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Once again code 42 help.

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Old Jan 12, 2016 | 04:14 PM
  #1  
DemonYusuke's Avatar
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Car: 1991 z28 L98 Spec
Engine: 5.7 350 TPI 245\345
Transmission: 700 R4
Axle/Gears: 3.23
Once again code 42 help.

Okay guys I have been battling this issues for quite some time and it is getting very annoying. I have replaced everything to do with this code. It still refuses to go away. I have checked the wiring and the grounds and found nothing wrong. The car runs fine but feels sluggish (probably due to a bad injector). I have reseated the prom on the ecm I have tracked the white wire from D8 on the ecm and found nothing wrong.

99 times out of 100 the ses light is on, but every once in a blue moon, it goes away for like 10 minutes. (also note that my tachometer pegs at start up but will work every once in a while as well.)

Any advice guys, my next step is to replace the ecm or get a whole new harness. I really dont want to spend that kind of money for no real reason.

(ON another side note, i am dumping fuel, which i believe is my bad injector, but the car runs on all 8. Someone told me this is another sign of a bad ecm, but i just dont know.)
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Old Jan 12, 2016 | 08:02 PM
  #2  
antares57's Avatar
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From: Texas
Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Re: Once again code 42 help.

Follow the attachment and if that brings you to replace the ECM, replace it, Good luck.
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code42v8.pdf (462.5 KB, 180 views)
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