OEM Ignition Coils vs ?
Thread Starter
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Joined: Jan 2025
Posts: 89
Likes: 15
From: Springville, Utah
OEM Ignition Coils vs ?
Running OEM ignition coils and have a P0300 misfire. Cost of new OEM ignition coils is about $ 150 per. Does anyone have a better and cheaper replacement suggestion for a stock 2011 Grand Sport.
Drifting
Joined: Apr 2021
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From: Peoria, AZ
2023 C6 of the Year Finalist - Modified
I have a set that I will sell you for $100 + shipping......PM me. I had them on my LS2 when I changed to an LS7 so I have another set. They work perfectly.
Safety Car
Joined: Feb 2016
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From: SC
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,620
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From: Cape Coral, Florida
How do you know it’s a coil pack ??…what testing have you done ??…coil packs on these cars are pretty much bulletproof !!….you should do a little more diagnostics before shot gunning parts.
Thread Starter
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Joined: Jan 2025
Posts: 89
Likes: 15
From: Springville, Utah
Understand your thoughts, My Tech Tool shows a P0300 misfire. The Vette has 75,000 miles, I am going change the plugs and wires
and thought I might as well replace the coils also....looking for a basic coil for a stock 2011 GS
and thought I might as well replace the coils also....looking for a basic coil for a stock 2011 GS
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Well good luck and if you still have a misfire after changing plugs, wires, and coil packs you don’t have the diagnostic equipment to find the cause.
Thread Starter
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Joined: Jan 2025
Posts: 89
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From: Springville, Utah
Noted, I do not have the equipment and the dealership wants $ 125.00 for a check. Thinking outside the box, Delphi OEM at $ 30 @ 8
seems reasonable investment as the car has 75K miles...could be the coil rack also
seems reasonable investment as the car has 75K miles...could be the coil rack also
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From: Cape Coral, Florida
WHY are you even taking it to a dealership for a diagnosis ??…they’re idiots and will just replace more parts…find an automotive diagnostician in your area and go there…they TEST !!…watch the video…this is the equipment (labscope) needed along with the knowledge required to find a misfire…mechanics only know how to change parts.
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Doubtful you will find signs of a misfire by just looking at the plugs…finding a shop like Royalty Auto is like finding a needle in a haystack…I usually tell guys other than changing plugs and wires don’t waste your money just changing parts…”test don’t guess” !!
Racer
Joined: Mar 2010
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From: Discovery Bay, Ca.
Burning Brakes
Joined: Jun 2022
Posts: 750
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From: Florida
Misfire
A common problem that I have personally experienced is a wire can detach from a coil and using vehicle specific OBDII data can appear as a P0300, using generic OBDII data it can show up as a specific cylinder misfire. Nearly any scan tool will display both. Cheap code readers often display generic OBDII data as well.
Racer
Joined: Jan 2004
Posts: 255
Likes: 41
From: Lake Charles LA
Unless you are sure the coil is bad, it could be the wire, or in my case ('06) it was cracked insulation on the spark plug. Two long cracks were leaking voltage, and throwing a #7 mis-fire. A quick, easy fix - just changed the plug.