Engine Code 2341 and asking for help. Urs4 AAN

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Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Mon Mar 18, 2019 8:41 pm

Gents, I'm starting to lose my mind and I'm at my wits end lol...kinda

Finished my k24 7400 build and after switching to EFI ECU from VEMS I began to have issues. I was struggling to tune in VEMS and decided to go motronic for ease of play.

Installed my new motronic ecu and drove the car to work...on the very first WOT pull the car just fell flat on its face and began to buck and misfire like crazy. It got so bad the car stalled out and I was stuck on a bridge lol. Scanned for codes and got 4412. Had it towed home and as soon as it got home the car started just fine and no codes.

Started the car later that night and let it idle and once warm it started to throw a 4411 code and a 2341 code.

I tested every component possiable under the hood. Injectors all check out good. The output test Is good. Maf is working ( car dies when it unhooked) no boost leaks. No vac leaks. FPR is not leaking into the vac hose.

I've swapped coils to new ones on cyl 1 and 2 and no change. Installed new NGK plugs gapped to .20 .

Car is tossing black sut out the tail pipe at idle. I've not driven it since it was towed.. I cant afford another tow lol.

The 02 sensor is the only thing I've not tested...and will soon. I took it out and it was dirty. But I've seen worse.

Does anyone have any idea on what it could be causing this bucking and missing and stalling with the 2341 code the 2341 code is the ONLY code showing now the 4421 and 4411 code are no longer present.

Thanks to everyone....really hoping to have the car out this summer.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby ChrisAudi80 » Tue Mar 19, 2019 5:14 am

Sounds like boost cut, Kenny. It could be overboosting. If the Motronic still has the stock 2.5bar MAP sensor, it can hit boost cut easily.
One thing you can check is if the crank case breather hoses are all connected. I had a similar issue years ago after installing a catch can. I did not clamp the hose out of the crank case so it blew off. Was doing my head in for a year. Not easy to spot.

Dig deep.
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby Lucky » Tue Mar 19, 2019 9:21 am

4412 and 4411 are codes for your injectors. What ones do you currently have in the car and is the motronic tune configured for them, proper impedance etc.

Past that I'd check for boost leaks. Now that you are back on a maf tune any air leaks will cause you big headaches.

Also if you get stuck with a boost leak you can unplug the maf and limp it home but you need to feather the throttle to keep it running.

While the o2 sensor will try to adjust the fuel it will not cause you to die and not be able to restart. You could unplug it and it will keep running with no big issues aside from fuel trims.


Did you revert the crossed wires etc from the vems setup.

Edit: do you have a boost guage to see where it cuts out and what your idle vacuum is.
Double check your grounds too.

Keep us updated Kenny.
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Tue Mar 19, 2019 11:23 pm

So found a couple things tonight when poking around. Confirmed that yes I put the crank pins back to stock location after switching back to Motronic feom VEMs. However the black wire in the G4 connector is pinched, shielding is cracked and the exposed wire is corroded. Its really crusty and feels like it could be broke inside. I put the O2 sensor back in tonight but it's to late to fire up the car.

I decided to swap the G62 coolant temp sensor tonight, the one that was in had high resistance at 3700ohm before I pulled it. Replaced with a spare from my bench. One thing I note was the connector for the CPS had coolant inside it and on the pins. I'm thinking this was from when I pulled the head and coolant spills out. Took the connector apart and cleaned it. Wires look good but I'd assume a wet connector is not good lol.

Tomorrow I'll try and idle it up and see what happens. Also need to get a new pin for the connector on the G4.

After this it's back to the drawing board...and I'm a shitty artist.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Tue Mar 19, 2019 11:29 pm

ChrisAudi80 wrote:Sounds like boost cut, Kenny. It could be overboosting. If the Motronic still has the stock 2.5bar MAP sensor, it can hit boost cut easily.
One thing you can check is if the crank case breather hoses are all connected. I had a similar issue years ago after installing a catch can. I did not clamp the hose out of the crank case so it blew off. Was doing my head in for a year. Not easy to spot.

Dig deep.


Chris,

The ecu is on a 3 bar tuned by efi for my setup...the car did spike high (28) but Marc told me the the ecu is set to hit 28 on overboost and request 25 psi.

Few more things to check...but I'm racking
My brain...after this stuff above, the only thing I can think of would be the fuel pump. I am on the stock FP still with the k24 7400 setup. And my pump is 303k km old lol...so maybe it was just that one pull and it turned my pump into a dying pump? Stock pump is susposed to be ok to this power level no?
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby themagellan » Thu Mar 21, 2019 2:06 am

I suggest running wg pressure until you figure out the issues and try to stay out of boost :)

I *think* I know what your issue is - I've even seen it happen in person! :P

Read this - https://www.motorgeek.com/viewtopic.php?f=10&t=31440

s64 breaker under the passenger side carpet. The breaker is rated for 15a, so I put a 15a fuse in place of it. It appears that it supplies +12v to the coils, and maybe some other things under the hood.


Basically what causes the rage is this - When the breaker overheats it cuts 12v power, however once things cool down the breaker is able to give +12v again - so this just happens over and over until you replace every part on the car with no success.

So just try to Replace it with a 15amp fuse

Other thoughts if not:

Replace the 02 sensor (Why not put in a new one with such a new fancy setup anyway?)

