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???????????????????????????

Posted by Anonymous on

  • 4 more comments 
  • Anonymous Aug 02, 2008

    has new module

  • Anonymous Aug 05, 2008

    problem solved ;;;;;; bad ECM

  • Anonymous 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?

  • Anonymous 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 Answer

Fitted cranksensor injector loom still not starting ?


You would put on a new crank sensor because the ignition system won't work, it gives no spark. So now do you have spark at a spark plug wire end? A blue consistent spark? Probably good ignition system, as long as all spark plugs get a spark.

One thing you always want to check with no start is the fuel pressure. Turning the key to on should turn the fuel pump on and put pressure in the fuel rail at the engine. Autozone and maybe others rent or loan fuel pressure gauges. Multi-port injection systems have high pressure specifications, around 40 psi normally. That is what the injectors require to spray out fuel when they pulse and open the nozzles.

With the injector circuit, the first thing to check is if each injector has power to it with the key in ON. One power wire and one ground wire goes to each injector. The power wire is from a fuse that is powered with key on or key in start, and then it is spliced to all of the injectors. The injector grounds all run into the engine computer, where the circuit can be internally grounded for a split second and cause the injector to pulse. But anytime the key is on, the injectors have steady voltage available to them.

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So then the next questions are - - do you have spark to the plugs and power and pulse ground to the injectors ?

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If you have spark, the computer is getting the signal to pulse the injectors.
If you have power but no ground pulse, you may have fried the driver in the computer again.
You could get a used computer from a junk yard to test it.
There could be a short in one of the injectors or the harness at the computer, or a break in the circuit from the computer, and that could kill the driver in the computer.

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Are you not getting fuel to the throttle body? Or are you not getting any injector pulse? BIG DIFFERENCE!

If you have lost injector pulse and spark at the same time, the most likely cause would be a failed distributor module.

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1 Answer

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Actually the injectors don't spray "all the time". They pulse open for a few milliseconds then close every time they are grounded by the ECM. The distributor has a pick-up coil (Variable Reluctance sensor) that provides an A/C (Alternating Current) pulse every 120 degrees of crankshaft revolution to the Ignition Control Module also contained inside the distributor. The I.C.M. amplifies, rectifies and passes along the pules as a +12V square wave to the ECM. The ECM uses these pulses to calculate RPM and determine when the engine is rotating vs. stopped. Together with this information and more from Coolant Temp., Throttle Position, Manifold Pressure and Air Temp. the computer constantly 'looks up' what the appropriate amount of time it should pulse the injectors for to deliver the required amount of fuel.
With that in mind, the injectors are supplied with +12V via a 3 AMP fuse labeled INJ 1 for 1 bank of 3 injectors, and INJ 2 for the 2nd bank of injectors. Make sure your injectors are getting +12V whenever the key is ON or they wont fire (or at least 3 won't).
If all 6 injectors have +12V and you have fuel pressure (checked by pushing down in the center of the Schrader (tire valve stem looking thing) valve and fuel SPRAYING out, and your still not getting fuel it is probably because the injectors aren't pulsing. They are probably not pulsing because the ECM is not receiving any reference pulses from the distributor. If you have spark then you are producing reference pulses.
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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.

6. Test the Powertrain Control Module (PCM) powers and grounds during the problem.

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Fords have inertia fuel cut off switch. You need to check that first. If you dont have fuel. If you have fuel and no spark you need to check for inj pulse to injector. Make sure no fuses are blown. If no spark and no injector pulse then replace cranksensor.

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1 Answer

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if it runs on starting fluid its a fuel problem.. check fuel pressure even if its a couple of pounds off, the vehicle will not run. but using starting fluid may give you the extra poundage you need to make it run . also check vacuum hose at pressure regulator on fuel rail

Aug 02, 2008 | 1991 Buick Regal

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