Stalling when stopping at light

Tiny
STEVE MAC
  • 1989 FORD F-150
  • 413 MILES

Replaced tps, iac, map sensor runs rough at idle and stalls at lights. Has 4.9l wo ac checked all that I see. Have this truck along time and the only thing I think is a vacuum leak. No! Still has to be something electrical

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Thursday, May 16th, 2013 AT 3:24 PM

6 Replies

Tiny
ASEMASTER6371
  • EXPERT
  • 25,506 POSTS

Yes, vacuum leak.

Check the intake gasket very carefully. Common failure

Roy

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Thursday, May 16th, 2013 AT 4:35 PM
Tiny
STEVE MAC
  • MEMBER

Not at intake, checked that 3time seems to be getting too much vacuum at vacuum connector on the upper intake port where the map sensor is pluged in

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Thursday, May 16th, 2013 AT 5:07 PM
Tiny
STEVE MAC
  • MEMBER

There is a vacuum valve by the fuel pressure regulator 2port electric come from charcoal can splits and goes to both sides of throttle body by iac. Maybe it's bad?

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Thursday, May 16th, 2013 AT 5:10 PM
Tiny
ASEMASTER6371
  • EXPERT
  • 25,506 POSTS

If it leaks vacuum, yes.

Roy

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Thursday, May 16th, 2013 AT 5:12 PM
Tiny
STEVE MAC
  • MEMBER

What I think is the electric part of it is not letting the vacuum open. The way it seems to me is it works on throttle demand, all this started when my starter solenoid shorted out

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Thursday, May 16th, 2013 AT 5:26 PM
Tiny
STEVE MAC
  • MEMBER

Anything else you come up with?

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Thursday, May 16th, 2013 AT 5:42 PM

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