Unusual spark from a 16v coil.......any ideas? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-08-2002, 04:52 PM Thread Starter
 
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Unusual spark from a 16v coil.......any ideas?

I have finished my own "sleeper" project, but I cannot get it to start. Its a stock 87 with a 95 16v.

I'v traced the problem to the ignition system (I think). When I check for a spark from the coil, the results are odd.
When I turn the key to start (cranking) there is an initial spark....during the cranking, there is no spark...when I release the key there is a spark or two as the inertia keeps the engine rotating a few turns.

I have two spare coils and a spare ECM, no change after swapping components. I'v followed the trouble shooting guide in the manual and all the voltages are correct.

I'v been farting with this for days now and figured I'd throw it out to you'all for ideas.
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post #2 of (permalink) Old 10-08-2002, 05:02 PM
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Re: Unusual spark from a 16v coil.......any ideas?

Not sure on that '95 engine, but the ones that use a ballast resistor in the system will do that when they go bad . Also may want to check the pickup coil in the distributor as they can cause the same problem .
Sarge
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post #3 of (permalink) Old 10-08-2002, 10:09 PM
 
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Re: Unusual spark from a 16v coil.......any ideas?

dont know anything about the 16 valve but it sounds like the power for the coil or iginition system is conected to a circut that shuts off with the key in the start position and on in the on position might try to jump the starter run a wire from the cylinoid on the starter to the battery see what happens
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post #4 of (permalink) Old 10-09-2002, 05:52 AM
 
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Re: Unusual spark from a 16v coil.......any ideas?

You're scaring me Whazoo! Let me know if you need a hand with troubleshooting things. I could probably come down this weekend and help if you need help.

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post #5 of (permalink) Old 10-09-2002, 09:51 AM
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Re: Unusual spark from a 16v coil.......any ideas?

I don't have a wiring diagram for your vehicle, but --
If you have 2 small terminals on your starter
solenoid, one's an ignition resistor bypass.

If you've put both small wires on the "S" or
Start terminal you'd make the condition you
described.

During cranking the ignition is grounded through
the solenoid, then when you "let go" the coil
gets it's power, but it's going too slow to start,
unless you are really lucky. It may occasionally
start, but unreliable.

Check the voltage at the coil during cranking,
you'll see it drags way down.

Please let us know what you find out on this
thread, someone else may encounter the same
problem someday.

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