Question about Buick Regal

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Car will not start when hot, starts and runs fine when cold, After car is shut off it will not start until the next morning. Does feel like it is surging a little at times. Have changed coil packs, computer, fuel pump relay and the fuel pump seems to be cycling

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Hi
If your engine is getting too hot, it can be in the cooling system, like the water pump, radiator, belt and the like, or engine timing may be off, and so forth. You even may have low coolant or a head gasket problem or cracked head, depending on the diagnostics. If that’s not the case then it sounds like the CKP (Crankshaft sensor) is faulty.
1. Scope the Yellow and Light Blue/White wires at the Ignition Control Module (ICM) cranking, using a scope when no spark occurs.

2. Or back probe these wires one at a time with a Digital Volt Ohmmeter (DVOM) and rotate the engine by hand. Both signals should toggle from 6-10 volts and down to 0 volts.
3. If the voltage does not toggle, retest voltage at these wires at the crank sensor harness. With the sensor unplugged, should be 6-10 volts.

4. Test B+ at the White/Black wire and B- at the Red/Gray wire at the CKP harness.

5. Make sure the voltage pulls down to 0 volts.



Also check the spark plugs and please check this link for more assistance.

Please do accept the solution and revert for further assistance.


Thanks
Rylee

Posted on May 17, 2009

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