Well i've probly posted on this before but what are the procedures on fixing a code 42? I could find anything while doing a search. The code 42 comes up with a code 33 also. I'm still waiting for it to get a little nicer out so i can work on the 33 but i don't have a clue as on what to do for the 42..
Any help would be appriciated.

Thanks,

Brendan

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1987 IROC-Z L98 350 SuperRam, Edelbrock Performer 6085 Aluminum Heads, LPE RollerCam 219/219, Crane Gold Race 1.6RR, TF 1 pc Chrome Moly Pushrods, Underdrive Pulleys, Edelbrock TPI High Flow Base Manifold, Accel 58mm TB, ADS 24#, Crane AFPR, K&N, Edelbrock TES Headers, Catco Hi Flow Cat, 3" Borla Cat-Back, Accel Cap & Rotor, MSD 8.5mm, MSD 6AL Ignition, MSD Blaster 2 Ignition Coil, Hayes Clutch, 1LE Aluminum DS, 94' Z28 Disk Rear, Wilwood Adjustable Proportioning Valve, Torsen Series 3 Posi Carrier, Precision 3.73 Gears, Southside Machine Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

 

Leirch,

The '42' is an EST error. You should check the knock sensor connections, the EST bypass connector, and base timing. Check all the connections at the distributor, including the HEI module in the base of the distributor.

A failing HEI amplifier/switch module can aslo cause a '42'.

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Later,
Vader
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