Hey all...Think i might have narrowed this down...Car is running like crap and continues to die and not start...Replaced ECM with a remand one and seemed to help the no start for a few days but the past 4 days its getting worse and worse...It has started to die while driving then like 2 seconds later fire back up...But when i shut it down it wont start for like an hour, sometimes longer...When it starts it aint running to good and usually dies and wont start again...Car wont start now so i went and checked the ohms on the injectors...1.6 ohms...I was pretty sure it was the injectors dieing out...I removed the prom with the car on ON yesterday ( forgot to turn it off ) and when i fire it up its running like a champ...Drive about 1/2 a mile and back to normal...Barelly got it home...Then the no start happened again and couldnt get it started till today...Idled for about 2 minutes then died and no start again...So my question is i just ordered a new prom from Pontiac...Could it be the prom causing all these problems? Its about the only thing left that i havnt replaced...TIA

 

Now i am stumped...If i remove the harness from injector #3 the car starts and idles pretty good...I just took it for a ride and the low rpm hesitation is gone but the car feels like its running on 7 cylinders ( makes sense )...If i plug the harness back on the car dies immediatly...Disconnect it and the car fires right up... ...I'm not getting an ohm reading from #1 and #3 injector...I got a reading from # 4 injector for a few minutes...Was bouncing between 15-19.5...Now i get no reading from any of them... ...HELP

 

Ohm out the individual injectors while hot. They need to be between 12 & 16 ohms. The stock Multec injectors usually fail by shorting (low ohms reading). This is a very common occurrence today. They are reaching the age of failure.

Pulling the harness plug from #3 helps confirm this. That particular injector is nearly shorted out completely. When that happens the ECM can no longer pulse the remaing injectors.

RBob.

 

Thanks RBob...Looks like i'll be putting in 8 Motorsport injectors this weekend...Wish i realized this 2 weeks ago when i got the car...2 weeks of replacing everything wasted...Well at least its got a full tune up and a bunch of new sensors now...