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Will Statt
Montreal


Joined: 28 Aug 2003
Posts: 500
Location: Derbyshire


PostPosted: Sat Aug 10, 2019 3:45 pm    Post subject: Car not firing... ideas where to look first please! Reply with quote

Well it did fire up.... I hadn't started it for a about 2 months, but needed to move it out of the shed. I connected the battery and she started first turn of the key no problem. I reversed her out of shed, across the yard, and she just stopped. Turns over no problem, with plenty of speed but no sign of firing up. I swapped over the dme for the unused spare I had, but still the same. Plenty of petrol in her.

Any ideas? Sad
 
  
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Windy101
Spa-Francorchamps


Joined: 05 Jun 2015
Posts: 282



PostPosted: Sat Aug 10, 2019 4:04 pm    Post subject: Reply with quote

Fuel pump dme relay is the easiest and most likely culprit.
 
  
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Leosayer
Montreal


Joined: 11 Nov 2006
Posts: 523
Location: NE London

1996 Porsche 993 Carrera 2

PostPosted: Sat Aug 10, 2019 7:31 pm    Post subject: Reply with quote

Similar symptoms to mine which was solved by replacing the DME relay.

It's a common issue - carrying a spare is a good idea and they're not expensive.
_________________
1996 C2 Coupe, Polar Silver, Manual
 
  
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decgraham
Barcelona


Joined: 17 Sep 2008
Posts: 1363
Location: Spain


PostPosted: Sun Aug 11, 2019 7:05 am    Post subject: Reply with quote

I know that you say you have changed the DME but I too believe that could be the culprit. I would try another one just to be sure. I had a similar problem to you some years back, swapped the relay for my spare and all was fine. Then I decided to put back the old one to see what might happen and hey presto it worked, it just shows that the relays can be temperamental.

Hope you get it sorted.

ATB Smile
_________________
1995 993 C2 Cab TipS in Guards Red
 
  
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Will Statt
Montreal


Joined: 28 Aug 2003
Posts: 500
Location: Derbyshire


PostPosted: Sun Aug 11, 2019 12:06 pm    Post subject: Reply with quote

Windy and Leo..... i've changed the dme if you read my original post. But still no firing. Decgraham... the one i replaced it with was brand new in box, and been carried as a spare since reading of the chance of failure.... is it really likely that the spare would be dud?

What other possibilities are there?

Will Sad
 
  
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decgraham
Barcelona


Joined: 17 Sep 2008
Posts: 1363
Location: Spain


PostPosted: Sun Aug 11, 2019 12:42 pm    Post subject: Reply with quote

Hi Will,

Your symptoms are classic DME relay issue. I don't wish to insult you but you are looking at the right relay? If your relay is brand new then logic says it should be ok ..but who knows, you can't always apply logic to a 993, that's why I suggested to try one more, do you have another 993er close by?

I can´t think of anything else, as the car is turning over but not catching fuel looks to be the culprit. The only other thing that I can think of is a problem with the ignition?

Good luck with solving the problem and please come back and let us know what it was when you do Thumb
_________________
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Windy101
Spa-Francorchamps


Joined: 05 Jun 2015
Posts: 282



PostPosted: Sun Aug 11, 2019 1:07 pm    Post subject: Reply with quote

If you are sure the relay is good then the next place to look is the fuel pump, but its not an easy diy job as it really helps to get the car up on a ramp/lift.

Crank sensor is also a potential culprit on the ignition side.
 
  
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madalaa
Fuji


Joined: 13 Mar 2008
Posts: 9510
Location: West London

2009 Porsche Boxster 987

PostPosted: Mon Aug 12, 2019 7:26 am    Post subject: Reply with quote

Could be the engine crank sensor ...... that was the problem I had with similar circumstances.
 
