1994 Chevy Cavalier

Tiny
JKOHL
  • MEMBER
  • 1994 CHEVROLET CAVALIER
1994 Chevy Cavalier 4 cyl Front Wheel Drive Automatic

my car is revving very high like the thorttle is stuck and then it will start to idle up and down with the check engine light on replaceed the map sensor and thorttle postiosn sensor still didnt fix it?
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Monday, July 20th, 2009 AT 3:00 PM

7 Replies

Tiny
SERVICE WRITER
  • EXPERT
What codes are showing now?

Are you in an area that the temperture reaches freezing?

THe pcm had been a problem due to the location on these. Water would enter it and crack the case.
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Monday, July 20th, 2009 AT 5:29 PM
Tiny
JKOHL
  • MEMBER
[quote="jkohl"]1994 Chevy Cavalier 4 cyl Front Wheel Drive Automatic

i live in the valley of oregon so doesnt get to cold here the local parts store scanner said low map pressure?
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Monday, July 20th, 2009 AT 5:55 PM
Tiny
SERVICE WRITER
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HAve you checked for an intake leak? Using carb cleaner spray around the intake gasket area and see if the idle changes.

HAs there been any work done to this just prior to this problem? In particular has the egr been removed at all?
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Monday, July 20th, 2009 AT 7:46 PM
Tiny
JKOHL
  • MEMBER
No worl was done prior to this it just started doing it yesterday it was weird thinking may iac sensor tryed to find a book on it but the local store has none in stock so I could test the map tps sensors for ohms to see if they are bad
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Monday, July 20th, 2009 AT 11:10 PM
Tiny
SERVICE WRITER
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TPS voltage is .6V t0 4.80 V.

I don't know what code number you have so I assume it is this:


http://www.2carpros.com/forum/automotive_pictures/30961_acav3_1.jpg



http://www.2carpros.com/forum/automotive_pictures/30961_acav1_1.jpg



http://www.2carpros.com/forum/automotive_pictures/30961_acav2_1.jpg



If this is the right code and you can't read this, send me an email.
Pukenstein@aol.com
and I'll send it.
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Tuesday, July 21st, 2009 AT 5:29 AM
Tiny
SERVICE WRITER
  • EXPERT
The two things I would focus on at this point...actually 3.

1-Be sure the wires and connections are good at the iac, map and pcm. Be sure the harnesses have not been damaged through heat or oil and no corrosion exists.

2-be sure there are no vauum leaks. At the manifold and all rubber goods. Look for any dry rotted, collapsed or opened up lines.

3- Clean the throttle bore with a good cleaner. May need to pick up a bottle brush to aid in this.
http://www.2carpros.com/how_to/how_to_tune_up.htm
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Saturday, August 1st, 2009 AT 5:44 AM
Tiny
SERVICE WRITER
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In an email, the member found the intake manifold leaking. The unmetered air was the vacuum leak.
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Tuesday, August 4th, 2009 AT 5:10 AM

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