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Power loss and shutdown

 
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RVA924s  



Joined: 18 Mar 2019
Posts: 4
Location: Richmond VA

PostPosted: Mon Mar 18, 2019 7:38 am    Post subject: Power loss and shutdown Reply with quote

Been randomly experience something new with my 87 924s. With normal driving I have experienced a sudden power loss followed by the engine shutting down. It forces me to the side of the road to restart engine and the proceed as normal.
Anybody have any ides why this is happening?
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 1620
Location: MI

PostPosted: Mon Mar 18, 2019 7:54 am    Post subject: Reply with quote

Probably the DME relay.. Just a guess but a good place to start..
http://www.clarks-garage.com/shop-manual/fuel-05.htm
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kevingross  



Joined: 15 Apr 2015
Posts: 29
Location: Stow, MA, USA

PostPosted: Mon Mar 18, 2019 8:30 am    Post subject: Reply with quote

Fasteddie313 wrote:
Probably the DME relay.. Just a guess but a good place to start..
http://www.clarks-garage.com/shop-manual/fuel-05.htm


Yup, that's where I'd start in my diagnosis. Good luck!
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Catellus Engineering, Inc.
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mikseymono1  



Joined: 08 Feb 2019
Posts: 5
Location: Brittany, France

PostPosted: Tue Mar 19, 2019 5:46 pm    Post subject: Reply with quote

This has happened to me last year....quite frightening really. I changed the DME relay and all has been good. Go for an OEM one though....I bought an old URO one which was 'crapado' straight out of the box.....for info, if you do have a URO one..this may be useful https://porsche924.co.uk/forum/viewtopic.php?f=46&t=32555

Just also make sure the relay bracket that holds all the fuses is secure....we have a fair bit of vibrations in our cars and it all helps to keep connections snug and tight.

Good luck!

M
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11377
Location: PacNW

PostPosted: Thu Mar 21, 2019 2:14 am    Post subject: Reply with quote

This:

http://www.ftech9.com/new-products/993-ssr


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RVA924s  



Joined: 18 Mar 2019
Posts: 4
Location: Richmond VA

PostPosted: Fri Mar 29, 2019 6:17 am    Post subject: Reply with quote

Tried the new relay without success. My issue seems only to manifest itself with hard acceleration. Could it be something else?
When pressed with purpose the car shuts off and battery light comes on. Trying to restart while rolliing in neutral with clutch in doesn't work however at a dead stop I have no issues restarting
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mikseymono1  



Joined: 08 Feb 2019
Posts: 5
Location: Brittany, France

PostPosted: Fri Mar 29, 2019 6:24 am    Post subject: Reply with quote

Ok...feel your pain..so what exact, make, relay did you plug in?
Is the fuse relay board all seated correctly? I had mine where it was not fixed into the left hand side..and with all the vibrations took out a wire which shut it down.....
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RVA924s  



Joined: 18 Mar 2019
Posts: 4
Location: Richmond VA

PostPosted: Fri Mar 29, 2019 6:41 am    Post subject: Reply with quote

I ordered this one prior to getting Rasta's recommendation
https://www.autohausaz.com/pn/12636953-99361522700?utm_source=google&utm_medium=cpc&utm_campaign=feed_Porsche&gclid=Cj0KCQjw4fHkBRDcARIsACV58_HytqjTXfRq1FMI3tA9zGfGVRkry

It's in... But the fit isn't super tight.. But when checking it appears most if the relays have a little play when wiggled.
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mikseymono1  



Joined: 08 Feb 2019
Posts: 5
Location: Brittany, France

PostPosted: Fri Mar 29, 2019 6:51 am    Post subject: Reply with quote

Seems fine...for me...I would double check all the pins from the back side of the relay...to make sure that all the pins connect correctly and wires connect solidly..I can not stress enough that ours cars do vibrate a lot more than your normal modern car and IF the wires are not on tight..they WILL wiggle free and shut you down! Just get behind that fuse relay board and have a good look....I thought I did..several times, but found a loose wire.............cost me 3x new DME relays.....quite often the challenges we have are hidden in plain sight!
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RVA924s  



Joined: 18 Mar 2019
Posts: 4
Location: Richmond VA

PostPosted: Sat Mar 30, 2019 3:28 am    Post subject: Reply with quote

Alright Mike... you're my ace now.. dont fail me

How do I remove the panel to get behind it..
I began to attempt this.. but I have a habit of making things worse.
There appears to be one screw holding it in the mounting bracket.. then it looks like a push up and fold out process clearing a tab and slotted grove on right side of panel..
Is that it?? or am i missing something.

Now on the the making it worse..
I began this process but decided to stop and make sure i am correct.. I must have jiggled the DME wiring even more loose because now the car will only run for like 15 seconds before cutting off.

Side note..prior to my investigation
In neutral i was able to throttle the engine up and kill it using the throttle cable on the engine.

could I also have an issue with the fuel pump itself?
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mikseymono1  



Joined: 08 Feb 2019
Posts: 5
Location: Brittany, France

PostPosted: Sat Mar 30, 2019 5:25 am    Post subject: Reply with quote

OK...so not rocket science........to get behind it...just unscrew the row of relays and pull it up and out of its fittings....you need to make sure all wires behind the relays are seated properly in the relays themselves....I had one loose wire in the DME relay that with all the vibrations shook it loose and it shut down....make sure the bracket that holds all the relays in place is not loose......for my RHD car there is a male part on the left hand side that goes into a female hole then on the right a male part just hooks over......bon chance.

M
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scm924s  



Joined: 22 Oct 2010
Posts: 220
Location: Gloucester UK

PostPosted: Sun Mar 31, 2019 8:58 pm    Post subject: Reply with quote

I would check the fuel pump fuse and make sure it and the contacts in the fuse panel are good and clean. The fuse is No.2 on the aux fuse panel on the LHS of the passenger footwell (in RHD cars), think it's in the same location on LHD cars. Fuses are numbered from the firewall end should be 16A.
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