
 1/23/19 9:29pm
DanC4-90
Standard Member
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Glen Cove, NY - USA

Vette(s):
1990 white with red interior


Joined: 10/4/2014
Posts: 3

Almost decks the needle so I have to pull over and stop. Thanks
Re: Engine revs by itself (6/6)
 1/24/19 1:39pm
rtslt4
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Huntington Station, NY - USA

Vette(s):
1996 Black Cpe., Lt. Beige Int., LT4, 6 Spd., Corsa Exh., K & N, & Chrome Replc. Wheels.


Joined: 7/2/2013
Posts: 48

When you say "almost decks the needle", I assume you mean the engine revs up to almost the red line?  If so, it sounds like the symptoms you originally described have changed and/or getting worse.  Correct?  What happens after you "have to pull over and stop"?  How many miles are on the car?

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Rts-LT4