Hi
Sorry everyone if I have posted wrong or in the wrong place, this is my first ever post on the internet ever....
I have a 2008 S3 with BHZ engine and have had a strange hesitation since buying it back at the end of January this year.
it is not really noticeable in most gears but is noticeable in 5th and mainly 6th gear and only if you are just maintaining speed or very very gradually accelerating Ie using about a cm of the accelerator pedal.
It starts around 3000 rpm and stops at about 3600 rpm.
If you accelerate using even quarter of the pedal, it drives fine and if you are driving harder , it is flawless.
It is only when holding the car in say 6th gear at around 70-80mph which is around the above revs or in 5th doing the same revs.
it is like a misfire but just a single one every few seconds, like a blip or hesitation for a split second and then another one or two a send or two later ongoing at just this Rev position and with hardly any load / accelerator pedal. Just like maintaining the speed or very gradually increasing speed.
I have changed
Coils for r8 ecs ones
Plugs for ngk71x
Genuine pcv and top/bottom hoses/gasket
Genuine n80 valve
Peirberg d/v
Sealed exhaust cat to rear hole and re fitted a standard rear section with new genuine clamp (was a straight pipe when bought)
I have had no change at all although I did get a coil down with cyl4 misfire code the first week of owning as the car had eBay special coils fitted so they went in the bin and fitted ecs ones.
The new pcv did stop the very slight needle movement on idle but all the above has made no difference to the car whatsoever.
It also drives perfectly if you use more than 1/4 of accelerator pedal in all/any gears
I could continue replacing parts until I have effectively built a new s3 but I was hoping to have left that one to Audi when it was first made.
Unlikely but want to check compression as it is only thing not yet checked really but don’t know how to disconnect the hpfp from sending fuel in as it is cam driven and can’t just be unplugged. Can disconnect in tank plug but it would surely still suck fuel without thaw in tank pump wiring connected ?
many ideas on where to look/ check next. ?
Thanks anyone in advance.
Sorry everyone if I have posted wrong or in the wrong place, this is my first ever post on the internet ever....
I have a 2008 S3 with BHZ engine and have had a strange hesitation since buying it back at the end of January this year.
it is not really noticeable in most gears but is noticeable in 5th and mainly 6th gear and only if you are just maintaining speed or very very gradually accelerating Ie using about a cm of the accelerator pedal.
It starts around 3000 rpm and stops at about 3600 rpm.
If you accelerate using even quarter of the pedal, it drives fine and if you are driving harder , it is flawless.
It is only when holding the car in say 6th gear at around 70-80mph which is around the above revs or in 5th doing the same revs.
it is like a misfire but just a single one every few seconds, like a blip or hesitation for a split second and then another one or two a send or two later ongoing at just this Rev position and with hardly any load / accelerator pedal. Just like maintaining the speed or very gradually increasing speed.
I have changed
Coils for r8 ecs ones
Plugs for ngk71x
Genuine pcv and top/bottom hoses/gasket
Genuine n80 valve
Peirberg d/v
Sealed exhaust cat to rear hole and re fitted a standard rear section with new genuine clamp (was a straight pipe when bought)
I have had no change at all although I did get a coil down with cyl4 misfire code the first week of owning as the car had eBay special coils fitted so they went in the bin and fitted ecs ones.
The new pcv did stop the very slight needle movement on idle but all the above has made no difference to the car whatsoever.
It also drives perfectly if you use more than 1/4 of accelerator pedal in all/any gears
I could continue replacing parts until I have effectively built a new s3 but I was hoping to have left that one to Audi when it was first made.
Unlikely but want to check compression as it is only thing not yet checked really but don’t know how to disconnect the hpfp from sending fuel in as it is cam driven and can’t just be unplugged. Can disconnect in tank plug but it would surely still suck fuel without thaw in tank pump wiring connected ?
many ideas on where to look/ check next. ?
Thanks anyone in advance.
