Wonder if anyone can help with a problem I am having with a bkd pd 140 vw mk5 golf on 55 plate (same engine as a3)
Have had the car remapped since purchase 2.5 yrs ago all running fine. Over last month the engine has not felt like it is running right. No fault on vag com.
The car is fine if driven with large throttle on off movements but if the car is driven lightly on the throttle or on cruise control the car pulses on / off. Ie in 3rd gear at 30mph on cruise on the flat or slight decline in road it is if car does not know what to do , power on or off (also been described as bucking) This is also the case when using the pedal. If is usually around 1500 - 2000 rpm.
I have had the remap removed which has made it worse !
I have fitted new egr valve. Also tried part blanking it per a forum tip.
I have tried a new MAF sensor , still same.
Fitted new filters, checked pipes for leaks etc.
I have taken to remap dealer but does not know where to start but tried throttle pedal, still same.
I have paid vw to diagnose fault but are just blaming remap and want £1100 for new ecu before will do anything else !
I have checked injector valves with vag com all seem ok.
Can anyone help ? Anyone know anywhere in South Yorkshire could trust to have a look or offer a little direction with this fault ?
Thanks in advance.