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Runs rough, check engine light on.

Discussion in 'Technical Chat' started by drifter, Dec 7, 2011.

  1. drifter

    drifter [OP] moderately modded

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    Ok so I was just driving my 99 4cylinder prerunner. I punched the gas and the tranny seemed to jump back a forth a lil bit...more than usual. After that, my truck has this terrible shudder at lower rpm's. Also, the check engine light is on. At higher rpm's the light begins to flash.

    The taco is letting me down...What could this be?
     
  2. chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    FlimFlubberJAM
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    4.10 gears, sliders, lots of buttons, and yellow flashing lights on the dash.
    What code is it telling ya?
     
  3. whippersnapper02

    whippersnapper02 Well-Known Member

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    Flashing means a misfire. Get a code reader to see what the light is for.
     
  4. drifter

    drifter [OP] moderately modded

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    um I don't know what the code is. I'll need to get a reader right?

    A misfire? I guess it could be worse...
     
  5. whippersnapper02

    whippersnapper02 Well-Known Member

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    Go to the parts store, borrow a code reader, plug it in to the OBD 2 port, get the code and look up the code if the reader doesn't tell you what the code means.
     
  6. slo13zx3

    slo13zx3 Well-Known Member

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    maybe a tps
     
  7. sir1123

    sir1123 Tacomas FTMFW!!!!

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    dont run to long if misfire...might end up burnig cat....did this on my jetta gli
     
  8. drifter

    drifter [OP] moderately modded

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    I had to drive it around 40 miles after it started. I'll look into it further in a day or two. Thanks for the advice.
     
  9. bobg03

    bobg03 Well-Known Member

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    Simple check, open the air cleaner box and check the filter....a mouse chewed my brothers and the scraps from the critter chewing ended up on the maf sensor, caused the same problems.
     
  10. 90YotaPU

    90YotaPU The Messiah

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    I would say the mass air flow sensor. Are you running an aftermarket filter such as k&n? They usually mess them up. Happened twice on my 99.
     
  11. drifter

    drifter [OP] moderately modded

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    All right, I called up the locas Napa and...they don't even have an obd scanner in the store.

    I'll take a look at the air filter. No, I don't have an after market filter.
     
  12. 90YotaPU

    90YotaPU The Messiah

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    it's still possible for that to go bad with the age of the truck. keep us updated.
     
  13. drifter

    drifter [OP] moderately modded

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    $37 later a local shop diagnosed it as needing new plug wires. I wasn't going to spend big bucks to have them do something simple like that so I will buy new wires and replace them tomorrow. I did, however, check the resistance on the wires. All but one were 0.xxx K. One read higher than 1.0 K. I sure hope that the problem is with the wires. If not I'm gonna be PO'd.
     
  14. drifter

    drifter [OP] moderately modded

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    $39 for new Napa plug wires. Gonna install in a few minutes. This better work. I just did that test where you unplug each plug wire while the engine is running and cylinder 3 seems to be the problem.
     
  15. drifter

    drifter [OP] moderately modded

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    All right, new plug wires was what it needed. I learned something out of this, and saved money by doing it myself. Now I'll know to check the plug wires if something isn't running right :D

    Thanks for the help guys.
     
  16. drifter

    drifter [OP] moderately modded

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    Oh yea, now I need to reset that ECL...
     
  17. sir1123

    sir1123 Tacomas FTMFW!!!!

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    glad that all worked out :)
     
  18. drifter

    drifter [OP] moderately modded

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    me too :)
     
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