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986 2.7 tip cylinder 1 misfire only at high revs issue

Hi again. took car from garage tonight and drove it through rush hour so no chance to give proper run.... however, I can already feel the difference. Even the tip seems to be behaving itself. So much more responsive. Feels like my old car again.
It's def a new one on him. So suppose it's always worth trying the elimination process first even though logic says different. So glad as was really contemplating an early trade in. Put a smile back on my face....even at rush hour!!!

Needs a good run just to be sure but feeling confident... fingers x'd.

Cheers once again. Hopefully this post will remain on the site for a while so if anyone has a similar set of issues this might just prevent a few sleepless nights. Cracking still on stereo so appeared to be a red herring ????? It's no biggie as was planning a double din conversion and speaker upgrade. might get a suppressor or two fitted just to get rid of the noise.

🤞🤗 :thumb:
 
Well here we are again.
Drove the car tonight pulled away from lights with a bit of vigour and hesitation then a thud from the gearbox when changing up. It appears that the issue is still present.
I have a theory. Would a blocked catalyst give me these symptoms as I'm struggling to work out what's going on.
Also the only other theory is the gearbox itself. Super smooth most of the time but as soon as a sharp acceleration is applied then it clunks into gear once then doesn't do it again.
I think there's a link with the misfire/ hesitation and the clunk into gear.
Local Porsche specialist next me thinks. :dont know:
 
I did wonder at the Maf sensor fixing the fault as it didnt make sense to me .

Ok too work ..

You need a fault code check to confirm you still have a high rev misfire on No.1 as if you do then this is a fault that needs correcting before moving onto things like gearbox or blocked cats .

Im still with the wiring or dme for that injector atm , the fault code is specific .. the car is seeing an open circuit ( break in the wire ) or a short circuit .. with the fault you have then i will throw in high resistance in the wiring .. not huge but at high rpm a small resistance could well do this .

Or its just an intermitant break in the wire .. you wiggle it with engine running basically .

A blocked cat .. it will affect every cyl on that bank .. you wont get a single injector fault .. you will get a severe lack of power .. you will have adaption faults and if put on an emissions tester then that bank will be way off .

Gear box wont affect the engine as such .. torqure convertor clutch at certain rpm can but not really at high rpm .. and it doesnt sound like a box fault to me .. sounds like as the car is saying you have a misfire .


Suggestions .. it needs a Porsche indy really and you to tell them what has been done and what the fault is in detail ..

Or a 987 ... Porsche do make some excellent cars and most dont have many problems :thumb:
 

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