ChristianSwe
Registered User
Hi everyone!
I have an Audi S3 8p, year 2008 with engine code BHZ that seems to have some performance issues since it doesn't seem, or feel atleast to pull as hard as it did when I got the car. Seems that the turbo/power is kicking in at higher rpms like 4000 rpms or so. A few weeks after I got the car it was idling and all of a sudden just stalled and when doing so it was difficult to start the car. After this happened the car didn't feel as powerful after that. It hasn't stalled any more or thrown any DTCs.I also had a battery drain issue after I bought the car and my question is that let's say the car was tuned to stage 1 and if the battery drained out would it revert back to stock map? Because if so then that could be the issue as to why the car isn't as powerful as it were because I don't know or have proof that the car was tuned or not when I bought it.
I've also got a weird rattlesnake noise when doing a hard acceleration which you can hear in the video that I've linked in this thread. Would an open air intake cause this noisy "rattlesnake" sound? (Don't mind the rattle noise in the beginning of the video since the blower fan in cabin is noisy).
Beside that I also sometimes(not very often) receives a DTC for a misfire and when reading live data with OBDeleven and VCDS I can see that the misfire counter is counting on cylinder 2 and 3 when car is idling which you can also hear from the exhaust if you're close to the rear of the vehicle since it's sputtering a little. Perhaps this issue is connected to carbon build-up or faulty injectors?
Down below you will see what repairs and mods that have been done.
Mods:
Revo open air intake
DV+ diverter valve (performance issue and rattlesnake noise was there with the upgraded oem DV also)
Repairs:
Replaced PCV with an aftermarket one(have ordered a oem from maindealer)
spark plugs
ignition coils
MAF
These repairs didn't help with this issue.
What repairs is coming for this car?
I will do a carbon cleaning(walnut blasting) and have also ordered new gaskets and 2 new injectors for cyl 2 and 3 just in case
Replace the PCV again with oem from maindealer.
Replace fuel pressure valve with RS4 valve (If i want to go stage 2+)
Replace the piston for the HPFP.
Upgrade the clutch to a Sachs performance cluth kit that should be good for around 550 Nm and good for daily driving also.
Replace the rear breather/pcv hose with oem
Try with another new oem DV
Link to video for the "rattlesnake noise":
https://streamable.com/p6c1j1
So what do you all think could be the issue to the performance, slight misfire on idle and the "rattlesnake" sound?
Best regards,
Christian
I have an Audi S3 8p, year 2008 with engine code BHZ that seems to have some performance issues since it doesn't seem, or feel atleast to pull as hard as it did when I got the car. Seems that the turbo/power is kicking in at higher rpms like 4000 rpms or so. A few weeks after I got the car it was idling and all of a sudden just stalled and when doing so it was difficult to start the car. After this happened the car didn't feel as powerful after that. It hasn't stalled any more or thrown any DTCs.I also had a battery drain issue after I bought the car and my question is that let's say the car was tuned to stage 1 and if the battery drained out would it revert back to stock map? Because if so then that could be the issue as to why the car isn't as powerful as it were because I don't know or have proof that the car was tuned or not when I bought it.
I've also got a weird rattlesnake noise when doing a hard acceleration which you can hear in the video that I've linked in this thread. Would an open air intake cause this noisy "rattlesnake" sound? (Don't mind the rattle noise in the beginning of the video since the blower fan in cabin is noisy).
Beside that I also sometimes(not very often) receives a DTC for a misfire and when reading live data with OBDeleven and VCDS I can see that the misfire counter is counting on cylinder 2 and 3 when car is idling which you can also hear from the exhaust if you're close to the rear of the vehicle since it's sputtering a little. Perhaps this issue is connected to carbon build-up or faulty injectors?
Down below you will see what repairs and mods that have been done.
Mods:
Revo open air intake
DV+ diverter valve (performance issue and rattlesnake noise was there with the upgraded oem DV also)
Repairs:
Replaced PCV with an aftermarket one(have ordered a oem from maindealer)
spark plugs
ignition coils
MAF
These repairs didn't help with this issue.
What repairs is coming for this car?
I will do a carbon cleaning(walnut blasting) and have also ordered new gaskets and 2 new injectors for cyl 2 and 3 just in case
Replace the PCV again with oem from maindealer.
Replace fuel pressure valve with RS4 valve (If i want to go stage 2+)
Replace the piston for the HPFP.
Upgrade the clutch to a Sachs performance cluth kit that should be good for around 550 Nm and good for daily driving also.
Replace the rear breather/pcv hose with oem
Try with another new oem DV
Link to video for the "rattlesnake noise":
https://streamable.com/p6c1j1
So what do you all think could be the issue to the performance, slight misfire on idle and the "rattlesnake" sound?
Best regards,
Christian