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Old May 26th, 2011, 09:32 PM   #1
HPICamaroSS
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Default S10 350 swap HELP for Silver Lake PLEASE

Ok guys WE really need some help here. We have a 94 s10 that we did a 350 tbi swap on. we can get the truck to run on starting fluid so we know it has spark. The problem is the injectors are not pulsing (not squirting fuel). And we really need help, we have tried everything we can think of and its getting too late. We are supposed to leave for silver lake in 36 hours. So anyway this is what I know:

We have power to the injectors (key on power)
Fuel Pump is working
We have fuel pressure (we can get the injectors to squirt if we jump them with a power/ground source)
We have spark because the truck will run if we spray gas or starting fluid down the tbi


Some other things to know : The fuel pump is hard wired, none of the gauges work in the truck yet (we are trying to get the motor running first)

Thanks so much for any help, we are really running short on time here and any input we can get is greatly appreciated.
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Old May 27th, 2011, 07:21 AM   #2
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We have also replaced the ECM, and that didnt do anything. Replaced the ignition control module as well.
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Old May 27th, 2011, 08:13 AM   #3
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You may have spark, but it sounds like the computer isn't getting the feedback it needs from the dizzy to know the RPM / when to fire the injectors.
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Old May 27th, 2011, 08:20 AM   #4
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does the computer have constant power? During cranking and during run position? We had that issue on my tj the other night with a tbi 350 in it. Just had to power the comp. Or it sounds like what scooter says. You might not be getting any info from your dis
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Old May 27th, 2011, 09:46 AM   #5
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Quote:
Originally Posted by ScOoTeR View Post
You may have spark, but it sounds like the computer isn't getting the feedback it needs from the dizzy to know the RPM / when to fire the injectors.
Do you know how I can test that? I thought the pulse would be too fast for a meter to pickup
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Old May 27th, 2011, 09:48 AM   #6
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does the computer have constant power? During cranking and during run position? We had that issue on my tj the other night with a tbi 350 in it. Just had to power the comp. Or it sounds like what scooter says. You might not be getting any info from your dis
I do have power to the comp in both positions. And I do have power to the injectors, so i know its a computer/wiring problems because the computer is not sending the signal to ground the injectors to make them fire
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Old May 27th, 2011, 11:49 AM   #7
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Do you know how I can test that? I thought the pulse would be too fast for a meter to pickup
Read a bit here:

http://www.megamanual.com/ms2/GM_7pinHEI.htm
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Old May 27th, 2011, 12:31 PM   #8
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k that helped a little bit. I remember seeing a brownish/tanish wire back there that had been cut, we thought it was a ground because we couldnt find where else it went to. this may be our problem (HOPEFULLY)
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Old May 28th, 2011, 09:31 AM   #9
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Update? We gotta get ya to Silver Lake! :)
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Old May 28th, 2011, 09:49 AM   #10
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Had the exact same thing happen to me on my 89 tbi 350.It was the ground wire that gets grounded to the bolt that holds down the thermostat intake housing.
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Old May 31st, 2011, 01:07 PM   #11
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Update? We gotta get ya to Silver Lake! :)
Well I made it to silver lake in my truck, but we never did get the s10 running. we are prob going to try a different wiring harness, and if that doesnt work, its gettin a carb.
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Old June 1st, 2011, 03:34 PM   #12
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well, like he said.. he was there with his truck, another buddy with his truck, another buddy with his truck, and me with my girlfriends subaru cause we cant get the s10 running.. So if anyone has a harness froma 94 or 95 s10 w/ a tbi, let me know
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Old June 1st, 2011, 10:05 PM   #13
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UPDATE WITH INFO THAT MIGHT HELP WITH IDEAS.. I have tested everywire that i have been told i need power to, and every ground im suppose to have..

FIRST the "pink/white" wire that everyone agrees i need power to that goes to the computer has power..

orange wire at the computer has power,

injectors have power at the injectors, and at the computer when ground in not being applied

Have great spark, as ive said before

Black/red ground from ignition control modual is grounded (tested at ecu)

good grounds at t-stat, and one relocated to accessory bracket

good fuel pressure (brand new fuel pump, witch is hardwired)

I just replaced the original blower motor box with an a.c delete box, and when I did, I traced all the wires of the harness as good as I could... The only broken/ cut wires are a purple one (i think o2 sensor) and a tan one (not sure). it appears to be just tan.

Hope that I can get some more suggestions from this info.

THANK YOU

-Jon-
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