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05-19-2009, 11:59 PM #1
torque converter clutch "hunting"
i have a question which could be caused by a faulty something or another in the fuel/air monitoring system. my truck, usually when maintaining a speed between 43 and 53 mph, not at any certain rpm, will kinda rev up and down, up and down, up and down... etc, almost like its about to down shift but it doesnt, it just keeps pulsing like that until i mash the gas a little more, and it normally only happens when i am going up a slight-moderate incline. do any of you think it could be due to a faulty O2 sensor, or maybe dirty injectors? or if it is another problem, i will post it in its proper place, but if it is related to a bad sensor then whatever. i also noticed it this weekend when returning from tenn, it did it but not as bad, at around 85 or so2000 silverado with a 5.3l v8, shorty headers, upgraded plugs, 10 mil wires, magnaflow high flow cats, flowmaster 80 series muffler(2 in 2 out) w/ 18 inch stainless silverline tips. i have a k&n CIA. its a 4x4 z71 offroad package. Ls model.
extended cab 160k miles, truxedo low profile bed cover, diablo sport predator tuner.
reman tranny @ 130k miles
05-20-2009, 10:51 AM #2'98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
'92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
"My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World
05-20-2009, 12:37 PM #3
05-20-2009, 02:52 PM #4
05-21-2009, 03:31 PM #5
thanks mr shorty. sorry for kinda changing subject.
06-01-2009, 02:51 PM #6
- Join Date
- Jun 2009
06-01-2009, 06:22 PM #7
Assuming no mechanical problems are present, and you are sure it is just "hunting" the first thing that comes to my mind is a custom tune that changes the PCM's thresholds for locking/unlocking the TCC.
PS extracted these posts from O2 sensor thread and put them in their own thread.
Last edited by MrShorty; 06-01-2009 at 06:25 PM. Reason: moderation information
06-03-2009, 07:18 PM #8
torque converter clutch hunting
Have you tried installing your stock tune back in your truck to see if problems stops?
06-04-2009, 04:42 PM #9
with or without the tune, it still happens. i was hoping that after a tune, it would pan out, but still does it. i am still trying to get a video. i know just the place, just havent had time to go there.
i have been thinking about the scanner thing, i guess i should do that then. i will keep y'all posted.
i did have my scanner plugged in today watching for misfires, at idle, i am showing slight misfires in all cylinders. not all at once, and not every one per cycle. they rarely count over 8 per cycle in 6, 7, and 8, and rarely over 6 counts in 1-5. but per cycle, it might show only 3 or 4 cylinders with misfire per cycle. once i start accelerating, and once i am at a constant speed or rpm, there is no longer a misfire in any cylinder.
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