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Steveybull
Newbie


Joined: 03 Jul 2016
Posts: 4



PostPosted: Thu Jul 14, 2016 9:23 pm    Post subject: Rough running and back firing after service Reply with quote

I just got my 83 911 sc serviced (oil, oil filter, air filter, fuel filter and spark plugs) after this service the car os running rough and is back firing after acceleration, will it take a couple days to smooth out or is this a sign of bad plugs??
 
  
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kas750
Paul Ricard


Joined: 31 Mar 2013
Posts: 3381
Location: Chorley lancashire

2006 Porsche 911

PostPosted: Thu Jul 14, 2016 9:35 pm    Post subject: Reply with quote

Don't drive it if it is back firing as this can shatter the plastic airbox
 
  
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Steveybull
Newbie


Joined: 03 Jul 2016
Posts: 4



PostPosted: Thu Jul 14, 2016 9:39 pm    Post subject: Reply with quote

So put the old plugs back in??
 
  
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Palladium
Watkins Glen


Joined: 01 Nov 2015
Posts: 2102



PostPosted: Thu Jul 14, 2016 9:50 pm    Post subject: Reply with quote

get a pop off valve in the airbox, take it back to garage,
 
  
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Steveybull
Newbie


Joined: 03 Jul 2016
Posts: 4



PostPosted: Thu Jul 14, 2016 9:56 pm    Post subject: Reply with quote

Thanks l take a look, why would it needing a pop off value now and not before??
 
  
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Palladium
Watkins Glen


Joined: 01 Nov 2015
Posts: 2102



PostPosted: Fri Jul 15, 2016 7:06 am    Post subject: Reply with quote

Steveybull wrote:
Thanks l take a look, why would it needing a pop off value now and not before??




its just an upgrade that people put on their airbox, in case of backfires, there have been many cases of broken airboxes and the cheap solution is to order and fit the valve. you might even have one already.
 
  
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Steveybull
Newbie


Joined: 03 Jul 2016
Posts: 4



PostPosted: Fri Jul 15, 2016 1:35 pm    Post subject: Reply with quote

Palladium wrote:
Steveybull wrote:
Thanks l take a look, why would it needing a pop off value now and not before??




its just an upgrade that people put on their airbox, in case of backfires, there have been many cases of broken airboxes and the cheap solution is to order and fit the valve. you might even have one already.


I havent il order one, but what would of caused this? The car was running 100% and no back firing before the service now it isnt, thats what im trying to find out. One of the old spark plugs was slightly loose would that of released the pressure before hand??
 
  
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Rialas
Barcelona


Joined: 20 Mar 2011
Posts: 1494



PostPosted: Fri Jul 15, 2016 1:45 pm    Post subject: Reply with quote

Steveybull wrote:
Palladium wrote:
Steveybull wrote:
Thanks l take a look, why would it needing a pop off value now and not before??




its just an upgrade that people put on their airbox, in case of backfires, there have been many cases of broken airboxes and the cheap solution is to order and fit the valve. you might even have one already.


I havent il order one, but what would of caused this? The car was running 100% and no back firing before the service now it isnt, thats what im trying to find out. One of the old spark plugs was slightly loose would that of released the pressure before hand??

You mean spark plug lead? If so push it back on as it'll misfire.
It's got to run better after a service, so you need to take it back. Maybe they've mistakenly swapped a couple of the leads. It could be anything to be honest.
 
  
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Palladium
Watkins Glen


Joined: 01 Nov 2015
Posts: 2102



PostPosted: Fri Jul 15, 2016 6:10 pm    Post subject: Reply with quote

take all the plugs out and check the gap, make sure ht leads in correct sequence. speak to garage, sounds very minor, don't worry.
 
  
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3448
Location: Sussex


PostPosted: Fri Jul 15, 2016 7:50 pm    Post subject: Reply with quote

Just take it back to the garage .. they will be mortified that its gone wrong and try to fix it .. its probably a plug fault , one of them has a narrow gap that was not spotted on install .
 
  
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