Coil or Ign. Module? maybe wires?
Thread Starter
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
Coil or Ign. Module? maybe wires?
My 90 has been running rough here of late. So I removed each plug wire and put a spark tester in between the plug wire and the plug itself. The kind that has a light in it. I tried it on most of the plugs and it shows erratic spark. When the engine misses the light in the tester don't light. Could it be the Coil or the Ign. Module? The plug wires are maybe 3yrs. old Taylor 8mm. wires. ANY THOUGHTS GUYS Pipe
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Wait 'til it gets dark out them pop the hood and look for arch in the plug wires.....you can get a spray bottle of water too and spray the wires lightly to see if the engine misses excessively with water on the wires. Another thing to look at is the plugs or just change them if they are old. You may want to change the distributor rotor and cap first they are inexpensive.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Spark module and coil, when they get sick, they stay sick, they don't make every other spark weak. You have worn out plugs and/or plug wires. The night idle test is a very good test! Make sure your plug wire looms are all ok, and replace any that are broken or missing. It is important that your plug wires NOT touch any metal because all plug wires have microscopic pinholes in the isulation and they spark to ground through these pinholes if the wire is touching metal. Also, measure the resistance of each plug wire. If resistor wires, they should measure about 5000 ohms per foot.
Team Owner
Joined: Oct 2000
Posts: 96,443
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From: Fort Knox, KY
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I'll bet you've got the plug wire electrical creepy-crawlies! Check your coil wire, too, especially the section that touches the water pump housing.
Check at night or in a darkened garage. Pull your hood lamp fuse and look closely.
Be sure and replace any sections of missing corrugated plastic flexible tubing, too. Your coil wire should be insulated in it and there should be a four-inch section on each wire as it plugs into the Opti on LT-1 and LT-4 engines.
Check at night or in a darkened garage. Pull your hood lamp fuse and look closely.
Be sure and replace any sections of missing corrugated plastic flexible tubing, too. Your coil wire should be insulated in it and there should be a four-inch section on each wire as it plugs into the Opti on LT-1 and LT-4 engines.
Thread Starter
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
Ok gang here's the deal I replaced the ignition module the other day before I left for Carlisle and it didn't straighten out. I hooked a spark tester between the wire and the plug. You know the type with the clear tube in the middle with the light in it so you can see the light flash when it sparks. It was not a steady spark at all. Anyway when I got back from Carlisle yesterday I hooked the spark tester between the dist. cap and the plug wire seeing if I could eliminate the wire from the equasion and the spark was terrible. So now i'm going to replace the cap the rotor and the hypertech coil that gotta be the problem.
THANKS FOR ALL THE HELP Pipe
THANKS FOR ALL THE HELP Pipe
