Question about Isuzu Trooper

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Isuzu bighorn no shifting when the engine becomes hot what is the problem?

Why does isuzu bighorn no shift when the engine becomes hot, but when the temperature is cold we have no problem in shifting.

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2 Answers

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  • Isuzu Master
  • 20,706 Answers

Old post, ill add real
better, a real answer, not ****** spam
automatic trans
cold ATF fluid is thicker cold and thin hot.
the hot oil finds leaks in the trans seals and it fails.
what does no shifting mean
Drive dead.
Reverse dead
or will no auto up shift, 1,2,3,4......?
my guess is it fails the stall test< slips in drive.
step on gas, and RPM goes wild fast RPM
that is called slip. and is stall test failure covered in your FSM book.
it the tells you to do the line press test next.
gage and fittings on side of box
if that fails trans is bad.
takes 30min work to do,
if it does drive in 1st gear, then that is another answer
be clear and get 10x better answers

Posted on Oct 24, 2016

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  • Isuzu Master
  • 7,515 Answers

I, feel sorry for you, after reading your problem, but don't worry you visit the Reliable-Store they will help you for sure.
Isuzu Trooper

Posted on Oct 04, 2016

  • Anonymous Oct 24, 2016

    why spam relic post.

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Posted on Jan 02, 2017

  • 331 Answers

SOURCE: Isuzu bighorn automatic transmission slips after heating

Change your gearbox oil, and clean out the oil strainer.
Should help.

( On some models, you have to remove the gearbox oil pan to clean the strainer )

Posted on Nov 01, 2009

  • 14092 Answers

SOURCE: my 1995 isuzu bighorn need

THERMOSTAT STAYING OPEN CAUSE PCM STAY IN OPEN LOOP WHICH WILL CASE ENGINE RUN POORLY TRANSMISSION SHIFTING LATE.REPLACE THERMOSTAT SEE IF IT HELPS PROBLEM.

Posted on Aug 09, 2011

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1 Answer

Isuzu bighorn first gear good also the reverse gear but can't shift


hi paula
what year?
what country?
what model bighorn, bighorns vary by country.?
what engine?
what transmission , auto or stick shift?

the word gear , is no clue.
if not sure, send photo of truck then of the shifter

sounds like car needs service, no?

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Why isuzu bighorn automatic transmission 4jg2 engine no shifting when engine is hot what is the trouble?


Have you checked the trans oil level correctly when hot? If its OK then you need a trans specialist to carry out various tests with gauges etc

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As in lobotomized, heh heh? That sounds like more reverse-engineering than the makers would put up with. Look under the dash, both sides. I really don't know, surprising if it has no modern electronics.

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My 1995 isuzu bighorn need hard to shift into 2nd gear if the engine is not in peak temperature. I need to step the accelerator up to 2000 rpm before it shift to 2nd gear, but if the temperature goes up...


THERMOSTAT STAYING OPEN CAUSE PCM STAY IN OPEN LOOP WHICH WILL CASE ENGINE RUN POORLY TRANSMISSION SHIFTING LATE.REPLACE THERMOSTAT SEE IF IT HELPS PROBLEM.

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5 Answers

Isuzu bighorn automatic transmission slips after heating


Change your gearbox oil, and clean out the oil strainer.
Should help.

( On some models, you have to remove the gearbox oil pan to clean the strainer )

Nov 01, 2009 | 1994 Isuzu Trooper

1 Answer

Fluid spec problem


FLUID TYPE: DEXRON 4 OR 6, 6 IS THE BEST AND NEWEST FLUID TYPE AND FAR SUPERIOR TO OLDER TYPE 4. DEXRON 6 PROVIDES MORE POSITIVE SHIFTS AND LONGER TRANSMISSION LIFE.

Apr 02, 2009 | 1994 Isuzu Trooper

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The Bighorn auto tran smission is a special transmission with a snow or uphill assist function. When you use this function it will definitely go fast into Overdrive when shifted upwards.

Willy Baguio City
92 Irmsher 3.1

Oct 16, 2008 | 1998 Isuzu Trooper

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