Question about 1986 Buick Riviera

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I have an 1986 buick riveria, no spark at plugs, i have done ohms testing at the icm and the coil packs, these are getting proper results. have checked all fuses and fusible links that i can find, all good. i am getting ready to pull the rest of my hair out. please help if you can.

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  • Clint Smock
    Clint Smock Jun 07, 2010

    What size engine? RWD or FWD?

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  • Master
  • 645 Answers

You can have the module off its bracket and take it to auto zone and have it tested. If they are bad than I would find a way to retrieve the codes from the computer. You can get a manual from auto zone or orielly that shows you how to retrieve the codes since it is not obd 2. Your problem could be crank sensor, but you need to get the codes. Hope this helps.

Posted on Jun 07, 2010

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No spark no fire


The computer calculates spark timing from the crank position sensor, so I suppose you could try that.

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If any of the ignition components fail, you should get a check engine light and a trouble code for that component.
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I have a 94 Buick park ave. I replaced icm, ecm, tps, map sensor, cam position sensor, and crank position sensor. Starter tested good but not getting a spark. What can it be


Have you tried testing the ignition coil pack(s)? If this goes out then there wouldnt be any spark delivered to the plugs, this part is relatively cheap and is a common problem causing no spark.

Jul 01, 2011 | 1994 Buick Park Avenue

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No spark at coil pack changed coil still no spark on 2 and 5


Try switching your coil packs around see if you can get spark out of the 2 & 5 with a different coil pack in that location. If that doesn't work maybe your ICM they can test the ICM at autozone, but can't test the coil packs.

May 03, 2011 | 1991 Buick Park Avenue

1 Answer

What should a multimeter read on a continuity test on the coil packs? i'm getting 1.9,1.7,1.7


The multimeter can read the resistance and if it is not open or shorted out, I'd say that your readings are in the normal range, comparing each resistance with each other + or - 10%.

I looked up the resistance readings on my online resource, but they did not list it specifically.
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I looked up the following on autozone.com:

There are 3 dual-tower ignition coils that are part of the ignition control module (ICM). The ICM contains coil driver circuits that command the coils to operate. The Powertrain Control Module (PCM) controls each dual-tower ignition coil by transmitting timing pulses on the ignition coil control circuit to the ICM for the proper coil to enable a spark event.
  1. Inspect the spark plug wires for proper orientation.
  2. With the ignition OFF, remove the fuel pump relay.
  3. Crank the engine and test for a strong spark on each cylinder spark plug wire using a suitable spark plug tester. Ground the companion cylinder spark plug wire of each cylinder when it is tested.

    If a strong bright blue spark is present on all of the cylinders, remove and inspect all of the spark plugs for proper torque, proper gap, wear, damage, and fouling. Replace the spark plugs if necessary. If there is no spark on any of the cylinders, test the ignition voltage circuit of the Ignition Coil Module (ICM) for an open/high resistance or short to ground, or test the ground circuit of the ICM for an open/high resistance, or a faulty ICM. The wire circuit resistance should measure less than 3 ohms. If there is no spark on any of the cylinders, or spark is weak or intermittent, test the IC circuit for an open/high resistance, or a faulty ICM. The wire circuit resistance should measure less than 3 ohms. If spark is present on one or more of the cylinders, inspect and test the spark plug wires for arching, cuts, rubbing on other components, and proper resistance. If all tests are normal, then the system is operating correctly.
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Oct 08, 2010 | 2000 Chevrolet Venture

1 Answer

My 94 ford mustang is a 3,8 v6. It will turn over but wont start. I have checked everything and Im getting power to the coil box but no spark to the plugs, what do you think is wrong?


You can start here;

ICM Test

See Figure 1
  1. Remove the ICM from the front fender apron.
  2. Measure the resistance between the ICM terminals as shown below:
    1. GID-PIP IN: should be greater than 500 ohms.
    2. PIP PWR-PIP IN: should be less than 2,000 ohms.
    3. PIP PWR-TFI PWR: should be less than 200 ohms.
    4. GND-IGN GND: should be less than 2 ohms.
    5. PIP IN-PIP: should be less than 200 ohms.

  3. If any of these checks failed, replace the ICM with a new one.

Sep 03, 2010 | 1994 Ford Mustang

2 Answers

1994 Buick Park Avenue will turn but won't start. They say it's an ICM Code. Can someone other than a mehanic put it in?


Yes. will sit under the coil pack's, that's where the spark plug cable hook to coming from the spark plug's, sit on top if engine, easy to get to, remove all three coil pack, two small screw's to each coil pack, disconnect harness to ICM will have about 26 small wires on the connector, connector will have a small bolt, in center of harness connector, unscrew small bolt and harness will come out, revese to install new ICM.

Jul 19, 2010 | 1994 Buick Park Avenue

1 Answer

Number one cyl on coil pack not firing, all others are, codes reads misfire on 1 cyl should i replace the coil pack and how do you test the pack


Check the spark plug first. then if the plug is good you wil need a digital ohm meter to test the coil pack. if you need to know how to remove the coil pack let me know, to test put on ohms should not have more than 2 1/2 ohms restance betweent coil lead to coil connector. If you test the coil pack on both sides of the pack and get a reading then the coil is bad, if it does not read then you haave a bad fireing plate diode.

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