TC Lock up
#1
Teching In
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Join Date: Apr 2006
Location: Peoria, IL
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TC Lock up
My '99 Sierra with 124K will go in and out of lock up while cruising at 55mph. There is no shudder, just a 150(approx) rpm drop and rise about every 20 seconds. It seems ok at 65 and >. Can I bypass the lock up with a toggle switch for my 16 mile daily commute to work? If so does anyone have a schematic?
#9
11 Second Hall Moniter
iTrader: (22)
Are you sure it's the TC locking/unlocking? You might be feeling the A/C compressor turning on and off while you're driving. If you have a scan-tool available, you can moniter it to find out. Otherwise, try the same drive with the A/C fan switch turned off to see if it still happens.
#10
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I have no trouble codes, fluid isn't terribly old but is full, A/C is not cycling. I will change fluid and filter then get it on a Tech II as soon as I can borrow one and see what is going on.