996 engine noise

[daniel obrien]

hi i have a 1999 996 carrea 4s on 80,000 miles i brought it last july with a noise. in 4/5 gear at 1000/1200 revs i put my foot down and a grinding noise happens, i took it back to the garage and they said they relaced the tourqe converter with reconditiond one , 3 cluches and front propshaft this made the noise quierter but did not fix the problem then it went to a nother garage but thye could not sort the problem. i took the car to a porsche garage 40 miles away and could not get the car to make a noise, think is was because the car was hot. have you any idea what the problem maybe?

[sportsandclassic]

Hi, your car is a 996 C4 the S is for the transmission tiptronic S, as for you fault it will need looking at by a Porsche specialsit that can rectify auto atic transmisson faults. Who has looked at it so far ?

Oh by the way welcome to Pistonheads.com

Mike

[RDM]

sportsandclassic said:

Hi, your car is a 996 C4 the S is for the transmission tiptronic S, as for you fault it will need looking at by a Porsche specialsit that can rectify auto atic transmisson faults. Who has looked at it so far ?

Oh by the way welcome to Pistonheads.com

Mike

You sure?...surely you can get C4S manuals, the S in C4S relating to the suspension.

[nellyleelephant]

Was there a C4S in 1999?

[911p]

RDM said:

You sure?...surely you can get C4S manuals, the S in C4S relating to the suspension.

Cannot get a 1999 C4S, hence its is a 'C4' tiptronic 'S'.

[sportsandclassic]

Hi, the OP has already said he has had torque converter replaced and his caris 1999 .. C4S came out in 2002 facelift only.

[daniel obrien]

hi mike, thanks for the reply 1 number porsche speclist and 1 transmition speclist has had a look and carried works the transmition guy said that the mercadies get the same problem but they shake and dont make a noise, i have the car booked in with porsche for a service they are going to take alook but said they would put a new gearbox in 6.5k.

[sportsandclassic]

daniel obrien said:

hi mike, thanks for the reply 1 number porsche speclist and 1 transmition speclist has had a look and carried works the transmition guy said that the mercadies get the same problem but they shake and dont make a noise, i have the car booked in with porsche for a service they are going to take alook but said they would put a new gearbox in 6.5k.

Hi, what has mercedes got to do with your porsche? Your gearbox was never in a mercedes? Only later transmissions were derived from a mercedes ml...?

Mike

Edited by sportsandclassic on Sunday 8th January 22:16

[6C4GTS]

RDM said:

sportsandclassic said:

Hi, your car is a 996 C4 the S is for the transmission tiptronic S, as for you fault it will need looking at by a Porsche specialsit that can rectify auto atic transmisson faults. Who has looked at it so far ?

Oh by the way welcome to Pistonheads.com

Mike

You sure?...surely you can get C4S manuals, the S in C4S relating to the suspension.

School boy error Dougie - surprised at you!

[daveyb662]

I have owned MERCEDES that make this vibration and had always wondered what on earth it was. And must have been normal as have had it on 2 or 3 models. Perhaps it is similar to what you describe but unsure...get it checked out by a proper reputable specialist. If nothing seems amiss just keep driving it, unless you notice any problem in the shifting.

[daniel obrien]

thanks for the coments the car is still under Warranty from the garage i brought it from, he has taken the car to these garages, think he new porsche would say replace the gearbox instead of repaire

[rezza]

Hi Daniel, if you do need to get a new box and have to foot the cost let me know, I have a 2000 c2 manual gearbox that has been refurbed sitting in my garage !! Will need to check to see if the fittings are the same though....

PM me if you are interested
sorry just noticed you have a tiptronic not manual.....

Rezza

Edited by rezza on Monday 9th January 13:37

[Loicpop]

I have the same noise coming underneath the car at low rpm, gear 3 or 4 at the begining and now even gear 2. Live in dubai, I went to some porsche specialists in dubai (ARM, house of car and finally porsche dealer). All different diagnostic : could be drive front shaft or rear differential and the worse gear box it self. All or course ask huge amount to fix the pb. Went finally in cheap garage dealing with old porsches, and the diagnostic is torque converter to be changed\repaired. The garage proposes to do the job with a very low price but without guaranty to fix the pb. Garage is not descent, and I do not trust it. Any advice? I have seen Daniel obrien post, did solve the issue finally

[Loicpop]

Problem resolved: converter repaired and overhauling of the gear box. The result simply fantastic, I have recovered my Porsche. Cost 2000 €

[cardigankid]

Was that done by the dodgy garage you didn't trust, and do you trust them now?