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Not firing!!!!

gonner

gonner

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1994 chevy 5.7 tbi. I changed head gaskets now back together turns over but not firing. I have voltage at coil from wiring harness. Should I have voltage going into dist. from the wiring harness and if so on which wire. Thanks for all the help I can get. I do have spray from the TBI as it cranks over.
 
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Come on guys someone on here has to be an electrical guru.
 
Plenty of them. Weekends are a bad time for replies though. Everybody is out breaking stuff to work on the rest of the week.

I'm pretty darn good with electrical, but not as familiar with that part as others. Hang in there, someone will be along shortly.
 
I figured that was the case. Been beating my head on this all afternoon. I did fail to mention that I have spray from my tbi.
 
do you have spark ? i would check to make sure that the dizzy is plugged in and recheck the timing on it
 
Are the injectors spraying fuel?
When the ignition control module fails it can cause a no spark and no fuel issue. What wires should have power, that I don't know.
 
I've seen modules fail to have either spark OR fuel,and or both too...they dont always fail "completely"...sometimes one side still works and the other doesn't.

Most likely if it ran before you worked on it ,its a wire unplugged,or a ground wire didn't get put back?.. or maybe the ECM fuse popped or something?...I'm no EFI guru,so I'm not too much help ,sorry..
 
I have spray at my TBI, engine turns over good. It doesn't lag or spin slow like it's out of time. All of the grounds are connected as far as I can see. Yes it did crank and run before tear down. Don't they have a way to test the modules at Advanced and etc ?
 
I don't trust the off-vehicle module tests. You should be able to google "test HEI TBI module" or some combination of that and find the testing you need to do on the rig.

The manual should cover it as well, 1987-1991 years should all be the same as yours, at least as far as I understand them...just don't rely on wire colors alone: http://67-72chevytrucks.com/vboard/showthread.php?t=545416
 
Ok guys, replaced ignition coil, NO FIRE. Then changed ignition module, NO FIRE. I then ohmed my pick up coil, it test fine. I'm still getting fuel spray while cranking engine. No fire on any plugs. Checked fuses in panel all are fine, even checked with voltmeter. Double checked the firewall ground, the two grounds at front of engine, and the one from battery to engine, all are good and tight. With voltmeter, negative lead grounded at battery, ignition switch on I'm getting 12 volts on red wire from harness to coil. Then on red wire from coil going into dist. I have 12 volts, well alittle under battery was getting weak.
 
Ok guys, I changed ignition coil, no fire. then changed ignition module, no fire. I ohmed the pick up coil and it tested good. I double checked the firewall ground, two grounds on front of engine, and the ground from battery. All are good and tight. Checked all fuses in panel, good. even checked them with voltmeter. Then with ignition switch on I got 12 volts on red wire going into coil from harness and 12 volts from coil going into dist. module. Well maybe slightly lower due to battery getting alittle weak. ???????
 
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I would seriously recheck that the distributor was dropped and timed right. I've dropped way too many to count and have on several occasions missed the correct tooth I wanted or dropped it 180 out.
 
check to bottom of the cap for corrosion and to make sure that all the pins are tight. about the only thing it could be is that or the ignition pickup. since you have fire going to it but nothing coming out.
 
I am going with the distributor being 180 out.

Pull a spark plug out and reconnect it to the plug wire while grounding the spark plug body and then crank. look for spark on the spark plug as you crank.
 
Get some help and see if you have 12 volts to the Dist while cranking after you do the spark plug trick and if you have no spark at the plug.
 
bradshawtech said:
I am going with the distributor being 180 out.

Pull a spark plug out and reconnect it to the plug wire while grounding the spark plug body and then crank. look for spark on the spark plug as you crank.
Click to expand...

I've taken the spark tester oft and doing this as I spin it over. With the ignition switch on. I've even checked other plugs that way and nothing.:dunno::dunno:
 
bradshawtech said:
I am going with the distributor being 180 out.

Pull a spark plug out and reconnect it to the plug wire while grounding the spark plug body and then crank. look for spark on the spark plug as you crank.
Click to expand...

blazer74 said:
Should still do something even 180 out.
Click to expand...

I thought the same, should atleast pop or spit. Atleast the older engines would.
 
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