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DME relay

V

vinceg

New member
993 newbie but have read much. Just got my 97 993 C2S. I have read threads of failing DME leaving owners high and dry while out and was told I should carry a spare in glove box always by 1 owner. I actually thought this was an early 993 issue and on later cars pretty much resolved - as much as obviously any such component can fail on any car. Should I definately get 1 for the glove box or not? I have a couple of longish runs planned this year.

vg
 
As I understand it the 993 part numbered DME relay is stronger than previous iterations, but having been stranded in the past, and given the minimal cost, there is one in my toolkit at the moment..

If you have a known serviceable spare, it will also help to eliminate it as a cause of any problems, should anything occur in the future

my 2p [:)]

Pete
 
agree, they never seem to be a problem on varioram 993's, but I still have one in the toolbox as well.......

now if only the oil cooler resistor was that easy to change !
 
Mine went - 1997 varioram - and for the £20 it cost I chucked another one in the spare wheel just in case. Not sure how the different part numbers impact though - I think my replacements were 964 (or poss even 944?) coded.
 
[8|] Hmm as an early 993 owner sounds like I should get one.

Is there a particular part number or type I need to look out for?
 
I had a 1994 993 C2 and it cost me a fortune at the OPC to found out what the problem was (it kept stalling whilst I was driving - very scary). They disconnected the after market immobiliser checked all the electrics and then told me they couldnt find a fault. I eventually traced the cause to the DME, which I bought for £20.

Since then I always kept a spare in the glovebox. £20 is a small price to pay for piece of mind.

This appears to be a very common problem in pre varioram cars, but I'm not sure of newer models. I'm assuming they may have updated the relat as the faulty relay was coded 944!
 
I HAVE POSTED THIS MESSAGE IN A NEW TOPIC, AND AM NOW PASTING IT IN THIS THREAD AS WELL, IN THE HOPE THAT SOMEONE CAN RESPOND TO IT. THANKS.


Need some help here guys. My car produced two problems; (1) at standstill, when accelerating and de-accelarting slowly with first gear, at tick over speed, engine cuts off; and (2) at higher travel speeds the engine cuts off again. The fuel pump and governing relay was changed with new parts. Seems that problem 1 is fixed, although did not experience it enough, because problem 2 has re-appeared, and I am scared to use car in case it gets stuck in the middle of a busy street etc. Can anybody help by providing practical advice, or views as to what he thinks the problem might be, considering that the fuel pump and relay are brand new.
Many thanks.
Mike 100
 
Mike

Unfortunately it could be one of a number of things. If I were you I would get an OPC to read the error codes on their diagnostic computer as a start and go from there.
 
I have a spare also, and mine is a '96. I have found that there is enough space to tape it to the inside of the fuse box lid. It reminds me to try it in case of other problems that I hadn't contemplated being related.
 
Just been out to the garage to check mine. I have a 944. coded DME. IS this strange given its a mid 97 car? Perhaps already been changed - with an older part?

Will aim to get a new/replacement unit sonnest.

Any suggestions on good source for said item?

 
Mike,

Sounds similar to my problem.......this was traced to a faulty O2 sensor. This didnt show on the fault log as the sensor was outputting a voltage (-0.45V). This voltage, however, was static under various engine loads and should actually vary with load. This was only found out by a very keen techinician at Porticraft..who a full set of diagnostics and not only a fault download.

Its worth a check.

PS they changed the senor in about 15mins....ho hum all is well in the 993 world!!!
 
Mike,
Echoing day1zero - Also can confirm a problem I had was similar and a replacing the O2 sensor cured it. OPC monkeys were useless at diagnosis so dont solely rely on the OBD codes. (OBD threw codes which they attempted to fix but were nothing to do with the problem).

Check out rennlist posts ...... technical information there is invaluable.

Chris
 
Chris and Day1zero,
many thanks for the input. I shall certainlu look into this.
Cheers.
Mike
 
On my 993 C4 I had a problem where the car would sometimes fail to start - turned over OK but would not fire. Only ever happened when starting - the car never cut out whilst running. The problem was becoming pretty regular and I replaced the DME (as this was a simple and low cost point to start) - since then (about a year ago) I've never had the problem. I also now carry a spare DME!

So, it might be the DME might not be! But the cost is low and it's simple to change so it might just be worth replacing it even if it just eliminates that as the cause.

If you have access to a diagnostic tester (eg Durametric) then it would be worth checking for any fault codes. If you haven't got access then call your local 'indy'.

Hope the above is of some help.

Regards
Anton
 

ORIGINAL: gresley

Can the failure of this be intermittent ? I.e. can engine cut out and then restart 40 secs. later when turned over on starter.

You can guess why I am asking!

Andrew W. 
Click to expand...


Yes indeed it can. If I was a betting man I would put a substantial amount of money on the DME relay as being your problem if that's your symptoms. The earlier 994 numbered item is the one that's prone to failure, I don't think the revised 993 numbered ones have been known to fail, so don't see the point in carrying a spare


 
I think you mean 944 numbered item, clyde.[8|] Have just replaced mine with a 993 numbered one which I've had (and it's travelled around with me) since owning the car (as a spare).[;)]
The original one was surprisingly a 944 numbered one... could've sworn I'd checked that ages ago.
 
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