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Rich Exhaust Code 45

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BigGray89Blazer, Apr 23, 2001.

  1. BigGray89Blazer

    BigGray89Blazer Registered Member

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    does anybody know what could be causing a rich exhaust code 45? Can't keep replacing my Cat every six months due to the fact that the engine is destroying it. I have replaced the Map Sensor, O2 Sensor new cap and rotor, new module (located underneath the Cap on the base of the distrubutor. Any info would be greatly appreciated. It is a fullsize 1989 Blazer 5.7 L V8 with 300,000 Miles on it to date
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    Is your choke operating properly? I would also check the egr and PCV valve.

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  3. timebomb1602

    timebomb1602 1/2 ton status

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    its am 89 so it has tbi

    <font color=red>1991 GMC Jimmy 350tbi 3.42</font color=red>[​IMG]
     
  4. HarryH3

    HarryH3 1 ton status Author

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    300K miles? Wow! Anything and everything could be worn out on that rig! [​IMG] Bad fuel pressure regulator or sticking injectors are a couple of things that come to mind.

    Hooking it up to a real-time data scanner could help diagnose what's going on. Checking the block learn numbers and the integrator numbers would let you see if the computer is actually trying to correct for the rich condition. It would also let you see the TPS numbers in real time to see if it's telling the computer that the engine needs more fuel than it really needs.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
    It's a great day to be alive...
     
  5. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>Your ECT could be telling the computer the motor is cooler than it is. Check the vacuum hose on the fuel pressure regulater to see if it has fuel in it and check the vapor canister too. There shouldnt be any liquid fuel in it.</font color=blue>

    [​IMG]
     

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