GolfGTIforum.co.uk
Model specific boards => Golf mk6 => Topic started by: Q451m on 01 June 2020, 19:03
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Hi All,
Thank you for accepting me to the forum, I have owned my 09 mk6 GTI since 2018. Abit of a back story, March 2020 the timing chain snapped on my car, the resolution was to purchase a rebuilt engine and fit. Since then I have barely driven the car due to the Covid-19 lockdown. However now I have started driving the car it has developed a fault with the car idling rough when hot and sometimes stalling when stopped and also hard starting when starting it 10/15 minutes after it has been driven. We have tried changing the coil packs however the issue persists. A scan using vagcom only shows p0172 system too rich bank 1.
Sorry if this has already been logged by someone else if so please point me in the right direction. If not I’d really appreciate your advise. Thanks in advance
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Possible Causes
Fuel system
Excessive fuel pressure
Leaking or contaminated fuel injectors
Leaking fuel pressure regulator
Low fuel pressure or running out of fuel
Vapor recovery system
Air leaks after the MAF
Vacuum leaks
Improper seated engine oil dipstick
Stuck EGR valve
Oil overfill
Cam timing
Cylinder compression
Exhaust leaks before or near HO2Ss.
If I had to guess from the most common I would say fuel injector sticking open.
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Thanks for the reply Snoopy, I’ve checked the fuel rail pressure on vagcom and that is well within the threshold, tried a new set of injectors, coil packs sparks, and the cam timing also changed the tensioner to be on the safe side. Will look at the other suggestions below too
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Hi All just a quick update, the issue is very intermittent. You think you’ve fixed it and then it comes right back at you, drove the car for 20 miles today and all was good, got to the end of the drive and it started to misfire again.
I have had a mechanic complete a compression test and the compression on all 4 cylinders is fine. I am currently trying to find someone in West Yorkshire who would be able to do a smoke test to look for leaks.
Are you also able to advice how the vapour system and low pressure fuel pump can be tested?
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Can’t it be something as simple as a spark plug
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It maybe, it’s very intermittent I plugged it in to the vagcom and got approx 50 misfires from cylinder 2 swapped coils around and that dropped down to 20 odd, I have ordered some coil packs from awesomegti and will change the spark plugs too
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Hi All,
Thank you for accepting me to the forum, I have owned my 09 mk6 GTI since 2018. Abit of a back story, March 2020 the timing chain snapped on my car, the resolution was to purchase a rebuilt engine and fit. Since then I have barely driven the car due to the Covid-19 lockdown. However now I have started driving the car it has developed a fault with the car idling rough when hot and sometimes stalling when stopped and also hard starting when starting it 10/15 minutes after it has been driven. We have tried changing the coil packs however the issue persists. A scan using vagcom only shows p0172 system too rich bank 1.
Sorry if this has already been logged by someone else if so please point me in the right direction. If not I’d really appreciate your advise. Thanks in advance
I thought you had already changed the coil packs?
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Hi, yes they were changed, however the ones used were from euro car parts so I was advised to change them again and get better quality ones
Hi All,
Thank you for accepting me to the forum, I have owned my 09 mk6 GTI since 2018. Abit of a back story, March 2020 the timing chain snapped on my car, the resolution was to purchase a rebuilt engine and fit. Since then I have barely driven the car due to the Covid-19 lockdown. However now I have started driving the car it has developed a fault with the car idling rough when hot and sometimes stalling when stopped and also hard starting when starting it 10/15 minutes after it has been driven. We have tried changing the coil packs however the issue persists. A scan using vagcom only shows p0172 system too rich bank 1.
Sorry if this has already been logged by someone else if so please point me in the right direction. If not I’d really appreciate your advise. Thanks in advance
I thought you had already changed the coil packs?
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Hi,
Quick update, I have changed the coil packs to the r8 style and that has solved the misfiring issue, however the car is still showing p0172 and occasionally idles abit rough. I have two questions,
Will I need to reset the fuel trim adaptations for it to adapt.
And secondly is anyone aware of a reputable garage I can take it to near West Yorkshire to investigate, a lot of indies seem to be fobbing it off because the fault is not pointing towards an exact fault and I don’t want to visit the stealers 😫
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The ruff idle to rule somethings out as just have a feeling.
