Hello,
I have a 2002 Audi A4 1.8T. i just got my cat replaced. and now when i hit the gas hard the RPM's jump like it was slipping. Its fine most of the time but from time to time it just jumps and there is a power lose. I am wondering if this is a presume issue. is my boost being lost some where? any help would be great. thanks

 

potential vac leak. Any check engine lights on? Studdering or eratic idle?

 

i will do some more testing after work today and see about those two things. i will get back to you tomorrow after i get a better idea of what is affected. thanks

 

ok so i drove around a bit more. but i dont get any check engine lights. Studdering or eratic idle
i ran my VAG-com and this is what i got back.

VAG-COM Version: Release 409.1-S

Chassis Type: 8E - Audi A4 B6
Scan: 01,02,03,08,09,15,16,17,26,36,37,45,46,55,56,63,76

-------------------------------------------------------------------------------
Address 01: Engine
Controller: 8E0 909 518 F
Component: 1.8L R4/5VT G 0001
Coding: 0016701
Shop #: WSC 66565
No fault code found.
Readiness: 0010 1101

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 8E0 614 517 A
Component: ABS/ESP allrad 1726
Coding: 04275
Shop #: WSC 09401
2 Faults Found:
01826 - Sensor for Steering Angle (G85): Supply Voltage Terminal 30
35-10 - - - Intermittent
00778 - Steering Angle Sensor (G85)
27-10 - Implausible Signal - Intermittent

-------------------------------------------------------------------------------
Address 08: Auto HVAC
Controller: 8E0 820 043 G
Component: A4 Klimaautomat 0712
Coding: 00000
Shop #: WSC 63351
1 Fault Found:
00604 - Potentiometer Positioning Motor for Air Flow Flap (G113)
30-10 - Open or Short to B+ - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments
Controller: 8E0 920 950 H
Component: KOMBI+WEGFAHRS. RB4 D26
Coding: 03200
Shop #: WSC 07228
WAULC68E52A168282 AUZ6Z0A0316555
1 Fault Found:
01304 - Radio
49-00 - No Communications


-------------------------------------------------------------------------------
Address 46: Central Conv.
Controller: 8E0 959 433 T
Component: Komfortgerát T5B 0617
Coding: 11820
Shop #: WSC 07228
No Faults Found
or DTCs not supported by controller
or a communication error ocurred