Porsche Enthusiasts Club Forum

Hi All,

Last year I rescued a 944 2.7 from 5 years layup under a cover outside.
After 6 months renovation - the car was back on the road. With such a long layup - electrical problems were expected (and duly appeared). One persistent problem I have had trouble tracking down is the wash/wipe - and which has now caused me other problems. Here is the story:

Originally the water pump for the washers was faulty and this was changed - all OK
After a few months several wiper functions failed at the same time:

1) Wash and wipe, intermittent wipe and the first (slowest) wiper speed

I checked the wiring diagrams - but do find them hard to read. I did a couple of checks today and the following is noted:

a) No power to the water pump for the washers when I pull the switch
b) When checking power feed to the 'T' of the wiper relay - the 30amp fuse for the wipers blew (I had a multimeter between the T connection and earth)- again when the switch is pulled
c) When checking power feed to the wiper motor (connection no. 2) on the first wiper setting - the same fuse blew- when the switch is pulled

I removed the fuse board looking for any poor connections - found none.

Now - upon trying to restart the car - she initially fired - but I heard a loud click and then she wouldn;t start at all and the lovely "!" symbol lit on the dash.

Bypassing the DME relay (I have a spare direct feed to the fuel pump) - the car fired as usual - and I can energize the fuel pump relay by jumping the relevant connections as per Clark's garage.

So - here are my questions (and thanks for reading so far):

Q1) How likely is it I can have a failed DME relay just at this instance?
Q2) With the fuses blowing - I am getting power to the wiper relay and the wiper motor - but why are the fuses blowing when I try to insert my multimeter?
Q3) Any guidance on why I have lost the three wiper functions I noted at the start?
Q4) Are there any common points to account for the failed wash wipe/wiper/intermittent wiper function?

Thanks for reading!!!

Ian

(Car is 944 2.7 with Pro tuning chip)

Have you got the earthing strap secured on the wiper mechanism / motor

Thanks for the reply - I believe so - but will check and clean just in case

Hello

Update for engine running porblem

1) Replaced DME relay with a new one and still no start (fuel pump not running).
I checked the DMEs I have - and all of them (I now have 3!) pass Clarks tests

So - car runs on jumpers between 87,87b and 30

Will not run with DME relays in situ.

So with power to post 30 and looking at the circuit diagram - I need to check :

a) If I have 12v to post 86 with ignition on
b) If I have earth at post 85
c) If I have ground at post 85b

Any other ideas anyone

2) Replaced the Wiper relay - and now when I turn the lever - the relay does click - but nothing else happens (before there was no click) - I'm still leaning towards a mechanical problem on the wiper motor?

Any other ideas?

thanks

ian

The wiper motors will fill with water and rust inside the housing where the armature is, I have opened some and pulled out a ball of rust!! Sounds like the motor is bad if the relay is clicking. As for the DME relay, make sure they are all the updated ones with the 993 615 227 00.
Good luck!

Thanks for the tip - I'll look again at the motor and armature.
As for the starting problem the fault was that post 85b was not being earthed through the DME.
If I fix an earth to this relay leg and reinsert the relay - the car starts fine - albeit that the fuel pump starts to run on the second position of the key. So - it looks like I have an earthing/DME fault - albeit a minor one.

I don;t think this will be a problem in the short term...?

Ian