2004 Cayenne S won't shift into 4th after valve body change
02-26-2014, 03:39 PM
#1
Track Day
Thread Starter
2004 Cayenne S won't shift into 4th after valve body change
Hi all,
Could do with some input on an issue with my 2004 Cayenne S. Had a minor but annoying problem where the 'auto hold' was dropping out at junctions and giving me no drive when I went pull away, then would suddenly re-engage a gear with a jerk if I added a bit of throttle.
Other issues: once or twice over a few months did not shift down from 5th to 2nd when coming to a halt. Last few weeks could not decide what gear it was in and just sat in D the whole while.
Valve body was chief suspect so I had that reconditioned here in the UK, fitted it and initially had all gears but really clunky shift. Reset adaptations on PIWIS and then no drive in fourth or higher. Suspected valve body so gearbox shop sent another one. Same problem.
I was getting really fed up so went to Porsche and ordered the new part. Now in and, while it is smoother than ever from 1-3, it will not drive above 3rd gear. It shows 4/5/6 on the dash display, no faults coming up but not engaging the gears. Just revs out like a clutch pedal is depressed. As road speed falls, it picks up D2/D3 and continues.
My workshop is experienced with Cayennes - owner has had three and currently runs an 06 Turbo S but this is a whole new thing on him. Latest suggestion is we change the transmission, but I think we are a long way from there at the minute and will keep digging first.
Any thoughts? Anything similar happened to anyone? I have had a good look through the forum and nothing similar that I can find. It was shifting up through the gears quite nicely before dropping the valve body. Maybe a tiny bit clunky on the 4th/5th but the solenoids all tested fine on the valve body recon test rig.
Could do with some input on an issue with my 2004 Cayenne S. Had a minor but annoying problem where the 'auto hold' was dropping out at junctions and giving me no drive when I went pull away, then would suddenly re-engage a gear with a jerk if I added a bit of throttle.
Other issues: once or twice over a few months did not shift down from 5th to 2nd when coming to a halt. Last few weeks could not decide what gear it was in and just sat in D the whole while.
Valve body was chief suspect so I had that reconditioned here in the UK, fitted it and initially had all gears but really clunky shift. Reset adaptations on PIWIS and then no drive in fourth or higher. Suspected valve body so gearbox shop sent another one. Same problem.
I was getting really fed up so went to Porsche and ordered the new part. Now in and, while it is smoother than ever from 1-3, it will not drive above 3rd gear. It shows 4/5/6 on the dash display, no faults coming up but not engaging the gears. Just revs out like a clutch pedal is depressed. As road speed falls, it picks up D2/D3 and continues.
My workshop is experienced with Cayennes - owner has had three and currently runs an 06 Turbo S but this is a whole new thing on him. Latest suggestion is we change the transmission, but I think we are a long way from there at the minute and will keep digging first.
Any thoughts? Anything similar happened to anyone? I have had a good look through the forum and nothing similar that I can find. It was shifting up through the gears quite nicely before dropping the valve body. Maybe a tiny bit clunky on the 4th/5th but the solenoids all tested fine on the valve body recon test rig.
02-26-2014, 05:42 PM
#2
Track Day
Thread Starter
Found potential clue in Touareg training doc: solenoid N88 controls 4,5,6. Needs to be open but stays closed when no power. So checking feed to that when I get time to spend at workshop.
02-26-2014, 06:29 PM
#5
Racer
Automatic Transmissions are an art unlike building an engine. Find yourself an experienced transmission guy.
One time, I had a transmission that would continue to fail, replaced every iunternal part and we could not repair it. Purchase a new external case for a salvage yard, and all was good after that. Sometimes its not the obvious.
One time, I had a transmission that would continue to fail, replaced every iunternal part and we could not repair it. Purchase a new external case for a salvage yard, and all was good after that. Sometimes its not the obvious.
02-26-2014, 06:32 PM
#6
Track Day
Thread Starter
Thanks, got a good auto trans guy. But five laps of the block ago I had six gears, so I am going to try a few other things first. This is engine and transmission out to change it, and that is a big job on a Cayenne!
