why is my car idling too low and sometimes stalling when I stop - TCCoA Forums
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post #1 of 3 (permalink) Old 09-03-2003, 12:55 PM Thread Starter
Join Date: Nov 2002
Posts: 26
why is my car idling too low and sometimes stalling when I stop

I have a question I hope someone can help with. Just recently my 95 SC 5-speed with 102K miles developed a problem. When I stop at lights or other places, the RPM need drops way down below 500rpm and the car sometimes just dies which can cause problems because obvioisly I lose the sterring. It does not idle rough at all. It idles at around 900-1000 rpm when the car is sitting still. Just happens when I shift down then put it in neutral and let it coast up to the light. The car just wants to quit and I have to start it back up quickly then it runs fine. Can it be a fuel pump or vacumn problem? Thank you for any help.

What it does is that between 1st and 2nd gear and 1st and neutral: when I depress the clutch the rpm's drop to around 500. I think they should be higher. When rolling to a stop, the car will sometimes just idle way too low and quit, so I have to restart it. My speedometer stopped working at the same time this problem started. I have already ordered a new speedometer head. Any relation in the two problems.
rolltide is offline  
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post #2 of 3 (permalink) Old 09-03-2003, 01:32 PM
4th Gear Poster
Join Date: Nov 2002
Location: Alberta, Canada
Posts: 324

Give the IAC valve (Idle Air Control) also known as a Throttle bypass valve a good
cleaning with some electrical contact cleaner. Its attached to the throttle body with
two bolts and has two wires going to it. Its kinda shaped like a large D-cell silver
battery with a diamond shaped bass.

Hope this helps

ChrisW01 is offline  
post #3 of 3 (permalink) Old 09-04-2003, 02:23 AM
Join Date: Jul 2002
Posts: 204
The most common reason is unmetered air getting into the system so check to make sure the PCV lines are fully connected. Especially the one that goes from the intake hose to the drivers valve cover. It usually routes under the fuel lines, harness, SC snout, and other things and its not one piece and easily comes loose just by changing the air filter. Mine would idle fine if I had the AC or Defroster On, which increases the idle speed to keep it from dying. It could also be the back one, but check the front first b/c its more common. Good luck
vancouverBC is offline  

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