tbi issues....1990 5.7
#1
tbi issues....1990 5.7
I am having issues with my tbi.....I have spark,new icm,ecm,esc mod,throttle positioning sensor,fuel pump,in line filter,but I am not getting fuel to injectors....took injectors out and tested in another chevy truck they are fine....put noid light on them an no pulse.....help me....ps the truck will start if i pour gas down throttle body.....what am i missing???
#2
So it's your fuel delivery system.
When you turn the key from off to the first position do you hear the fuel pump kick on? It should whir/buzz for 3-4 seconds.
There is a fuel pump relay on the firewall. There are also two fuses for the ECM/Fuel pump on the fuse block.
When you turn the key from off to the first position do you hear the fuel pump kick on? It should whir/buzz for 3-4 seconds.
There is a fuel pump relay on the firewall. There are also two fuses for the ECM/Fuel pump on the fuse block.
#6
Using stock TBI base vs. bored unite
I tried a bored TBI unit on my K5 with 355 engine. I have a costume chip burned for my engine combination and the chip came with a high volume pump and high pressure spring for the pressure regulator. The engine is healthy with Dart 180 SHP heads, mild elgin cam, 9.8:1 compression.
The bored unit is very hard to seal and I ended up using JB weld to seal around the bores. When they bore the unit out the sealing area is about 1/16" thick, no good. I epoxied the unit to my adapter plate to make a good seal.
Idle is bad "loopy", but when I get on it engine screams.
I went back to my stock base TBI with injector pods and aftermarket spring/pressure regulator.
Idle is far better, and all around driving is better.
Unless you are beating the hell out of your engine or have a wild setup, stay with a stock TBI with better injectors and/or high pressure spring.
Good Wheeling.
The bored unit is very hard to seal and I ended up using JB weld to seal around the bores. When they bore the unit out the sealing area is about 1/16" thick, no good. I epoxied the unit to my adapter plate to make a good seal.
Idle is bad "loopy", but when I get on it engine screams.
I went back to my stock base TBI with injector pods and aftermarket spring/pressure regulator.
Idle is far better, and all around driving is better.
Unless you are beating the hell out of your engine or have a wild setup, stay with a stock TBI with better injectors and/or high pressure spring.
Good Wheeling.
#7
I am having issues with my tbi.....I have spark,new icm,ecm,esc mod,throttle positioning sensor,fuel pump,in line filter,but I am not getting fuel to injectors....took injectors out and tested in another chevy truck they are fine....put noid light on them an no pulse.....help me....ps the truck will start if i pour gas down throttle body.....what am i missing???