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  #1  
Old 03-14-2010, 05:22 PM
peo peo is offline
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4.8is 55plate gearbox probs help!!!

hi guys im still having problems with my gearbox when the car has really warmed up, ie, jumping gears the odd clunk, it only dose it when the car is really hot, could it be gearbox oil???
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  #2  
Old 03-14-2010, 07:59 PM
ard ard is offline
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have you checked fluid level?

Oil doesn't 'fail' in the normal sense of the word... It doesn't go bad and cause the car not to move, or to clunk, or to miss-shft. It does loose it's ability to protect other parts and THAT causes failures...It does get contaminated with grit and grim, from deteriorating friction plates, and THAT will get stuck in the valve body and cause issues.

For these reasons I recommend regular fluid changes BEFORE issues appear. Once you see issues it is too late to hope a fluid change will fix it.... usually.

Check the fluid level. And how hot is "really hot"???
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Old 03-14-2010, 09:57 PM
peo peo is offline
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when you have been on a run say 30 mins or so, the strange thing is thou if u switch the ignition off then on the problem goes away untill another 30 mins goes by garage cannot find anything wrong ecu etc.
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Old 03-14-2010, 10:03 PM
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So "30 minutes" is "normal operating temperature" in my book....

Has the garage ACTUALLY CHECKED the fluid level?

Is the garage running full GT1 diagnostics for the tranny or just looking for error codes with a generic OBD computer?
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Old 03-14-2010, 10:10 PM
peo peo is offline
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i dont think they have checked oil levels but they did ask me if i had seen any leaks on my drive, as for ecu checks i havent got a clue all i know is that they said no faults were showing!!!
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Old 03-14-2010, 10:30 PM
ard ard is offline
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Trouble shooting cars is like medicine.

Your outcome is, unfortunately, greatly affected by the skill of the doctor/mechanic. This is true everywhere.

If you do not take personal responsibility for you own health/car, you are subject to chance.

Time to drill down on what they have checked, how and why....

My 2 cents.

A
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Old 03-14-2010, 10:43 PM
peo peo is offline
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thanks for the info and advise i will do some digging into what they have done, not done thanks again ard.
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  #8  
Old 03-15-2010, 02:01 AM
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JCL JCL is offline
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While it would be a reasonable idea to check the oil level in the automatic transmission, the fact that it has more problems hot (and not cold), and that turning off the ignition temporarily resolves it, tends to suggest it isn't the oil level.

I would be asking them to do more investigation into the electronic controls for the transmission. The control box can be temperature dependent, and may have a fault.
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Old 03-15-2010, 11:02 AM
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thanks for that jcl i agree with you.
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