I just put tbi back on my car after like a 2 year absence. The tbi unit was sitting with fuel in it (as i discovered when i picked it up and fuel leaked out) I surmised that this might be bad since i imagine it might have gummed up the injectors.

I bolted it on anyways and cranked it, no fuel except when i let off the key it will squirt once or twice. I managed to get it started like this and it runs fine once its running. Spray pattern looks good. If i shut it off though i have the same problem and it wont start.

My best guess was that from sitting the injectors got sticky and require alot more voltage to fire now. This would explain why as i let off the key and the power wasnt being drained by the starter for that split second the engine was turning the injectors would fire, and why they would fire just fine when i did get the engine running.

Could that be the case or am i missing something?

Just in case I set the injectors in some carb cleaner hoping that fixes it, any other ideas?

 

i played with it some more and it seems almost like more of an electrical problem than anything. Seems like the only thing getting power in crank is the starter and the exterior lights, not sure though

 

Hope you get it running. I'd like to see how far you get with TBI.
BTW, I got new tires and have somebody paying my way to the track. It had better not be closed and it had better now be raining or I'm going to open up my own drag strip.

 

Awesome J, do you have it tuned with the WB? You dont want me to turn a better et than you! hehe

This problem is REALLY starting to **** me off

This is what I know so far

the large pink wire is supposed to be hot in everything from run to crank. Seems like it powers the coil and the injectors.
I put a test light at the inj fuse block with a seperate ground than from the ecm and I am not getting power in run or crank, I only get a small flash of power as im turning the key toward crank and sometimes when i am letting off the key ill get another small flash

I would diagnose that as a faulty ignition switch but the car started fine with the carb. This means the ignition coil must have been getting power in crank



this schematic shows the rest of the circuit. Still though it doesnt explain why I am getting power only intermittently from the pink wire to the fuse block and why the car will run fine once its started if there is no power to the fuse block when i just turn the key to the run position.

Any ideas?

 

Well, if your pink wire there is also the one that provides voltage to the injector fuse block then it HAS to be at +12v when the ignition sw. is in the "start" and the "run" position. If that is not what it is doing, then that's your problem. Check pin C on your ignition switch. It should be hot during "start" and "run". If not, then the ignition sw is bad. If it is, then there is a wiring problem between the switch and the fuse block.

Steve

 

check your pickup coil in the distributor... that drops out and u have no signal for inj pulse


should roughly measure in the 400 ohm area and not be shorted to grd on either wire

see how the wires looik when u disconnect it from the module they usually break right there where they come out of the coil itself

LAter
Jeremy