2004 Forester - What's with the "lumpy" acceleration?

H

H

I've got 4000km on my 2004 Forester 2.5XS (5spd manual). Moderate
acceleration from 2600rpm through about 3700rpm is lumpy. Lumpy is probably
the best way to describe it. Whatever it is, it is definately not smooth
acceleration. Operating and shifting at 4000+rpm, the engine sounds
strained, like it's time to shift. Occasionaly I have noticed rough idle
when sitting at a stop light. Any ideas?

My 90 Legacy with 2.2 (5spd manual) certainly doesn't have this lumpy
acceleration and the shift rpms I use in it are 2500 - 3300rpm, depending on
acceleration requirements. The 2.2, though 15years and 180,000km older feels
like it produces better and smoother power, even in the heavier car. mmm?
 
My 2000 Forester 70,000 miles has never had this problem. A bad load of gas
???
 
clogged fuel filter?... After 4000km, doubtful. I have always gotten gas
from the same high-volume supplier. Never had problems with my other
vehicles.
 
reset the ecu by disconnecting battery and waiting for a while. then
test drive again.

ken
 
Are you running the A/C? The A/C will bog down my Outback H6 in the mid RPM
range.

Brian.
 
Brian said:
Are you running the A/C? The A/C will bog down my Outback H6 in the mid RPM
range.

Brian.
Hi,
You mean tach needle is not steady when idling?
Then something is not right.
Tony
 
Hi,
When a/c comes on ECU automatically compesates raising rpm. What do you
mean bogging down? You can hear and feel a/c compressor engage but
it shouldn't bog the eingine down. some cars temporarily disengage
a/c compressor clutch when quick acceleration is called for.(like passing)
Tony
 
H said:
I've got 4000km on my 2004 Forester 2.5XS (5spd manual). Moderate
acceleration from 2600rpm through about 3700rpm is lumpy. Lumpy is probably
the best way to describe it. Whatever it is, it is definately not smooth
acceleration. Operating and shifting at 4000+rpm, the engine sounds
strained, like it's time to shift. Occasionaly I have noticed rough idle
when sitting at a stop light. Any ideas?

My 90 Legacy with 2.2 (5spd manual) certainly doesn't have this lumpy
acceleration and the shift rpms I use in it are 2500 - 3300rpm, depending on
acceleration requirements. The 2.2, though 15years and 180,000km older feels
like it produces better and smoother power, even in the heavier car. mmm?
are you using the proper octane of gas??
 
are you using the proper octane of gas??

I'm using 87 octane as required. No pinging or other signs of octane
problems.
I'm about 1500km from it's initial 6K service so we'll try to sort out some
of the little nags the vehicle has. My console power outlet doesn't work
either.
 
Are you using 87 octane? I tried premium gas once and my performance
was shot. Took two fill-ups to restore back to normal.
 

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