Misfire, Cylinder 4
 

Had a CEL with a code of Misfire on Cylinder 4. Replaced the Spark Plug, Tube and Connector. Still misfiring at higher gears when I "punch it".

What else could it be? The Coil itself? The Wires?

What would you do?

John, My feeling is wire. I had this problem 2 months ago with another engine, WIRE was the problem when pushing the "pedal" down. Good luck. Max in Beaufort

Check the coil pack for cracks.

Max...thanks. Any idea of the part number or official name of the wire is?

Max ... is this the "wire"?

$139.00????!!!!

http://986forum.com/forums/attachment.php?attachmentid=15650&stc=1&d=13213193 47

Now Im not sure......buy the coil or buy the wire???:barf:

John - the "wires" seldom fault unless eaten out by rodents - they are 12 volt Low Tension.
The normal cause for ignition faults lie with the coilpack itself - usually starting with cracks in the insulation and made worse once moisture gets into the cracks, causing a misfire.
Replace the suspect coilpack and inspect the other 5 - once one has failed, the others seem to follow soon after.
Plus 6 x new coil packs seem to give a decent boost in performance too.....

John, Not sure about the wire. It was same problem but on a different engine(not Porsche) The coil makes sense ... also. I have a slight miss ( I think) at idle at the stop sign. Yesterday was the first trip out on the road since fuel pump replacement and noticed a little shake. Let us know , John !!! Max

Just swap a coil pack from another cylinder to #4, if 4 doesn't misfire, then its the coil pack. If it still misfires, then look to the wiring.

Ordered Coil Pack today....will be here tomorrow. I will update then.

Got the coil pack.....replaced the old one in cyl. 4. Drove it "Like the Doctor Ordered" and no misfire!!

Feels good to accomplish little things!!!:dance:

Picture of old coil...missing 3 pcs./cracked:

http://986forum.com/forums/attachment.php?attachmentid=15656&stc=1&d=13214713 26

John, Good news to know ! I was in Wilmington today and did not see a flash go by. By the way the past owner was from Hampstead and bought tires from McGill on Market st???? rear @ $102.87 front@ $111.76 ???? Do you have any info? Thanks, Max

Yep, I guessed right.

Hi Max....lol at the "flash" passing by. I am not familiar with McGills...I usually go to Black's. What kind of tires (make/size) do you have on the car now?

Hi John, Lot's of flash in your town !!! Tires--- Kumho ecsta asx 255 40 17 rear and 205 50 17 front These were bought by the past owner. They look a little worn but I do not know what they look like new. I need an inspection the first of Dec and do not need to fail. Are these prices in line? 255 $111.76 205 $102.87 At McGill's on Market st. Thanks again John as we are 2 hours away. Max in Beaufort

Max, my tires are as follows:

front. TOYO Proxes T1R ...$137 ea. 205's
rear. Nexxen N3000....$108 ea. 255's

So, yes your prices are in line. Looks like a difference of $60 in your favor on tires. I may need to check out McGills. I just dont know anything about Kumho's. Are they Directional tread tires? My Toyos and Nexxens are.

Thanks John, I will check out Black's as well. Thanks for the info. Let me know when the Eastern NC club gets started as I will join ! Take Care Max