996 Carrera 2 Gearbox

[Sly74]

Does anyone know how to cure the following problem.

I have a 98 C2 tip, when driving my 911 fairly hard in either tip or auto mode the gearbox is slipping between gear changes when going up through the box. It appears to happen in all gears. Down changing is fine. The gearbox doesn't slip if I do not push it too hard.

Can anyone help?

Thanks

[Richard Hamilton]

Is this a new problem, or has it always done it? There is always a certain amount of slippage until the torque converter lockup clutch locks.

The obvious thing would be to check the ATF level first. Izzy Sanchez did an excellent write-up in the Maintenance Section which shows how to do it.

[Sly74]

Is this a new problem, or has it always done it? There is always a certain amount of slippage until the torque converter lockup clutch locks.

The obvious thing would be to check the ATF level first. Izzy Sanchez did an excellent write-up in the Maintenance Section which shows how to do it.

Thanks Richard for you help so far.

Just to clarify this is a new problem, i have always felt abit of slippage, but this is quite extreme, if I am in 2nd at 5krpm, then change I can red line

it before it changes gear. I am taking the car to my local mechanic tomorrow to check the ATF Level, I am told the car has to be put on a ramp to

check it??

The car is due for a service which I plan to take to Porsche, I just didnt want to pay porsches rates to check the gearbox over if its only a fluid issue.

Do you use Porsche for your servicing?

Phil

[RFM]

Try with new ATF fluid, if there is no result you got an internal gearbox problem with the clutch Assembly's.

[Richard Hamilton]

..........i have always felt abit of slippage, but this is quite extreme, if I am in 2nd at 5krpm, then change I can red line

it before it changes gear. I am taking the car to my local mechanic tomorrow to check the ATF Level, I am told the car has to be put on a ramp to

check it??

It sounds serious to me. Getting it up on a lift makes the job of checking the level much easier. Like RFM, I think it might be worth changing the ATF. I'm no expert on tiptronic transmissions, but it could be clutches, valves, torque converter.......

I use an independent specialist (my best friend, as it happens!) - I wouldn't pay Porsche rates, especially on a 9 year old car, but we are lucky to have lots of choice of specialists over here.

Edited November 7, 2007 by Richard Hamilton

[Izzy]

Phil,

yes, the car has to be up to get to the fill port, and the transmission fluid has to warm and between 30-40 Celsuis I believe. Too cold or hot will create over or under filling. If you have never changed the ATF fluid and filter, it is very likely due.

But also take the car where you can read the codes from the OBDII, a place like Autozone, Pepboys, etc. The transmission will have codes that won't trigger a CEL. If you have codes, come back and post them and we can help you troubleshoot.

It may be the pressure regulators that are not working right, and to replace them is about $220 for parts (I had to do one once). Don't get to the gearbox yet, do the simpler things first, like the speed sensor, etc. But do get the codes if you have any also.

Edited November 7, 2007 by Izzy

[Sly74]

Phil,

yes, the car has to be up to get to the fill port, and the transmission fluid has to warm and between 30-40 Celsuis I believe. Too cold or hot will create over or under filling. If you have never changed the ATF fluid and filter, it is very likely due.

But also take the car where you can read the codes from the OBDII, a place like Autozone, Pepboys, etc. The transmission will have codes that won't trigger a CEL. If you have codes, come back and post them and we can help you troubleshoot.

It may be the pressure regulators that are not working right, and to replace them is about $220 for parts (I had to do one once). Don't get to the gearbox yet, do the simpler things first, like the speed sensor, etc. But do get the codes if you have any also.

I have had the car on the OBDII reader, no fault codes present. I think Its time to find a porsche specialist in Essex (SE England). Any recommendations??

[Richard Hamilton]

Try Autostrasse at Coggleshall - 01376 562922 or HP Motorsports in Hainault - 020 8500 2510

[Sly74]

Try Autostrasse at Coggleshall - 01376 562922 or HP Motorsports in Hainault - 020 8500 2510

Thank you Richard for your help, have you used either of these companies?

[Richard Hamilton]

No I haven't, but I got the details from recommendations from other PCGB members who speak highly of them.

[Sly74]

No I haven't, but I got the details from recommendations from other PCGB members who speak highly of them.

Thanks again, I have booked my car into HP Motorsport as they are closer to my offices. I will post my report once the car

has been returned and the invoice has been settled.

[Sly74]

No I haven't, but I got the details from recommendations from other PCGB members who speak highly of them.

Thanks again, I have booked my car into HP Motorsport as they are closer to my offices. I will post my report once the car

has been returned and the invoice has been settled.

Hi All. Just a quick update. I have just had the car serviced by HP Motorsport. Excellent service, really helpfull people. Definately recommend them

to anyone in the South East England, nr Hainault.

The gearbox slippage was due to the MAF sensor. Now replaced and goes like a 911 should, its never driven so well.

Edited November 26, 2007 by Sly74

[GranburyChuck]

No I haven't, but I got the details from recommendations from other PCGB members who speak highly of them.

Thanks again, I have booked my car into HP Motorsport as they are closer to my offices. I will post my report once the car

has been returned and the invoice has been settled.

Hi All. Just a quick update. I have just had the car serviced by HP Motorsport. Excellent service, really helpfull people. Definately recommend them

to anyone in the South East England, nr Hainault.

The gearbox slippage was due to the MAF sensor. Now replaced and goes like a 911 should, its never driven so well.

Sly, how did you find out it was the MAF? Was there a code that showed up?