over boost

[arman123]

just had my dash light up emmission control light and no pull on the car at all car is audi a4 115 pd engine 2004 took it to the garage and he hooked it up to the computer and fault code was over boosting so the engine whent into saftey mode he said he reset it for me and drives fine but he goes if goes again it could be sloiniod valve anybody had this problem love to here how you sorted it out thanks

[churp]

solenoid valve underneath airbox area fixed the same problem with mine as yours

[arman123]

thanks for that will get it changed if happens again when you had this problem how often did it happen till you got the valve changed

[churp]

it used to go into reduced/ limp home mode whenever i hit about 50-60 mph, i had full boost all through the gears below this speed but when it got to this speed, it went into limp home and wouldnt come out until engine restarted. i had the air mass meter changed, made no difference, i had the vanes on the turbo checked to see if clogged up, no difference, check all boost pipes/ connections etc, cleaned egr valve, no difference, replaced the valve in question, (think its called n75 valve or might be n18 valve), fault codes all removed as had boost fault, i think it was overboost, but either way it was this valve that caused all that problem and the part is only about £30 !!
hope this helps

[arman123]

got it booked it to the garage tommorrow morning don it to me again today at low speeds abs light came on aswell no boost restarted it and fine funny cars i tell ya let you wat happens anyway probably the valves

[churp]

yeah that'll be good to know.

[arman123]

got the valve changed and the car fine now boosting properly