Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 04-17-2011, 01:47 PM   #1
Registered User
 
Join Date: Apr 2011
Location: Alabama
Posts: 7
All 6 cylinders misfire

First off, I just bought my first Boxster, 2004 Base 65,000 miles, a week ago and love it. Secondly, I appreciate all the information available on this site as well as Mike Focke's page, they have helped me out greatly.

Yesterday my check engine light came on and has stayed on(not blinking). I went by Autozone and they pulled the codes for me. All 6 cylinders had misfired. I can understand 3 misfiring, but all 6? The CEL came on about 45 minutes after I got some gas (used highest grade). Any ideas? I know nothing about engines.

Thanks in advance.

dogsivew is offline   Reply With Quote
Old 04-17-2011, 04:42 PM   #2
Registered User
 
Steve Tinker's Avatar
 
Join Date: Dec 2008
Location: Queensland, Australia
Posts: 1,522
A couple of questions....

1) Did you feel the engine misfire or just see the CEL illuminate?

2) When Autozone read the codes, were there any other codes listed apart from the 6 ignition missfires?

3) Did Autozone re-set the CEL and has it returned ?

4) How does the car drive - is it running OK now?

The secret is the complete list of CEL codes that Autozone read off - if you can post them it will give a better understanding of the problem.
__________________
2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
Steve Tinker is offline   Reply With Quote
Old 04-17-2011, 05:44 PM   #3
Registered User
 
Join Date: Apr 2011
Location: Alabama
Posts: 7
Thanks Steve.

1) I did not feel the misfire only saw the CEL on the dash. I was traveling on the highway at the time of the CEL, going about 65-70 mph.

2) 7 total codes: p0300-p0306

3) Although he did not say he reset it, the CEL was gone when I left Autozone. It has not come back on, but I haven't driven it very much due to my concerns.

4) Seems to be running fine. Sounds normal on ignition and shifts smoothly.


Can "bad" gas cause this to happen?
dogsivew is offline   Reply With Quote
Old 04-17-2011, 11:45 PM   #4
Registered User
 
Steve Tinker's Avatar
 
Join Date: Dec 2008
Location: Queensland, Australia
Posts: 1,522
If you had bad fuel.you would still be having fault codes and missfires...
I would drive it locally over a few heat cycles (up to full temp and back to full cool mode) and see how she goes.
Isolated glitches are not unknown, but......
__________________
2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
Steve Tinker is offline   Reply With Quote
Old 04-18-2011, 05:05 AM   #5
Registered User
 
Join Date: Apr 2011
Location: Alabama
Posts: 7
I'll give that a try and report back. Thanks.
dogsivew is offline   Reply With Quote
Old 04-18-2011, 10:56 AM   #6
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,573
The ECM detects engine misfire by monitoring the crankshaft speed and detecting variations/fluctuations in the speed. Engine misfire usually results in incomplete fuel burn. This rich condition can result in increased emissions and possible damage to the cat's, and thus, the CEL is illuminated.

Misfire across all 6 cyls generally rules out individual cyl components like spark plugs or coil packs and instead points to a component that is common to all cyls.

The usual likely suspects are the MAF or pre-cat O2 sensors but could be anything from a loose gas cap to a bad coolent temp sensor.

Drive it and see if the CEL returns.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
thstone is offline   Reply With Quote
Old 04-18-2011, 12:49 PM   #7
Registered User
 
Join Date: Apr 2011
Location: Alabama
Posts: 7
"could be anything from a loose gas cap"

Obviously, this is what I hope caused it. I filled up about 30 to 45 minutes before I noticed the CEL. Could have come on soon after I got gas and I didn't notice.

Thanks for the help.
dogsivew is offline   Reply With Quote
Old 04-20-2011, 07:55 PM   #8
Registered User
 
Join Date: Apr 2011
Location: Alabama
Posts: 7
UPDATE:3 days of driving and no CEL. Keeping fingers crossed.

dogsivew is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 11:07 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page