[Waylander]

Hi All

 

trying to help a friend here..

 

he has a TIP and the engine starts on the button, select reverse and its fine, select drive and the engine cuts instantly..

 

anybody got any ideas as to the cause..

 

Thanks

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[az968]

try pushing in the clutch first,

 

oops, my bad.

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[Bulti]

ATF fluid level still ok?

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[Waylander]

I will get him to check the fluid


Wondered if might be the micro switches on the gear selector

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[az968]

doesn't sound like AFT. In reading quickly thru the workshop manual for the tip, there appear to be a number of possible causes.  I didn't see this specific problem, although it references a "power flow" problem, but that's probably not the cut off problem. The manual says to first obtain a diagnostic code reading. Can he find a shop with an ODB1 reader? Any fluid leaks noted? Also, there's a strainer in the transmission that might be clogged.

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[Bulti]

Maybe something useful can be found here, especially the NOTE part in the diagnostic section:


http://workshop-manuals.com/porsche/968_...page_1420/

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[az968]

Yeah, emergency operation seems to be what is occurring.  I like on online manual, didn't know there was one around.

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[chuaed]

Did the tiptronic warning light come on when and around the engine gets cut? Could be as simple as a loose ground cable. i had a similar issue a few months ago and turns out it was the ground cable that came loose.

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[Waylander]

the tip warning light does not come on, you could drive it 20 miles backwards and it would be fine, the moment you select a forward gear the engine cuts does not even give the torque converter time to load up.

 

its just like turning the ignition off....

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[Bulti]

Maybe resetting the ECU helps?

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[Waylander]

I have a suspicion its something to do with the micro switches on the gear selector, 

 

as in you cant start in gear or get the key out

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