Aftermarket Coil packs..in my future?? - 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 12-23-2003, 03:42 AM   #1
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Default Aftermarket Coil packs..in my future??

I ran a test on all three of the stock coils, the Chiltons said the OHMS between each termainal should be a minmum of 5400 and a max of 7000, the first pack was 5400, the second one was 5600 and the last one was at 5300.
Could this cause my crappy mileage, poor ideling, and a slight backfire problem??
Let me explain the backfiring issue in depth

A mechanic noticed it on the car a while back, in park when its warm, if u rev it up past 2500 rpms it starts to click loudly like pieces of wood being snapped, the higher the rpm the louder and more frequent they become, then if u let go of the gas and let the engine slow down to 1000 rpm there is a louder CLICK and if the car is parked on an incline it rolls back a bit (like if your on an incline, put the car in gear with your foot on the brake, then put it back in park and release the brake and it rolls back a few inches then stops)...anyone know??
Im running AC Delco plugs from Canadian tire and new plug wires.
It has a new MAF sensor, Air filter, O2 Sensor, fuel filter, and PCV valve. Ive noticed no diffrence with these new items.
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Old 12-23-2003, 05:16 AM   #2
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I think willwren had an idling problem that was solved by adding some MSDs. Must have been a tough decision
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Old 12-23-2003, 12:45 PM   #3
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Default Re: Aftermarket Coil packs..in my future??

Quote:
Originally Posted by SSEimatt93

A mechanic noticed it on the car a while back, in park when its warm, if u rev it up past 2500 rpms it starts to click loudly like pieces of wood being snapped, the higher the rpm the louder and more frequent they become, then if u let go of the gas and let the engine slow down to 1000 rpm there is a louder CLICK and if the car is parked on an incline it rolls back a bit (like if your on an incline, put the car in gear with your foot on the brake, then put it back in park and release the brake and it rolls back a few inches then stops)...anyone know??.


well it sound like to me that your wires are bad arcing out its very noticable at night start up at night then see if theres spark?
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Old 12-23-2003, 01:39 PM   #4
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Wires are usually more likely than coils, especially numbers 2, 4, and 6. And cheaper. If you eventually plan on doing both, do the wires first, unless a coil definitely reads bad, or the problem gets worse as the car heats up. Then lean towards the coil.

If you're looking for an excuse to go MSD coils.......well......I think I heard somewhere that if a GM coil goes bad, it'll blow up, burning a hole through the radiator or hood.

Really. I did. Honestly. You should go get the MSD today.

(disclaimer......just giving him an excuse....nothing like that ever happened)
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Old 12-23-2003, 03:12 PM   #5
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I think ill get a price on them for sure LOL
Also ive gone through 3 sets of wires, the stock ones, Boschs, and these new Prospark, they have made no diffrence! lol
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Old 12-24-2003, 02:13 AM   #6
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Try this to see if you can detect where the arcing is coming from:

At night, start the engine and use a fine-mist spray bottle on all of the coils packs and ignition wires. Go easy on the spray though. The any external arcing should become readily apparent.

Your low ohm reading sound pretty good to me. I think you should be wary of resistance (ohm) values that exceed the maximum.............I THINK.
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Old 12-24-2003, 02:32 PM   #7
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The clicking you are talking about sounds like the same as mine but it is not a back fire. It is the tranny, From what I have been told it is common for them to do it when reving in park. It is a pretty loud click it acts as if it is tryingto kick into gear, scared my first time mine done it, but it is "normal". Try reving the engine while under the hood (with car in park of course) I will bet you will find it is coming from the transaxel.
BTW mine is the 3800sc and 4t60e from a 93 ssei
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