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Fuel trim way off. Too lean on both banks Touareg 3.2 V6

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fuel pump failure fuel pump filter fuel trim lean condition
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#21 ·
And here is the first list of measuring block:

By group:
Group 1 - Field 0 Group 39 - Field 0 Group 39 - Field 1 Group 39 - Field 2 Group 42 - Field 0 Group 42 - Field 2 Group 43 - Field 1 Group 44 - Field 1 Group 46 - Field 1 Group 46 - Field 2

Or by name in advanced measuring blocks.
Engine Speed
Mass Airflow
Bank 1 - Sensor Voltage
Bank 2 - Sensor Voltage
Bank 2 Sensor 1 - Heater Resistance
Bank 2 Sensor 2 - Heater Resistance
Bank 1 behind - CAT Temperature
Bank 2 behind - CAT Temperature

Thanks.
 
Discussion starter · #22 ·
I cant find the change-over valve. Do i need to remove stuff to get to it?? maybe you can take a picture/video on where to find it exactly.:nerd:



TRespect said:
You can post an autoscan so we can help with the errors and learn.
I'll give you some measuring blocks to test tomorrow. I have a doubt about the o2 sensors. For the moment if you can take a video of the variable intake change-over valve I talked about that would be great. Here is the ssp of this variable intake:
http://www.volkspage.net/technik/ssp/ssp/SSP_212.pdf


To test the change over valve mouvement you need to:
1. Put the camera or phone near the valve.
2. start recording
2. Start the car
3. Rev the engine past 1200 rpm.
4. See how the arm moves up and down.

It should stay up under 1100 rpm and get pulled down above 1100 rpm.
When driving it should go up after 4400 rpm i think. But a stationary test will tell if it's


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Click to expand...
 
#25 ·
Goood. Just remember.
- Under 1100 rpm no movement.
- between 1100 and 4000rpm the arm is pulled down
- above 4000 rpm the arm goes up.

You only need to test under and above 1100 rpm in a standstill position.
This part is also responsable for a rolling marbles noise you might hear if the bushings around the rod which is operated by the arm are worn.


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Discussion starter · #26 ·
Ow yes forget to mention it. Last weekend i changed the filter including the whole container. (what a job :frown2:) did not realise i had to open up both sides of the fuelpump covers because a hose from the filter went to the other side :nerd:

Did not want to open the fuel filter housing so that was the only other alternative. It all looked so easy on the youtube vids on how to open everything up but it was a hassle to disconnect all the wires and fuel hoses under the covers. Some would just not come undone. After allot of patience it all worked out.

took me way too long (around 3 hours) and it was raining so i had to do it inside a very tight garage. So i could not even work from the outside. Also did not have a change to make video's.


was a big help..

My filter was never changed so it was very dirty. (opened it up to check afterwards).

filter change did not fix my running lean issue :frown2: i still suspect the main pump. bright side is that i know how to get to that now. So im planning to do this next weekend if i get the fuelpump in time.
 
Discussion starter · #29 ·
i looked at this and thought.... how would i do this... do you have a link howto do this. i did a whole scan of the car allready is that enough? i have that in a log allready at home.

And here is the first list of measuring block:

By group:
Group 1 - Field 0 Group 39 - Field 0 Group 39 - Field 1 Group 39 - Field 2 Group 42 - Field 0 Group 42 - Field 2 Group 43 - Field 1 Group 44 - Field 1 Group 46 - Field 1 Group 46 - Field 2

Or by name in advanced measuring blocks.
Engine Speed
Mass Airflow
Bank 1 - Sensor Voltage
Bank 2 - Sensor Voltage
Bank 2 Sensor 1 - Heater Resistance
Bank 2 Sensor 2 - Heater Resistance
Bank 1 behind - CAT Temperature
Bank 2 behind - CAT Temperature

Thanks.
 
Discussion starter · #31 ·
TRespect said:
Goood. Just remember.
- Under 1100 rpm no movement. >>> when the car is cold its goes straight to that 1100 rpm right? should the arm go up again after the car is warmed up?

- between 1100 and 4000rpm the arm is pulled down
- above 4000 rpm the arm goes up.

You only need to test under and above 1100 rpm in a standstill position.
This part is also responsable for a rolling marbles noise you might hear if the bushings around the rod which is operated by the arm are worn.


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Click to expand...
ill do this today after work.
 
#32 ·
Yes. When rpm goes down to 780/800 after a minute or so, maybe less, the arm should be up. You rev the engine above 1100 it should be pulled down and then goes up when you release the throttle.


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#36 ·
Thanks for the file. Heading to google drive to get it and compare with mine.
I'll need another one when you fix your fuel trim issue :)
Funny thing is your fighting with lean and I'm fighting with rich. I suspect the one of previous owners didn't want to replace the primary pump and hacked the relays to work on the secondary pump only. Will check it this weekend.
 
Discussion starter · #37 ·
TRespect said:
Thanks for the file. Heading to google drive to get it and compare with mine.
I'll need another one when you fix your fuel trim issue :)
Funny thing is your fighting with lean and I'm fighting with rich. I suspect the one of previous owners didn't want to replace the primary pump and hacked the relays to work on the secondary pump only. Will check it this weekend.
Click to expand...

I have to say that the lean condition was not in play during this test. because i was running on low fuel so both fuel pumps were working at this time and fuel trims were fine. (around zero)
 
#38 ·
Ok good to know.
First thing I see is the voltage of the two oxygen sensors Bank 1 Sensor 1 - Sensor Voltage and Bank 2 Sensor 1 - Sensor Voltage. On mine they don't go above 0.6v whereas on yours they are always at + 1.5. I'm not sure your values are right. I've read the o2 sensors should fluctuate at 0.5v. I'll have to check this. Maybe my o2 sensors are bad and are triggering a false rich condition alert.

Here is my log.

https://log.malonetuning.com/chart/...MOKw53Dt8KkwrHDvx1xw4DCgCc8w6PCiMKXwoQQdiXCr8KubcKZw4XCuxHDhsKUPnZnwrvCqcKZAAAA

And here is yours :

https://log.malonetuning.com/chart/...j8EJsOlw6FHw5LDmMO/RBwww6AFwq84JsKEcBzDssOqw5rCllnCvMO7MMKmwrQDwr97YwHClwAAAA==
 
#39 ·
Top google link

An oxygen sensor will typically generate up to about 0.9 volts when the fuel mixture is rich and there is little unburned oxygen in the exhaust. When the mixture is lean, the sensor's output voltage will drop down to about 0.1 volts. When the air/fuel mixture is balanced or at the equilibrium point of about 14.7 to 1, the sensor will read around 0.45 volts.
 
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