POLL Ignition Module or Fuel Pump??

[k5freak44]

I think im close, after replacing the fuel filter, EGR. Idle Control Sensor, and Throttle Body rebuild, i have decided i either need to replace my fuel pump or ignition module. I also checked the timing and its fine. Still havent checked for codes tho.

Ive got a 91 TBI 5.7 and the idle on it is in and out like its trying to die. When i accelerate is is very slow and seems to try and die while accelerating. Takes like a block to get up to 30 mph.

What do you think???

 

[88Silverado]

CHeck the fuel pressure at the TBI. That should give you a clue if the pump is going bad or the sock on the pump is plugged. I had a similar problem when my fuel filter got plugged but you already changed that.

Its also pretty easy to check if you have a good spark. Just have one of your friends put his pinky inside a disconnected plug wire while you start it.

 

[k5freak44]

i was told that because i have tbi that i cant do a standard oressure test on the fuel line

 

[opfor2]

i was told that because i have tbi that i cant do a standard pressure test on the fuel line

Yes you can. You have to test the fuel pressure at the fuel filter on the passenger fuel filter. You'll need to use a TBI fuel pressure tester kit like the Actron III CP7817F. I bought mine on E-bay brand new and I paid 1/2 the price than retail.

See http://www.actron.com/product_detail.php?pid=16175 for TBI fuel pressure tester kits.

 

[mike n]

Plugged catalytic converter, maybe?