No Start! 12V+ at the coil, but no spark... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TIMSPEED · 04-21-2003, 12:58 PM

Well, again, my truck doesn't wanna start. I checked and I have full 12V+ going INTO the coil, but I don't have any spark coming OUT of the coil...would my coil be bad, or just the connections came loose? I mean, I was just driving it last night, why would it all of a sudden be bad this morning??? I think I'm just gonna go get a new coil and swap it in...would anything else be causing me problems?

Grim Reaper · 04-21-2003, 02:46 PM

If it's HEI I would suspect the control modual before the coil. There is a ground strap that goes under the coil that sometimes will corrode and cause a bad connection as well.

TIMSPEED · 04-21-2003, 03:06 PM

Actually, I pulled my coil and checked the resistance between the Ignition Lead and the Tach Lead...the resistance is SUPPOSED to be less than 1ohm...when I tested it, I got 3ohm's. Also the resistance between the Tach Lead and the Coil Output Point is supposed to have Infinite Resistance..I tested it and had NO resistance!

PHOENIX · 04-21-2003, 05:12 PM

Module usually is the problem over coil., but not always.
Does your truck have the ESC (Electronic Spark Control) distributor?
If so I say you scrap that POS.
I had nothing but problem after problem with mine.
I replaced countless coils and modules and other parts, it was nothing but a nightmare. It worked at random, very strange. It would start in the afternoon but never in the morning.
I say next time you get a chance and money you get rid of the stock distr. and get something else. I didnt have much cash so I went with the Proform for about $150-$160 and its been great to me. If you have the money though, why not get the MSD?

Just my thoughts!

Good luck!

TIMSPEED · 04-21-2003, 06:51 PM

Actually, it turned out to be just my cap was so carbon tracked, it wasn't firing.

04-21-2003, 12:58 PM	#1
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	No Start! 12V+ at the coil, but no spark... Well, again, my truck doesn't wanna start. I checked and I have full 12V+ going INTO the coil, but I don't have any spark coming OUT of the coil...would my coil be bad, or just the connections came loose? I mean, I was just driving it last night, why would it all of a sudden be bad this morning??? I think I'm just gonna go get a new coil and swap it in...would anything else be causing me problems? __________________ I have a few cars... See Them Here

04-21-2003, 02:46 PM	#2
Grim Reaper Registered User Join Date: Jul 2001 Location: Atlanta GA Posts: 1,704	If it's HEI I would suspect the control modual before the coil. There is a ground strap that goes under the coil that sometimes will corrode and cause a bad connection as well. __________________ Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project

04-21-2003, 03:06 PM	#3
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	Actually, I pulled my coil and checked the resistance between the Ignition Lead and the Tach Lead...the resistance is SUPPOSED to be less than 1ohm...when I tested it, I got 3ohm's. Also the resistance between the Tach Lead and the Coil Output Point is supposed to have Infinite Resistance..I tested it and had NO resistance! __________________ I have a few cars... See Them Here

04-21-2003, 05:12 PM	#4
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Module usually is the problem over coil., but not always. Does your truck have the ESC (Electronic Spark Control) distributor? If so I say you scrap that POS. I had nothing but problem after problem with mine. I replaced countless coils and modules and other parts, it was nothing but a nightmare. It worked at random, very strange. It would start in the afternoon but never in the morning. I say next time you get a chance and money you get rid of the stock distr. and get something else. I didnt have much cash so I went with the Proform for about $150-$160 and its been great to me. If you have the money though, why not get the MSD? Just my thoughts! Good luck! __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

04-21-2003, 06:51 PM	#5
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	Actually, it turned out to be just my cap was so carbon tracked, it wasn't firing. __________________ I have a few cars... See Them Here



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