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  1. #1

    Default Running rich problem

    Hey guys i am new here and not sure if this has been brought up before but i will take my turn asking. I just finish installing a brand new 350 crate motor. I put on hooker headers, magna flow high flow cats, and flowmaster 50 series mufflers. the headrers only had one bung for an O2 sensor. The sensor is a single wire. The truck is running super rich....really strong smell and lots of fuel coming out the pipes...what can i do?????

  2. #2
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    murdog94's Avatar
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    Default

    Year make, model would help a lot.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3

    Default

    sorry forgot that part

    1993 GMC YUKON GT

  4. #4

    Default

    originally it was two into one with a single O2 sensor

  5. #5
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    Coolant temp switch could be bad. You might have a buble un the intake allowing the temp sensor to think everything is cooler than it is. Also Do you have the timing right??
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  6. #6

    Default

    I replaced all of the sensors when i put the new engine in. The timing was set this afternoon....now with that i was told to set it to 0 degrees and the computer would take over the rest. Now i did notice when setting it the timming was a little jumpy when rev'ing it up. the ignition set up is all new Mallory ignition parts.

  7. #7
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    Hmmm... To be honest youve got me.. Is it still a TBI???
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  8. #8

    Default

    yea it is......I wasn't sure if i need to put a second O2 sensor on the passenger side exhaust.....or put a y pipe back it, or what....its got me scratching my head too!!!!!

  9. #9
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    In all reality the O2 sensor shouldnt cause it to run that rich... Did you do a rebuild on the TBI?? when you put it in?? Also did you clean out the EGR??
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  10. #10

    Talking

    Quote Originally Posted by ftms View Post
    Hey guys i am new here and not sure if this has been brought up before but i will take my turn asking. I just finish installing a brand new 350 crate motor. I put on hooker headers, magna flow high flow cats, and flowmaster 50 series mufflers. the headrers only had one bung for an O2 sensor. The sensor is a single wire. The truck is running super rich....really strong smell and lots of fuel coming out the pipes...what can i do?????
    the engine cntrol pc might be looking for that other 02 sensor

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