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Hotpot
Silverstone


Joined: 13 Mar 2016
Posts: 111
Location: Manchester


PostPosted: Thu Dec 27, 2018 9:14 am    Post subject: Engine Idle Rough and Cutting Out Reply with quote

Stopping at a junction the other day, my 997.1 C4S almost cut out just before I took off again. I assumed that I had almost stalled it until the next junction and it DID cut out. It started again but the engine sounded rough like it was misfiring or the timing was out. It was struggling to maintain the idle.

Just tried it again this morning, started fine and even sounded better starting from cold. But after leaving it running for a while, it began to splutter and struggle to maintain the idle. There doesn't sound like any other untoward sounds from the engine.


I'm in no way a knowledgable car person but it sounds like fuel mixture or air flow. Perhaps one of the sensors? I'm on the maintenance plan with Hartech who are a few miles away from me but they don't reopen until 3rd January.

Problem is that it is my daily driver. And I'm back to work on 4th January working 12 hour nights. I'm hoping they can let me drop the car off on 3rd January (but I'm worried about it giving up the ghost on the way) and I can then hire a car to get me to work and back.


Can anyone here hazard a guess to what the problem is? Thanks in advance.
 
  
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7032
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Thu Dec 27, 2018 9:16 am    Post subject: Reply with quote

I would plug in a fault reader and check for any codes as a first point.

MC
 
  
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Hotpot
Silverstone


Joined: 13 Mar 2016
Posts: 111
Location: Manchester


PostPosted: Thu Dec 27, 2018 9:22 am    Post subject: Reply with quote

I don't have a fault reader or anything like that. I never do any DIY on the car and servicing and repairs are done by Hartech. Just wondering if anyone has any ideas that won't succeed in depressing me more than I am already. Smile
 
  
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7032
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Thu Dec 27, 2018 9:27 am    Post subject: Reply with quote

Could be a sensor such as coolant which would give the wrong mixture, particularly if only happening when warm.
I think a code reader is worth having anyway, you can get a bluetooth one for a fiver or less and it can give you a clue as to what is happening. I have a plug in one which cost me about £15.

MC
 
  
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Phil 997
Le Mans
Le Mans


Joined: 05 Dec 2015
Posts: 15254
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Thu Dec 27, 2018 9:31 am    Post subject: Reply with quote

It could be an O2 sensor or a coil pack starting to fail . Its not easy to diagnose without seeing it as there are a number of relatively small things that could cause this . Having experienced a failing coil pack it does sound very similar to your description it feels more like something serious when they start to fail the car sounds runs really rough, so I would be putting my money on it being that. Thumb
Do you have AA or similar that you could call out
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Hotpot
Silverstone


Joined: 13 Mar 2016
Posts: 111
Location: Manchester


PostPosted: Thu Dec 27, 2018 9:41 am    Post subject: Reply with quote

Phil 997 wrote:
It could be an O2 sensor or a coil pack starting to fail . Its not easy to diagnose without seeing it as there are a number of relatively small things that could cause this . Having experienced a failing coil pack it does sound very similar to your description it feels more like something serious when they start to fail the car sounds runs really rough, so I would be putting my money on it being that. Thumb
Do you have AA or similar that you could call out



I do have a breakdown service through my insurance with Adrian Flux. Wouldn't really trust a breakdown service with anything other than recovery or a flat battery though.
 
  
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Phil 997
Le Mans
Le Mans


Joined: 05 Dec 2015
Posts: 15254
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Thu Dec 27, 2018 9:55 am    Post subject: Reply with quote

I agree with your thoughts , but as no one is open and a coil pack is a very easy fix it would be worth a try and see it the guys durametric code reader can identify what it is . and at minimum you can then arrange for it to be transported to Hartech on the 3rd. Thumb would I let a breakdown guy get into anything big on my car mmmm no , but they are only cars and these guys are capable of minor fixes. Thumb
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Hotpot
Silverstone


Joined: 13 Mar 2016
Posts: 111
Location: Manchester


PostPosted: Thu Dec 27, 2018 10:00 am    Post subject: Reply with quote

Phil 997 wrote:
I agree with your thoughts , but as no one is open and a coil pack is a very easy fix it would be worth a try and see it the guys durametric code reader can identify what it is . and at minimum you can then arrange for it to be transported to Hartech on the 3rd. Thumb would I let a breakdown guy get into anything big on my car mmmm no , but they are only cars and these guys are capable of minor fixes. Thumb



You might have a point there Phil. Give the breakdown a ring and see what he says. Cheers.
 
