Rough Idle on hot starts

287,400 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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TEESURRATT
  • MEMBER
  • 17 POSTS
Recently I've been having a problem where the car won't run on hot starts (the car starts and immediately shuts off). I've solved this by topping off the coolant and replacing the thermostat housing mounted fan switch. Now when I start the car after its been driven and parked for 15-30 minutes it starts to idle at 1,000 and then it drops and hovers around 600 rpm's. I've been recommended the main relay and fuel injector cleaners, but I've ran the injector cleaners and under inspection, the main relay looked fine. The car only does this on hot starts. On cold starts, it runs smoothly at 1,000 rpm.
Apr 29, 2020 at 4:09 AM
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DANNY L
  • ✓Experienced Mechanic
  • 5,648 POSTS
Hello, I'm Danny.

Here is something to try.It sounds like you might be having trouble with the intake air bypass valve. I've attached picture steps below on how to test.Hope this helps and thanks for using 2CarPros.
Apr 29, 2020 at 5:12 AM
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