*** Restricting New Posts to SD Premium Members ONLY *** (09 May 2025)

Just made a new account? Can't post? Click above.

Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

1997 4.3 s10 IAC valve operation at startup

  • BrunoPecego
  • BrunoPecego's Avatar Topic Author
  • Offline
  • Junior Member
  • Junior Member
More
1 year 9 months ago #63730 by BrunoPecego
1997 4.3 s10 IAC valve operation at startup was created by BrunoPecego
cold engine startup key on engine off I found that my IAC valve closes instead of opening. it starts on very low rpm and shaking a lot and then it seems to open for more air flow so rpm raises slowly until about 1000 and then drops to 700 faster then it should.

is this more related to the IAC system itself or MAP sensor is suspect? the IAC is supposed to open for more air on startup right?

why is it closing instead of opening?

Please Log in or Create an account to join the conversation.

Time to create page: 0.341 seconds