Question about 1991 Buick Regal

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No start,91 regal 3.8 w motor

Plenty of fuel,spark,power to injectors,no injector pulse; new ICM, fuel pump, still no start HELP???????????????????????????

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  • bigdad081163 Aug 02, 2008

    has new module

  • bigdad081163 Aug 05, 2008

    problem solved ;;;;;; bad ECM

  • Tsati Aug 16, 2008

    I have a 95 buick that has spark , fuel and a test lamp shows the injectors is pusling. Control module tested OK (we tested it 4 time sin a row to make sure it worked hot) can it be the ecm on mine too?

  • freds678 Sep 01, 2008

    Same thing here, 95 Lesabre, 3800.

    No Spark, No Injector pulse, replaced Ignition Module.

    Now has spark, still no Injector pulse.

    Checked VATS key 1468 ohms = #6 key blank.

    Blue wire, ouotput from VATS module to ECM =2.49 V (reading HZ with DVOM)

    Changes state from 0V /2.49 V with key cycle.

    Assuming this is correct, ECM should be the only solution?

  • Anonymous Mar 12, 2014

    white smoke at idel better after few miles it clears up has plenty of power and gets good fuel milage radiator level is good no leaks changed fuel filter and fuel pump and injectors

  • Anonymous Mar 27, 2014

    will a bad fuel injector cause motor not to start on a 2004 dodge ram 2500 disiel

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  • 4 Answers

Sounds like an ignition module

Posted on Aug 02, 2008

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1. Freeze Powertrain Control Module (PCM) and see if the problem can be duplicated.

2. Wiggle tug test wiring for #2 injector.

3. Scope the #2 injector for a glitch when the misfire happens. 1. Test for the Exhaust Gas Recirculation (EGR)/coolant adapter gasket leaking EGR gases past the gasket.

2. Connect a vacuum pump to the MAP sensor, block the vacuum source, reset fuel trims, start the engine and add typical vacuum to the MAP sensor and check operation.

3. Test the spark output with 2 High Energy Ignition (HEI) testers, at 25 KV air gap each, at the spark plug wires to ground at wires 2 and 3, then 1 and 4 at cranking speed and engine running.

4. Test the fuel injector pulse width at the injectors compared to the scanner data.

5. Disconnect the O2 sensor, reset the fuel trims, test the system operation in open loop, test injector pulse width. Compare to the closed loop operation injector pulse width and engine operation.

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Aug 02, 2008 | 1991 Buick Regal

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