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

Reply
 
LinkBack Thread Tools Display Modes
Old 09-07-2011, 08:53 PM   #1
Registered User
 
Join Date: Mar 2011
Location: Portland, OR
Posts: 4
Fuel Issue

Hey guys,

I'll try my best to not make this too long winded. I have a 99 Boxster with the 2.5 motor. The car has 154K on it, but great shape, four owners all checked out on Car Fax. Car has run beautifully until two weeks ago. Suddenly it started missing, radically. Seemed like it was not picking up fuel. I took it to my boys who work on her for general maintenance, they thought it was the sensor for coolant temp that was bad, replaced and no change in the performance. At this time the 986 had 1/4 tank of fuel. I drove it for a few days and the worst occurred. It started sputtering and missing to the point where I had to have it towed back to the shop. They then put in a new Mass Air Flow Sensor with no change. I took it to the Porsche Dealer here in Oregon and they found no errors in the computer and told me to drive it until the check engine light came on again. In the meantime, I filled the car full of premium fuel, injector cleaner and octane booster. It ran perfectly for two days. When I reached 3/4 tank full, I refueled. Here is the key, the second I drove out of the gas station, it sputtered like crazy! Now, it runs, but not well. No one can determine what is wrong. Any advice?

krs2230 is offline   Reply With Quote
Old 09-07-2011, 09:23 PM   #2
Registered User
 
Jager's Avatar
 
Join Date: Jul 2010
Location: California
Posts: 1,815
Garage
Could be the fuel pump.
__________________
Jäger

300K Mile Club
Jager is offline   Reply With Quote
Old 09-08-2011, 05:32 AM   #3
Registered User
 
Join Date: Apr 2011
Location: Warrensburg, MO
Posts: 40
Sounds like

your Mr Fusion isn't getting the necessary 1.21 Gigawatts of power. Have you tired getting up to 88 Mph?

+1 on the fuel pump. I would even take it one step further and replace the fuel filter.

Last edited by 442nd986s; 09-09-2011 at 07:05 AM.
442nd986s is offline   Reply With Quote
Old 09-08-2011, 11:07 AM   #4
Registered User
 
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,160
I just love the fact that the standard test for possible fuel issues is to connect a pressure gauge to the test port in the engine bay for the purpose, and check both fuel pressure and delivery volume, a quick and relatively cheap test, but no one has done this, preferring to swap out expensive parts instead................
__________________
Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
JFP in PA is offline   Reply With Quote
Old 09-08-2011, 06:05 PM   #5
Registered User
 
Jager's Avatar
 
Join Date: Jul 2010
Location: California
Posts: 1,815
Garage
If I recall correctly I did not get a Check Engine Light when my fuel pump failed (~150,000 miles on the odometer). It was an interesting ride home but the Jägermobile did not leave me stranded.
__________________
Jäger

300K Mile Club
Jager is offline   Reply With Quote
Old 09-09-2011, 09:42 AM   #6
Registered User
 
Join Date: Mar 2011
Location: Portland, OR
Posts: 4
Thumbs up

Thanks JFP. So true. All everyone wanted to do was talk electronics. Car now seems to be fixed and running well with the new fuel filter in place.

Quote:
Originally Posted by JFP in PA
I just love the fact that the standard test for possible fuel issues is to connect a pressure gauge to the test port in the engine bay for the purpose, and check both fuel pressure and delivery volume, a quick and relatively cheap test, but no one has done this, preferring to swap out expensive parts instead................
krs2230 is offline   Reply With Quote
Old 09-09-2011, 09:44 AM   #7
Registered User
 
Join Date: Mar 2011
Location: Portland, OR
Posts: 4
Thank you. I changed the fuel filter and it seems to have fixed the problem. Curious, does getting up to 88 mph do something to the systems?

Quote:
Originally Posted by 442nd986s
your Mr Fusion isn't getting the necessary 1.21 Gigawatts of power. Have you tired getting up to 88 Mph?

+1 on the fuel pump. I would even take it one step further and replace the fuel filter.
krs2230 is offline   Reply With Quote
Old 09-09-2011, 09:47 AM   #8
Registered User
 
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,160
Quote:
Originally Posted by krs2230
Thanks JFP. So true. All everyone wanted to do was talk electronics. Car now seems to be fixed and running well with the new fuel filter in place.
And the test I suggested would have caught the low fuel delivery caused by the clogged filter............. Sometimes the simplest approach is the best one; and too many techs have become “sensor dominant” in their thinking……..
__________________
Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein

Last edited by JFP in PA; 09-09-2011 at 09:50 AM.
JFP in PA is offline   Reply With Quote
Old 09-09-2011, 10:15 AM   #9
Registered User
 
Join Date: Nov 2009
Location: Winnipeg MB
Posts: 2,486
" Curious, does getting up to 88 mph do something to the systems?"

Just the flux capacitor, and only in time travel mode.
__________________
'99 black 986
Mark_T is offline   Reply With Quote
Old 09-09-2011, 11:11 AM   #10
Registered User
 
2003S's Avatar
 
Join Date: Aug 2011
Location: Chicago
Posts: 475
Garage
Quote:
Originally Posted by Mark_T
" Curious, does getting up to 88 mph do something to the systems?"

Just the flux capacitor, and only in time travel mode.

http://en.wikipedia.org/wiki/88_MPH

2003S 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 06:54 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