I thought it would, I found that the ground strap coming off the head must have been real hot because it melted through some plastic near it. So i put a 2 gauge cable there to the firewall and tested the car in crank with the noid light. No change, still no light during crank except for when im just letting off the key it will flash once. The light will glow nicely once the car is running.

oh well, back to the drawing board.

 

I had the same problem a few minutes ago. Look at your battery connections...maybe a fuse or fuse link has bitten the dust. I found the problem with mine after cussing at it for an hour. I was getting a fleetying flash of the SES when I turned the key on, and nothing when I turned it off.

 

Hey Pablo, is there any way you can check to see if the ecm is getting the pulse reference from the distributor? I suppose if you put the carb back on it runs fine. I had a problem with a non starting issue and it turned out to be the distributor module.

Steve

 

the car is currently carbed and runs great. I replaced the module too thinking that could be it. Didnt fix anything.

 

Hey pablo did you ever try a different ecm? After all that you have gone through I can't help but wounder if the FP transistor or trace is burned up.

 

well ive tried the two ecms I have

 

Did you try a different PROM?

 

btw its not a no fuel pump problem its a no injector fire problem

yes ive tried different proms


I could always retrace my steps and try again though i suppose but it seems like ive done everything atleast twice

 

I know how frustrating this can be, I battled it for a week. Your problem sounds so much like my problem it isn't funny. Have you had some one crank the car while you listened to the fuel pump? Just to make sure it isn't being cut during crank? If that isn't the problem then it has to be wiring related, or both your ecm's have crapped.

 

This has happened to me very recently. In fact...too recently.

 

Painless Performance makes wire harnesses for varying types of GM FI systems.

Here's a quote from their website:

I've just installed my fuel injection system and engine turns over but it won't start. What do I do? Watch the "Check Engine" light. If it stays off, or goes off when the ignition is in the "start" postion, the pink/black wire needs to moved to another power source. This wire must be hot in the start and in the run position or the car may never start. We suggest using the coil feed circuit.

 

pablo. do this, take the ref pin off the ignition module and ground it with a jumper wire. watch for a noid light. also listen for fuel pump priming. If you in fact get a noid light and fuel pump priming you have a dead module.

Have you check the injector circut with a pinpoint test back to the ECM IE: unplugged the injectors and unplugged the ECM and tested for continuity between both points.

Have you checked for vbatt+ on the other side of the injector. With all the ground in the world you might not have any juice to send to vbatt+.

Heres a another way to ensure the ECM works.

Take a test light. Hook it to the ECM side of the circut use the pointed probe end. Then attach the aligator clip end to the battery. If you get a flicering light during crank and no injector firing the problem is in the vbat+ to the battery or power up relay connction. This problem is so simple to trouble shoot im wondering why your stil doing it.

4 cuases

bad memcal ( vats/eprom error)
bad ICM
BAD ECM
No vbat+ on the injectors

Thats it.

 

Are you sure the ECM has a good ground? Without a good ground, the injectors won't fire. There is an easy way to check this. With a voltmeter, check the 5V source to the TPS with meter grounded to the negative battery terminal. If you measure anything other than 5V, you have a bad ECM ground.I troubleshot the exact same problem on a friends TBI truck for 3 hours before he told me he had replaced the thermostat right before it quit. The thermostat housing is where the ECM was grounded and he put way too much gasket sealer on it.

 

I would also add to this list the possibility of the ECM being lied to by a defect else where...

 

I'm not sure if you guys read his other thread or not but the car will run fine once it starts. It's just during cranking that it won't fire the injectors. He does have voltage to the injectors during cranking, it just a matter of not having fuel pressure or the ecm not telling the injectors to fire during crank.

My car did the same thing and I found a burnt trace in my ecm. Soldered it up and it works fine.