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TBI dumping to much fuel?

Discussion in 'The Garage' started by wayne, Jul 28, 2002.

  1. wayne

    wayne 3/4 ton status

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    On the 90 we just got I just pulled the plugs thinking they were oil fouled on the one cylinder due to a bad valve guide but it turnes out by the looks of it they are fuel fouled. Inside the TBI looks like it is dumping to much fuel in. Any ideas on what to do? Should I get another TBI or rebuild the one I got? The plug I thought would be oil fouled has some oil on it but not enough to foul it.
     
  2. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    might wanna check the fuel pressure regulator
     
  3. jc71355

    jc71355 1/2 ton status

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    Just a Guess but maybe the O2 sensor is sending the wrong signal to the computer and sending too much gas into the engine. Let us know what you find.
     
  4. BurbinOR

    BurbinOR 3/4 ton status

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    Also check the spray pattern of the injectors..........if they are dirty/clogged they'll need cleaned. Check the TPS also...........and the O2 sensor IAC may also be at fault here........
     
  5. fr8train

    fr8train 1/2 ton status

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    I am thinking the O2 sensor too. TPS went up in mine and it ended up bogging down and then desieling on me.
     
  6. wayne

    wayne 3/4 ton status

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    If the O2 sensor was bad wouldn't I get a code for it? I guess it can't hurt to replace it.
     
  7. fr8train

    fr8train 1/2 ton status

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    Really depends. When was the last time you disconneceted the battery? I figured out that if you let it warm up to operating temp. then mash the poo out of the throttle a bad one will light up the check engine light.. ....did take a few runs for mine to come on. /forums/images/icons/tongue.gif
     
  8. BurbinOR

    BurbinOR 3/4 ton status

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    </font><blockquote><font class="small">In reply to:</font><hr />
    If the O2 sensor was bad wouldn't I get a code for it?

    [/ QUOTE ]

    No. That is the misunderstood part of FI.............drivability problems rarely result in codes being thrown. I always suggest getting a scanner (like one from www.autoxray.com ) to diagnose both code problems and non-code drivability issues.
     

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