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Subaru Forester Speed Control/RPM Surge Problems

23 messages,  Last post on Aug 02, 2010 at 1:17 PM

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What is this discussion about? Subaru Forester

Messages Page 3 of 3

#14 of 23 Re: 2005 Outback [orangelebaron] by aatherton

Dec 07, 2009 (1:24 pm)

Replying to: orangelebaron (Dec 01, 2009 5:52 pm)
"... I recently started having a surging issue... at stop signs and lights... Are these symptoms the same as what you guys are talking about?..."
 
That is nothing like what I have, which does not concern me at all. When coasting against light throttle, my engine alternates between light gas and no gas, never getting more gas than I am giving it. It is the opposite of a surge.
 
You have something else. It sounds like your engine gives itself gas, more gas than you are giving it with the throttle. Now that is a surge.

#15 of 23 Re: 2005 Outback [aatherton] by johnv STAFF

Dec 08, 2009 (4:50 pm)

Replying to: aatherton (Dec 07, 2009 1:24 pm)
I have the same (08 Forester PZEV) when coasting on light throttle. It is either on or off. Not a surge, but doesn't make for a smooth ride. I guess you just can't feather the gas like you can when its a physical wire to the throttle.

#16 of 23 Power loss and hesitation while driving 08 XT by dealerdefiance

Dec 16, 2009 (10:25 am)

I really need some help figuring this out. I have 08 XT, auto, that was bought new and now have 52k miles. It periodically has this problem where it will cut out power and feel like it is missing or something. This typically happens while driving about 65 - 70 mph, and the rpms around 2200 - 2500. It generally happens while driving up a very slight incline of a hill (I drive 50 miles each way on this hilly hwy) I thought it was contaminated fuel initially and put fuel treatments in but that did not stop the problem then I had a tune up done by Firestone thinking I just needed new plugs but it is still doing it. Could this be my transmission possibly? I also noticed that when this happens the rps do not go down at all and thats why I think it may be the trans. Please help!

#17 of 23 Re: 2005 Outback [johnv] by imaginary

Jan 31, 2010 (1:49 pm)

Replying to: johnv (Dec 08, 2009 4:50 pm)
Just curious: what is/was your current mileage?

#18 of 23 Re: 2005 Outback [imaginary] by johnv STAFF

Feb 01, 2010 (12:08 pm)

Replying to: imaginary (Jan 31, 2010 1:49 pm)
I'm at about 13k miles. I had a reflash done to the ECM that solved a problem with the idle racing when the clutch was in. I haven't gone in for the WVN-24 ECM reflash, but for all I know it could be one and the same.
 
I haven't particularly noticed the binary throttle issue since the reflash, but I'll try to remember to watch for it next time I'm on the downhill.

#19 of 23 Re: 2005 Outback [johnv] by johnv STAFF

Feb 08, 2010 (1:04 pm)

Replying to: johnv (Feb 01, 2010 12:08 pm)
The reflash seems to have made the throttle less blippy when coming on/off gas at low speeds (coasting up to a stop for example). I never had/noticed any problem at higher speeds (freeway, etc).

#20 of 23 2009 Forester by subie_ottawa

May 03, 2010 (6:19 am)

My Forester surges whenever the clutch is pushed in and you are coasting. It will pulse between 1000 and 2200 rpm but on occasion has gone over 3000 rpm. It stops surging when you come to a stop or if you move the shifter to the neutral position.

#21 of 23 Re: 2009 Forester [subie_ottawa] by whiteoakbayou

Jul 24, 2010 (4:33 pm)

Replying to: subie_ottawa (May 03, 2010 6:19 am)
My 09 Forester X Premium 5-speed manual does the same exact thing. And the transition from off throttle to on throttle is practically impossible to modulate smoothly.
 
Does anybody know the fix?
 
Does it have anything to do with a too hot thermostat? It acts like it's running hot, but I can't tell because it has no guage. When it's still warming up, not totally up to full temp but not cold, it runs perfectly.

#22 of 23 Re: 2009 Forester [whiteoakbayou] by subie_ottawa

Jul 28, 2010 (3:56 pm)

Replying to: whiteoakbayou (Jul 24, 2010 4:33 pm)
Took my Forester in again and they reprogrammed the ECU with an update and problem solved!

#23 of 23 Re: 2009 Forester [subie_ottawa] by ateixeira

Aug 02, 2010 (1:17 pm)

Replying to: subie_ottawa (Jul 28, 2010 3:56 pm)
Glad to hear it.
 
I was going to ask if yours is a PZEV, but it's a moot point now. PZEV will drop revs slowly for emissions purposes, but what you describe did not sound normal anyway.

Messages Page 3 of 3

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