Weird missfire story

thelefth · Post by **thelefth** » Sat Apr 21, 2012 8:19 pm

Hello guys...

Two months ago i had a turbo failure and service told me to drive the car until they brought me a new turbo.
Shouldnt have accepted this though cause i think it was the beginning of all my problems.

After driving for two weeks only with the supercharger and all sorts of kicking and missfiring the turbo was repaired by the waterpump had already been damaged.

So now we go to the missfiring issue. I had the car for 2 weeks with a new turbo and a faulty water pump and had noticed some missfired and the lamp on the dash comimg on for about 20 seconds. Missfiring almost always occured at 4 to 5 rpm. Usually i could notice it on the 5th gear at same rev.

I now have my water pump fixed but missfiring occurs some times agaim with load and usually on fifth gear

Also they havent erased the waterpump fault codes when they were done.
Can this be the reason for the continuation of the missfires?

HELP!

1.4TSI 160 MANUAL

RW1 · Post by **RW1** » Sat Apr 21, 2012 8:24 pm

thelefth wrote:Also they havent erased the waterpump fault codes when they were done.
Can this be the reason for the continuation of the missfires?

Would not think so. Without knowing what they are, its hard to say. Please post the fault codes.

C.

mat · Post by **mat** » Sat Apr 21, 2012 9:23 pm

Sounds like coil packs, but.....

What happened to the turbo?? No metal left in the engine??

Codes will show what's in error, but I would get it into a dealers pronto!

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thelefth · Post by **thelefth** » Sat Apr 21, 2012 9:30 pm

You mean a metal from the turbo failure damaged the engine? Hope not!

Here are the fault codes:

Saturday,21,April,2012,13:19:49:60804
VCDS Version: Release 10.6.0
Data version: 20100630

Chassis Type: 1K0
Scan: 01 03 08 09 10 15 16 17 19 25 42 44 46 4F 52 55 56 77
VIN: WVWZZZ13ZAV******

01-Engine -- Status: Malfunction 0010
----------------------------------------------------------------------------

Address 01: Engine (CAV) Labels: None
Part No SW: 03C 906 027 BS HW: 03C 906 027 F
Component: MED17.5.5 G 1676
Revision: LAH07--- Serial number:
Coding: 0000072
Shop #: WSC 00020 294 86753
VCID: 73EE5A3A6BDD

3 Faults Found:

000768 - Random/Multiple Cylinder Misfire Detected
P0300 - 000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 3
Mileage: 59140 km
Time Indication: 0
Date: 2096.14.02
Time: 05:56:04

Freeze Frame:
RPM: 4654 /min
Load: 99.2 %
Speed: 145.0 km/h
Temperature: 87.0°C
Temperature: 27.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.097 V

000771 - Cylinder 3: Misfire Detected
P0303 - 000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 3
Mileage: 59140 km
Time Indication: 0
Date: 2096.14.02
Time: 05:56:04

Freeze Frame:
RPM: 4654 /min
Load: 99.2 %
Speed: 145.0 km/h
Temperature: 87.0°C
Temperature: 27.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.097 V

004267 - Magnetic Clutch for Supercharger: Excessive Wear

P10AB - 000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 1
Mileage: 58915 km
Time Indication: 0
Date: 2031.14.19
Time: 20:12:35

Freeze Frame:

RPM: 2669 /min
Load: 100.0 %
Speed: 40.0 km/h
Temperature: 46.0°C
Temperature: 19.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.351 V

Readiness: 0000 0000

RW1 · Post by **RW1** » Sat Apr 21, 2012 9:48 pm

Clear the faults down if they are prior to the previous repair and drive until it misfires again and see what re-appears. Looks like the Coil Pack on No.3 cylinder is faulty. Re-appearing again will confirm.

If you are able to swap them around, swap No.3 Coil Pack to No.4 position and likewise 4 to No.3. (Easiest alternative Coil Pack to extract as 1 & 2 and more difficult to get out). If it travels to No.4, its definitely the Coil Pack. If it stays at No.3, then you may be looking at a piston failure or a faulty injector. Taking out the plug may give more clues as an injector may show up as a "fuel washed clean" electrode.

C.

mat · Post by **mat** » Sat Apr 21, 2012 9:52 pm

Sounds like cylinder 3 isn't happy - could be coil pack (at best)....

Worrying why he supercharger clutch is showing excessive wear - could have been compensating for the failed turbo....

Might be worth clearing the faults if you haven't already, then seeing what comes back.

It might have gone into a sort of limp mode, but I doubt it!

Coil pack really springs to mind - you could try moving the coil on cyl 3 to another cylinder - if youngest a misfire on the new cylinder, then that's it!

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mat · Post by **mat** » Sat Apr 21, 2012 9:53 pm

Damn RW1 - you beat me to it!

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RW1 · Post by **RW1** » Sat Apr 21, 2012 9:54 pm

Two heads better than none

C.

mat · Post by **mat** » Sat Apr 21, 2012 9:55 pm

RW1 wrote:Two heads better than none

C.

Aye, but I've got my port head on!!!

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RW1 · Post by **RW1** » Sat Apr 21, 2012 10:00 pm

@thelefth

Its a 2009 1.4 160PS??
Did you have any misfires problems before 24s4 Engine ECU update was done? Engine ECU software update 24s4, probably done sometime around September 2010 - January 2011? (I notice the ECU is current with the latest VW ECU software.)

C.

thelefth · Post by **thelefth** » Sat Apr 21, 2012 10:24 pm

RW!:

I guess you are right.

But the latest missfire recording happened after the water pump repair.

Shall i erase it and wait for the next one?

Also i never had missfire before turbo replacement

mat:

I was running for 3 weeks with no turbo and water pump failed cause of that i think.

This fault wasnt erased after they repaired water pump.

Missfire recording though appear the day after i left the service.

Also RW1 missfires started after turbo fix but with a damaged water pump.

Hope i didnt get you guys confused.

Thanks a lot for your help.

RW1 · Post by **RW1** » Sat Apr 21, 2012 10:36 pm

thelefth wrote:Shall i erase it and wait for the next one?

RW1 wrote:Clear the faults down if they are prior to the previous repair and drive until it misfires again and see what re-appears. Looks like the Coil Pack on No.3 cylinder is faulty. Re-appearing again will confirm.

Yes, and see what re-appears. Then either dealers with new faults logged or do what I wrote above with coil swap and spark plug examination.

If there is damage to No.3 piston, only a borescope inspection will determine or the cylinder head off to look at the piston crowns and rear half of the cylinder wall for scoring.

Remember, fault codes are only a guide. With these misfires on the 1.4, a misfire may be recorded but the cause may be one of several possibilites. The last one I did was an injector poor spray pattern.

C.

thelefth · Post by **thelefth** » Sat Apr 21, 2012 10:59 pm

OK RW1 thanks a lot man.

Coil pack no3 is the third one starting left side looking at the engine right?

RW1 · Post by **RW1** » Sat Apr 21, 2012 11:02 pm

thelefth wrote:OK RW1 thanks a lot man.

Coil pack no3 is the third one starting left side looking at the engine right?

That does not sounds right or you've confused me with your lefts and rights ...... just to be sure, fuse box end by the gearbox is No.4. Windscreen washer bottle end is No.1.

C.

thelefth · Post by **thelefth** » Sat Apr 21, 2012 11:25 pm

Thanks

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