1990 G2500 w/5.7 Dies without warning
#1
1990 G2500 w/5.7 Dies without warning
We have a 1990 G2500 van with a 5.7. It dies suddenly. Happens randomly at various speeds. More so when lower RPM's. If I crank it a while it will start back up. I pulled a plug wire while it was turning over to restart it I saw spark( verified three times). I had no gas spraying in the TBFI. If I spray a little carb cleaner in the TBFI it will fire up and stay running. I drove around with the doghouse and air cleaner off and when it would die I saw No gas spraying, but as soon as I sprayed a little cleaner it would fire up (did this many times). What am I missing? It seems like both TBFI's are turning off at the same time and then they turn back on when I spray the cleaner. I don't get it. Haaaalp!
#2
We have a 1990 G2500 van with a 5.7. It dies suddenly. Happens randomly at various speeds. More so when lower RPM's. If I crank it a while it will start back up. I pulled a plug wire while it was turning over to restart it I saw spark( verified three times). I had no gas spraying in the TBFI. If I spray a little carb cleaner in the TBFI it will fire up and stay running. I drove around with the doghouse and air cleaner off and when it would die I saw No gas spraying, but as soon as I sprayed a little cleaner it would fire up (did this many times). What am I missing? It seems like both TBFI's are turning off at the same time and then they turn back on when I spray the cleaner. I don't get it. Haaaalp!
#3
If fuel delivery fails could your fuel pump be going out? I think you can put a gauge on the return line to monitor pressure (someone keep me honest here). Also, if you haven used a TBI rebuild kit in a while they work wonders (if it's not pump related). I removed both injectors in my 305 TBI and cleaned them and noticed a huge difference in how they sprayed afterwards (along with the rebuild kit).
#5
Replaces all gaskets, and fuel regulator. As for TBI, I know it needs a specific pressure / volume from the pump, and I'm sure there's a return line to the tank. Not sure on the specific numbers.
#6
Throttle Body Injection runs about 13-15 PSI from a pump in the tank, which you should be able to hear running.
Did we replace the filter? Is the tank dirty?
These are OBD-1 systems and can be checked for trouble codes by connecting a wire (bent paper clip works) between A and B terminals on diagnostic link, turn ignition on and count flashes of check engine light. It shows two digit codes by flashing each one three times. 12 is normal. They will not give as much information as an OBD-II system does but it can be a help.
Did we replace the filter? Is the tank dirty?
These are OBD-1 systems and can be checked for trouble codes by connecting a wire (bent paper clip works) between A and B terminals on diagnostic link, turn ignition on and count flashes of check engine light. It shows two digit codes by flashing each one three times. 12 is normal. They will not give as much information as an OBD-II system does but it can be a help.
Trending Topics
#8
Thread
Thread Starter
Forum
Replies
Last Post
Oliverc2004
Silverado, Sierra & Fullsize Pick-ups
3
March 21st, 2022 6:32 PM
1985_S-10_Durango
S-10 & Blazer
1
January 28th, 2018 1:38 PM