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Old 07-17-2010, 04:08 PM   #6
ChevyTech
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Join Date: May 2004
Location: Minnesota
Posts: 4,620
Re: 1990 chevy code 42

The free tests that are done to modules at auto parts stores don’t always find all bad modules. Some pass the test but are problem modules. Heat is a factor, and people experienced with testing modules will often test them a couple times to see if it fails as it heats up.

Check to make sure the set timing connector is not unplugged.

You could test the wires between the module and the distributor with a meter and an ECM connector pin-out chart.

The ECM could be the problem, but it is more common for a bad distributor module to set this code.

Fuel issues should not cause a code 42 but they can cause a code 44 or code 45. Be care full when you count the flashes.

Often fuel pumps get replaced on these trucks when the fuel pressure regulator spring breaks. When the spring breaks the fuel gets dumped back into the tank and the pressure will be low.
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