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I replaced the ignition control module in my 99 GMC Sierra 2500. It still will not start. It turns over but wont start. Checked the fuses and the distributor and the coil. What else can I look for? The fuel pump is working and the fuel regulator has the required pressure.
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NO VIN told so>?
C2500 or K2500, Sierra is trim.
a PICKUP truck>?
Not a Suburban right?
most cars made have starter relay so the super expensive ignition switch does not burn up ST contacts.
and cars GAS have ignition module, only location changes (if a Distributor it's there) if not Dizzy it's in the ECU or on some cars fire wall to COP coils.
1991
C2500 guess a Pickup is it?
4.3L engine, sorry not doing all 5 engines and diesel
shows distributor and ICM and 1 coil.
and no relay starter see schem.
There are two ECM fuses - marked ecm 1 and ecm B. ECM B powers the fuel pump and the Veh control module which handles most of the sensors. ECM 1 powers the ignition module, coil, injectors and the rest of the engine sensors. You may need a repair book with diagrams to check all of the circuits for shorts.
CHECK IGNITION SWITCH 40 MP FUSE AND STARTER FUSE LINK.CHECK ALTERNATOR FUSE.MOST TIME IF BATTERY POLARITY HOKED UP WRONG YOU CAN FRY RADIO, ALTERNATOR, ECM, AND THE IGNITION SYSTEM.
GM has a service bulletin for this symptom.They say that in cold tempetures the blower control module fails also known as a linear control module. This only applies to vehicles with automatic temperture control.
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