Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi, I am Mike, welcome. I'm reviewing your question.
Do you have to disconnect something in order to set the ignition timing and if so was it unhooked? Is that what gave you that code 42?
Is everything hooked back up now?
Was the rotor off the very first time you looked at it after setting the engine at tdc? If so, perhaps your timing chain jumped.
Does the engine spi a white mist back out the intake manifold when trying to start or for those few seconds it does run?
Ok it sounds like the fuel mixture is too lean. A too lean fuel mixture will cause backfiring back out through the intake. Check for air leaks after that mass air flow sensor.
Check the fuel pressure also, it should be 34-47 psi.
Ok, cause if not, you might have a faulty regulator.
A faulty fuel pressure regulator could cause low fuel pressure and also a too lean fuel mixture, so yes a faulty regulator could be causing the popping.
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