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No fuel, no spark, no start

k20

k20

3/4 ton status
Joined
Sep 9, 2001
Posts
5,067
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Location
Mineral Springs, NC
Ugh, problems always come in groups. Went out this morning to go to school, truck just spins over. Pulled a plug, it aint wet like its gettin gas, nor does it even smell like fuel. Put a plug in the end of a wire to check for spark, not getting one. Checked all the fuses, they are fine. When switch key on, fuel pumps pressurize the system, I dont understand this. Does temperature sensor affect spark? Im at a complete loss, Ive never had both systems die on me before. More or less a TBI setup out of an 88 burban. The chip is secure in the computer, already checked, be sure it hadnt popped out or something. Help, I have to drive my mothers Liberty until I get it fixed :blush: :blush: :frown1: . Thanks. Chris.
 
Could be your distributor module. I had this problem about a month ago. Cost me $60 though.
 
Check to see if the injectors are pulsing when the engine is cranked. (test light makes this pretty easy)

Lots of things can cause crank no run, but no spark and apparently no fuel sounds like module. If the ECM doesn't get a reference pulse that the engine is cranking, the injectors don't fire. Just check to verify fuel isn't being injected, and that will help find the problem more quickly.
 
Put in new ign module, still no dice. Injectors still no fire, still no spark. What now? :(

Also, if the remote coil was bad, could that cause these problems? Does it have any hand in fuel delivery?
 
Well, even if coil was dead, I don't see how the ECM would have a clue that was the case, and the injectors would pulse. Somethings gotta be stopping the ECM from firing the injectors.

I searched and searched, can't find a post on what an ignition module test is. Apparently Napa and Autozones (some) can test these. Found lots and lots of posts about "new" modules being bad right out of the box though. I just don't like swapping parts willy-nilly.

If you were getting spark but no fuel I'd suspect other things, but with no spark NOR fuel, I can't think what else it could be, although two things can die at once.
 
Replying for k20:


They tested the one that was in my truck, and it was good, but gave me another one to try just in case.
 
could be three things

ignition pickup coil, to swap this need to remove distributor...,
ign. module or a temp sensor (very seldom)
 
hmmmmm..

Check the ECM fuse??--Got 12V at the distributor with the key on?--if its not the module,then the pick up coil or crank sensor (if it uses one) could be the culprit...but I'd try a code scan first,to avoid buying a lot of non-returnable parts.. :crazy:
 
Alrighty, how can I go about testing the pickup coil without removing the distributor from the truck? The ECM fuses are both good, where would I check for 12V at the dizzy at? Im sittin in Zen's room, so I aint got my haynes manual or gm service manual handy to see if those tests are in there. Also, I didnt think the temp sensor affected spark, just the fuel. This is really starting to piss me off, none of my problems are ever the easy stuff. Thanks. Chris
 
just to clearify, there is no such thing as a lot of things that can be wrong. Otherwise, GM would have no way of creating flowcharts in their service manuals.

real way to check the pick up coil is to use a scope. :cool1:


I will be able to access Alldata tomorrow, if you still are having issues. I can send you a bunch of stuff to read.

check out autozones website too, they have repair manuals online and usually wiring diagrams.
 
Why do I always get the damn weird problems? Ended up being the neg batt cable.......wtf...........thanks for the help guys. Chris
 
So was there ANY indication that you had a ground issue other than the symptoms you described? (hard to crank, etc)
 
Well yesterday in all the testing I killed the batt. This morning, threw the charger on it, charged it up, then when I hit the key this morning, it was slow spinning. I have a fair assortment of spare parts, so threw another neg cable on it, spun over and started......

Baber, aint it the truth. I get the weirdest issues known to man.
 
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