Bad Coils???
Pro
Joined: Jul 2000
Posts: 590
Likes: 1
From: Suffolk New York
Racer
Joined: Jan 2006
Posts: 415
Likes: 1
From: Ft. Wayne In
Link for a how to http://autorepair.about.com/od/troub...l-test-ohm.htm I'm not where I can get to my manual,so I can't post the specs.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
Check the ground wires on the rear of the driver's side head. If they come lose, you'll have spark issues. The coils appear to be pretty strong from what I've seen and too date, I can't remember anyone saying they had one fail.
Pro
Joined: Mar 2004
Posts: 653
Likes: 0
Any time I get a car with either P0200, P0300, or other anomalous behavior I whip out the Ohm-meter and test all 8 injectors, coils, and plug wires. In all but one case, this found the root cause either by identifying a failing component or corrosion on an electrical connector.
I tracked a P0200 DTC down to a single coil by testing resistance on all 8 coils, found one that was way different than the other 7. The engine was running fine, no misfire counts recorded, just the occasional P0200 when the engine was up to temp.
Don't recall which two coil pins are the + and -, but they're the ones you probe with an Ohm-meter. It's in the Helms manual.
The new GM part tested within a few hundredths/Ohm of the other 7 coils, so on it went and no further problems.
I tracked a P0200 DTC down to a single coil by testing resistance on all 8 coils, found one that was way different than the other 7. The engine was running fine, no misfire counts recorded, just the occasional P0200 when the engine was up to temp.
Don't recall which two coil pins are the + and -, but they're the ones you probe with an Ohm-meter. It's in the Helms manual.
The new GM part tested within a few hundredths/Ohm of the other 7 coils, so on it went and no further problems.
Burning Brakes
Joined: Aug 2006
Posts: 1,217
Likes: 5
From: Stark County Ohio
You can purchase an adjustable spark checker at your local auto parts store.
It plugs into the high-tension boot in place of the spark plug itself. You can adjust the gap to observe the strength of the spark.
Should be a HOT, FAT spark at the engine’s specified gap setting.
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Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Stock GM OEM LS1/6 coils are very good and reliable units able to support well over 600 hp. If your having issues with more than one coil, thats very strange and points to issues other than the coils
Volt and Ohm Meter is your friend!
BC
Volt and Ohm Meter is your friend!
BC
