tranny cant decide what gear to stay in.
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Joined: Dec 2003
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From: United States
TRy this, worked for me; Remove the battery terminals and clean them and coat them with terminal grease or high pressure grease and reassemble. Then get a can of Throttle body cleaner and contrary to popular belief, you can do this with the tb on the truck, the gunk going into the combustion chambers will pass right through and not hurt a thing. Spray the tb really well and use a small brush, hold the butterflies open and scrub inside and out. Then start and drive the truck.
Yes you can clean the tb better off the truck for this purpose, on truck cleaning is fine.
Yes you can clean the tb better off the truck for this purpose, on truck cleaning is fine.
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Joined: May 2011
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From: GA
I replaced the ignition coil (Duralast) today and wanted to replace the distributor cap but got too frustrated with it and gave up on it. I'll just pay someone to do that for me. 
Since I had the air filter housing off I tried cleaning the thing like Randy stated excepted I didn't have a brush. I didn't have any of the grease to put on the battery posts.
After I got everything back together I took it for a drive. The shifting improved but I noticed (felt) it shifting down a little hard and made a clunk sound when I came to some of the stop lights. A couple times it shifted a little late IMO (higher RPMs than usual before shifting). The shifting, in general, felt a little lite again except for what I all ready noted.
On a side note I noticed the engine noise through my CB radio, while receiving, decreased a lot.
Since I had the air filter housing off I tried cleaning the thing like Randy stated excepted I didn't have a brush. I didn't have any of the grease to put on the battery posts.After I got everything back together I took it for a drive. The shifting improved but I noticed (felt) it shifting down a little hard and made a clunk sound when I came to some of the stop lights. A couple times it shifted a little late IMO (higher RPMs than usual before shifting). The shifting, in general, felt a little lite again except for what I all ready noted.
On a side note I noticed the engine noise through my CB radio, while receiving, decreased a lot.
Last edited by garam; May 27, 2011 at 08:57 PM.
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Professional
Joined: Aug 2010
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From: utah
so recently i've replaced plugs, coil, wire, cap, rotor, cleaned the hell outta my throttle body and components, new tps, speed sensor and tstat, and as if its magic my tranny problems are gone. i have overdrive 100% of the time, it doesnt downshift whenever it pleases, its not running through the gears too fast or anything. can anyone make sense of this for me cause honestly i cant see how any of it is related other than maybe the speed sensor. its only been a day but i will be keeping an eye on it for awhile.
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Joined: May 2011
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From: GA
Nice!
Now if it runs great for two plus days then you probably fixed it.
Mine would run great soon after I replaced one of those parts then start acting up again. I still have to get a TPS and the cap, I all ready bought, on it.
Now if it runs great for two plus days then you probably fixed it.
Mine would run great soon after I replaced one of those parts then start acting up again. I still have to get a TPS and the cap, I all ready bought, on it.
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Joined: May 2011
Posts: 104
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look back to my first post on this thread. I've seen transmissions go into full limp mode over a bad engine sensor.
A good running engine versus a bad running engine, assuming all sensors are correct in both, are going to have very different readings,which is going to affect the load scales. Changes engine timing and fuel along with shift patterns to keep the computer happy concerning the calculated load of the engine for a given speed.
A good running engine versus a bad running engine, assuming all sensors are correct in both, are going to have very different readings,which is going to affect the load scales. Changes engine timing and fuel along with shift patterns to keep the computer happy concerning the calculated load of the engine for a given speed.
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Joined: Jan 2011
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The cable probably isn't the problem, but to adjust it correctly you need 2 people. You have to hold the lever on the trans full forward, while somebody else at the throttle body adjusts the cable. Your looking for instantanious movement of both the trans tv lever and throttle for a stock setting.
A good tune-up on the motor is a good place to start, or at least someone to scan the computer with live data to pick up on anything irregular. The trans is shifted by the computer via load inputs from the motor. The trans side of things is torque sensing.Therefore running condition as far as your sensors are concerned greatly effect shift timing.
The only thing I don't see here, is how it is shifting from 1st to 3rd. These transmissions are good for dropping on line pressure with high mileage, which will cause fast shifting,up and down shifts and so on. "gear hunting"
You would have to adjust the regulator valve,on the valve body to raise the pressure. The OD issue is more likely to be the 3-4 shift accumulator,that is providing you are going in and out of OD and not just torque converter lock-up.
In that case,the lock-up solenoid could be to blame. Another thing to check, is the governor sensor. When you pull the pan,it's one of the first things you spot other than the filter on the valvebody. Remove the 4 torx screws holding it in and gently work it out,unplug the wire and thoroughly clean it if any buildup is found in the screen, or trans side mounting hole.
A good trans shop could get you on your way in a hurry.The only other possibility would be a bad OD piston seal,making it loose pressure and drop out of gear.An air test would be needed to verify everything hydraulic is working correctly. This requires dropping the valve body.
A good tune-up on the motor is a good place to start, or at least someone to scan the computer with live data to pick up on anything irregular. The trans is shifted by the computer via load inputs from the motor. The trans side of things is torque sensing.Therefore running condition as far as your sensors are concerned greatly effect shift timing.
The only thing I don't see here, is how it is shifting from 1st to 3rd. These transmissions are good for dropping on line pressure with high mileage, which will cause fast shifting,up and down shifts and so on. "gear hunting"
You would have to adjust the regulator valve,on the valve body to raise the pressure. The OD issue is more likely to be the 3-4 shift accumulator,that is providing you are going in and out of OD and not just torque converter lock-up.
In that case,the lock-up solenoid could be to blame. Another thing to check, is the governor sensor. When you pull the pan,it's one of the first things you spot other than the filter on the valvebody. Remove the 4 torx screws holding it in and gently work it out,unplug the wire and thoroughly clean it if any buildup is found in the screen, or trans side mounting hole.
A good trans shop could get you on your way in a hurry.The only other possibility would be a bad OD piston seal,making it loose pressure and drop out of gear.An air test would be needed to verify everything hydraulic is working correctly. This requires dropping the valve body.
awesome thanks alot for all of this should be quite helpfull
look back to my first post on this thread. I've seen transmissions go into full limp mode over a bad engine sensor.
A good running engine versus a bad running engine, assuming all sensors are correct in both, are going to have very different readings,which is going to affect the load scales. Changes engine timing and fuel along with shift patterns to keep the computer happy concerning the calculated load of the engine for a given speed.
A good running engine versus a bad running engine, assuming all sensors are correct in both, are going to have very different readings,which is going to affect the load scales. Changes engine timing and fuel along with shift patterns to keep the computer happy concerning the calculated load of the engine for a given speed.
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Professional
Joined: Aug 2010
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From: utah
tps was not my problem i replaced that by itself and the rest on another day and it still had problems. been since sunday and its running great!
it didn't work right until i swapped the throttle body for the spare one i had and cleaned up, along with the iac.
it didn't work right until i swapped the throttle body for the spare one i had and cleaned up, along with the iac.
Last edited by jasonw; Jun 27, 2011 at 02:25 PM. Reason: Merging double posts.
