All 3 Ignition coils died at the same time? (Updated Aug23) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-20-2006, 02:20 PM   #11
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Quote:
Originally Posted by BillBoost37
Dick..the meter is autoranging. ... his readings should be right. That'* where my checking the battery in the meter comes in...I've seen odd stuff on a low battery.
Well, Duh...guess I should have read the whole thread again!

I'm sending myself to my room for breaking my own rule!
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Old 07-20-2006, 03:18 PM   #12
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Replacing the meter'* battery sounds like a really good idea. I just tested a 100 watt light bulb & got a reading of 10.8 ohms. Thought it would be an easy way to double check your meter. I imagine different brand bulbs will give different readings but should be fairly close +/- 30% ?
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Old 07-23-2006, 08:27 PM   #13
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Well it'* not the coils. I picked up some new ones and they give me the same readings on my meter as the old ones. Must be something to do with that particular meter, strange, it reads everything else correctly.

Any suggestions? Next thing I'm going to try is the crankshaft position sensor, as it'* cheaper than an new ICM.
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Old 07-23-2006, 08:47 PM   #14
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Don't throw money at it until we check a few things. Did you check all the fuses? Check drivers side & passenger side under the dash. If no fuses are blown check for power going to the ICM. Remove the wiring harness from the ICM & check for 12 volts at the pink (pink/black some years) wire . It'* on one end of the connector. Key needs to be in the run position while checking.

Edit - Before doing this test check your meter by checking the battery voltage.
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Old 07-23-2006, 09:11 PM   #15
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Checked fuses already. All good.

I'll check the ICM voltage and post back.
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Old 07-23-2006, 09:29 PM   #16
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11.84V on the pink ICM connector wire.
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Old 07-23-2006, 09:53 PM   #17
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Quote:
Originally Posted by Arbelac
Well it'* not the coils. I picked up some new ones and they give me the same readings on my meter as the old ones. Must be something to do with that particular meter, strange, it reads everything else correctly.
Alright, this confirms the meter is faulty on resistance scale. Those coil secondaries should read 5-8 k ohms as previously stated. Not to go off topic, but a side note. What brand & type digital multi-meter do you have?
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Old 07-23-2006, 09:59 PM   #18
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It'* a Di-LoG DL235 Clamp Meter. Not an inexpensive one either...

Oh, it reads the light bulb correctly, as above, i get 10.3ohms on a 100Watt bulb.
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Old 07-23-2006, 10:17 PM   #19
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We need to take a step backward & have you tell us how you determined it'* not getting spark. If it'* not sparking you have it down to wires/plugs, ICM or crank sensor. The wires/plugs aren't likely if you checked more than one. ICM & crank sensor you'll have to decide which to try first.
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Old 07-23-2006, 10:56 PM   #20
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Do you know anyone with a GM car that you can swap ICMs with as a test?
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