Author Topic: No spark. Please help  (Read 6009 times)

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Offline Drivehard

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No spark. Please help
« on: December 29 2014, 12:09:07 AM »
I installed a 3.8 out of a 1987 Century in a sand rail I built for my kids for Christmas. I know they are not exactly the same as the gn but very close. 100% disclosure, I bought the motor clutch and adapter. He had lost the wiring harness and computer. (I know about the megasquirt and I can not afford that set up).  I bought a wiring harness from an 87 turbo car. Both pin outs are the same on the diagrams I got from all data pro.  Bought a reman 1227783 ecm (and an ebay used one with the prom)  The cam sensor is new Crank sensor is new  Ignition control module is new   I have no spark. At all   I have power and ground at the ignition module. Power and ground at cam and crank   I ran all the ignition switched wires to a fuse block that is turned on and off via a relay.   I ran all the grounds to the negitive side of the battery.   I can not for the life of me figure this out.  I just went through the entire wiring harness and can not find any problems with the wires or where they are ran. 

Offline Drivehard

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Re: No spark. Please help
« Reply #1 on: December 29 2014, 12:13:56 AM »
Looking at the wiring diagram there is a small sign on the top of the ignition control module that says C3I and a ground symbol. Does this mean the case should be grounded?  It is on the bracket on top of the head but not sure it would get ground there as that bracket is painted.

Offline TexasT

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Re: No spark. Please help
« Reply #2 on: December 29 2014, 10:17:50 AM »
First thing I think is that you went to battery. Is there a ground strap from battery to block?
Rich

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Offline Drivehard

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Re: No spark. Please help
« Reply #3 on: December 29 2014, 10:25:00 AM »
I was starting to wonder that. There is a ground strap to the frame.  The frame of corse is steel and the motor mounts as well as transmission mounts are solid metal welded to the frame.  I am headed to napa this am to buy another ground to run to the block. 
When I went through the wiring last night I changed the grounds to go to the block and frame anyway. 

Offline Drivehard

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Re: No spark. Please help
« Reply #4 on: December 29 2014, 10:24:18 PM »
Grounds redone, one to the block one to the frame. 
Pins I deleted when installing
A1, A5, A7, A8, A9, A10
B8, B10 (not sure if it needs to be grounded so it's still long enough)
C7, C8
D2 ,D3, D5, D9

Maybe I screwed up doing something there?




Offline TexasT

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Re: No spark. Please help
« Reply #5 on: December 29 2014, 10:47:21 PM »
There is a fellow that goes by salvagev6 over on tb.com he is very good with electric on these cars. You might pm him over there and see what he has to say.
I'm guessing you have been over to gnttype.org and vortexbuick.co m and looked over the diagrams.
Rich

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Offline Drivehard

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Re: No spark. Please help
« Reply #6 on: December 30 2014, 02:40:20 AM »
I will. Thank you

Offline Drivehard

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Re: No spark. Please help
« Reply #7 on: December 30 2014, 10:22:18 AM »
I sent him a pm.   Thank you. 

Offline daveismissing

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Re: No spark. Please help
« Reply #8 on: December 30 2014, 11:51:29 AM »
Can you do the paper clip thing on the ALDL and see if you have any codes (bulb pulse) or not to at least tell the ECM is alive?
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

Offline Drivehard

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Re: No spark. Please help
« Reply #9 on: December 30 2014, 12:03:50 PM »
Yes. I left a wire for that sort of test.  This may sound dumb but I go to positive with on side and to pin 5 with the other correct? I don't have the actual ALDL
« Last Edit: December 30 2014, 12:37:20 PM by Drivehard »

Offline daveismissing

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Re: No spark. Please help
« Reply #10 on: December 30 2014, 01:30:03 PM »
The paper clip thing pulls it to ground I believe
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

Offline daveismissing

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Re: No spark. Please help
« Reply #11 on: December 30 2014, 02:23:50 PM »
D5 is CCCI bypass?
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

Offline daveismissing

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Re: No spark. Please help
« Reply #12 on: December 30 2014, 02:57:45 PM »
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

Offline daveismissing

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Re: No spark. Please help
« Reply #13 on: December 30 2014, 05:05:30 PM »
Quoting Jim Testa:
3) If the car didnt kick, I'll yank a plug wire and see if I got spark. If I got no spark, then I'll check also for inj pulse using a noid light. If I have neither its usually due to a dead crank sensor. If I have no spark, but I have injector pulse, its usually a module.

-'course you have a couple more variables in here...
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

Offline TexasT

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Re: No spark. Please help
« Reply #14 on: December 30 2014, 06:26:02 PM »
When you say module, what are we talking? The module under the coil pack?
Rich

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