Cold Start Idle

Tiny
JACKKUBAN
  • MEMBER
  • 1993 FORD AEROSTAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 89,000 MILES
1993 Aerostar doesn't fast idle on cold start. Idles fine after warm up. Starts with difficulty when below 32 degrees
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Tuesday, February 22nd, 2011 AT 2:50 PM

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Tiny
ERNEST CLARK
  • EXPERT
Should idle fast at cold start. The computer does this to quickly bring the engine up to temp. It should slowly drop the idle after a minute or so.

Hard starts during cold could be bad gas (use a bottle of HEAT), or a failing fuel pressure regulator. Check it with a fuel pressure gauge. Pressure should be 39-45 psi and hold for at leas 15 minutes after you shut down engine. If it doesn't, bad FPR
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Tuesday, February 22nd, 2011 AT 3:06 PM

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