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94 suburban converter lockup in and out.
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sstue
New User
Sep 15, 2009, 4:18 AM
Post #1 of 5
(1711 views)
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94 suburban converter lockup in and out.
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94 Chevy Suburban 7.4L 4L80E w/282,000 miles. Have replaced converter lockup twice with aftermarket and oem. Traced wiring and fault codes , the only code retreived is the idle air controle. The tranni shop put the first lockup soliniod in, my repair shop the second. My repair shop said it could be difficult to trace down, they said start with the idle air controler.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 27, 2009, 9:30 PM
Post #2 of 5
(1692 views)
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Re: 94 suburban converter lockup in and out.
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That's a ton of miles which alone may not be the issue. Is the engine ok, up to date with routine maintenance? There are repairs for high mile engines that won't be listed in an owner's manual. Got the T-shirt!
T
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sstue
New User
Sep 28, 2009, 4:15 AM
Post #3 of 5
(1685 views)
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Re: 94 suburban converter lockup in and out.
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Motor is in great shape. Change oil every 2500 to 3500 miles, and never have to add a drop between. I have noticed that the converter seems to have rythem. You dont notice it going down hill but I can still see the tach move. Also when I try to pass someone it acts like it has know idea what gear to shift into. I have drivin it this way for two years. Must be one tough tranni. Im beginning to think its a computer problem.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 28, 2009, 8:10 AM
Post #4 of 5
(1680 views)
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Re: 94 suburban converter lockup in and out.
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Do you have a good history on this? That's a ton of miles but not the end for that motor. Things like timing chains don't go that long IMO and if never done it needs checking.
Open book - other techs here may have some ideas.
Vacuum testing can be helpful at idle and at raised idle like 2,000 or so -- post results. If not while acting up results won't help much,
T
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Yoda
New User
Oct 1, 2009, 7:04 PM
Post #5 of 5
(1661 views)
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Re: 94 suburban converter lockup in and out.
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Sounds like the tranny shudder I had with my high-mileage '95 SHO. Tranny shop offered to tear the tranny down and replace the lockup solenoid for "only" $2200. I balked. Turns out it wouldn't have done any more good than it did it your case. Members of the SHOtimes Club advised me to replace the battery cables. Bingo! Insufficient current to the solenoid. Who woulda thunk?--Yoda, The Great White North. 
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