Bogs in OD
Thread Starter
Intermediate
Joined: Nov 2015
Posts: 44
Likes: 1
From: Williamsburg VA
Bogs in OD
Thanks for all the info on this board!!! I have been lurking for awhile and it has helped me fix a few issues. This one I can't really find a solution for. I have an '86 automatic and when it is in the OD position it always bogs when I first hit the gas when driving normal speeds. If I stomp on it this doesn't happen but if I accelerate normally when doing around 30 it bog's. There is no clunking noise or any other symptoms. If I put the shifter into D this never happens. Where should I start looking?
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
Put the trans in "D" around town. You are experiencing the wait time for the trans to unlock the converter & shift out of overdrive.
IMHO throttle response sucks around town when in OD, I always used "D" when driving in town when I had the base A4 89 vert.
IMHO throttle response sucks around town when in OD, I always used "D" when driving in town when I had the base A4 89 vert.
Last edited by Churchkey; Jan 5, 2016 at 06:29 PM.
Thread Starter
Intermediate
Joined: Nov 2015
Posts: 44
Likes: 1
From: Williamsburg VA
That's what I have been doing because it is annoying as hell lol.
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Race Director
Joined: Apr 2002
Posts: 10,036
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From: Anaheim CA
I never put the trans into OD unless I'm going faster than 50 MPH.
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
Thanks for all the info on this board!!! I have been lurking for awhile and it has helped me fix a few issues. This one I can't really find a solution for. I have an '86 automatic and when it is in the OD position it always bogs when I first hit the gas when driving normal speeds. If I stomp on it this doesn't happen but if I accelerate normally when doing around 30 it bog's. There is no clunking noise or any other symptoms. If I put the shifter into D this never happens. Where should I start looking?
Oil Producer
Joined: Apr 2014
Posts: 9,371
Likes: 2,736
I have an 1986 and the ECM locks the torque converter way to early in my opinion. It will go into lock-up at 22 mph and that is what cause the bog because the car shifts into overdrive at less then 30 mph and with the converter locked the RPM is less then 1000 and the car has no acceleration until you really push the throttle and the converter unlocks or the transmission downshifts. To solve this problem I changed the chip to raise the lock points of the torque converter in low gears and high gears to suit my liking. I believe I changes them to 42 mph lock points when the car was stock and it worked well.
Bjank is right here. He helped me deal with the same issue on my 85.
My solution, temporarily, was to simply disconnect the tcc lockup solenoid.
The tc never locks up. Which is the way cars were before tc's were invented. the result was that the bog dissapeared. and i lost about 1mpg.
So before doing anything really, I would unplug the harness to the tcc solenoid. Then drive around and see if its gone. Now you know its the tc as bjank has stated.
Then you can decide if you want to change it via a custom chip with different instructions to the tc than on the stock chip.
cheers. VT.
Burning Brakes
Joined: Apr 2009
Posts: 1,228
Likes: 10
From: That one city...you know that one. Idaho
Am I correct in guessing that the in the sentence "Which is the way cars were before tc's were invented." You were referring to a lockup torque converter?
Oil Producer
Joined: Apr 2014
Posts: 9,371
Likes: 2,736
Just for clarification on this, but I'm guessing you are talking about lockup torque converters, and the older ones that don't lock.
Am I correct in guessing that the in the sentence "Which is the way cars were before tc's were invented." You were referring to a lockup torque converter?
Am I correct in guessing that the in the sentence "Which is the way cars were before tc's were invented." You were referring to a lockup torque converter?
Drifting
Joined: Feb 2008
Posts: 1,537
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From: NE Ohio
2024 C4 of the Year Finalist - Unmodified
Instructor
Joined: Apr 2003
Posts: 204
Likes: 9
From: Ocean Springs MS
I had the same problem with my 85. I had a guy on the Camaro board burn a new chip with the lockup set at 50 MPH, and it's perfect. No manual shifting required, and it locks up when you reach highway speed. I have heard that disconnecting the lockup is not a good idea, because it causes too much heat at highway speeds.
Oil Producer
Joined: Apr 2014
Posts: 9,371
Likes: 2,736
do you have an email address or phone number for the person who burned you the chip? I would like to buy one for my 85 for the exact reason you did. Feel free to PM me
I had the same problem with my 85. I had a guy on the Camaro board burn a new chip with the lockup set at 50 MPH, and it's perfect. No manual shifting required, and it locks up when you reach highway speed. I have heard that disconnecting the lockup is not a good idea, because it causes too much heat at highway speeds.
Melting Slicks
Joined: Nov 2010
Posts: 2,216
Likes: 113
From: Michigan
I just shift into D when I want power, you gen more heat like said earlier in non-lock(more under power) and should use an add on cooler or your fluid & trans life will shorten.
Last edited by BOOT77; Jan 9, 2016 at 12:57 PM.
Navigator
Joined: Aug 2013
Posts: 9
Likes: 0
From: Oxnard Ca.
