MKS_Performance

We thought we would give a little heads up for any of you who may still have the older DME/Fuel pump relays in their 85 1/2 > 944's, 964's and 993's

If you still have the old relay in your car, replace it ASAP. These relay's can fail suddenly, cause intermittent rough running or bucking. Any time we get a car in the shop that still has the old part ( 944.615.227.00 ) PIC, we highly recommend replacing the part.

New part number: 993.615.227.01

OLD (Bad relay)

TMc993

Is this a "new" type of failure or the same one that has been discussed on this forum about every other week for the past 10-12 years?

MKS_Performance

You'd be surprised how many people still don't know about this.

996scott

is it just a matter of taking the old one out and putting the new one in? Do you have to disconect the battery or reset anything?

MKS_Performance

Yes. No need to disconnect the battery or anything else.

177mph

I just carry a spare...

bart1

As do I. And I have a new 993 part number relay in my 968 which ittermittantly gives me problems.

Z-nomore

I was not previously aware of this issue. I am going to take a look at mine and see what version it is.

TMc993

Even if you get the "new" version, the fail rate on this part is pretty impressive (Do a "SEARCH" on words like "won't start," "stalling," "relay," etc. to get an idea). The best approach is to familiarize yourself with the location of the relay and keep a spare in your onboard toolkit. Replacement is a 5-minute task. There is also a test procedure that involves a three-wire jumper that can be useful in determining if your fuel pump relay has failed. SEARCH is your friend.

Slow Guy

What do you do with the other 4 min.?

Many of us also remove the relay when the car hasn't been started in a few weeks (or you just changed the oil) and turn the engine over for 10 - 20 sec. to let it build up oil pressure, put the relay back in it's slot, then start the car.

IXLR8

Talk about scare tactics! Gawd, there is a shop I'd trust.

Do you even know what fails on them? And do you with 100% certainty think the replacement won't fail for the same reason?

There is nothing wrong with the old original relay that some simple soldering of the relay board won't make it as reliable as can be.

In case you've never popped the cover on a DME relay...DME Relay - Failure and Repair

f3nr15

Another tip: a fellow enthusiast recently managed to crack the underlying electrical board when replacing his relay. Therefore, do it with GENTLENESS.

Allen

Definitely one of the most useful posts ever...nice work...and thanks...

IXLR8

Glad I might have saved you some $$$ seeing how these have shot up in price.

I re-soldered my spare and new "993" DME relay as well, although I highly doubt I'll ever need it after after re-soldering my original "944" relay.

freeman

Not to be neurotic or paranoid.............but, years ago when I discovered my original DME and my spare had a 944 part number prefix, I bought a new one with a 993 prefix.

Now I have two spares and the original is still functioning.