964 Turbo - Cuts out in hard corners

[Russellquirk]

My 1992 964 Turbo drives well but has a problem.

Whenever I take a hard corner (90 degree or so) at speed, the car momentarily cuts out. Literally just for a second and the dash lights illuminate like it would if it had stalled (which in effect it has).

It happens only occasionally then is back to running greet in a second but I can replicate it on the same corner over and over again. It’s only when the car is pulling some ‘G’ and also happened once when I went over a dip in the road when accelerating hard.

Seems electrical? It doesn’t splutter so may not be fuel related?

It’s driving me crazy (no pun intended).

Any thoughts on a remedy?

Car has covered 45,000 miles and was stored for 10 years.

[944 Man]

First: all earth straps.

[Russellquirk]

Thank you. Don’t suppose you have a link to where they are on the car?

[944 Man]

Sorry, no.

[Russellquirk]

944 Man said:

Sorry, no.

Thanks anyway

[944 Man]

In my experience, where something like this has happened, it has always been the main braided earth strap which has deteriorated. They are a consumable and it is quite common. It first happened to me in an Uno diesel: a bump / corner combo caused a momentary power loss, followed by the glow plug light coming on (which made it FAR easier to diagnose).

[Russellquirk]

944 Man said:

In my experience, where something like this has happened, it has always been the main braided earth strap which has deteriorated. They are a consumable and it is quite common. It first happened to me in an Uno diesel: a bump / corner combo caused a momentary power loss, followed by the glow plug light coming on (which made it FAR easier to diagnose).

Cheers.

[spikeyhead]

The earth strap is a likely candidate, but I had a Mini that used to do this years ago, and it was a spark plug breaking down.

[stephenjkoch]

Russellquirk said:

Thank you. Don’t suppose you have a link to where they are on the car?

There are two earth's one in frunk from negative terminal to chassis. Easily accessible from frunk. Second is from starter motor to body. It is accessible from underneath by gearbox on drivers side. I've just changed out both of mine 964 c4.

[stephenjkoch]

I'd also swap out dme if you haven't already to rule that out as it causes similar issues to the one you describe when the solder cracks.

[Russellquirk]

Thanks, appreciated. Do Turbos have a DME?

[944 Man]

Im guessing that he means the DME relay. The DME is the ECU. Bosch Digital Motor Electronics.

[stephenjkoch]

944 Man said:

Im guessing that he means the DME relay. The DME is the ECU. Bosch Digital Motor Electronics.

Yes dme relay. You can see a pick of what they look like once you take black cover off here on rennlist and how they fail

https://rennlist.com/forums/964-forum/1196604-do-y...

The dme relay in question is in the frunk fuse box. There are three similar relays in there and the cover should tell you which is dme relay.

[944 Man]

DME Relais printed on top will help. Buy one with a 993 part number - the older 944 parts are inferior. Avoid the cheapo Vauxhall/Opel ones because whilst theyre electrically and mechanically similar, they do not seem to last very long.