Heads Up Warning DME Relay

[Porker993]

I know its been said a thousand times before, but it finally happened to me. 6.00 pm last week in the car park at work - after a week of reluctant starting - suddenly the engine refused to fire at all.

Imagine the shame of being tow started by my girlfiriend in our Defender 90. I just hope no one saw it.

The first time in 10 years of 911 ownership that one has let me down.

After all the advice to check the part number and carry a spare I never did, so please carry a spare, especially if yours has the "944" part number like mine did.

The relay is number R53 in the front fuse box so it's dead easy to access.

 

[LK_991GTS]

...and make sure the new relay you get is the later one with part number starting with 993...

 

[Porker993]

ORIGINAL: MoC2S

Mark, that doesn't sound quite right ... [:-]

The DME relay basically just turns on the power to the DME, funnily enough ... so car will crank but not fire. A tow start will not help (unless you just shook the relay into life with the movement) ...

Or did you flatten the battery trying, then replaced the relay, then tow start with just enough juice for the spark .. ?

Or perhaps I've got the wrong end of the stick .. its possible I'm not infallible .. []

Anyway, we should all check for the old 944 part, and probably carry a spare .. []

cheers, Maurice

Ah, I didn't realise.
Maybe the sudden movement galvanised it into action.
Anyhoo, it's been working 100% perfectly first turn of the key since I replaced the relay, so fingers crossed....

 

[andcop]

The problem with the old 944 relays is that the solder dry joints and cracks. This can lead to an absolute failure or can be intermittent.

I had a similar problem where ocassionally it would play up and not start. Replaced with 993 part no problem

 

[Porker993]

ORIGINAL: andcop

The problem with the old 944 relays is that the solder dry joints and cracks. This can lead to an absolute failure or can be intermittent.

I had a similar problem where ocassionally it would play up and not start. Replaced with 993 part no problem

I reckon that's what happened - at least that's what I'm pinning my hopes on. Anyway - it's 11 days now and still working OK.

 

[Johnny C]

I had a quick look this morning and there seems to be 4 relays with R53 written on the top... which is the one that would go? They're all branded Audi.

What is the part number I should get?

 

[Porker993]

Eh ?
The relay number (e.g. R53) is written on the plastic base of the fuse box in the front compartment adjacent to where the relay plugs in. In most cases there is a small arrow pointing to the correct location of the relay, so there can be no mistake.

In this case just ignore what is written on the actual relay itself.

All the above is correct for a 1994 model 993 Carrera. I am not aware it is any different for other models.