98 Trans Slip ONLY after decelerating?!
#1
Pit Crew
Thread Starter
98 Trans Slip ONLY after decelerating?!
So my wife has a 98 LS and reported to me that the car was acting weird when shifting. So I took the car for the entire day and confirmed that it shifts perfectly through all gears when accelerating but if you are say in traffic and slowing down and re-accelerating (typical stop and go traffic) the car will rev slightly (slip?) when going from 1st to 2nd gear.
I can make it happen every time but only in the above scenario. Any ideas or similar experiences and feedback would be appreciated.
I can make it happen every time but only in the above scenario. Any ideas or similar experiences and feedback would be appreciated.
#3
In what gears? Its flaring when shifting up. Sticky shift valve, solenoid, low line pressure, dirty screen, old fluid, just some things I can think of. Then theres the ecu stuff. Address what brybo86 says first then let us know how its going. How many miles on it?
#4
Moderator
Believe it or not, it's often caused by the clogged throttle body and the air mix passage. It's not caused by the transmission.
There are many 98-00 owners who suffer that. Search the Forum and you'll find them.
Here's an example.
https://www.clublexus.com/forums/ls-...ml#post8906720
There are many 98-00 owners who suffer that. Search the Forum and you'll find them.
Here's an example.
https://www.clublexus.com/forums/ls-...ml#post8906720
#5
Pit Crew
Thread Starter
Believe it or not, it's often caused by the clogged throttle body and the air mix passage. It's not caused by the transmission.
There are many 98-00 owners who suffer that. Search the Forum and you'll find them.
Here's an example.
https://www.clublexus.com/forums/ls-...ml#post8906720
There are many 98-00 owners who suffer that. Search the Forum and you'll find them.
Here's an example.
https://www.clublexus.com/forums/ls-...ml#post8906720
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#9
Lead Lap
iTrader: (1)
Yesterday, I took off the intake plenum assembly and sprayed/wiped down the inside of the throttle body. I then took off the plate just above the TB opening (2 brass screws) and it was CAKED with sludge. I sprayed the area, including down each hole on either side (putting the straw down the hole as far as possible) and then wiped down everything, including the underside of the plate.
I now have a car that works perfectly. Consistent idling and low speed behavior, no more tranny "slippage". My daily drive through the parking garage is much more pleasant.
I even identified a couple of hoses that had become split and is probably affecting MPG.
Thanks, gang!
I now have a car that works perfectly. Consistent idling and low speed behavior, no more tranny "slippage". My daily drive through the parking garage is much more pleasant.
I even identified a couple of hoses that had become split and is probably affecting MPG.
Thanks, gang!
#10
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Join Date: Nov 2014
Location: Cardiff, South Wales, UK
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out of interest which hoses are gone, as it could be them causing problems too, mine has the same idle and low speed behavoir, i cleaned my TB and the air pass when i got the car, but to no avail, it only idles properly when the AC is on.
Last edited by alien1974; 06-23-16 at 09:06 AM.
#11
Lead Lap
iTrader: (1)
The other one is on the right side of the air chamber, near the front by the intake air section, The nipple has actually broken off the air chamber, so I am going to try some PVC cement on that.
#12
my 98 does this as well.
It seems these 5-speed transmissions up-shift very quickly.
Toyota Type IV tranny fluid is new, new filter as well
I've cleaned my throttle body and air mix path and have seen minimal results so far.
Maybe it has something to do with shift valves & solenoids getting old/going bad?
It seems these 5-speed transmissions up-shift very quickly.
Toyota Type IV tranny fluid is new, new filter as well
I've cleaned my throttle body and air mix path and have seen minimal results so far.
Maybe it has something to do with shift valves & solenoids getting old/going bad?
#14
Moderator
The Techron only cleans the fuel passages. It has no capability to clean the air mix passages. Simply do as MngreLMatt has done.
#15
Moderator
Yesterday, I took off the intake plenum assembly and sprayed/wiped down the inside of the throttle body. I then took off the plate just above the TB opening (2 brass screws) and it was CAKED with sludge. I sprayed the area, including down each hole on either side (putting the straw down the hole as far as possible) and then wiped down everything, including the underside of the plate.
I now have a car that works perfectly. Consistent idling and low speed behavior, no more tranny "slippage". My daily drive through the parking garage is much more pleasant.
I even identified a couple of hoses that had become split and is probably affecting MPG.
Thanks, gang!
I now have a car that works perfectly. Consistent idling and low speed behavior, no more tranny "slippage". My daily drive through the parking garage is much more pleasant.
I even identified a couple of hoses that had become split and is probably affecting MPG.
Thanks, gang!