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

LinkBack Thread Tools Display Modes
Old 06-17-2011, 06:24 PM   #1
Registered User
Join Date: Jun 2011
Location: California
Posts: 1
Engine trouble

I have a 2003 Boxster and this morning it had an idle issue where it was surging about 300 rpm. A friend suggested getting some fuel injector cleaner. I did and the check engine light comes on now(would that have to do with the cleaner) the surge seems to have stopped but the car almost stalls when I start in first gear. I read about compressor in ac unit causing a problem like this but the ac is not on. I tried to turn it on and it does not work at all when the engine is on, when I later started the car the fans run before I start the engine but once it is running no fans or ac. Any ideas before I take it to the dealer?

mheintz is offline   Reply With Quote
Old 06-17-2011, 06:35 PM   #2
Registered User
Join Date: Nov 2006
Location: Bastrop, TX
Posts: 705
sometimes the fuel cleaners can irritate and worse, damage the O2 sensors. I think it makes them get too hot or something...

Anyway, if it is not damaged, just confused, it will throw a code and run crappy.
I would unplug the battery for a few hours to clear the code, and this will also reset the Air fuel mapping. If it runs good, but then crappy later with CE light, drive it to autozone or something and they will read out the code to you. I bet it will say O2 sensors.

If this happens, before you run out and get new sensors, @ 100$ x 4, run the gas tank really low, fill up with gas, no additive, and reset the computer again.

you might get lucky.
2002 S
Pedro rear stabilizer bar, CF strut braces, Maxspeed headers with 100 cell cats, Fabspeed cat bypass pipes, H&R springs with M030 setup, TRG rear links, EVO air intake, B&M Short shift kit, Raby IMS upgrade, Raby underdrive pulley
jhandy is offline   Reply With Quote
Old 06-18-2011, 10:50 AM   #3
Registered User
Join Date: Aug 2005
Location: Sanford NC
Posts: 2,376
A contrary view

is that the Pcodes tell why the CEL came on and until you know the Pcodes you are only guessing. Get them read. Your original idle problem could have caused the CEL as much as any additive related cause.

And you don't want to run the fuel tank down to anywhere near empty as that exposes the fuel pump to overheating, just down to 1/4 tank and refilling it will dilute the additive you dumped in before.

mikefocke is offline   Reply With Quote

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 08:46 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