1997 Venture autoaccel problem

1997 ALL OTHER MAKES ALL OTHER MODELS
Avatar
FLASH
  • MEMBER
  • 2 POSTS
I have the following symtphoms.

My car sometimes autoaccelerates. What I mean by that is that it reaches by itself to even 60km or more without even having to push the acceleration.
Once this happen if I shift it from drive it will abruptly shake you (like somebody hit you from the back), and once put in parking the engine RPM goes skyroket (stupid car dosen't have a RPM gauge, but you can hear how the engine goes very high in turration) like I would be half the pedal to the ground. The thing is tho, that sometimes I have this problem, sometimes it's normal. Once I started the engine again in 10-20 seconds and it was normal.
All this started when I drove the car by accident with the handbrake on. (kinda stupid story)

What could the problem be? I just don't want to go to a mechanic to throw away some money again. I did that twice and I wish I didn't.

Highly appriciated, thank you
Feb 5, 2007 at 12:11 PM
Advertisement
Avatar
CHEVY22
  • CERTIFIED EXPERT
  • 1,375 POSTS
first thing i would check is the throttle plate to see if it is gummed up , this is a major problem for any car and will have the effect you are describing , if it id dirty clean it , get some throttle plate cleaner from any parts store and open the throttle by hand , spray it down and use a rag to wipe the body and plate until they are clean , this may not be the issue , but a good start

jim
Feb 16, 2007 at 7:16 AM
Avatar
FLASH
  • MEMBER
  • 2 POSTS
In case this might give additional clues.

The car autoaccelerates if you are driving downhill. if you arrive to a downhill and you just let it speed up, it will get the above problem. Ususaly to get rid of the problem, is once I put the gear into park I instantly shut the engine off (in the progress of the RPM going up).
Right now I am doing my best to avoid hills, and if I do get into a hill I just keep my break on to keep constant speed. I'm thinking of activating cruise control if i'm over 50. This dosen't happen on shallow hills, but on step ones, 15-20 degrees.
Feb 16, 2007 at 10:31 AM
Advertisement
Avatar
CHEVY22
  • CERTIFIED EXPERT
  • 1,375 POSTS
check the throttle plate for sticking , if its dirty it will do just what your saying , if you clean it and it does not fix the problem we will go from there ,

jim
Feb 16, 2007 at 4:19 PM