1992 Other Chevrolet Models fuel delivery problem

1992 CHEVROLET

197,000 MILES • V8 • 4WD • AUTOMATIC

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I have a 92 chev 4x4 with a 5.7 in it . For some reason it is getting to much fuel . it runs rough and back fires blowing the muffler apart .I have changed the injectors but dont know where to start with the censors . I had it to a dealer they hooked it up to the scanner and got codes 32 and 42 . 32 was the egr so i changed that but they never said what the 42 was . thanks for any help i can get

Sep 13, 2009 at 7:31 AM

JDL

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Code 42 is a spark timing issue. How long since a tune-up? With the engine running, the pcm controls the spark timing on the white wire at the distributor. That signal is a dc pulse. Above a certain rpm the pcm sends a 5 volt signal to the ignition module, tan/ black wire. That tells the ignition module to use the signal on the white wire for ignition timing. Check the signal on the white wire.

Sep 13, 2009 at 8:57 AM