11-14-2011, 12:48 PM
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#1
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Registered User
Join Date: Oct 2011
Location: Wilmington, NC
Posts: 229
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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?
__________________
1999 Boxster
Ocean Blue Metallic/Savannah Beige | Tiptronic | Custom Rear Spoiler | 17" Turbo twist | Red Brembo Calipers | GAHH Top w/Glass Window | Tinted Windows | Cruise Control | Leather Interior | Heated Seats | Color Wheel Caps | Traction Control | Debadged
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11-14-2011, 02:19 PM
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#2
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Registered User
Join Date: Sep 2011
Location: eastern NC Crystal Coast
Posts: 413
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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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11-14-2011, 02:57 PM
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#3
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Registered User
Join Date: Dec 2007
Location: Seattle
Posts: 735
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Check the coil pack for cracks.
__________________
2000S Ocean Blue Metallic- 116K
3X Water Pump, Clear side markers, Crios Mod, Front engine mount, Flywheel, clutch, RMS, AOS, MAF, serpentine belt, power brake vacuum line, battery, 2X CV boots, Fuel filter, Oil filler tube, 3X ignition switch, 90K service, gas cap, Coolant tank
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11-14-2011, 04:00 PM
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#4
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Registered User
Join Date: Oct 2011
Location: Wilmington, NC
Posts: 229
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Max...thanks. Any idea of the part number or official name of the wire is?
__________________
1999 Boxster
Ocean Blue Metallic/Savannah Beige | Tiptronic | Custom Rear Spoiler | 17" Turbo twist | Red Brembo Calipers | GAHH Top w/Glass Window | Tinted Windows | Cruise Control | Leather Interior | Heated Seats | Color Wheel Caps | Traction Control | Debadged
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11-14-2011, 04:09 PM
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#5
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Registered User
Join Date: Oct 2011
Location: Wilmington, NC
Posts: 229
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__________________
1999 Boxster
Ocean Blue Metallic/Savannah Beige | Tiptronic | Custom Rear Spoiler | 17" Turbo twist | Red Brembo Calipers | GAHH Top w/Glass Window | Tinted Windows | Cruise Control | Leather Interior | Heated Seats | Color Wheel Caps | Traction Control | Debadged
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11-14-2011, 11:46 PM
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#6
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Registered User
Join Date: Dec 2008
Location: Queensland, Australia
Posts: 1,522
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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.....
__________________
2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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11-15-2011, 04:52 AM
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#7
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Registered User
Join Date: Sep 2011
Location: eastern NC Crystal Coast
Posts: 413
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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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11-15-2011, 07:59 AM
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#8
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Registered User
Join Date: May 2011
Location: Miami florida
Posts: 1,591
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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.
__________________
Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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11-15-2011, 10:36 AM
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#9
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Registered User
Join Date: Oct 2011
Location: Wilmington, NC
Posts: 229
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Ordered Coil Pack today....will be here tomorrow. I will update then.
__________________
1999 Boxster
Ocean Blue Metallic/Savannah Beige | Tiptronic | Custom Rear Spoiler | 17" Turbo twist | Red Brembo Calipers | GAHH Top w/Glass Window | Tinted Windows | Cruise Control | Leather Interior | Heated Seats | Color Wheel Caps | Traction Control | Debadged
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11-16-2011, 10:22 AM
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#10
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Registered User
Join Date: Oct 2011
Location: Wilmington, NC
Posts: 229
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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!!!:dance:
Picture of old coil...missing 3 pcs./cracked:
http://986forum.com/forums/attachments/boxster-general-discussions/15656d1321471326-misfire-cylinder-4-img_20111116_141217.jpg
__________________
1999 Boxster
Ocean Blue Metallic/Savannah Beige | Tiptronic | Custom Rear Spoiler | 17" Turbo twist | Red Brembo Calipers | GAHH Top w/Glass Window | Tinted Windows | Cruise Control | Leather Interior | Heated Seats | Color Wheel Caps | Traction Control | Debadged
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11-16-2011, 02:21 PM
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#11
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Registered User
Join Date: Sep 2011
Location: eastern NC Crystal Coast
Posts: 413
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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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11-16-2011, 04:10 PM
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#12
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Registered User
Join Date: Dec 2007
Location: Seattle
Posts: 735
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Quote:
Originally Posted by Spinnaker
Check the coil pack for cracks.
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Yep, I guessed right.
__________________
2000S Ocean Blue Metallic- 116K
3X Water Pump, Clear side markers, Crios Mod, Front engine mount, Flywheel, clutch, RMS, AOS, MAF, serpentine belt, power brake vacuum line, battery, 2X CV boots, Fuel filter, Oil filler tube, 3X ignition switch, 90K service, gas cap, Coolant tank
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11-17-2011, 12:15 PM
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#13
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Registered User
Join Date: Oct 2011
Location: Wilmington, NC
Posts: 229
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Quote:
Originally Posted by milliemax
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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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?
__________________
1999 Boxster
Ocean Blue Metallic/Savannah Beige | Tiptronic | Custom Rear Spoiler | 17" Turbo twist | Red Brembo Calipers | GAHH Top w/Glass Window | Tinted Windows | Cruise Control | Leather Interior | Heated Seats | Color Wheel Caps | Traction Control | Debadged
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11-19-2011, 05:15 AM
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#14
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Registered User
Join Date: Sep 2011
Location: eastern NC Crystal Coast
Posts: 413
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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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11-19-2011, 11:32 AM
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#15
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Registered User
Join Date: Oct 2011
Location: Wilmington, NC
Posts: 229
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Quote:
Originally Posted by milliemax
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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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.
__________________
1999 Boxster
Ocean Blue Metallic/Savannah Beige | Tiptronic | Custom Rear Spoiler | 17" Turbo twist | Red Brembo Calipers | GAHH Top w/Glass Window | Tinted Windows | Cruise Control | Leather Interior | Heated Seats | Color Wheel Caps | Traction Control | Debadged
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11-20-2011, 06:18 AM
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#16
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Registered User
Join Date: Sep 2011
Location: eastern NC Crystal Coast
Posts: 413
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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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1999 Porsche Boxster
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