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?
Monday, July 20th, 2009 AT 3:00 PM

7 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
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.
Was this
answer
helpful?
Yes
No
Monday, July 20th, 2009 AT 5:29 PM
Tiny
JKOHL
  • MEMBER
  • 3 POSTS
[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?
Was this
answer
helpful?
Yes
No
Monday, July 20th, 2009 AT 5:55 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
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?
Was this
answer
helpful?
Yes
No
Monday, July 20th, 2009 AT 7:46 PM
Tiny
JKOHL
  • MEMBER
  • 3 POSTS
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
Was this
answer
helpful?
Yes
No
Monday, July 20th, 2009 AT 11:10 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
TPS voltage is .6V t0 4.80 V.

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


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



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



https://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.
Was this
answer
helpful?
Yes
No
Tuesday, July 21st, 2009 AT 5:29 AM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
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.
https://www.2carpros.com/how_to/how_to_tune_up.htm
Was this
answer
helpful?
Yes
No
Saturday, August 1st, 2009 AT 5:44 AM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
In an email, the member found the intake manifold leaking. The unmetered air was the vacuum leak.
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2009 AT 5:10 AM

Please login or register to post a reply.

Related Engine Idle Erratic Content

Vacuum Leak Test and Repair
VIDEO
Vacuum Leak Test and Repair
Instructional repair video
Idle High
GUIDE
Idle High
Intermittent sensor failure or shorting can cause the computer to act strange with unusual side effects, these problems are particularly tough to diagnose. The computer...
VIEW MORE