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Timing?

Discussion in 'The Garage' started by Chaddy, Apr 4, 2006.

  1. Chaddy

    Chaddy 1/2 ton status GMOTM Winner

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    350tbi 90 blaze..... I replaced my plugs,wires, cap and rotor. Repaired a vaccume leak...I think its the only one. But anywhooo My idle is ruff after its all warmed up but drives perfect. If Im sitting at a light, the idle gets low like it wants to die but doesnt. When the idle stutters the oil pressure gets below 30 on the gauge??? Timing?
     
    Last edited: Apr 4, 2006
  2. 1979jimmy350

    1979jimmy350 1/2 ton status

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    are you sure you got all the leaks, you might want to make sure that your idle air valve is working proplery
     
  3. AZ79K5Project

    AZ79K5Project 1/2 ton status

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    I don't know much about the 90's but is the choke openning up OK and the idle set right?

    Have you adjusted the idle mixture screws since the vacuum leak fix? It may be too rich now since you closed some of the extra air entering the system? Is the 90 with the computer controlled idle?

    The only computer in my 79 is when I drive it with my cell phone on my side.
     
  4. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    check for codes.... sounds suspiciously like an egr or iac on its way out..
     
  5. goldwing2000

    goldwing2000 Guest

    '90 is throttle body injection. No choke or mixture screws on TBI.
     
  6. Chaddy

    Chaddy 1/2 ton status GMOTM Winner

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    Bingo. My iac was bad. Now its perfect! Thanx
     

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