No reverse when cold

MarceloSuzuki · Jun 8, 2015

Hello everybody.

I have a XJ 4.0 auto 1998, since last month my tranny start to delays to shift reverse when cold.
Now, reverse don´t engages until fluid reach 150ºF.
Can someone help me?

joejeep92 · Jun 8, 2015

Well, as rubber cools it contracts, you have rubber parts inside your transmission like o-rings and seals. Your transmission operates with hydraulic circuits therefore, if that o-ring or seal contracts to the point of not sealing a passage or directing fluid flow the correct way, you get problems. Same principle can apply to metal, specifically in the valves of your valve body.

old_man · Jun 8, 2015

An old trick is to run a cup of lacquer thinner in the ATF. It softens the rubber and makes things seal up better.

MarceloSuzuki · Jun 15, 2015

If I remove and clean the valve body, the plates/gaskets must to be replaced? If yes, Where Can I bought them?

MACH90XJ · Jun 15, 2015

Condition of fluid ? old burnt fluid will cause some problems too. Any problems with forward gears ? Proper fluid level check. Motor running, fluid up to temp, then check fluid level.

MarceloSuzuki · Jun 15, 2015

MACH90XJ said:
Condition of fluid ? old burnt fluid will cause some problems too. Any problems with forward gears ? Proper fluid level check. Motor running, fluid up to temp, then check fluid level.

Level ok.
Fluid is light brown. I'm thinking to do a flush the transmission fluid.
When cold, transmission only change to 2nd when engine rev up, or I take the foot off the gas.

MACH90XJ · Jun 15, 2015

MarceloSuzuki said:
Level ok.
Fluid is light brown. I'm thinking to do a flush the transmission fluid.
When cold, transmission only change to 2nd when engine rev up, or I take the foot off the gas.

Light brown is burnt in my book. A nice bright red hopefully when you get that old stuff flushed out. Pretty common with XJ's with the high underhood temps. I installed a drain plug on my tranny pan.

After you know the fluid is good, test your TPS also.

MarceloSuzuki · Jun 15, 2015

MACH90XJ said:
Light brown is burnt in my book. A nice bright red hopefully when you get that old stuff flushed out. Pretty common with XJ's with the high underhood temps. I installed a drain plug on my tranny pan.

After you know the fluid is good, test your TPS also.

I´ll change all fluid and test again.
Tps is new.

No reverse when cold

MarceloSuzuki

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joejeep92

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old_man

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MarceloSuzuki

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MACH90XJ

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MarceloSuzuki

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