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Old 11-14-2011, 01:48 PM   #1
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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?

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Old 11-14-2011, 03:19 PM   #2
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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
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Old 11-14-2011, 03:57 PM   #3
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Check the coil pack for cracks.
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Old 11-14-2011, 05:00 PM   #4
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Max...thanks. Any idea of the part number or official name of the wire is?
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Old 11-14-2011, 05:09 PM   #5
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Max ... is this the "wire"?

$139.00????!!!!

http://986forum.com/forums/attachments/boxster-general-discussions/15650d1321319347-misfire-cylinder-4-wire.jpg

Now Im not sure......buy the coil or buy the wire???
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Old 11-15-2011, 12:46 AM   #6
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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.....
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Old 11-15-2011, 05:52 AM   #7
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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
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Old 11-15-2011, 08:59 AM   #8
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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.
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Old 11-15-2011, 11:36 AM   #9
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Ordered Coil Pack today....will be here tomorrow. I will update then.
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Old 11-16-2011, 11:22 AM   #10
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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!!!

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

http://986forum.com/forums/attachments/boxster-general-discussions/15656d1321471326-misfire-cylinder-4-img_20111116_141217.jpg
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Old 11-16-2011, 03:21 PM   #11
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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
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Old 11-16-2011, 05:10 PM   #12
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Quote:
Originally Posted by Spinnaker View Post
Check the coil pack for cracks.
Yep, I guessed right.
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Old 11-17-2011, 01:15 PM   #13
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Quote:
Originally Posted by milliemax View Post
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

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?
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Old 11-19-2011, 06:15 AM   #14
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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
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Old 11-19-2011, 12:32 PM   #15
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Quote:
Originally Posted by milliemax View Post
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.
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Old 11-20-2011, 07:18 AM   #16
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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

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