Help needed for newbie!
 

Hey all,

Im new to the forum.

I have brought an Audi A4 B5 1998 wagon (1.8L)

I brought it with some problems, however there is one I can't work out.
There is a slight shudder/misfire at idle. The mechanic I took the vehicle to has checked the injectors, the coil pack, leads and plugs were changed.

I am yet to check the MAF and underneath the rocker cover for sludge build up.

Today I noticed a bit of a tappet noise as well.

More information regarding the shudder/misfire:
Only present at idle
When accelerating it disappears
There is a slight bit of lag when under heavy acceleration
Stalls on cold start
Small amount of engine movement at idle

The car has 180000kms on it and I have added a valve lifter additive to try and free what I think may be a stuck hydraulic tappet.

The mechanic said there was a slight decrease in pressure in cylinder 3 at start up also.

I am yet to do an oil and filter change because I would like feedback beforehand.

Thanks,

I look forward to the response of the forum

I got hold of a VAGCOM scanner today and found the following codes, could someone decode them for me:

VAG-COM Version: Release 409.1-US

Control Module Part Number: 8D0 907 558 B
Component and/or Version: 1,8L R4/5V MOTR HS D03
Software Coding: 04001
Work Shop Code: WSC 06325
10 Faults Found:
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent
01120 - Shareware Version. To Decode all DTCs
04-10 - Please Register/Activate - Intermittent
01165 - Shareware Version. To Decode all DTCs
17-10 - Please Register/Activate - Intermittent
17972 - Throttle Actuator (J338): Under-Voltage during Basic Setting
P1564 - 35-10 - - - Intermittent
17967 - Shareware Version. To Decode all DTCs
P1559 - 35-10 - Please Register/Activate - Intermittent
01249 - Shareware Version. To Decode all DTCs
26-10 - Please Register/Activate - Intermittent
01250 - Fuel Injector for Cylinder 2 (N31)
26-10 - Output Open - Intermittent
01251 - Shareware Version. To Decode all DTCs
26-10 - Please Register/Activate - Intermittent
01252 - Shareware Version. To Decode all DTCs
26-10 - Please Register/Activate - Intermittent
00515 - Camshaft Position (Hall) Sensor (G40)
30-10 - Open or Short to B+ - Intermittent