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1990 Toyota Corolla Keeps Blowing EFI Fuse when idling at o

Tiny
NORTHCAMAN
  • MEMBER
  • 1990 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • MANUAL
  • 14,000 MILES
I have a 2 door toyota Corolla SR5 front wheel drive with 4AFE engine. When I bring the car up to operating temp and let it sit and idle for a while, the car begins to run rough and then the engine dies. Sometimes it blows the 15 amp EFI fuse which is located under the hood near the drivers side fender. Sometimes it dies and doesn't blow the EFI fuse. If I replace the burned fuse it starts back up. The times it dies and doesn't blow the fuse, I just let it sit for about 10 minutes and it will start back up. I've tried switching the EFI relay with the headlight relay because they are the same parts and have the same part number. That does not make a difference. Does anyone have an idea what my problem is?
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Tuesday, August 18th, 2009 AT 6:48 PM

2 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi northcaman,

The EFI relay operates the fuel pump as well as few other items and swapping the relays indicates it is not a relay fault.

You would have to check/test the fuel pump and other wiring circuits to find the source of your problem.
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Wednesday, August 19th, 2009 AT 4:13 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
In addition to what KHL said:

Measure resistance across injector pins, should be 14-16 ohms, if resistance is low 2-4 ohms, then the injectors are bad.

And the pump could be drawing too many amps.
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Wednesday, August 19th, 2009 AT 8:48 AM

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