strange project idea with series 1 3800 - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-14-2013, 06:29 AM   #11
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I hope I'm not premature with this post but...I think I got it figured out. I've got the vats module (complete with resistor in line), the start enable relay, the computer, half of the under hood fuse box and a push button rigged up. I just tried it and I've got spark. What do ya think? Great success? Lol
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Old 08-14-2013, 07:09 AM   #12
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spark is not cut in vats, fuel injector pulse is. if you hook up a test light ground to the pos cable check the injector wire. one should be hot all the time and the other is a ground pulse from the pcm
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Old 08-14-2013, 08:15 AM   #13
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Hmm this is what happens when you stay up all night playing in the shop, I guess I get ahead of myself. Haha. I checked with a test light and didn't get anything then I checked with my multimeter and got 12.3. I then tried putting the test light on with the meter and it immediately dropped to zero volts. Do you suppose that means anything other than I messed up?
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Old 08-14-2013, 02:21 PM   #14
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Well I had to leave to go do chores at the farm but I came back and checked over everything again with fresh eyes and I think it all checks out, thanks to jwfirebird for that tidbit
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Old 08-14-2013, 05:22 PM   #15
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not sure on colors or anything but both wires could test 12v but only one will be ground pulse so if you put a test light, ground hooked to +12v and the probe hooked to one or the other injector wire you should get a flash when cranking
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Old 08-22-2013, 11:40 AM   #16
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Well from what I can tell I have successfully fooled the security system and I do have spark but still no injector power. I would suppose that I either don't have all the necessary wires hooked up or maybe I killed the computer. Any suggestions on my next course of action?
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Old 08-22-2013, 12:10 PM   #17
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hook up the obd port and a light for ses. then you can jump pins a and b and see if there are fault codes
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