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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Posted on Jan 02, 2017

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1 Answer

Does a 2004 chevy venture van have a coil pack?


Your Van ? Yes it does !
• Ignition control module (ICM) and ignition coils
Three dual tower ignition coils are mounted to the ICM, and are serviced individually. The ICM performs the following functions:
- The ICM receives and processes the signals from the CKP sensor B.
- The ICM determines the correct direction of the crankshaft rotation, and cuts spark and fuel delivery to prevent damage from backfiring if reverse rotation is detected.
- The ICM determines the correct coil triggering sequence, based on the 7X CKP signal. This coil sequencing occurs at start-up, and is remembered by the ICM. After the engine is running, the ICM will continue to trigger the coils in the correct sequence.
- The ICM produces and inputs 3X reference signals to the PCM.
- The ICM contains the coil driver circuits that command the coils to operate.
• Crankshaft position (CKP) sensors
The CKP sensor B is a variable reluctance sensor. The magnetic field of the sensor is altered by a crankshaft mounted reluctor wheel that has seven machined slots, six of which are equally spaced 60 degrees apart. The seventh slot is spaced 10 degrees after one of the 60 degree slots. This sensor provides the ignition control module (ICM) with 7X signals, or seven pulses for each revolution of the crankshaft. The pulse from the 10 degree slot is known as the sync pulse. Both of the sensor circuits are connected to the ignition control module (ICM). A signal converter within the ICM produces digital 3X output pulse to the powertrain control module (PCM), the 3X reference is known as the low resolution engine speed signal.
The CKP sensor A contains a hall-effect switch. A hall-effect switch is a solid state switching device that produces a digital ON/OFF pulse when a rotating element passes between the sensor tip and a magnet. This rotating element is called an interrupter ring or blade. In this case the interrupter ring has 24 evenly spaced blades and windows and is part of the crankshaft damper assembly. This sensor provides the PCM with 24X signals, or 24 identical pulses per crankshaft revolution. The 24X signal is used for enhanced smoothness and idle stability at a lower calibrated RPM. The PCM supplies the sensor with a 12-volt reference, low reference, and signal circuit.
• Camshaft position (CMP) sensor
The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor does not directly affect the operation of the ignition system. The CMP sensor information is used by the PCM to determine the position of the valve train relative to the crankshaft position. By monitoring the CMP and CKP signals the PCM can accurately time the operation of the fuel injectors. The PCM supplies the sensor with a 12-volt reference, low reference, and signal circuit.

Jun 13, 2017 | Cars & Trucks

1 Answer

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.

Dec 31, 2010 | 1992 Ford Mustang

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

Dec 27, 2009 | 1990 Isuzu Pickup

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.

Sep 15, 2009 | 1995 Mercury Sable

2 Answers

Cadillac wont start 1996


check your fuse box then your coil pack

Sep 04, 2009 | 1994 Cadillac DeVille

2 Answers

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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