Pulsing Acceleration
#1
Registered User
Thread Starter
Join Date: Jun 2009
Location: up in them guts.
Posts: 837
Car Info: 2008 Forester XT Sports
Pulsing Acceleration
I have a 2008 Forester XT auto, cobb access port, downpipe, and a protune. While accelerating, giving it a good bit of fuel, the car will pulse in rpm up and down. Each pulse up and down is about a second long up, down, up down, until you either bury the gas pedal or remove your foot from the gas. It only happens while the car is tuned -- both the cobb over the counter tune and the pro tune have the same results. has anyone had the same problem before?
#4
Registered User
Thread Starter
Join Date: Jun 2009
Location: up in them guts.
Posts: 837
Car Info: 2008 Forester XT Sports
California. we all ***** about 40, likes its the end of the world. no ice or snow.
i hear a noise when i start that sounds like the fuel pump is bubbling. granted it goes every time and has nothing to do with the tune, but maybe its fuel related?
i hear a noise when i start that sounds like the fuel pump is bubbling. granted it goes every time and has nothing to do with the tune, but maybe its fuel related?
Last edited by cracker1252; 02-08-2016 at 09:01 PM.
#5
Registered User
Thread Starter
Join Date: Jun 2009
Location: up in them guts.
Posts: 837
Car Info: 2008 Forester XT Sports
update: removed the tune. got 105k and 120k service done, everything that was touched was replaced. not that suggested dealer crap. turned the tune back on to stage 1, otc. works great now. no pulsing. i have no idea what it could have been. putting the dp back on this weekend. we will see.
#8
Registered User
Thread Starter
Join Date: Jun 2009
Location: up in them guts.
Posts: 837
Car Info: 2008 Forester XT Sports
800 people have looked and not one other person has this issue? amazing.
i have a 2008 AUTOMATIC XT. full exhaust, and when you pull light in high gears, is pulses up and down like its starving. my guess is fuel related. could this be the cause? perhaps the injectors cant handle the change in output? anyone?
i have a 2008 AUTOMATIC XT. full exhaust, and when you pull light in high gears, is pulses up and down like its starving. my guess is fuel related. could this be the cause? perhaps the injectors cant handle the change in output? anyone?
Thread
Thread Starter
Forum
Replies
Last Post
DerekB707
Bay Area
33
10-06-2010 09:03 PM
DJ Catchem
Engine/Power - EJ20T (pre-2006 WRX and JDM)
12
12-15-2003 03:50 PM
DJ Catchem
Engine/Power - EJ20T (pre-2006 WRX and JDM)
5
11-16-2003 01:33 PM
DJ Catchem
Engine/Power - EJ20T (pre-2006 WRX and JDM)
3
11-10-2003 06:27 AM