jordan.a4
07-02-2016, 09:35 PM
Hi everyone. I've searched up and down the forum can't seem to figure the problem out.
Car: 2006 Audi A4 2.0T S-Line CVT
Background:
When I first bought the car about two years ago the owner complained about the car driving shittily, had some very bad hesitation issues and tons of codes. Well pulled the HPFP apart and voila the cam follower worn through. I have replaced the intake cam, high pressure fuel pump, cam follower, diverter valve (upgraded to the DV+), PCV, rear breather hose, air filter, MAF, cam position sensor, starter motor, and spark plugs (all brand new). That remedied the problem, the car drove fine for about a year and a 3/4 perfectly (slower than what online states (its a CVT I was getting 8.7s to 60 vs 7.8-8.0s to 60). I noticed the thermostat needed to be replaced when it got closer to winter time (got really cold in january-february not so much December).
Problem:
Soon as i took the car out and warmed it up, it had a throttle cut at high RPM (5000+ in 3rd gear+). When throttle cutting the RPM stays the same but the MPH moves extremely slowly or not at all, releasing the throttle and reapplying fixes it. When shifting manually sometimes when in gear and getting ready to race (3500-4000RPM at 15 MPH roll) it will not move RPM and "throttle cut". The EPC light comes on sometimes when it throttle cuts, but not all the time (about 60% of the time the EPC light comes on).
Codes:
The codes show up in three groups.
1st way:
P0171 system too lean (bank 1)
P0299 turbo/supercharger Underboost "A" condition
2nd way:
P0171 system too lean (bank 1)
3rd way:
P0299 turbo/supercharger Underboost "A" condition
P0171 system too lean (bank1)
P0341 camshaft position sensor circuit range/performance
P0011 (pending) "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
P0089 (pending) fuel pressure regulator
The throttle cuts will happen without the CEL come on. I can drive around for 2-3 hours and have no codes but have throttle cuts.
Extra information:
It sometimes does not throttle cut but will have a hesitation at higher RPM. It will stay at 5900-6300 rpm for longer than usual (2-5 secs) and until it switches gear MPH won't move.
Fuel rail pressure is 1600-1700 PSI.
Catalytic converter is 700-800°C
Car NEVER fuel cut before thermostat change.
Different MAF doesn't help
If you are driving in an empty tunnel you can hear a distinct whistle with the turbo. My dad says it sounds fine but he is more of N/A educated. (Has over 30+ years in automotive industry multiple ASE's {also extremely busy so he can't really help me with this issue})
I had a friend drive behind me to see if anything is noticeable. He said it had a small backfire like noise and the exhaust smells like a school bus/test pipe when the throttle cut occurs.
Things that need to be done soon:
Timing belt
CVT tranny flush
Parts I think it might be:
O2 sensor
Thrust sensor
N75 valve
Sorry for the wall of text. Really did not want to post and have it be something simple or something already posted. Just haven't gotten anywhere these last few months and can't diagnose it. I have done about two oil changes since the problem started. Thanks in advance!
Sent from my Nexus 6 using Tapatalk
Car: 2006 Audi A4 2.0T S-Line CVT
Background:
When I first bought the car about two years ago the owner complained about the car driving shittily, had some very bad hesitation issues and tons of codes. Well pulled the HPFP apart and voila the cam follower worn through. I have replaced the intake cam, high pressure fuel pump, cam follower, diverter valve (upgraded to the DV+), PCV, rear breather hose, air filter, MAF, cam position sensor, starter motor, and spark plugs (all brand new). That remedied the problem, the car drove fine for about a year and a 3/4 perfectly (slower than what online states (its a CVT I was getting 8.7s to 60 vs 7.8-8.0s to 60). I noticed the thermostat needed to be replaced when it got closer to winter time (got really cold in january-february not so much December).
Problem:
Soon as i took the car out and warmed it up, it had a throttle cut at high RPM (5000+ in 3rd gear+). When throttle cutting the RPM stays the same but the MPH moves extremely slowly or not at all, releasing the throttle and reapplying fixes it. When shifting manually sometimes when in gear and getting ready to race (3500-4000RPM at 15 MPH roll) it will not move RPM and "throttle cut". The EPC light comes on sometimes when it throttle cuts, but not all the time (about 60% of the time the EPC light comes on).
Codes:
The codes show up in three groups.
1st way:
P0171 system too lean (bank 1)
P0299 turbo/supercharger Underboost "A" condition
2nd way:
P0171 system too lean (bank 1)
3rd way:
P0299 turbo/supercharger Underboost "A" condition
P0171 system too lean (bank1)
P0341 camshaft position sensor circuit range/performance
P0011 (pending) "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
P0089 (pending) fuel pressure regulator
The throttle cuts will happen without the CEL come on. I can drive around for 2-3 hours and have no codes but have throttle cuts.
Extra information:
It sometimes does not throttle cut but will have a hesitation at higher RPM. It will stay at 5900-6300 rpm for longer than usual (2-5 secs) and until it switches gear MPH won't move.
Fuel rail pressure is 1600-1700 PSI.
Catalytic converter is 700-800°C
Car NEVER fuel cut before thermostat change.
Different MAF doesn't help
If you are driving in an empty tunnel you can hear a distinct whistle with the turbo. My dad says it sounds fine but he is more of N/A educated. (Has over 30+ years in automotive industry multiple ASE's {also extremely busy so he can't really help me with this issue})
I had a friend drive behind me to see if anything is noticeable. He said it had a small backfire like noise and the exhaust smells like a school bus/test pipe when the throttle cut occurs.
Things that need to be done soon:
Timing belt
CVT tranny flush
Parts I think it might be:
O2 sensor
Thrust sensor
N75 valve
Sorry for the wall of text. Really did not want to post and have it be something simple or something already posted. Just haven't gotten anywhere these last few months and can't diagnose it. I have done about two oil changes since the problem started. Thanks in advance!
Sent from my Nexus 6 using Tapatalk