I've purchased a spare DME relay to keep in the glove box (as advised in many posts ).

I opened up the fuse box to look at the vintage of my current DME relay, and it has a 944... part code, which from what I understand, is the original DME relay. I've heard that this part was subsequently upgraded to a 993... part.

Question is - should I just bin the old relay anyway?

 

Is the new relay a 993 part number ?
If it is , put that one in and see if it works .
If it works , keep it in place , store the old one .
If the new one stops working you will have an old one to put it until you get another new one .

 

Sorry - I should have said the new one is a 993 code. I'll put that one in today and keep the old one as a back-up.

 

I keep a 3 pronged wire with spade connectors in my glove box as an emergency measure.

My relay failed within 3 months of ownership.

Dave

 

The new relay seems to have made a difference to the idling (for the better). Before, if I approached a set of traffic lights and came to a stop, the idling used to vary up and down for a few seconds before settling. I'd get worried that the car was going to stall. Now the revs just drop straight to the idling speed with no hunting.

I'm not sure if it's related to the DME relay, but things seem better!

 

Put the old one back in for a test ?
Does the funny idle come back ?

 

mmmmm... I put the old one back, went for a drive and the idling is fine. Do these things "reset" or something when unplugged?

 

The DME control unit's idle speed sensor adaptation value is stored in volatile memory so pulling the power will reset it.