Question about Buick LeSabre

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Turns over wont start

Replaced the icm and the crankshaft sensor still no fire to coils

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I believe GMC would state " Working as Designed"

Posted on Apr 19, 2014

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I have a 2.3 93 lx not firing on all 8 plugs each coil pack is firing only two plugs per pack new wires plugs coil packs and computer


Take the Ignition Control Module and have it tested at Auto Zone or Oreillys. If it tests ok, buy a tube of dielectric grease and coat the back of the module and reinstall it. Sometimes that will take care of it. If it still isn't firing right, then it could be the Crankshaft Position Sensor. The new ICM would cost around $90. Not sure about the CPS. Myself, I would go ahead and replace the ICM, even though the old one tested positive. Good luck. I hope this helps.

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How to fix a coail pack on a 1987 Pontiac 6000?


Coil packs are replaced not repaired if found to be defective. ---prev.gif next.gif DISTRIBUTORLESS IGNITION SYSTEMS Starting in 1987, some models came with engines equipped with a Computer Controlled Coil Ignition (C3I) or Distributorless Ignition System (DIS). Fig. 1: Triggering system used on the C3I fast start system 86812034.gif
Fig. 2: Electrical schematic on C3I ignition system 86812031.gif Both DIS and C3I system consists of the coil pack, ignition module, crankshaft sensor, interrupter rings and ignition control module (ICM). All components are serviced as complete assemblies, although individual coils are available for Type 2 coil packs. Since the ICM controls the ignition timing, no timing adjustments are necessary or possible. Fig. 3: Wiring schematic used on the C3I ignition system 86812032.gif Fig. 4: Notch effect on the output signal used on the crankshaft sensor 86812033.gif
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Oct 09, 2010 | 1987 Pontiac 6000

3 Answers

Engine just died while driving. turns over but wont start. replaced ignition coil. same problem, does not seem to be getting power to the coil. checked fuses also made suer it was getting fuel. 


Change the crankshaft sensor.That is your problem.They can fail anytime and when they do you dont get any power to the ignition coil.Let me know if you are still having problems.I think you will be fine after you have changed the sencor.Good luck m8

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1 Answer

Need to know what fires coil 1995 mercury sable both wires to coil have power when key is turned on car cranks no spark from coil new coil what gives the coil extra power to fire


what engine? 3.0L 2 Valve? 4 Valve?
3.4L SHO engine?

The PCM (engine computer) fires the coils, but it is never the cause of a problem. I suspect it is the crankshaft position sensor on the front of the engine by the crank pulley. easy to change.

Crankshaft Position Sensor The crankshaft position sensor (CKP sensor) (6C315) is a variable reluctance sensor triggered by a 36-minus-1 tooth trigger wheel located on the crankshaft pulley and damper. The signal generated from the crankshaft position sensor is called the crankshaft position (CKP) signal, which provides base timing and crankshaft speed (rpm) information to the ignition control module (ICM) (12K072). Base timing is set at 10±2 degrees before top dead center (BTDC) AND IS NOT ADJUSTABLE. The powertrain control module (PCM) (12A650) will use this information with the spark advance information to determine ignition coil (12029) turn on or turn off time.

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Cadillac wont start 1996


check your fuse box then your coil pack

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Have a 1991 buick lesabre 3800 v6, cant get to run, have had in a buick dealership replaced coil pack and icm, ran good for 2 then stopped, took back to dealership and the have been unable to find what is...


Check the ECM if it has the number 1228253 on it, this is what is wrong with it. Gm trashed all of these bad ecms. Get a 16198264 as they do not cause a cutting off problem . Get a delco ecm , aftermarket units will give trouble and may be a rebuilt 1228253 which is junk.

Apr 17, 2009 | 1991 Buick LeSabre

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