91 speed denstiy TPI. well it only happens occasionaly. cold, hot dont matter, everyone once in awhile itll occasionaly just miss. and then sometimes the whole pass. bank will just lose injector pulse. nothing at all. then itll all of a sudden just come back on, sometimes itll come right back on and somtimes its takin almost 10 minutes or so. im just lost and afraid to drive my truck any kind of distance. Thanks

 

I would start with the injector fuses. Then check the injector feeds at the ECM. Sometime the pins get a little beat out and become intermittent.

On a stock '91 TPI all eight injectors are driven from the same driver in the ECM. However, each bank of 4 injectors has it's own wire from the ECM.

Then each bank of 4 injectors has it's own fuse.

RBob.

 

ah i didnt know about the fuse. where is this thing at??

 

damn thing did it to me again... any help on where that injector fuse is?

 

Uh, in the fuse block. Drivers side under the dash.

RBob.

 

o ok thats to easy... i figured itd be an inline or somethin hard to find. but if this dont work would ya say change the comp out?