Is the ECU Boost reference line hooked up?

If you keep getting those CEL codes for the injectors - trace the wires back to the ecu and then make sure the pins are in the correct place - Also make sure you reconnect the injectors.

Does it run OK on vems?

Edit - If you are running a stock FP pump I sincerely hope it is at least relayed - you can get an 040(Stock 10v CIS Pump) for really cheap that drops in the stock basket that will put you way over that ceiling
Last edited by themagellan on Thu Mar 21, 2019 2:16 am, edited 2 times in total.
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby ChrisAudi80 » Thu Mar 21, 2019 2:15 am

Asking Kenny to stay out of boost is futile. :D

I tried. Many times.
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby themagellan » Thu Mar 21, 2019 2:16 am

*try* :D
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Thu Mar 21, 2019 8:31 am

ChrisAudi80 wrote:Asking Kenny to stay out of boost is futile. :D

I tried. Many times.


I've not even drive the car since I've been towed lol. I've been testing the electrical components and came up dry everything is in spec.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Thu Mar 21, 2019 8:39 am

themagellan wrote:I suggest running wg pressure until you figure out the issues and try to stay out of boost :)

I *think* I know what your issue is - I've even seen it happen in person! :P

Read this - https://www.motorgeek.com/viewtopic.php?f=10&t=31440

s64 breaker under the passenger side carpet. The breaker is rated for 15a, so I put a 15a fuse in place of it. It appears that it supplies +12v to the coils, and maybe some other things under the hood.


Basically what causes the rage is this - When the breaker overheats it cuts 12v power, however once things cool down the breaker is able to give +12v again - so this just happens over and over until you replace every part on the car with no success.

So just try to Replace it with a 15amp fuse

Other thoughts if not:

Replace the 02 sensor (Why not put in a new one with such a new fancy setup anyway?)

Is the ECU Boost reference line hooked up?

If you keep getting those CEL codes for the injectors - trace the wires back to the ecu and then make sure the pins are in the correct place - Also make sure you reconnect the injectors.

Does it run OK on vems?

Edit - If you are running a stock FP pump I sincerely hope it is at least relayed - you can get an 040(Stock 10v CIS Pump) for really cheap that drops in the stock basket that will put you way over that ceiling


I'll be going to spring pressure next time I take it out until I can nail this down. My stock pump is relayed I checked the relay and its solid. The thermal breakers above the ECU have all been changed with the exception to the 12a one on the far left .

I'm going to be swapping the pump soon to at least rule that out. I'll look into the 040 as I would like something plug and play ish.

The car ran fine on vems, only issues i was having was figuring out the acceleration enrichment and idle tweaks. Car went lean under acceleration enrichment.

The car even drove fine on EFI. It was not until I hit alot ot boost on the first WOT pull that this happen.

Never been shis stumped before lol.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Mon Mar 25, 2019 12:54 pm

Went through the car again this morning. Found a few things relating to power.

At rest the battery is at 12.09v (seems low)
At idle it's at 14.2
Idle with all accessories on 13.2v ( code 2341 came back.)

If I blip the throttle the idle comes down to 400ish rpm and almost does then goes back to 850.

I'm thinking battery may be shot? Or at least weak. Maybe not providing enough juice to the pump. The pump is related.

I can get a fuel pump (Aeromotive 340) for $150
I can get a battery for the same...either way the wife will kill me lol. Going to see if anyone I know has a good battery I can use to test before.

Again, when running VEMS I had no issues of this nature. I literally just swapped ECUs and new injector Orings and drove away.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby themagellan » Tue Mar 26, 2019 5:50 pm

Voltages seem OK IMO

I think you're chasing your tail until you replace that 02 and check the injector wires.

Putting you on the right path - your battery doesn't do anything while the car is running, that is why you have an alternator.

Maybe check the connections on the battery (specifically the grounds)
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Tue Mar 26, 2019 7:18 pm

Injector wires are good, I've checked them. Power to injectors is good. The 02 is a suspect for sure, I've had them go out before and it ran rich but never the bucking and stalling that occurred.

I've got the rail off now and will be swapping in stock injectors and and a stock ecu to at the least confirm it's not the ecu.

I'm chasing for sure and I'm getting frustrated, just want to avoid tossing more money and parts into if it's something stupid and small.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Thu Mar 28, 2019 10:46 am

Found a possiable boost leak and do I ever feel stupid. The turbo outlet had to be modified to fit and was kind of a mess of plastic parts and hose clamps with some silicone bits. It looks like it may have separated enough to cause a headache. Not 100% yet but having a new outlet made today from aluminum so it should solve that. And hopfully that's her.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby PRY4SNO » Thu Mar 28, 2019 6:32 pm

For a b5s4 guy, boost leaks are bread and butter... just glad you found it before going too far down the rabbit hole needlessly shotgunning parts at random.

Tell me more about the custom aluminum outlet you're having made -- locally?
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Fri Mar 29, 2019 4:49 pm

Boost leak it was. Shes running now. Nice and strong.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby PRY4SNO » Sat Mar 30, 2019 3:01 pm

Vids or it didn't happen!
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Re: Engine Code 2341 and asking for help. Urs4 AAN

Postby morris400 » Sat Mar 30, 2019 9:55 pm

Not safe to video my car while driving. Lol. I will try soon though when I get time.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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