Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 06-17-2010, 03:44 PM   #1
Registered User
 
Join Date: Nov 2009
Location: Greenville SC
Posts: 85
Filler hose leak

The Porsche dealer wants to do an air leak test due to CEL I get occasionally at or near redline. The Fault is misfire cylinder 1 and 4. I changed the oil the other day and found I have a leak somewhere in the filler hose. Knowing that the there is a vacum on the oil cap when the car is running that has something to do with the AOS, could this be the leak they are looking for?
__________________
1997 Boxster 986
TechArt Championship Formula OZ Wheels,
TechArt Springs
TechArt Strut Brace Front and Rear
Technobrace (Thanks Pedro)
Michelin PS2
G2 Red Caliper Paint
DamageINC123 is offline   Reply With Quote
Old 06-17-2010, 03:54 PM   #2
Registered User
 
jcb986's Avatar
 
Join Date: Apr 2009
Location: Orlando
Posts: 1,266
If it's the AOS, it will be very hard or nearly impossible to remove the oil cap while the engine is running. Do you have any blue smoke coming out of the exhaust. When I replaced mine I had just a very light smoke, hardly noticeable. I could not remove the oil filler cap while engine was running. When I replaced it, the boot on the bottom of the AOS was dramatically pinched in and could have been causing my problem. The AOS comes complete and runs around $120.00. Any vacuum leak will cause problems with engines running performance. They are the hardest to find.
__________________
http://i768.photobucket.com/albums/x...6/PC120055.jpg

Old Hippie Young Heart
2000 S/3.2 Liter/Tiptronic/Boxster S Sport Package/Cruise Control/Slate Grey Metallic
Red Special Leather Interior/Red Floor Mats/Red Hand Painted Instrument Dials/Roll Bar/Windstop
Small Carbon Package/Leather Wrap Carbon Wheel/Center Console Exterior Color/Alum Carbon Shift Knob
AM/FM Radio w/CD Player & Changer/Digital Sound Package/18" Turbo Wheels/Wheel Caps w/Colored Crest
jcb986 is offline   Reply With Quote
Old 06-17-2010, 05:21 PM   #3
Registered User
 
Join Date: Oct 2008
Location: San Diego
Posts: 434
Have you checked the dipstick tube? I've seen several posts about people breaking theirs...
__________________
1999 Carrera 4 Aero kit 4" UD Pulley
My Corvette doesn't leak oil... it sweats horsepower.
sd_boxster is offline   Reply With Quote
Old 06-17-2010, 06:35 PM   #4
Registered User
 
Join Date: Nov 2009
Location: Greenville SC
Posts: 85
No smoke no broken dipstick. The AOS is fine and the oil cap does have a vacum when trying to remove the cap. What I am trying to hunt down is a CEL giving me a misfire code at very high RPM. I have been told its a possible air leak.
When I changed the oil the filler neck on the inside of the engine was wet with new oil and dripping. I wipped it off and no problem since. However, in order to leak, it must be cracked or pulled loose which from what I have read can happen.

And Yes, my plugs have been changed and coil packs swapped. They are snapped in place and not loose.
__________________
1997 Boxster 986
TechArt Championship Formula OZ Wheels,
TechArt Springs
TechArt Strut Brace Front and Rear
Technobrace (Thanks Pedro)
Michelin PS2
G2 Red Caliper Paint

Last edited by DamageINC123; 06-17-2010 at 06:37 PM.
DamageINC123 is offline   Reply With Quote
Old 06-18-2010, 04:20 AM   #5
Registered User
 
jcb986's Avatar
 
Join Date: Apr 2009
Location: Orlando
Posts: 1,266
OK, I assume you have a mild vacuum at the oil filler cap and it came be removed while the engine is running fairly easily. If not, you may have a vacuum leak still in the line. The top J-tube has o-ring seals at both ends and the bottom tube also has seals at both ends. The tubes them self can crack since they are plastic. What year is you Boxster and how many miles on it.
__________________
http://i768.photobucket.com/albums/x...6/PC120055.jpg

Old Hippie Young Heart
2000 S/3.2 Liter/Tiptronic/Boxster S Sport Package/Cruise Control/Slate Grey Metallic
Red Special Leather Interior/Red Floor Mats/Red Hand Painted Instrument Dials/Roll Bar/Windstop
Small Carbon Package/Leather Wrap Carbon Wheel/Center Console Exterior Color/Alum Carbon Shift Knob
AM/FM Radio w/CD Player & Changer/Digital Sound Package/18" Turbo Wheels/Wheel Caps w/Colored Crest
jcb986 is offline   Reply With Quote
Old 06-18-2010, 05:19 AM   #6
Registered User
 
Join Date: Nov 2009
Location: Greenville SC
Posts: 85
The oil cap can be removed but I can feel the vacum when the engine is running. I dont know how much vacum because I have never compared it to another boxster but its definitely tougher when the engine is on.

97 with 33,000 miles
__________________
1997 Boxster 986
TechArt Championship Formula OZ Wheels,
TechArt Springs
TechArt Strut Brace Front and Rear
Technobrace (Thanks Pedro)
Michelin PS2
G2 Red Caliper Paint
DamageINC123 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 09:14 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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