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mackin1, Auto Service Technician
Category: Chevy
Satisfied Customers: 473
Experience:  Foreign/Domestic Vehicles
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we have a 97 S10 with a 2.2l engine. We have a random cyl. misfire.

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we have a 97 S10 with a 2.2l engine. We have a random cyl. misfire. We have check compression(even through all cyl.), vacuum(needle steady @ 17lbs), good spark at wires and all plugs are burning clean. We are wondering if the ignition control module is our problem, and how we check the module to see if this is the problem?

Hi there and welcome to JA

Random misfire could be from vacuum leak or bad fuel-could also be your injectors, low fuel pressure / lean mixture/ stuck open EGR. Did you get a P0300

Customer: replied 8 years ago.
no the code i am showing is a p0302 but on the scanner we are showing that cylinder 4 is misfiring and cylinder 2 is not
Could be a weak coil/injector problem. The igniton control module's job is to tell the coil to fire the plugs.
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