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  #11  
Old 09-07-2012, 10:07 AM
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You might try buying a coil pack and substituting it one by one through all the cylinders and see if that helps. It may be misfiring but not enough to throw a code. Not a bad thing to have as a spare anyway, at least with a 2UZ-FE...
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  #12  
Old 09-07-2012, 11:17 AM
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Not a bad idea at all Matt, thanks.
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  #13  
Old 09-07-2012, 07:36 PM
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i have 6 coils from a yoda either 3.4 or 4.0 .. i highlly doubt its a coil issue though. does it always misfire or only under load, cold, hot, cruise, highway, city..
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  #14  
Old 09-10-2012, 02:45 PM
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Well, I did a thorough clean of the MAF, the TB, and the intake. Ran some Seafoam through for good measure as well. I read somewhere that there is a "cleaning" procedure for the TPS that involves 100 full-travel cycles of the accelerator pedal. I did that too, figuring it wouldn't hurt anything to try.

The problem is still there, though the cleaning netted me some improved throttle response. I'll take what I can get, I guess.

Tim, I notice that it happens more often than not around 2K or so, generally with light throttle pressure, but sometimes with my foot out of the gas altogether.

I'd say it was the TPS if it didn't do it without any throttle at all. I read a forum post online somewhere with almost identical symptoms caused by slight wear in one of the plug boots (that didn't manifest itself in a continuity check or any other tests). I don't have any heartburn replacing the wires at nearly 100K, so I think I'll head that route first. Haven't had time to put the TPS on the meter, but I'm starting to think that isn't the issue.
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  #15  
Old 09-10-2012, 04:47 PM
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Vacuume leak !
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  #16  
Old 09-10-2012, 06:01 PM
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Looking for one...
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Last edited by bgoodheart; 09-11-2012 at 07:46 AM.
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  #17  
Old 09-10-2012, 10:49 PM
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There are about 4 good ways to check for vac leak
•starter fluid / brake clean / carb cleaner, with truck running and spray
•Vacuume gauge hooked up and watch the needle and #
•smoke the motor with a smoke machine and look for leaks
•watch short trim fuel #'s on scan tool
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  #18  
Old 09-11-2012, 12:19 AM
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Did you go through deep water in ouray? Make sure none of the plug wires are worn or have water under the boots.
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  #19  
Old 09-11-2012, 09:05 PM
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Quote:
Originally Posted by rover67 View Post
Did you go through deep water in ouray? Make sure none of the plug wires are worn or have water under the boots.
thats a good point. pull the plugs, but mostlly check the porclin for cracks and burn through
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  #20  
Old 09-12-2012, 06:08 AM
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This thread describes exactly what my truck has been doing: http://wew.ttora.com/forum/showthread.php?t=13283

I have found no evidence of a vacuum leak, but I have not had the time to troubleshoot the rest thoroughly. I'd be fine with the TPS going bad, but I haven't gotten a CEL, which normally accompanies it. I'm really hoping it isn't the APPS, since the part, unlike the TPS, is only available as part of the complete TB (~$800).

No deep water, but I still need to pull the wires and plugs to inspect. Plugs are only a few thousand miles old, but wires are original.
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Last edited by bgoodheart; 09-12-2012 at 07:20 AM.
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