I have an S3 BAM, the other day out of the blue the idle went bad and so did the brake pedal. On inspection I found plastic vacuum line under inlet manifold split and come off of valve, I temp repaired with duct tape until I could replace the following day.
After replacing with genuine pipes the boost started playing up.....as in when on boost it cuts in and out quite harshly, when the boost drops it sounds like it back fires from the exhaust, I inspected again and found rubber hoses under inlet had collapsed so replaced all including elbow from oil cooler, T-piece, pcv valve and hose off of pcv valve.
This did not solve the issue, I have also swapped N75 and DV from my other 1.8T ARY again did not solve. I tried maf unplugged, still no better. It also smokes from the exhaust when hot - this comes and goes intermittently with no pattern.
Whilst playing around under the bonnet last night i noticed the oil cap dancing when left loose - decided to drive with oil cap off and drove like a new car, no boost issues at all but still smoke from exhaust when hot, in one last attempt i fitted new suction jet pump thinking this was the only thing left but didn't make any difference , oh and also in amongst all this i replaced spark plugs and carried out boost leak test., i'm all out of ideas so really would appreciate some help, thanks
PS i bought car in Jan this year, drove perfect until now - it was remapped to 250bhp by previous owner with print out,
After replacing with genuine pipes the boost started playing up.....as in when on boost it cuts in and out quite harshly, when the boost drops it sounds like it back fires from the exhaust, I inspected again and found rubber hoses under inlet had collapsed so replaced all including elbow from oil cooler, T-piece, pcv valve and hose off of pcv valve.
This did not solve the issue, I have also swapped N75 and DV from my other 1.8T ARY again did not solve. I tried maf unplugged, still no better. It also smokes from the exhaust when hot - this comes and goes intermittently with no pattern.
Whilst playing around under the bonnet last night i noticed the oil cap dancing when left loose - decided to drive with oil cap off and drove like a new car, no boost issues at all but still smoke from exhaust when hot, in one last attempt i fitted new suction jet pump thinking this was the only thing left but didn't make any difference , oh and also in amongst all this i replaced spark plugs and carried out boost leak test., i'm all out of ideas so really would appreciate some help, thanks
PS i bought car in Jan this year, drove perfect until now - it was remapped to 250bhp by previous owner with print out,
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