Coil squeal after teamrush/grounds - JeepForum.com

 
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post #1 of 8 Old 09-03-2009, 11:14 AM Thread Starter
Olrev
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1981 CJ7 
 
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Coil squeal after teamrush/grounds

What is causing my new setup to squeal? I did the teamrush and everything has run fine. Yesterday I finished my grounding. When I turned the switch on, I got this weird high pitched squeal coming from the coil I think. It is a junkyard coil but it didn't give me any problems before I put in all my grounds.

Video/Audio link:
YouTube - Ign Squeal

Any ideas?


Last edited by Olrev; 09-03-2009 at 12:16 PM.
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post #2 of 8 Old 09-03-2009, 11:41 AM
BioTex
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I don't think it is possible for a coil to squeel. There are no moving parts. Look elsewhere like fan belts.

'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.

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post #3 of 8 Old 09-03-2009, 11:58 AM Thread Starter
Olrev
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Engine is not running. This is with the switch on before cranking.
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post #4 of 8 Old 09-03-2009, 12:11 PM
BioTex
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Quote:
Originally Posted by Olrev View Post
Engine is not running. This is with the switch on before cranking.
Sorry, I glanced right over the youtube video. Thought it was in your signature line.

'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.

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06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's

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Current project. Stroker/FI ?
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post #5 of 8 Old 09-03-2009, 06:04 PM Thread Starter
Olrev
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Need major input now. I checked the "squealing coil" earlier today and with the ignition switch on/engine NOT running, my coil wire had "fire"...I know because it shocked the crap out of me.

so, I took the jeep for a ride down the road. After a few miles it began to lose power, backfired a couple of times and went dead. It would crank but was struggling, fighting the starter, like a timing issue. I could get it to run for a few seconds, it would start 'loping' then backfire and die. I've also noticed that my squeal in the coil is now gone...it also is no longer "hot" like it was when squealing. Took the distrib cap off and the new rotor is charred just a little.

If my coil was shot, would it even crank? Have I jacked my timing somehow?
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post #6 of 8 Old 09-09-2009, 04:54 AM
John Strenk
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I had that happen to me once and it turned out to be a problem with low battery voltage somehow. It went away when I charged up the battery but I'm not sure it that was the cure or redoing all my grounds at the same time fixed it. I wasn't consintrating on the noise at the time.


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post #7 of 8 Old 09-09-2009, 06:43 AM
Mike1084
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Do you have a condenser, mounted to the side of the coil? Typically these are used for filtering out noise to the radio and in older vehicles with point type ignition system it prevents the points from arcing and prevents coil insulation breakdown by limiting the rate of voltage rise at the points. . All that said they will squeal and if they go bad, (shorts out to ground), it will cause issues. if you have one, disconnect it and see if the problem goes away.
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post #8 of 8 Old 09-09-2009, 08:07 AM
JeepHammer
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I didn't see the 'U Tube' video, can't get it to load,
But if the coil is cycling before the engine cranks, you have the trigger wires and coil wires bundled together and INDUCTION is triggering the coil in a feedback loop before you even start the engine.

Trigger wires should be twisted around each other,
And should NEVER be bundled with the coil feed wires or the high voltage wires.

These wires trigger on as little as 0.2 volt, which is easily produced by induction from the coil feed wires if the wires are bundled together.

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