What miles are on the replacement engine. There maybe excess carbon on the valves causing the misfire. Have you had it compression tested?
Do you have an oil leak between the gearbox and engine. Look under front of car and see if oily between gearbox and engine. Increased crankcase pressure that result in rear main fail can cause idle issues too.
If you ask on the main forum someone should be able to point you to a specialist in your area.
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Thank you, I had a look yesterday evening and can confirm there are no oil leaks present.
One thing i have noticed is that the temperature gauge shows 90c however when looking at the digital cluster it still shows about 50 degree's this then increases to about 110c and the engine gets rough after 100c. Is this normal for the temperature gauge?
Also since getting the 2nd set of coilpacks the p0172 system too rich has changed to an intermittent fault rather than constant.
Hopefully i am getting there and once again thank you for all your support
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Gauge is water temp
Digital is oil temp
did you do the spark plugs at the same time? Was one more sutted than the others?
Have you had it compression tested to see if its carbon build up on the valves causing the missfire?
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Gauge is water temp
Digital is oil temp
did you do the spark plugs at the same time? Was one more sutted than the others?
Have you had it compression tested to see if its carbon build up on the valves causing the missfire?
The Sparks were also done yes, The old ones were put in approx 500 miles ago, and were not greatly sutted, a compression test has been done and the results were fine.
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Hi guys, another update, We are finally making some progress! After cleaning the intake manifold the issue with the misfiring has resolved. However.... the car is still idling rough when warm, I have noticed this happens when the oil temp is 100-105c. I am thinking this maybe due to an air leak or a faulty sensor. I have also received an intermittent mechanical malfunction with the DV+ valve following the intake manifold clean so I am hoping it is just a air leak rather than one of the sensors. I have also tested the POV valve using the dipstick method and that seems to be good. I have finally got around to copying the logs of vagcom which are below.
Friday,10,July,2020,18:54:16:62939
VCDS Version: Release 12.12.0 (x64)
Address 01: Engine Labels:
Control Module Part Number:
Component and/or Version:
Software Coding:
Work Shop Code:
VCID: 55A167DFACF48DB6975
4 Faults Found:
000370 - Fuel Trim; Bank 1
P0172 - 000 - System Too Rich - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100000
Fault Priority: 0
Fault Frequency: 5
Reset counter: 255
Mileage: 135629 km
Time Indication: 0
Date: 2020.10.07
Time: 13:18:36
Freeze Frame:
RPM: 739 /min
Load: 17.6 %
Speed: 9.0 km/h
Temperature: 77.0°C
Temperature: 24.0°C
Absolute Pres.: 990.0 mbar
Voltage: 14.097 V
008759 - Oxygen (Lambda) Sensor B1 S1 (Decat)
P2237 - 000 - Pump Current Open Circuit - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 135642 km
Time Indication: 0
Date: 2020.10.07
Time: 17:48:06
Freeze Frame:
RPM: 1408 /min
Load: 10.6 %
Speed: 48.0 km/h
Temperature: 96.0°C
Temperature: 32.0°C
Absolute Pres.: 970.0 mbar
Voltage: 13.843 V
000370 - Fuel Trim; Bank 1
P0172 - 000 - System Too Rich
Freeze Frame:
Fault Status: 01100000
Fault Priority: 0
Fault Frequency: 3
Reset counter: 255
Mileage: 135656 km
Time Indication: 0
Date: 2020.10.07
Time: 18:15:15
Freeze Frame:
RPM: 763 /min
Load: 19.2 %
Speed: 0.0 km/h
Temperature: 93.0°C
Temperature: 36.0°C
Absolute Pres.: 990.0 mbar
Voltage: 13.716 V
008801 - Boost Pressure Control Valve (N249)
P2261 - 000 - Mechanical Malfunction - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 135659 km
Time Indication: 0
Date: 2020.10.07
Time: 18:21:41
Freeze Frame:
RPM: 1517 /min
Load: 9.8 %
Speed: 51.0 km/h
Temperature: 94.0°C
Temperature: 28.0°C
Absolute Pres.: 990.0 mbar
Voltage: 13.843 V
Readiness: N/A