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jim
jim, ASE Certified Technician
Category: Buick
Satisfied Customers: 1199
Experience:  ASE Certified A6,A8,L1 and California Licensed Smog Technician
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1988 Buick regal: 2.8L wont start..restart..shutting

Resolved Question:

1988 Buick Regal 2.8L won't start after engine is warm unless you restart it within a couple of minutes after shutting it off.
Submitted: 6 years ago.
Category: Buick
Expert:  jim replied 6 years ago.

We have seen a lot of problems with the injectors causing this type of problem. The following test will need to be done when the problem is happening.

 

Verify that the Purple/White wire from the Ignition module has a 0-5 volt square wave signal when it is a no start; if not, check the crank sensor output with an ac voltmeter. It must produce at least 0.6 volts ac while cranking.

Check the injectors during no start. All 6 must be above 12 ohms individually, or above 4 ohms when checking 3 at a time.

Verify that power and ground to the Electronic Control Module (ECM) is good, sensor readings are normal, and Purple/White wire is good to the ECM, as are the injector wires. If all OK, replace the ECM.

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