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Chasing a gremlin

Discussion in 'The Garage' started by Shorts, Jun 18, 2003.

  1. Shorts

    Shorts 1/2 ton status

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    how do you know if the tc or the tcc has gone bad? 4l60e. anyway, i've been chasing a gremlin for a while and i'm pretty fed up already.

    cruising the hwy, if i let up on the gas a little on a down hill(to keep a constant speed), feels like something is holding the truck back a little bit, then it kicks /forums/images/graemlins/confused.gif almost kinda like when you go 4wheelin and you leave and put the tcase into 2hi, the front axle is still halfway engaged and the axles catch a bit as your driving off.

    anyway, i've gone through everything i can think of to get the mpg above 9mph on the hwy(342s and 33s) /forums/images/graemlins/1zhelp.gif
     
  2. Shorts

    Shorts 1/2 ton status

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  3. ntaj*ep

    ntaj*ep 1/2 ton status

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    Seven damn pages!!! /forums/images/graemlins/eek.gifI think not......
    Take a manifold vacume reading at idle and at cruise. You should have about 20-22 in/hg. at idle. I think you will find that your Cat. is cloged. /forums/images/graemlins/thumb.gif
     
  4. Shorts

    Shorts 1/2 ton status

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    well i dont have a vacuum reader thingy /forums/images/graemlins/confused.gif the cat was listed as a culprit. i'm just tired of replacing junk and it not fixing the problem
     
  5. Blaze

    Blaze 1/2 ton status

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    I think sunlight will kill them. Just be sure not to get them wet or feed them after midnight. /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    A vacuum gauge is one of those under $10 items that you just can't do without!

    You could remove the cat temporarily and see what happens. If there is a marked improvement in performance and mileage it needs replacing...bolt in a piece of straight pipe in it's place for a few days.

    Rene
     
  7. ntaj*ep

    ntaj*ep 1/2 ton status

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    I have never been a fan of replace it because........I need proof before I do anything. /forums/images/graemlins/thumb.gif
     
  8. Shorts

    Shorts 1/2 ton status

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    i hear ya on that. everything i've replaced was due: tune up, oil change, diff fluids, tranny fluid/filter. and since none of that worked, i gotta dig a little deeper: cat, O2, ig module, ig coil...uhmm what else...

    yes i do need a vac tester and a volt ohm meter - i thought we use to have one....but NOOOOOOOOOOOOOOOOOO /forums/images/graemlins/rolleyes.gif rest assured, those things are already on my birthday list - as well as my xmas list /forums/images/graemlins/grin.gif

    i definitely don't water my gremlins, but i do feed them after midnight. that's my bad habit though - i stay up eating cold pizza and reading posts /forums/images/graemlins/rotfl.gif
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Kind of off topic, but was just reading in the service manual about checking for exhaust restriction at the AIR fittings.

    Dunno why someone would think a problem that you can feel a change in, would be the converter.

    Someone that knows 4l60e's better than me can comment, but I imagine one wire going into the transmission controls TCC, so de-pinning it from the connector (shouldn't be too tough) would disable TCC, and a short drive like that should tell you if TCC is the prob or not.

    And since you are running non-stock tires, have you accounted for the speedometer difference in your MPG calculations somehow?
     
  10. Shorts

    Shorts 1/2 ton status

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    my truck doesn't have the A.I.R. system.

    yeah, my tires are dead on. 33s actually only measure 31.5......and what is stock? 31.5" yeah, thankx BFG /forums/images/graemlins/angryfire.gif anyway, truck acts the same with the 265s as well as the 33s. thats why i'm so stumped.

    i changed to ignition module tonight and went for a spin. the truck responds better, but i'll have to wait and see if it was the full problem.
     

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