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502 mpi no inj. pulse

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Old 06-08-2011, 02:32 PM
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Default 502 mpi no inj. pulse

My bud has a early 502 mpi. no inj pulse. I swapped the ECU and module still no pulse. Man these early mefe-1's where freekn junk!

Other than a broke wire any other ideas?
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Old 06-08-2011, 07:05 PM
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Mine was doing the same thing after sitting. Found out that the injectors were stuck shut. Got them loose but pulled them to be cleaned anyways. Got to love the quality ethanol gas we have now!
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Old 06-08-2011, 07:22 PM
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No there is no pulse. Pulled the injector wire of and installed a noid light in the conecter that goes to the injector and it doesnt light up . No juice.
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Old 06-08-2011, 08:05 PM
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Does it have voltage on the red wire to the injectors? ? Does it have spark?
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Old 06-08-2011, 09:27 PM
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yes spark no power to the inj.
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Old 06-08-2011, 09:42 PM
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In the injection box there are 3 fuses, 1 for the fuel pump, one for the ECM, and one for the injectors, you are looking for the one with a red and a pink/blk wire to it. But I would check them all.
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Old 06-08-2011, 10:03 PM
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Originally Posted by Ted G View Post
In the injection box there are 3 fuses, 1 for the fuel pump, one for the ECM, and one for the injectors, you are looking for the one with a red and a pink/blk wire to it. But I would check them all.
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check the wire at the injector with a dvom for power,if you dont have a - switching pulse then suspect the pick up coil in the dist..
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