HELP, injector won’t spray
#1
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Car: 1990 Chevy 1500
Engine: 5.7 350 TBI
Transmission: 700r4
HELP, injector won’t spray
I have a 1990 c1500 5.7 350 TBI, when I got it it had a crack in the tbi and sprayed fuel out the side. I just put a brand new TBI on and new injector wires/connector. Ran good this morning after I put it on both injectors sprayed. Then when I was leaving work I noticed the power loss got home and sure enough one injector wouldn’t spray. The driver side injector sprays, I swapped the connectors and it stayed the same driver side sprayed while passenger did not. Replaced all fuses. Still has this issue anyone have an idea what’s wrong?
note: new TBI came with new injectors in it
note: new TBI came with new injectors in it
#2
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Re: HELP, injector won’t spray
I have a 1990 c1500 5.7 350 TBI, when I got it it had a crack in the tbi and sprayed fuel out the side. I just put a brand new TBI on and new injector wires/connector. Ran good this morning after I put it on both injectors sprayed. Then when I was leaving work I noticed the power loss got home and sure enough one injector wouldn’t spray. The driver side injector sprays, I swapped the connectors and it stayed the same driver side sprayed while passenger did not. Replaced all fuses. Still has this issue anyone have an idea what’s wrong?
note: new TBI came with new injectors in it
note: new TBI came with new injectors in it
One thing not mentioned in your post was SES Light Codes? Example, Code 44 (runs lean when one injector dies).... Got any? Or you just notice a "loss of power"? How about your RPM guage when this issue occurs? Does it go crazy jumping around?
Here's what's in my GMSM for the 5L TBI
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Dwoodard (06-16-2022)
#3
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Re: HELP, injector won’t spray
The driver side injector sprays, I swapped the connectors and it stayed the same driver side sprayed while passenger did not. Replaced all fuses. Still has this issue anyone have an idea what’s wrong?
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Dwoodard (06-16-2022)
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Car: 1990 Chevy 1500
Engine: 5.7 350 TBI
Transmission: 700r4
Re: HELP, injector won’t spray
Hello! While I know nothing about a "1990 c1500 5.7 350 TBI"... I know a HECK of a lot about 1 of 2 TBI Injectors Spraying. This happened to and still happens with my 1992 Camaro RS with the 5L TBI. My issue was narowed down to likely an electrical wiring grimlin I believe after following ALL the troubleshooting you mentioned and having the EXACT same symptoms, I even swapped ECM's.
One thing not mentioned in your post was SES Light Codes? Example, Code 44 (runs lean when one injector dies).... Got any? Or you just notice a "loss of power"? How about your RPM guage when this issue occurs? Does it go crazy jumping around?
One thing not mentioned in your post was SES Light Codes? Example, Code 44 (runs lean when one injector dies).... Got any? Or you just notice a "loss of power"? How about your RPM guage when this issue occurs? Does it go crazy jumping around?
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Car: 92 Camaro RS
Engine: LO3
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Re: HELP, injector won’t spray
You can see if the injector clicks with a bit of a ringing sound when touched to a good 9 volt battery .If it does nothing it's bad
#6
Re: HELP, injector won’t spray
One injector doesn't spray. He swapped the injector wire harnesses, and the SAME injector still doesn't spray.
That eliminates EVERYTHING except the non-spraying injector. If it was the harness or the ECM/injector driver, the other injector wouldn't spray when he swapped the harnesses.
An ohmmeter could tell you if the injector solenoid winding was open. Compare resistance of the dead injector to the resistance of the working injector. If the winding tests good with the ohmmeter, the injector has to come out to verify that the screen isn't plugged. (A plugged screen would be exceedingly unlikely.) In that case, the injector "guts" are apparently seized.
I've seen injectors that were pulled off of vehicles, and stored for a long time. The remaining gasoline turned to varnish, and "stuck" the injector. I had one like that, engine ran like crap for five or ten minutes before that injector freed itself and began spraying. Has worked fine for many years since then.
But an injector that worked for awhile and then stuck...sounds like dead meat, to me. I think you're gonna need a different injector. Got a warranty on that "new" throttle body?
That eliminates EVERYTHING except the non-spraying injector. If it was the harness or the ECM/injector driver, the other injector wouldn't spray when he swapped the harnesses.
An ohmmeter could tell you if the injector solenoid winding was open. Compare resistance of the dead injector to the resistance of the working injector. If the winding tests good with the ohmmeter, the injector has to come out to verify that the screen isn't plugged. (A plugged screen would be exceedingly unlikely.) In that case, the injector "guts" are apparently seized.
I've seen injectors that were pulled off of vehicles, and stored for a long time. The remaining gasoline turned to varnish, and "stuck" the injector. I had one like that, engine ran like crap for five or ten minutes before that injector freed itself and began spraying. Has worked fine for many years since then.
But an injector that worked for awhile and then stuck...sounds like dead meat, to me. I think you're gonna need a different injector. Got a warranty on that "new" throttle body?
Last edited by Schurkey; 06-19-2022 at 03:07 AM.
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