car problem in traffic

i have around 29k on my car with no engine mods beside cobb ap and air filter.
when driving in traffic or low speeds of 5-15mph my car gets that pull feel, like when you release the clutch too fast or like im slamming on my brakes. i dont know what its called or how to describe it but any better way.
car is fine at normal speeds but just in traffic or areas where i have to drive slow it seems to be having that problem..

any ideas before i take it to dealer

thanks

Originally Posted by SpecBGuy

i have around 29k on my car with no engine mods beside cobb ap and air filter.
when driving in traffic or low speeds of 5-15mph my car gets that pull feel, like when you release the clutch too fast or like im slamming on my brakes. i dont know what its called or how to describe it but any better way.
car is fine at normal speeds but just in traffic or areas where i have to drive slow it seems to be having that problem..

any ideas before i take it to dealer

thanks

I have this problem, its like the ECU want to be going faster for the gear you are in but you either are on the brakes or coasting with no throttle or brake. It lurched forward then stops like you are stomping the gas then letting off abruptly.

Another question have you noticed any throttle surge lately when the clutch is in while in stop-n-go traffic ??

My guess is the rolling idle speed is mapped to a table that relates to the speedometer and when you just want to creep along, in gear no throttle input but picking up speed, it doesn't like it.

I particularly hate when this happens b/c something in the bell housing make that metal smacking sound

Originally Posted by GEE-OTTO

I have this problem, its like the ECU want to be going faster for the gear you are in but you either are on the brakes or coasting with no throttle or brake. It lurched forward then stops like you are stomping the gas then letting off abruptly.

yes exactly what it feels like and doing..

Originally Posted by GEE-OTTO

Another question have you noticed any throttle surge lately when the clutch is in while in stop-n-go traffic ??

what do you mean by throttle surge

Originally Posted by GEE-OTTO

I particularly hate when this happens b/c something in the bell housing make that metal smacking sound

yea sound like my whole engine is about to fall apart or something.

last time my bro-in-law was with me and he thought i was letting the clutch go too fast but i told him that im not doing anything wrong the car has a mind of its own.
so i guess im not the only one with this problem?

gee-otto are you running on stock ecu or any other map

must be something with the 2.5 engine - I am pro tuned and have the same thing at low speeds, not really worse or better hot or cold but I notice it more when it's cold... others I know including those with 2.5 engines in Impreza's are also and have reported the same stumbling feel, it was not so present in the stock tune but it is now and was the moment it got tuned. It doesn't seem to happen to every car but it is common enough. While it could be annoying I just deal with it, there's no harm happening to the engine.

cool thanks for the info sigmafour as long as im not the only one i guess ill deal with it.

Pretty sure we all have it from time to time. I know I have.

dont think i have had this

Originally Posted by stuck686

dont think i have had this

You must be the lucky few w/o this problem then

there's a few cars that DON'T get this problem under what should be the same conditions - but more than most do... there is no rhyme nor reason for this.

same thing happens to me...i let the clutch out with very little gas and then dont touch the gas and the damn car takes off.

surge!

Is your problem (or should I say OURS ) related to this product description:
http://www.avoturboworld.com/avoshop...207-p-120.html

More stuff to read here too:

http://legacygt.com/forums/showthrea...ad-182559.html

thanks for the links sigmafour. i would have searched before i made this thread but never knew what this problem was called. as long as it doesnt cause damage (which who knows it might be) ill just leave it alone. i dont want to spend money trying new maps, spark plugs, throttle control and etc.

thanks guys

i remember the first couple times this happened to me...

"oh god, faulty accelerator, gonna die!"