  
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Porschekit
Österreich


Joined: 12 Aug 2014
Posts: 901
Location: North East UK


PostPosted: Thu Dec 27, 2018 10:18 am    Post subject: Reply with quote

Sounds more like coil pack(s) to me. I run a 997.1 C4S and had the same thing happen while driving on two occasions. First time it was one pack and next time it was two at the same time. The engine coughs and splutters and sounds very rough and lumpy, but still drives. a change of coil packs did the trick...... Thumb
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ragpicker
Reims


Joined: 14 Apr 2013
Posts: 4004
Location: North East England


PostPosted: Thu Dec 27, 2018 10:22 am    Post subject: Reply with quote

Vacuum line perished/broken leading to air leak after the MAF.

Thats my 2p, but you need the codes to rule out the coil packs.
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Hotpot
Silverstone


Joined: 13 Mar 2016
Posts: 111
Location: Manchester


PostPosted: Thu Dec 27, 2018 10:30 am    Post subject: Reply with quote

Thanks for all the replies guys. Flux Recovery are on their way. I'll keep you posted as to what they say.
 
  
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Hotpot
Silverstone


Joined: 13 Mar 2016
Posts: 111
Location: Manchester


PostPosted: Thu Dec 27, 2018 11:33 am    Post subject: Reply with quote

Ok. Recovery guy couldn't help and basically said I'll have to take it to Porsche. But I have Hartech which is better than Porsche. He told me if I make sure Hartech can take my car on the 3rd January and then ring them up on the day, they can arrange for a truck to tow it to Hartech for me. From there, I'll just hire a car for a few days as I'm sure Hartech will sort it pretty quick.
 
  
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Phil 997
Le Mans
Le Mans


Joined: 05 Dec 2015
Posts: 15254
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Thu Dec 27, 2018 11:49 am    Post subject: Reply with quote

Ok , well at least you now know they will take it to Hartech , I went past my OPC just now and they were open , not sure if the whole place is open eg service etc but it might be worth a call if yours isn't far away and see if they can look at it tomorrow get the relay to take it there in the morning. Thumb
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Hotpot
Silverstone


Joined: 13 Mar 2016
Posts: 111
Location: Manchester


PostPosted: Thu Dec 27, 2018 12:27 pm    Post subject: Reply with quote

Cheers Phil. He DID say it was probably a sensor and not anything serious. I'll wait for Hartech to open as I'm on their maintenance plan and the last thing I want is a huge bill from an OPC.
 
  
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Phil 997
Le Mans
Le Mans


Joined: 05 Dec 2015
Posts: 15254
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Thu Dec 27, 2018 8:02 pm    Post subject: Reply with quote

Hotpot wrote:
Cheers Phil. He DID say it was probably a sensor and not anything serious. I'll wait for Hartech to open as I'm on their maintenance plan and the last thing I want is a huge bill from an OPC.


Thumb Thumb when your there next week ,have a look and see how they are getting on with mine Grin Grin Thumb
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8214
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Thu Dec 27, 2018 8:14 pm    Post subject: Reply with quote

Its easy to check a coil pack, I just had one that was on its way out a couple of weeks ago, I changed all the spark plugs first as I had a new set already, then went about unpluging the power connector on each coil in turn until the rough running doesn't change, ie you lose two cylinders running each time you unplug a health coil pack but when you get to the faulty one it doesn't change.

Mine did run rougher with two cylinders not firing but it did not stall, so you may be looking at a different issue anyway?
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NLW73
Barcelona


Joined: 27 May 2014
Posts: 1453
Location: Yateley


PostPosted: Thu Dec 27, 2018 9:22 pm    Post subject: Reply with quote

if its a coil pack there is an easy way to test it.

get under the rear of the car whilst someone else starts it up.

feel the exhaust manifolds on each side and the exhaust manifold pipe that is cold is your culprit.

you have to be quick before it really gets hold and you burn your hands.

it does work and saves you changing all of them and loads of fiddling around

does the car struggle to rev too?
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Hotpot
Silverstone


Joined: 13 Mar 2016
Posts: 111
Location: Manchester


PostPosted: Sat Jan 05, 2019 5:42 pm    Post subject: Reply with quote

Painless experience as myself and my car was dropped off at Hartech by my recovery service. Pretty sure I spied Phil's motor in the customer car storage area. Stunning bit of kit. Hired a Vauxhall So and So from the local Enterprise Hire and I hope to pick my baby back up on Tuesday 8th. After I get through these damned weekend 12 hour nightshifts.
 
  
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Hotpot
Silverstone


Joined: 13 Mar 2016
Posts: 111
Location: Manchester


PostPosted: Mon Jan 07, 2019 11:55 am    Post subject: Reply with quote

Spoke to Hartech this morning. Apparently just a vacuum pipe came off in engine compartment. Must admit I looked for that after comments on the forum but you can't see much with these engines. So I pick it up tomorrow. Yippee!
 
  
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