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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6159
Location: Brighton


PostPosted: Fri Oct 05, 2018 6:07 pm    Post subject: Reply with quote

I think the OPC will find plenty of fault codes to work through and have no trouble finding the fault to be honest .
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emohawk11
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Joined: 01 Aug 2018
Posts: 25



PostPosted: Fri Oct 05, 2018 8:26 pm    Post subject: Reply with quote

Does my car have a DME relay ? Was telling my dad about the car problems and he read another Porsche owner had the exact same issue. That owner was advised it could be DME relay, DME sensor, or crank sensor. Sadly no follow up email to confirm fix.

Will follow up once car has been to PC. Thanks for listening and your help so far.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6159
Location: Brighton


PostPosted: Sat Oct 06, 2018 3:40 pm    Post subject: Reply with quote

Dme relay problems are related to the earlier air cooled cars .. its a common problem hence most owners carry a spare.

There is not a relay like that as such .. rather several different electrical items .. there are various things i can think of that would cause your problem but with out any fault codes then not only would it take me ages to list it all out it wouldn,t help you.

As with any item it needs testing to see if its faulty and on a 991 then most of that is done with a tester connected.

You WILL have fault codes listed and that will lead anyone to what the fault is .

On the off chance they cant fix it ( which i very much doubt ) then give me a list of the codes found and ill add my 2 pennys worth to the problem Very Happy
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emohawk11
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Joined: 01 Aug 2018
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PostPosted: Sat Oct 06, 2018 7:53 pm    Post subject: Reply with quote

Thank you, at least it’s not the DME relay then, although a cheap fix

I’ve managed to consistently replicate the fault with the car sat in the drive way. Leave engine running for 40 minutes or so, get in car, Rev to about 6k, take foot off the gas and the engine then stalls. After restarting the engine, it fires up idles for a second then stalls. This happens over and over, unless adding a bit of gas, Rev around 2k and the engine runs for a few seconds before the engine fault message displays, plus the usual PSM & auto stop start

Hoping the above will allow the PC to replicate while they have their diagnostics plugged in
 
  
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emohawk11
Newbie


Joined: 01 Aug 2018
Posts: 25



PostPosted: Wed Oct 17, 2018 2:13 pm    Post subject: Reply with quote

Update: Porsche managed to read some fault codes today as I dropped
Off the car running rough. The codes show a misfire on bank 2, cylinders 4,5 and 6. The valve lift control was shown as a fault.

Porsche plan to swap over the valve solenoids for banks 1 and 2 and see if the misfire is then for cylinders 1,2 and 3.

I’ve had some good help here and wanted to keep you up to date in case it helps others.
 
  
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emohawk11
Newbie


Joined: 01 Aug 2018
Posts: 25



PostPosted: Wed Oct 17, 2018 2:36 pm    Post subject: Reply with quote

Forgot to ask, if it is the valve solenoid, what’s the likely labour and parts bill. ?
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6159
Location: Brighton


PostPosted: Wed Oct 17, 2018 7:07 pm    Post subject: Reply with quote

Hi lift valve solinoid bank 2 BUT i dont like the misfire on no 2 as normally you get just the bank of misfires .

I have a hunch about this but ill not bore you with it .. im good with what they are doing but to be honest i would just throw the bank 2 solinoid at it .

For any DIYers .. when you remove these solinoids then if ok no oil will come out .. if you DO get oil leaking out then its faulty .. i figured this out after ive done a few .

Ive probably seen 4 of these over the years so not huge but enough for me to think of this as an issue when answering here .

Ok labour time to replace . 1 hour .. parts cost im unsure of but ill guesstimate at £150.

Btw .. the fault is the high lift valve solinoid so the one in the center of the head and NOT the vario cam one.

EDIT ..

Just to explain if you didnt know but bank 1 is cyls 1,2 and 3 with bank 2 being cyls 4,5 and 6 .
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emohawk11
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PostPosted: Wed Oct 17, 2018 7:28 pm    Post subject: Reply with quote

Thanks for the reply. The misfire was just on cylinders 4,5 and 6 (bank 2) only.

Pleased to hear it’s not the vario cam as I understand that part is expensive. Good to hear 1hr labour too.

Will let you know when there is new news
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6159
Location: Brighton


PostPosted: Wed Oct 17, 2018 8:04 pm    Post subject: Reply with quote

Embarassed i didnt read your post properly .. bank 2 not cyl 2 Sad

Either way .. high lift solinoid is the fault or ill send £10 to a charity of your choice if im wrong.
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emohawk11
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Joined: 01 Aug 2018
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PostPosted: Fri Oct 19, 2018 8:04 pm    Post subject: Reply with quote

That’s generous of you to offer money to a charity, though you’d already seen the fault pointed to the valve lift control in an earlier post so you were always going to be right 😁

Update: Porsche said today the cost is £230 to fit and replace the valve solenoid. I’m delighted to get the problem fixed for less than the cost of a tyre. It will be great to have a car that doesn’t break down all the time too !
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6159
Location: Brighton


PostPosted: Fri Oct 19, 2018 8:11 pm    Post subject: Reply with quote

Excellent result ... its fixed Smile

Ill still stick a tenner in a charity box though ... been a few monthes since i have .
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