Question about GMC Sonoma

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Randomly, my 96 Sonoma(4.3) will "sputter," and RPMs move back and forth, like it wants to stall or "die." Service engine light has come on...code #340...something to do with a cam shaft or something...? Still no word from my mechanic...

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Check the connection to the cam sensor (the ECU cannot see any signal from it). If the electrical connection looks clean and good check the wiring for continuity back to the ECU. If the connection and the wiring are deemed good then remove the cam sensor itself and inspect it. These things become gradually cooked by engine temperature cycles over the years and eventually give up, Sometimes the casing shows signs of cracking Replace the cam sensor ans this should sort the problem...and it is not that expensive or difficult to do.

Posted on Sep 08, 2010

  • mhancz Sep 08, 2010

    thanks again!! doesn't seem to be a big deal, then, huh? i may be better off trying to get it from just a parts store, then waiting for my mecahnic to call back, and end up charging a fortune...thanks...MCH

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