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Misfiring, running lean?

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2.8K views 25 replies 4 participants last post by  Hampton52  
#1 ·
Hi all, newbie tobith Touaregs and this forum. I had posted this earlier on VW Vortex, and someone suggested I bring it over here. Hopefully someone can help.
Context: I picked up a 2004 Touareg on the cheap at insurance auction to flip, fell in love with it, and have decided to keep it instead. Yes, I am well aware of the crapshoot nature of insurance auctions! This particular vehicle was a charity donation with a clean title, no collision, was not totaled or salvaged. I'm actually shocked I picked it up as cheap as I did!
Anyways, here's the post from vortex:
got home around 3am Sat night/Sunday morning, and my Treg was running fine; better than it had ever run, as a matter of fact. So I was completely floored when I started it Sunday evening, walked away to open gate, and it sputtered and died in me. Shocked, I tried again, staying behind the wheel to try giving it gas when it sputtered. Despite my best efforts, same thing.
I haven't run the codes w actual code reader yet. But my OBD2 tracker is telling me every cylinder is once again misfiring,
system running too lean. Which are problems I had thought (hoped?) we're solved w the new plugs and coils.
Praying this is something simple? I'm running out of money to throw at this car!! ANY help is greatly appreciated.
I do have videos of it dying on me, but I can't figure out how to make them small enough to fit here...
Thanks for reading.
 
#4 ·
I do have a proper
You need a proper tool like VCDS if you don't just want to throw random parts at it.
A generic reader will not give you sufficient diagnostic information.
Spend some of that money you saved by getting this so cheap on this much needed tool.
I do have a proper code reader; will update with codes when I have a chance to get them run.
 
#8 ·
Sorry!
2004, 6cyl, gas. No tow pkg or air suspension. 200k miles, purchased 2k miles ago lol. It came with no owners manual or service paperwork, so service history unknown. Engine is dusty but clean, no signs of any previous fluid leaks of any kind (agreed with by mechanic that looked it over for me). There were 3 applicable recalls, 2 have already been handled, the 3rd I was going to get fixed this week ... Only now it doesn't run.
I ran the codes just now, I did a verbal recording with transcript, attaching screen shots of the transcript. Ignore the last part where I'm yelling at my dog... 🤣
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#7 ·
Anything that takes the fuel from your tank and pushes it all the way up to your cylinder.
You could be out of fuel.
You could have crud in your tank and your fuel pickup has clogged up.
You could have a failed or failing fuel pump.
You could have old fuel.
You could have a fuel filter issue.
You could have injector issues.
You could have MAF sensor issues.
Without diagnostic codes we are just going to throw parts at it and you won't like the ROI.
 
#9 ·
Just attached results from code reader about 5 minutes ago. All I did was read the codes for the engine, if there is a different system or option I need to choose on the reader, and you have time to help me learn, let me know what it is I need to do and I'll do it. Still learning about cars in general, this car specifically, and the code reader as well.
I truly AM a newbie! Lol but I learn quick, and if I have it in writing, I only have to be told once. ...assuming I understand it the first time, that is! Lol. Thanks in advance for any help!
 
#12 ·
@WitchyMe
I realize that the way you posted your codes is easy and convenient for you, but I cannot spend this much effort trying to follow along to that. As such, I suggest that you post actual screen shots\text codes from your scanner\tool the way it presents it. There's a lot of useful information in there, and it makes a big difference when troubleshooting.

Some of your codes are too long, some have corrections..... why don't you try searching for error code
IMP dot CIRC dor no signal
and see what you come up with for hits. o_O

At the very least, spend some time and type out the exact codes so we can understand them properly. You have a pile of issues there, and you're just throwing parts at the problem with the hope that something will make it all go away.
 
#13 ·
@WitchyMe
I realize that the way you posted your codes is easy and convenient for you, but I cannot spend this much effort trying to follow along to that. As such, I suggest that you post actual screen shots\text codes from your scanner\tool the way it presents it. There's a lot of useful information in there, and it makes a big difference when troubleshooting.

Some of your codes are too long, some have corrections..... why don't you try searching for error code

and see what you come up with for hits. o_O

At the very least, spend some time and type out the exact codes so we can understand them properly. You have a pile of issues there, and you're just throwing parts at the problem with the hope that something will make it all go away.
Haven't thrown any parts at this particular issue yet. It needed plugs and coils badly; ran much better after they were replaced.
Until it stopped. Lol
After doing some research, and learning there are 2 fuel pumps, it seems to me the main pump must be out. Because it starts fine (aux pump), every time. Runs for about 30 seconds, then sputters and dies.
Like clockwork. Every single time. So common sense would say it is most likely dying when switching to the main pump after the aux pump starts it.
Or is there something I'm missing/misinterpreting?
How difficult is it to replace that main fuel pump?

Will also work on those codes, I know there are more issues than this one.

For context, Madi is an 80lb pit bull puppy that LOVES to play in the mud. Being as it is rainy season here, she has no shortage of mud to play in. She also likes jumping up in Mama's lap (I'm Mama) and in the car when full of mud. 😳 I, however, do not have the same fondness for being muddy, which puzzles her no end!! She is constantly trying to show me why I should love it as much as she does... 🤦🏼‍♀️🤷🏼‍♀️🤣
 
#14 ·
For the love of Maddie, listen to me!
You have major issues and without proper troubleshooting, you ARE throwing parts at it.

Right now, it's not starting.
Without any more specifics, your engine speed sensor is an issue... could be sensor, could be wiring, etc.

Here's a few headaches for you.... you're in over your head.... we can help you but only if you want to help us, help you.
I can also tell you to change all sorts of parts.... it won't cost me a thing, but I don't like that approach so I try to refrain from doing it.

 
#20 ·
For the love of Maddie, listen to me!
You have major issues and without proper troubleshooting, you ARE throwing parts at it.

Right now, it's not starting.
Without any more specifics, your engine speed sensor is an issue... could be sensor, could be wiring, etc.

Here's a few headaches for you.... you're in over your head.... we can help you but only if you want to help us, help you.
I can also tell you to change all sorts of parts.... it won't cost me a thing, but I don't like that approach so I try to refrain from doing it.

I likely am in over my head. But I learn how to swim fairly quickly!
And in this case, it's a labor of love; I had intended to flip this vehicle, but it snagged my heart so now it's mine. Luckily it's not my only vehicle! So I can take my time working on it.
 
#16 ·
Glad you made it over 🙋


That code reader is junk, need vagcom and rescan
 
#23 ·
You only need to worry about fault #1 at this point.
Almost all of the other misfire\lean codes are most likely caused by the ECU not being able to read the exhaust cam position and throwing all injection\ignition values off.
If you're lucky, it's a wiring issue or a flaky sensor. but at that age\milage, I'd be inclined to suspect chain stretch and nearing impending doom. Check your timing! (have it checked)
 
#25 ·