hi all , new member and desperately in need of some help please
had my 2005 mk5 gti engine code axx for around a year and its been running great until the last month or so when i would intermittently lose power once or twice a week almost as if i had turned the ignition off . throttle pedal becomes unresponsive for a few seconds and then it would pick up and drive as normal . at this time i was shown no engine management lights and it happened very rarely . car has not had a remap as far as i know and has covered approx 140k .
now a few weeks on its become near impossible to drive as the sudden loss of power happens all the time anywhere around 3-4k rev range , it is especially bad in 1st , 2nd and 3rd gear on hard acceleration and worse when the engine is up to running temps .
the engine management light did come on in the end .
i've been reading through the i must say very informative threads here for the last week or so and have found a few problems with the car which i have rectified .
diverter vavle was completely shot so have replaced it with the type d revised part
while i was under the car doing the diverter valve i noticed that the wiring to the post cat o2 sensor was damaged so have fitted a new one
checked the camshaft follower for the high pressure fuel pump and was incredibly surprised find there was not one fitted , no remains or anything so just been left out at some time
amazingly the camshaft looks pretty good all things considered but the plunger of the fuel pump has worn very very slightly to one side . obviously i'm going to have to replace this as well but can't see it being the fault at this moment at this time . if been running fine the whole year i've had it and having now fitted a follower i'd expect the pump to working better than without one fitted .
i've removed the throttle pedal and stripped it down to the circuit board and cleaned it out along with the pins that work along the back of the board with electrical cleaner . checked the pins through the plug with a multimeter for continuity and couldnt find anything obviously wrong .
i've replaced the camshaft sensor at the the belt end , bought a cheap obd2 scanner and after deleting all the many codes from me pulling sensors and checking connections and having to replace the battery i was left with p0010 camshaft position actuator a bank 1 circuit malfunction . turns out the sensor was fine but the plug was broken on the other sensor under the engine cover . i have removed the plug and hard soldered directly onto the pins of the sensor and do not have the p0010 code anymore .
i have been out and done 10 miles this evening and the power loss is constantly there , always somewhere between 3-4k under hard acceleration when boost is starting build nicely and the loss it that sudden i have nearly head butted the steering wheel more than once . if i tickle the power its not nearly as bad and in 4th , 5th and 6th it rarely happens . when the engine is cold it is also a lot better . the engine management light has not come back on since bypassing the broken plug to the camshaft sensor and i have no stored faults in the ecu at all .
i'm going to put a fuel filter on tomorrow , recheck all the boost pipes , have a look at the turbo wastegate , check plugs but after that i'm scratching for ideas . the lack of fault codes and engine management light are not helping as i'd expect to see something .
any other things i can check or take a look at before i get it booked in for some live readings ?
sorry a bit long winded but thought i'd give as much info as i could
thanks for taking the time to read and appreciate any help given
steve