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1999 Mitsubishi Eclipse Car keeps shutting off

Tiny
KRYPTECLIPSE
  • MEMBER
  • 1999 MITSUBISHI ECLIPSE
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
I have just installed a new ecu and did a complete engine overhaul. Car shuts off on me sometimes when in idle. My mechanic says it is the ecu, but everything is new. Says there is no power in the pin number 89 in the ecu. I have tested fuel pressure and it is fine. There are no codes. When it shuts off it sounds like if the car is choking. It doesn't shut off if you accelerate it and get the rpms up.
Any help is appreciated
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Monday, November 30th, 2015 AT 6:00 PM

4 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,742 POSTS
How much have you driven the car since you reconnected the battery? It sounds like "minimum throttle" hasn't been relearned yet. To meet the conditions for that to occur, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.
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Monday, November 30th, 2015 AT 6:30 PM
Tiny
KRYPTECLIPSE
  • MEMBER
  • 45 POSTS
I have driven it about 200 miles
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Monday, November 30th, 2015 AT 7:24 PM
Tiny
KRYPTECLIPSE
  • MEMBER
  • 45 POSTS
Did what you told me and it is still doing it. The mechanic checked and he says that he is getting a bad reading in the crankshaft sensor but he changed it Any suggestions
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Tuesday, December 1st, 2015 AT 1:22 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,742 POSTS
What does "bad reading" mean? The engine won't run if that sensor isn't working.

If coasting for seven seconds didn't solve this, do it again while holding the brake pedal up with your toes. Sometimes the pedal will vibrate, and if one part of the brake light switch turns on momentarily, the relearn will be aborted.

The next step is for your mechanic to use his scanner to test the idle speed motor function. That will allow him to run the idle speed up to 2000 rpm in 200 rpm increments. That will prove the system is working and the air passage isn't blocked with carbon. If the idle speed doesn't increase or if the scanner says the test "isn't allowed", that is because minimum throttle hasn't been relearned yet.
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Wednesday, December 2nd, 2015 AT 2:37 PM

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