on my 89 305 tbi camaro....when I turn the key on....then crank it...the injectors spray(to start it) then it dies....I go to re-start...and it starts right up...then dies quickly agan. Now, if I pump the gas pedel while I start it...I can keep it running...by reving it, but it will die If I try to let it idle. Are you guys thinking its the control module thats doing this..or fuel pressure regulator, or bad gas??? this car has sat unstarted for a long time...and I'm getting her all fixed up and back on the road....and this is one of my final hurdels....I do know a few years back the fuel pump was replaced with a G.M. replacement, and is getting fuel to the tbi just fine. and with ignition on the injectors are getting voltage...have not checked pulse yet.

 

Unless you have an injector test light it would be kinda hard to check if the injectors are getting pulses, but if they are firing while cranking they should be fine.

How long has it been sitting and did you put some stabilizer in the tank before the long time?

I wouldn't necessarily look at the ICM since you said the injectors are firing. But do the continue to fire? Have a buddy or someone look at the injectors while your cranking and then when it starts up momentarily.

 

It wouldn't hurt to rent a fuel pressure tester and check your feed line pressure. A dying pump will still provide fuel to the TBI unit but it won't be at the necessary pressure to keep the engine running. Stock GM replacement pumps are often not very reliable. I would look at an aftermarket Walbro, or Holley unit.

 

ok, I'll have someone watch the injectors...and try to get a noid light....the car sat probably 5 years or so(in a garage temp somewhat controled)gas tank drained)untill a year ago...so thats how old the gas is in it now 1 yr.....right b-4 that I had the fuel pump put in by G.M. mechanic and had them keep the old one in the box....I still have it...its g.m. but yea it could hav-benn-a-lemon

 

ok, I made a noid light...and hooked it to the injector plug....and started the car up....at first it "flashed" then as the motor ran it quit flashing....till it sputtered and died...then it quick monemtairly "flashed again.......if I start it and pump the gas it will "flash" just enough to keep the engine running....so this means its only getting injector pulse at start upand if I really pump the gas WOT.....as the engine runs(if someone sprays starting fluid to keep it going) the noid light quits flashing.....till they stop and the car dies...then its one quick "flash"
so....do you guys think this is a control module/pick up coil issue...

 

I swapped the control module out and still no luck...it was a junk yard part...but the car was wrecked so I figure it still works..I'll take to autozone and test it I guess...anyone think the pick-up coil could be doing this??

 

Yes, it could be the pickup coil. The vibration from the running engine could be causing the coil to intermittently open. This would also cause spark issues. With the way the injectors act it could also be along the lines of the ignition module, ECM, or possibly a wiring issue.

During cranking the distributor and ECM are in bypass mode. Meaning that the timing is fixed at initial timing. The injectors are being fired at every distributor reference pulse (DRP).

Once running the ECM switches the ignition module into non-bypass mode. This has the ECM controlling the timing. The ECM will fire the injectors alternately at each DRP. At this point I'd say the ECM is either losing the DRP signal from the ignition module, or within the ECM after the mode change. This causes the injectors to stop firing.

By pumping the gas the acceleration enrichment comes into play. This fuel is injected 80 times a second and is separate from the injection sync'd to DRP's. This allows the engine to stay running.

RBob.