Car Revs to 2000 rpm for no reason

[Jay123]

okay i just got my 97 eclipse gsx and so far ive got a new timing belt some valves replaced and soon to get a fuel pump but i noticed when i start my car is revs like all cars do to like 2000 rpm but then it'll go down like normal......then it will keep reving to 2000rpm then slowly go down the rev back up ???? ????

 

[Twizzle]

idle surge. most likely need a new ISC.

 

[Rick4g63]

Twizzle is correct..... sounds like the ISC is shot to hell.
I will not pay more than $150 for a new one from satan (mitsubishi dealer).

 

[JATBarandgrill]

well, my car does this when my gas is getting low. I dont know if thats true on all the dsm's though.

 

[Rick4g63]

Have the TB been cleaned? Goo and Gunk will cause erratic idling also.

 

[DSMBOY123]

I dont know, but did you make sure all the vacuum lines are in check?

 

[Rick4g63]

Jay, click on the site belw and you can see what the ISC motor looks Like:

http://www.machv.com/1gdsmidspcom.html

For the 1G:

http://www.machv.com/1gdsmidspsw.html


To test the ISC:

http://www.geocities.com/MotorCity/Downs/7678/dsmtests.html

 

[Jay123]

preciate it......but i dont know hardely anything bout engine parts but ill figure it out

 

[neuralracing]

I have this same problem... my car had a massive overheat and I had to have the Head shaved and replace the studs and Gasket. I replaced with a Cometic Gasket, ARP Studs and at the same time I removed my Cruise Control.

What should I be checking? Someone mentioned that maybe I didn't connect one of the VAC lines correctly?