Nobody cant find what is wrong with my A4 1.8TQ B6

[romfeo]

I am having a bunch of troubles with my B6 1.8TQ and my trusted mechanic said he can't do anything about it... Looking for ideas before I start pouring more money into it...

Symptoms
1. Difficult to start. It cranks but it may take 5-10 cranks before the engine starts
2. Idle is not smooth... Its not rough, but it is not smooth either
3. Lack of power. The car does not run like it use to. E.g. For a steep upward slope that I used to drive with second gear, I now need to put the 1st gear, or the engine is on the brink of stalling.

Codes
17987 - Throttle Actuator: Adaptation Not Started
16725 - Camshaft Position Sensor: Implausible Signal

What has been checked/ tried
1. The mechanic has triple checked that the car is properly timed. The 16725 does not go away. Problems remain
2. We have tried two other camshaft position sensors. The 16725 does not go away. Problems remain
3. We have checked the wiring to the camshaft sensor. They are ok.
4. It is impossible to adjust the throttle body. Tried with the official audi diagnostic software (that is what they've told me. The dealer's electrician mechanic visited my mechanic.)
5. Replaced the throttle body. The 17987 does not go away. Problem remains.
6. Wiring to the throttle body also seems ok.
7. Fuel filter is brand new.
8. MAF sensor is clean
9. Fuel pump's pressure tested and it seems ok.
10. New coils and spark plugs are installed.
11. Cooling system works perfectly.
12. Checked the relays in the ECU compartment
13. Checked all fuses.
14. Battery is charged and in good health


What is yet to be explored
1. Some wires that go to the coils seems corroded... In the next round I will replace/ repair the harness that goes to the coils.
2. Could it be an ECU problem?
3. Replace fuel pump, just to be sure that it not sticking

If you have any ideas, please reply...
Thanks

[PetrolDave]

It would make it a lot easier suggest things to investigate if you post a full unedited VCDS Auto-scan.

[romfeo]

I don't own vcds... The codes were pulled from a another scanner

[PetrolDave]

I don't own vcds... The codes were pulled from a another scanner

Since this forum exists to help VCDS owners that may be a problem ...

Have you tried asking on Audi owners forums? They will have knowledge specific to your B6 A4 which may be helpful.

[romfeo]

Well the category of the forum I have posted in, is for cases where vcds isn't available at all...

[Uwe]

Well the category of the forum I have posted in, is for cases where vcds isn't available at all...

Not really. It's not for cases where VCDS isn't available. It's for cases where VCDS isn't applicable.

This forum exists for VCDS users.

-Uwe-

[Jack@European_Parts]

Did you consider getting a VCDS system and an RTFB to trace the WD while making use of advanced VCDS blocks, "once procured" & to check the G40 or shared circuits with a decade box?

Been here:

http://wiki.ross-tech.com/wiki/index...5/P0341/000833

http://wiki.ross-tech.com/wiki/index...7/P1579/005497

JPPSG is free no?.........

https://forums.ross-tech.com/showthr...uot-JPPSG-quot

Isn't RTFB is here?.....

http://wiki.ross-tech.com/wiki/index...ir_Information

Ever play load lights?



When you get your authorized VCDS comporting system, please post the scan as instructed in this video below, okay?






Since no one else can figure it out, I strongly encourage you to get a VCDS system and engage us, so we can help you join the collective, with a solution which is most likely!