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15 GTI P0302, P0304, EPC, Flashing CEL

RPS99SHO

Ready to race!
Location
Frederick, MD
*sigh*

Car lost power and ran real rough just as the dash lit up on the highway. Pulled the codes while waiting for a tow. Probably a bad coil. Towed to dealer. My search here didn't turn up anyone else who has lost a coil. Has anyone experienced this? Seems to be a common problem in the mk6 crowd.

Mods: CTS intake, Bull-X catted DP. 25k miles.

The meat hook almost couldn't hook me because of the VWR springs. 1/16" lower and I woulda been waiting much longer for a flatbed.



 
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RPS99SHO

Ready to race!
Location
Frederick, MD
Verdict: bad injector. They asked if it was tuned, even though they couldn't find evidence in the ECU. Covered under warranty.
 
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GTIBEN

Ready to race!
Location
USA
Verdict: bad injector. They asked if it was tuned, even though they couldn't find evidence in the ECU. Covered under warranty.

But it makes me wonder if I shouldn't get rid of the NPM in case this happens again. Next time may not go so well.
I'd say get rid of the NPM and get the JB1 ;)
Just kidding. The NPM isn't seen by the ECU so you should be safe everytime assuming they don't see any physical evidence aftermarket hardware was installed. Keep it if you're happy with it imo.
 
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VWTURBOFAM

Ready to race!
Location
TEXAS
Verdict: bad injector. They asked if it was tuned, even though they couldn't find evidence in the ECU. Covered under warranty.

But it makes me wonder if I shouldn't get rid of the NPM in case this happens again. Next time may not go so well.

Glad it was covered bro. So, did you take your d/p and intake when you dropped it off at dealership? If you didn't, I'd say you're lucky then didn't get you for those parts.
 

RPS99SHO

Ready to race!
Location
Frederick, MD
I did not remove the hardware, only the NPM. What worries me is if I reinstall the module, and I kill another injector, they suspect something else is up then shift the blame to the other mods. Kinda stuck here.
 

GTIBEN

Ready to race!
Location
USA
I did not remove the hardware, only the NPM. What worries me is if I reinstall the module, and I kill another injector, they suspect something else is up then shift the blame to the other mods. Kinda stuck here.
I highly doubt the NPM had anything to do with the injector.
 

gn4rwhals

Go Kart Champion
Location
Detroit, MI
You really should get a piggyback that keeps fuel within stock ranges though instead of relying on the ECU to react.
 

RPS99SHO

Ready to race!
Location
Frederick, MD
You really should get a piggyback that keeps fuel within stock ranges though instead of relying on the ECU to react.

This has me scouring the webz looking for similar failures. With NPM, JB1, and full tunes.

I'm wondering if the stock injectors just aren't capable of sustaining 275+whp over a long period of time.
 

gn4rwhals

Go Kart Champion
Location
Detroit, MI
I've been seeing most failures of turbo etc. with APR and Eurodyne tunes but those are also the most popular.
 

RPS99SHO

Ready to race!
Location
Frederick, MD
Update: New injector, still misfiring. VW tech in Germany called to consult, new cylinder head being installed. Faulty intake valve seat. Not due to carbon buildup.
 

Shooter McGavin

Passed Driver's Ed
Location
Gulf Coast
You really should get a piggyback that keeps fuel within stock ranges though instead of relying on the ECU to react.

the jb1 doesn't fully control fuel either. it still relies on the stock fueling tables and wideband o2 for fueling and AFR. there are no AFR targets programmed in by the jb1

also, the jb1 does not adjust timing, which relies on the ecu to dynamically protect itself from pre-detonation by timing drops. typically, pushing boost up without backing off timing is a terrible idea, but new ECUs are so dynamic they can typically work around this. although, this is why pushing the limits on boost targets is a terrible idea.

same with the neuspeed module, although it is somewhat less sophisticated as it totally relies on the wideband o2 and computer to adjust for fueling based on the higher air volume coming through.
 

RPS99SHO

Ready to race!
Location
Frederick, MD
Final update. Car is back up and running, but not before some trial and error.

To recap: the original problem was a consistent misfire that left the car running on 3 cylinders. Pulled a whole bunch of P030X misfire codes. Towed to my local VW dealership. They found that cylinder 4 was the misbehaving cylinder after swapping coils and plugs around. They started by replacing injector 4. That didn't fix the problem. Next, the did a compression and leakdown test. They found 0 psi in cylinder 4 on compression, but it passed the leakdown. The reason it failed one test but not the other was because of the variable lift on the intake valves. While cranking, one of the intake valves on cylinder 4 was not sealing, but when the tech manually closed the valves for the leakdown, it passed. VW said to go ahead and replace the head. New head installed, still misfiring on cylinder 4. VW then gave authorization to replace the ECU. That finally fixed the issue. VW doesn't know why or how the ECU failed (again, I have never been flashed), but it did. Had my car been out of warranty, this repair would have cost $12,000 when labor and parts are tabulated.

 

gn4rwhals

Go Kart Champion
Location
Detroit, MI
Did you contact Neuspeed to ask about the possibility of the module frying the ECU?
 
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