Testing Coil Packs - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 03-30-2009, 01:26 AM
Bradwho's Avatar
Bradwho Bradwho is offline
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2005 Chevy TrailBlazer LS
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Testing Coil Packs

Is there any way to test the coil packs for the do-it-yourselfer? I just want to make sure they are putting out what they are supposed to be. Not having any probs yet, but I am ever proactive.
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  #2  
Old 03-30-2009, 12:34 PM
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I wonder if its just better to go on ebay and buy 1 or 2 used ones- and have them as spares.. I thinks they go for $30.
that could be an even easier 'test' for when you get one fail...
just swap them.
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  #3  
Old 03-30-2009, 07:19 PM
WOOLUF1952 WOOLUF1952 is offline
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I would think you would need a special piece of test equipment to get an accurate reading. Auto parts stores sell adapters to see if you are getting a spark.
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Old 03-30-2009, 09:07 PM
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Quote:
Originally Posted by rbarrios View Post
I wonder if its just better to go on ebay and buy 1 or 2 used ones- and have them as spares.. I thinks they go for $30.
that could be an even easier 'test' for when you get one fail...
just swap them.
There is a seller that has new ones for roughly around $30, and they are genuine delphi coils, BRAND SPANKIN NEW!!

Quote:
Originally Posted by WOOLUF1952 View Post
I would think you would need a special piece of test equipment to get an accurate reading. Auto parts stores sell adapters to see if you are getting a spark.
if you don't have an adapter, you can also wrap copper wire around the thread of the spark plug and grown the other end of the copper wire. Just make sure it doesn't touch anything else.
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Old 03-30-2009, 11:56 PM
WOOLUF1952 WOOLUF1952 is offline
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The tester I have has an adjustable air gap. The wider the gap, the more voltage being put out by the coil. But as posted earlier, I don't know how accurate it is.
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Old 03-26-2011, 11:36 PM
DenaliDaddy DenaliDaddy is offline
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2005 GMC Envoy Denali XL
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Revive... Rethink...

Hi guys, know this is an old thread, but figured I didn't need to start a new title. (Unless nobody replies to this one.)

Anyhow,
I'm wondering if anyone knows a way to bench test our coils. Like at the basic level with a multi-meter. There HAS to be a set of parameters between given pins that is a known figure. Things like resistance between pin 1 and 4, 3 and the output, whatever....

I know that some shops have a bench test unit for coils that have the ability to input voltage for a measurement at output. Not to mention the 'air gap' setting where the stronger the output, the larger the gap.

I was just wondering if perhaps there's something that's quick and easy, that would at least tell if it's dead or not.

Like a lot of us here I'm sitting around doing this... Not wanting to buy 3 coils when chasing down the dreaded "random misfire". While it first looks like it's at least on 4, I'm also suspecting 6 is acting up, and maybe even 3. Problem is, it's idling so rough that swapping a good coil to the place where there are bad ones really doesn't help that much because it'll still have a rough idle no matter where I move the dead coil(s). I'd LOVE to have 3 or 4 then put one at a time in and see how it helps.

FWIW It's got 90844 miles. Had all new plugs put in 8,000 mile ago. Thought I'd also go ahead and put all new wires in this time for $hits and giggles while I've got it turned upside down. (Well actually only the washer fluid resevoir is upside down, uh... turned on it's end that's it.)

Thanks,
DenaliDaddy
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