Club Touareg Forum banner
1 - 9 of 9 Posts

· Registered
Joined
·
20 Posts
Discussion Starter · #1 ·
progress is slow ,have tried to chase the problem using the search function just to find posts with no conclusion.
i have ross tech VCDS which a basic scan is near the limit of my current ability, I am struggling to put into use you tube directions on how to use it .
so i ask for some patience .
i have pulled the intakes off and removed carbon i cleaned intake ports as best as possible . removed EGR valves and fitted block off plates to exhaust manifolds . repaired the wiring on the fuel composition sensor ,replaced fuel filters , both batteries ,oil and filter for motor and trans.
ecu were sent of for repair this was needed as main ecu had can bus failure .i have inspected the cam on r/h bank and visually looks fine .
I replaced the injector loom in r/h side .and i have added a catch can running of the left pcv and have removed the right pcv . and have plugged the pcv inlet port in the intake to the turbo .

that covers work to date .
the touareg starts brilliantly and idles well . it is slow of the mark gets to 3000 rpm approx 80klm or 50mph and loses all acceleration and the revs drop to around 1500 rpm i can only just hold the speed and it starts to hunt /minor surging.
gearbox seems to shift well
I want to use VCDS to log fuel trims and check boost .i wil need help
i need to know flow rate n pressure specifications for the tank pumps so i can check it at the filter and how to run the electrical pumps through VCDS.
i will be chasing up and adapter to connect a pressure gauge to the HPFP to verify their out put.
thankyou for your help and support so far.
 

Attachments

· Registered
Joined
·
20 Posts
Discussion Starter · #3 ·
i really can see why so many posts are never resolved . i struggle to get my printer working ,emails give me grief . this is why i ask for help .

looks like i will go back to my non computerised 2006 landcruiser ute
and sell this stupid vw as a waste of time .
 

· Registered
2004 V8
Joined
·
399 Posts
I wish I knew more about V10 TDi drivability.
But comparing it to my V8, I can tell you when in-tank FP started acting up, it exhibited symptoms similar to what you described.
Also, I'd suggest checking MAF sensors.
In my case, G70 MAF was underperforming, not enough to set DTC, but causing a slight surge under certain throttle conditions.
Please check if you have ample fuel delivery, pressure, and volume. Then chase other issues related to turbocharger performance. Check CHRA for excessive axial and radial play. Is V10 turbocharger of VGT variety or single-type flow?
Is the wastegate linkage moving free?
Then the deal with EGR. I don't exactly how it works on VW, but on Ford/GM if you perform EGR block-off (Read horror stories about Ford 6.0L VT EGR cooler) you must recalibrate PCM to ignore the EGR function. If reprogramming isn't done, similar symptoms will ensue, On GM, with a botched EGR mod, you will also feel a lot more surge during exhaust regeneration mode.

Cheers...
 

· Registered
Joined
·
20 Posts
Discussion Starter · #6 ·
the o4 has no regen mode or any way to actually know their is no egr gear on the car its a fairly basic set up on the 04 .
i have reached out on multiple platforms for some real time specs ect and have found some will be doing some fuel pressure and flow checks.
 

· Registered
Joined
·
177 Posts
Have you run the output tests to verify the linkage is working correctly on the Turbos? Several years ago, I swapped the stock turbos out for larger compressor units. After about 3000 miles, the engine kept going into limp mode with the R/H Turbo causing the limp mode. I don't remember the exact codes or wording, but it was to the effect that the difference in boost between right and left sides was enough to throw a code and go into limp mode. If I shut the car off, turned it back on, and stomped the pedal to the floor, it would work just fine, as long as I kept the engine RPM high enough. Once the engine went back down to roughly 1500 RPM, it would throw the code and limp mode again. I ended up changing the turbos back to stock, and didn't have any issues. But a few years ago, someone in a post showed how to perform adaptation to the turbos using VCDS. I don't remember the thread title, I'll see if I can find it, but it's possible that you could run adaptation again, and possibly make them work. If I had known about running adaptation on my bigger turbos, I most certainly would have tried that, and I am still optimistic to this day that it would have solved my problem. I don't know if it will cure yours, but it may be worth a shot. However, you need to make sure that your actuators are working properly, and have complete range of motion.
 

· Registered
Joined
·
20 Posts
Discussion Starter · #8 ·
i have checked with vcds the movement of the actuators and it seemed fine ,but when i took for a run in the rain a few days ago it went alot better than it has been . im thinking water may have freed up the linkages more, so i will service the linkages with lube and run the tests again.
thankyou for help it is much appreciated
Rod Baker
 

· Registered
Joined
·
19 Posts
I know you are likely well past checking something so minor, but it may be helpful. I had the same symptoms. I replaced all the intake piping "o rings" and snap "rings". Low power, no acceleration above 40, never came back.
 
1 - 9 of 9 Posts
Top