zebra
Well-Known Member
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since it seems people here lose their minds over adding inquiry to a relevant topic i took the time to search for but saw it hadn't had any responses in a while, here's my new thread...
our 09 3.7L started randomly throwing P2135 & flagging REDUCED POWER mode, STAB/TRAC SYS FAIL messages, etc. while normally a daily driver, it sat for a few days while my wife was out of town - which coincided with a pretty cold snap (consistently in the teens). i started it up the other day to warm up, and when i came back 5min later, it was loping hard at 1500rpm like it had a dead cylinder or something. i plugged up the scan tool & saw the TPS code (A/B voltage mismatch). i cleared it out just to see what happened, and the idle instantly settled to normal & smoothed out like nothing was ever amiss.
fast forward 15min as i'm driving to work - same issue. pulled into a parking lot, cleared, and drove just fine for another day & a half.
after messing with TB connectors, battery terminals, modulating the gas pedal, etc. in the parking lot, i couldn't manually duplicate the problem. sometimes acts up while driving; sometimes acts up sitting still... can't nail down a pattern to it.
is this the dreaded "try replacing all you want, but you're gonna end up buying a throttle body" problem? and if so, has it actually been confirmed that the 4.2L throttle body is the same size as the 3.7L? they have two different part numbers, but it might simply be because the plug is in a slightly different spot... that said, it's a popular mod in the 2.9L Colorado world. if i have to buy another one anyway (and it's actually bigger), seems like now'd be the time to do it... granted i'd have to also do something about that retarded 2.5" neck-down at the airbox where the MAF plugs into the tube for it to amount to a hill of beans.
thoughts or other suggestions? luckily, i can manage with it for a couple days before i go out of town on a work trip - meaning she can drive my truck in the mean time, but i'd like to have her rocking & rolling shortly after i get back.
our 09 3.7L started randomly throwing P2135 & flagging REDUCED POWER mode, STAB/TRAC SYS FAIL messages, etc. while normally a daily driver, it sat for a few days while my wife was out of town - which coincided with a pretty cold snap (consistently in the teens). i started it up the other day to warm up, and when i came back 5min later, it was loping hard at 1500rpm like it had a dead cylinder or something. i plugged up the scan tool & saw the TPS code (A/B voltage mismatch). i cleared it out just to see what happened, and the idle instantly settled to normal & smoothed out like nothing was ever amiss.
fast forward 15min as i'm driving to work - same issue. pulled into a parking lot, cleared, and drove just fine for another day & a half.
after messing with TB connectors, battery terminals, modulating the gas pedal, etc. in the parking lot, i couldn't manually duplicate the problem. sometimes acts up while driving; sometimes acts up sitting still... can't nail down a pattern to it.
is this the dreaded "try replacing all you want, but you're gonna end up buying a throttle body" problem? and if so, has it actually been confirmed that the 4.2L throttle body is the same size as the 3.7L? they have two different part numbers, but it might simply be because the plug is in a slightly different spot... that said, it's a popular mod in the 2.9L Colorado world. if i have to buy another one anyway (and it's actually bigger), seems like now'd be the time to do it... granted i'd have to also do something about that retarded 2.5" neck-down at the airbox where the MAF plugs into the tube for it to amount to a hill of beans.
thoughts or other suggestions? luckily, i can manage with it for a couple days before i go out of town on a work trip - meaning she can drive my truck in the mean time, but i'd like to have her rocking & rolling shortly after i get back.