  
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HPNer
Hockenheim


Joined: 25 Jun 2014
Posts: 739
Location: Jolly Boyos Country


PostPosted: Mon Aug 12, 2019 8:01 am    Post subject: Reply with quote

+1 for the crank sensor, if DME relay(s) are all good.
_________________
Today, I shall mostly be driving my 993 . . .
-------
You've bought the ticket, so take the ride . . .
Faster, faster, faster, until the thrill of speed overcomes the fear of death...
 
  
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Will Statt
Montreal


Joined: 28 Aug 2003
Posts: 500
Location: Derbyshire


PostPosted: Mon Aug 12, 2019 8:18 am    Post subject: Reply with quote

Well here we go..... I tried for about 30 mins on saturday to get her to restart.... tried both the original, and the new/unused dme relays ( I def had the right one decgraham as it clearly says 'dme' on them both, and dont' worry, I'm not offended as I'm quite capable of getting something like that wrong! Smile ) Anyway... battery is really good, and belts the engine over like mad, but no firing so gave up. (and had to push the weighty beast back into the shed Sad

I was thinking this morning though that I don't remember hearing the normal 'buzz' of the fuel pump, so think I'll have another go. So.... reconnect battery, press button of PA1000 and sure enough I do here the fuel pump buzzing... but it doesn't seem to stop like it normally does but I turn the key anyway, and she fires up first turn of the engine! (this is with the original DME) Left her running for 5 mins and no repeat of the stoppage, so now I'm mystified! She's overdue a service and mot, so I better get her booked in, and see if anything can be found as I don't fancy getting stranded anywhere.

Thanks for all the helpful suggestions anyway.... and hopefully the prob won't reoccur!

Will
 
  
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HPNer
Hockenheim


Joined: 25 Jun 2014
Posts: 739
Location: Jolly Boyos Country


PostPosted: Tue Aug 13, 2019 1:22 pm    Post subject: Reply with quote

When I had issues with the crank sensor, it was very heat dependent, if thats any help. Thumb
_________________
Today, I shall mostly be driving my 993 . . .
-------
You've bought the ticket, so take the ride . . .
Faster, faster, faster, until the thrill of speed overcomes the fear of death...
 
  
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Endoman
Barcelona


Joined: 11 Apr 2011
Posts: 1405
Location: Bolton U.K.


PostPosted: Tue Aug 13, 2019 6:06 pm    Post subject: Reply with quote

HPNer wrote:
When I had issues with the crank sensor, it was very heat dependent, if thats any help. Thumb

Had exactly the same. The car died 200yds from Bolton OPC and would not restart. I enrolled the help of 3 members of staff to push me in. After a couple of hours cooling down it fired up again ran for 15mins and then died.
The crank sensor was replaced and I picked the car up the following day. A new holder was required as the sensor had seized in. The position was set with an oscilloscope as it sits slightly differently with a LWF.
_________________
Porsche 944 S2 Coupe Guards Red
Porsche 993 Coupe 9m RS Replica
 
  
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berni29
Watkins Glen


Joined: 24 Oct 2009
Posts: 2205
Location: Kent


PostPosted: Sun Aug 18, 2019 4:34 pm    Post subject: Reply with quote

Hi

Crank sensors can be very tricky when they start to go. As mentioned above, very heat sensitive, and its not always directly obvious because of heat sink.

Best of luck

Berni
_________________
993 C2 Tip 1994 187k miles. Black and Grey. M029 & Bilstein HD's, Elephant Racing RS bushes F&R, RS mounts, strengthened engine carrier, 100 cell cat inserts, HID's. Solid steering arms mod, top of the engine rebuilt, mapped by Wayne, suspension set up by Chris.
 
  
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Windy101
Spa-Francorchamps


Joined: 05 Jun 2015
Posts: 282



PostPosted: Mon Aug 19, 2019 12:25 pm    Post subject: Reply with quote

I would also keep the fuel pump near the top of the list of potential culprits. They can seize and start moving again temporarily.
 
  
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