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help 6/14/2011

1994 GMC K2500 Suburban Base 8 Cyl 7.4L

Engine

Dead battery, charged up and it turns over, but has no spark or fuel.

Tried jumping it with a power pack when it was dead, did I burn something out?

5 Answers


HouseCallAuto

HouseCallAuto 6/14/2011

1. Check power to the module and ignition coil on the Pink wire while cranking, and verify that the distributor has a good ground.

2. Use a test light to Battery Positive (B+) and touch the White wire at the coil. The light should blink on and off as the engine is cranking.

3. If so, and no spark from the coil, replace the coil.

4. If no blinking on the test light, and the light is off, disconnect the pickup coil wires from the Ignition Control Module (ICM) and check the A/C voltage from the pickup coil cranking. It must be above 0.7 volts.

5. If not, replace the distributor shaft and pickup coil.

6. If OK, replace the ICM and coil.

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help

help 6/14/2011

HouseCallAuto: would jumping the battery damage something that could affect both fuel deiivery and spark?

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HouseCallAuto

HouseCallAuto 6/15/2011

Only if you reversed the polarity while in the process.

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HouseCallAuto

help 6/15/2011

What could cause a combination of no fuel, no spark? ECM power, or ground?

HouseCallAuto

HouseCallAuto 6/15/2011

I gave you a diagnostic circuit test to do.

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HouseCallAuto

help 6/15/2011

Yes you did, but what if you don't have power to the module and coil?

HouseCallAuto

HouseCallAuto 6/15/2011

If there is no power to the module or coil on the PINK wire then stop right there. There has to be battery voltage coming into the connector of the ignition coil. There is a PINK wire and a WHITE wire. Check the PINK for 12 volts. If no voltage then check for 12 volts coming from the ignition switch, same wire. I think you have a burnt fusible link. The fuse links come off a block at the center of the firewall in the middle of the engine compartment. The fuse link in question if it were open would not only cut battery power to the coil but also to the STOP / HAZARD fuse, use that to confirm it. The STOP / HAZARD fuse should have battery voltage on both sides of the fuse. If no power there then the fuse link is open at the battery junction block that all the fuse links attach to.

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