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When I apply the idle drops out and the car acts like it is going to die

Tiny
JONESCBR
  • MEMBER
  • 1997 SATURN SC2
  • 148,838 MILES
I have a 97 saturn sc2 that when I apply the brakes the idle drops out and almost makes the car die. I have replaced the plugs and coolant temp sensor and cleaned the throttle body. Any ideas what this could be
Saturday, December 10th, 2011 AT 7:06 PM

3 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So idles fine till you step on the brake then idle drops and gets unstable?I have seen colasped brake booster vacuum hoses do that so inspect that hose. ALso I have seen leaky brake boosters do that as well. It only does this at idle when steping on the brake not while driving?
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Saturday, December 10th, 2011 AT 7:12 PM
Tiny
JONESCBR
  • MEMBER
  • 2 POSTS
Yeah mostly then. It idles at about 900 or so when just sitting in park or neautral. Could the coolant temp sensor connector be causing it
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Saturday, December 10th, 2011 AT 8:10 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Was the coolant temp sensor connector terminals green or blue instead of silver?If so your going to have to replace the connector that skews the actual temp readings. Did you check the other things I mentioned to you?
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Saturday, December 10th, 2011 AT 11:18 PM

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