Strange transmission issue
#1
Strange transmission issue
1. Yes ive searched as well as i can
2. yes ive tried to diagnose the issue myself logically
Thank you for your time! Here we go:
Specs:
1998 Land Rover Discovery
80k miles
Issue:
I will describe the full scenario. Suppose you are on a strip of road and you are sitting wiht the gear selector in park, engine running. You then move the gear selector to Drive and release the brake and apply the accellerator. NO Movement. HOWEVER, if you move the gear selector to 1 and accellerate, the car moves. If you "manually" shift from 1, then 2, then 3, then Drive, (and back down again to restart after stopping) the car will drive and operate normally. Reverse also works normally. Fluid level is normal and smells/feels/looks uncontaminated and good. No check engine lights.
Thank you VERY much in advance for any insight!
2. yes ive tried to diagnose the issue myself logically
Thank you for your time! Here we go:
Specs:
1998 Land Rover Discovery
80k miles
Issue:
I will describe the full scenario. Suppose you are on a strip of road and you are sitting wiht the gear selector in park, engine running. You then move the gear selector to Drive and release the brake and apply the accellerator. NO Movement. HOWEVER, if you move the gear selector to 1 and accellerate, the car moves. If you "manually" shift from 1, then 2, then 3, then Drive, (and back down again to restart after stopping) the car will drive and operate normally. Reverse also works normally. Fluid level is normal and smells/feels/looks uncontaminated and good. No check engine lights.
Thank you VERY much in advance for any insight!
Last edited by moparrebellion; 05-24-2010 at 08:32 PM.
#2
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#6
thank you greg and longhaul
I may be wrong about this, but given the OBDII nature of the vehicle, wouldnt I get a "Check Engine" light with a misfunctioning solenoid valve (or valve body malfunction in general).
Here is something else, and once again, i admit my newbie status. Hear me out:
The "4 wheel drive selector" (the stubby guy close to the HVAC controls) only moves in a Left and Right fashion. There is no ability, whether slowly rolling in NEUTRAL or stationary in NEUTRAL to move the 4WD selector anyway other than left and right. Is this normal? I DO indeed get an orange "4 wheel indicator" on the gauge cluster when i move it to the LEFT
any more insight?
Here is something else, and once again, i admit my newbie status. Hear me out:
The "4 wheel drive selector" (the stubby guy close to the HVAC controls) only moves in a Left and Right fashion. There is no ability, whether slowly rolling in NEUTRAL or stationary in NEUTRAL to move the 4WD selector anyway other than left and right. Is this normal? I DO indeed get an orange "4 wheel indicator" on the gauge cluster when i move it to the LEFT
any more insight?
#7
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#9
Haha,
I can NAIL this one.
ZF 4HP22.
Bad Sprag clutch.
Here is the proof:
I have a 4sp ZF, when I select "D" the vehicle won't move, when I select "1" the vehicle moves off. I can then select "D" and continue to drive normally. If I stop I have to start in first again. Why?
A sprag clutch has "inverted" and will need replacing. No further damage will occur if you continue to drive but you will need to select "1" every time to start moving. A rebuild is required to correct this.
From this site:
Ashcroft Transmissions - 4HP22 FAQ's
Slam! Dunk! Done.
I can NAIL this one.
ZF 4HP22.
Bad Sprag clutch.
Here is the proof:
I have a 4sp ZF, when I select "D" the vehicle won't move, when I select "1" the vehicle moves off. I can then select "D" and continue to drive normally. If I stop I have to start in first again. Why?
A sprag clutch has "inverted" and will need replacing. No further damage will occur if you continue to drive but you will need to select "1" every time to start moving. A rebuild is required to correct this.
From this site:
Ashcroft Transmissions - 4HP22 FAQ's
Slam! Dunk! Done.
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