07-15-2014, 12:24 AM
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#1
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Registered User
Join Date: Feb 2007
Location: Australia
Posts: 220
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Misfire at 3K
Just developed a missfiire at around 3K.
I'm thinking it could be plugs, injectors or coils.
How can I eliminate or any other suggestions?
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07-16-2014, 04:02 AM
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#2
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Registered User
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,512
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Quote:
Originally Posted by aussieboxy
Just developed a missfiire at around 3K.
I'm thinking it could be plugs, injectors or coils.
How can I eliminate or any other suggestions?
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Hi,
if you have access to a OBD tester, Durametric, or Porsche OBD test tool you can read out error code and check what's wrong with your engine. Coils and injectors are monitored.
If it's a coil problem, you can change the coil with one that produces no faults an see if the fault moves along with the faulty coil.
You can also check if have any leaks in the intake area. Just check with start pilot, or brake cleaner.
Regards
Markus
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07-16-2014, 06:04 AM
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#3
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Registered User
Join Date: Apr 2012
Location: Riverside, CA
Posts: 1,665
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How do you know its truly a misfire?
Can you describe what is happening.
Check engine light?
Lack of power?
Stumble?
__________________
"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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07-21-2014, 05:02 PM
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#4
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Registered User
Join Date: Feb 2007
Location: Australia
Posts: 220
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Quote:
Originally Posted by jb92563
How do you know its truly a misfire?
Can you describe what is happening.
Check engine light?
Lack of power?
Stumble?
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No CEL. When accelerating at 3k it stutters, hesitation & flat spot. It's not just that it fails to continue to accelerate evenly, it actually has multiple small jolts. Pretty hard to explain, the best way to describe it is a misfire until about 3.3k then everything is as normal.
It occurs until mild, moderate & full accelleration.
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07-23-2014, 12:44 AM
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#5
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Registered User
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,512
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Hi,
do you have the missfire only when driving, or do you have the missfire also when the car stand still and you rev the engine up?
Regards
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07-25-2014, 03:43 PM
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#6
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Registered User
Join Date: Feb 2007
Location: Australia
Posts: 220
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Quote:
Originally Posted by Smallblock454
Hi,
do you have the missfire only when driving, or do you have the missfire also when the car stand still and you rev the engine up?
Regards
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It's not noticeable when just revving while car is stationary
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07-25-2014, 07:12 PM
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#7
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Registered User
Join Date: Aug 2004
Location: Alta Loma, CA
Posts: 1,334
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Unplug the mass air flow sensor... drive it around.. and report back to us 
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07-30-2014, 06:36 AM
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#8
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Registered User
Join Date: Apr 2012
Location: Riverside, CA
Posts: 1,665
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It sounds like what I am experiencing as well, unfortunately its not resolved yet but its intermittent in my case so I beginning to think it may be an electrical or ground problem of some sort.
You have to check a bunch of things to narrow it down, starting with the fault codes, MAF, air leaks and Fuel supply, AOS.
http://986forum.com/forums/performance-technical-chat/52071-how-diagnose-resolve-engine-issues-using-durametric.html
__________________
"It broke because it wants to be Upgraded "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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07-30-2014, 06:45 AM
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#9
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Registered User
Join Date: Sep 2013
Location: Montreal, QC. (currently expat to Shanghai)
Posts: 3,249
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I've been swamped in car charging systems, bad batteries, alternators/regulators, etc for the last week. Most if not all that I've seen online experiencing/reporting low voltages also get those similar error codes (misfire here and there). Rule out the car's charging system while at it. MAF and as others have recommended are also good place to start looking
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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