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Discussion Starter · #1 ·
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2015 VW Touareg Executive 42,000ish miles
Has had a misfire on start up since 40k. Took about 2 weeks then it threw a code on the 1-3-5 misfire.

Been at the dealer since May 9th.

First, Diagnosis was wrong grade Octane, Which took 5 seconds to prove I purchase 91/93 99% of the time since I throw the receipts in the glovebox.

Second, Diagnosis was spoiled fuel, I drive 600 miles a week so fuel should be rather fresh and I use Tier 1 fuels which the shop manager was not aware of and told me I bought substandard fuel. Dropped Fuel Tank and clean and replaced with VW control Fuel.

Picked truck up and it miss fired at pick up. I left it.

Third, Diagnosis was bad PCV Valve they replaced the assembly. Still Miss Fires

Fourth, Bad Coil was told they swapped 1 and 4 coil and issue did not travel

Fifth, They blamed rich environment on fouled spark plugs. I asked how a spark plug could cause a rich environment, but noted the truck dumped excessive fuel on start up to warm up catalytic converters. If its not driven it should have rich indicating spark plugs. Replaced the Plugs.

Sixth, they said there was evidence of water on airfilter which I asked what it looked like at the last oil change since it had not rained in the 3 weeks since the 40k service and I have not been near water. My Dealer does not look at the filters with each 10k service. Replaced The Filter

Seventh, the manually tried the vacuum actuator on the throttle body for 3 cold starts. Issue continued.

Eighth, The fuel is bad I pointed out it was still the control fuel from when they replaced the tank.

Ninth, They believe there is excessive carbon build up on the valves, and running camera in it to look at the valves.

I have asked if they reprogrammed the ECU was told no it was current and there can not be an error in the load since it patches they installed. They have not swapped O2 Sensors, They have not replaced knock sensors.

My thoughts since the misfire is isolated to 1-3-5 it would rule out bad fuel since it would misfire on all. I am sure its not the Crankshaft Position sensor since its isolated to one side. They shop said they had one other Touareg do this and the owner god tired and traded it on another truck never to be seen again.

Thoughts?
 

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Your dealer is putting you through hell, you think they would be more knowledgable about your problem.

Carbon build up is very common in the 2.0T engines like in my Passat which causes misfires when cold, would be rare for this to happen with the VR6 at 42K but the camera will tell you for certain what the upper intake looks like.
 

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Discussion Starter · #3 ·
This is my first VW and last. I normally put 200k on a car in 4-5 years and drive BMW's. I got this for 20% off sticker and 0% interest and they threw in the 100k warranty. I should have bought the X5. But this is the 2nd time since I owned it I have had 40+ repairs first was a leak in the sunroof. Took 5 weeks to have a new headliner built.
 

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Discussion Starter · #5 ·
Just got a note, no carbon, installing new head on the 1-3-5 bank
 

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Discussion Starter · #8 ·
Do you have VR6 gas engine?

Yes the 3.6 which I learned today is a single head. Lead time on the head is 21 days, then they send out for machine shop to assemble, then they will drop the motor and install and will want it for a week to make sure no misfires.

Dealer Est will take another 5-6 weeks.
 

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Great engine, crummy experience. Sorry to hear about this headache. Hopefully they find the problem because at this point I wouldn't blame you for ditching it (naturally would want it running to sell so you don't loose your shirt).
 

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Well, at least drive it to 100K, since you've got the warranty on it. :- /

Sorry to hear it needs such drastic service, but I never get tired of seeing engine drop photos like that!

Seems like a cam shaft is toasted, or something to do with the valve train, since it's only happening on 1 bank. And as usual, VW's approach is to replace the ENTIRE assembly! At least it's not on your dime....
 

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Discussion Starter · #12 ·
They are reusing cams.

Stopped by today to take a look at it. For some reason I can not post photos. There was lots of gunk. I will not own another VW/audi again. Coming from a Penske Own BMW dealer (10 years) and Range Rover Before service here blows.

The mechanic thinks it will not resolve the issue.

Cam is being reused.
 

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Discussion Starter · #13 ·
So, head has been installed and guess what still a misfire on 1-3-5 on start up. Been in the shop 70 days so far. VWNA does not have any suggestions. I am blue from saying reprogram ECM.
 

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How the hell did I miss this: had a sunroof leak.

Check all wiring and ECU as it is in the floor the water damaged the wiring loom and or ECU.

Should have caught that the first time.

Seriously, have them look into it and search on here (there are pictures even). This is a common problem, but mostly to older Tregs. Your symptoms even seem to match as all manner of hell and weird events happen when there is water intrusion.
 

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Discussion Starter · #15 ·
Well, the saga,is almost over. VWNA QTM told the dealer to stop work. They are getting their check book out and buying it back.
 

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Discussion Starter · #20 ·
I agree. That is crazy. I wonder why replacing the engine wasn't less $$ than buying it back? <shrug>

Must explain why I don't work at a repair shop....
:- p
The issue is a temp misfire is being recorded. Everyone from the Master Tech, Service Director, ETC all are calling for new ECU or re program it needs a minor tweak, but VWNA is not touching ECU issues at the moment or tweaking them.
 
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