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POLL Ignition Module or Fuel Pump??

Discussion in 'The Garage' started by k5freak44, Mar 23, 2006.

?

Fuel Pump or Ignition Module needs replacing?

  1. Ignition Module

    3 vote(s)
    75.0%
  2. Fuel Pump

    1 vote(s)
    25.0%
  1. k5freak44

    k5freak44 1/2 ton status

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    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???
     
  2. 88Silverado

    88Silverado 1/2 ton status

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    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.
     
  3. k5freak44

    k5freak44 1/2 ton status

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    i was told that because i have tbi that i cant do a standard oressure test on the fuel line
     
  4. opfor2

    opfor2 1/2 ton status

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    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.
     
  5. mike n

    mike n 1/2 ton status

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    Plugged catalytic converter, maybe?
     

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