hi all.

i have an problem with my focus rs,

it keeps holding back and being very nervous while driving an consistent speed, its also misfires or something around 5500 rpm, and its doesnt feel like it accelerates consistantly?????

its seems to go aways when you get past 60 mph, or maybe you just dont notice it anymore then,.

does anybody know what causes this????

i already chanched:

ingnition coil,
spark leads
spark plugs,

this only seems the help a little bit

many thanks

roy

 

Sounds like the symptoms of a knackered lambda sensor!

 

Seconded.

 

ok, thx, ill have a go with the lambda then

 

Sounds like the AF cough to me...

 

and what is the AF cough??

 

can anyone tell me wath the "AF cough" is??

 

Never heard of it!!! Have you tried a new lambda sensor yet?

 

On some FRS which have the AF base ecu map on, the car is known to misfire/hesitate when the car hits around 4.5k revs - the more you mod the car the worse the misfire can get

 

sounds like af to me as well - get it to NMM!

 

it does it around 2.5k, im thinking about the dumpvalve,

 

no havent tried it yet, but i will soon

 

They aint got a clue what your talking about on here Big Dave