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Hesitant start/stalling at idle

socal87

Drag Race Newbie
2012 GTI, CBFA, APR Stage 2. 96k miles, valves were cleaned a couple months ago, recently cleaned air filter too. No issues with power or running during the entire time I've had the car.

Recently I've been driving less as I drive company vehicles at work, and my commute is only about 7 minutes. I am often out of town, and my car will sit for days at a time. I give her a bit of love on weekends; we only use my car on the weekends and I drive her like I miss her. She hasn't given me any trouble, though...

Until today.

Went to an appointment early in the morning, car ran fine. It stalled when I started after the appointment, which was weird, but it started right back up. Tank was empty so I went and refueled (Chevron, as I always do). Drove to work with no incident. Plenty of power, no hesitation, no issues.

Got back in my car after work to drive home, and it wouldn't start. Cranking, no fire. Finally started but immediately stalled; this happened a few times. Got it home and started troubleshooting. Pulled these codes:
Code:
Address 01: Engine Labels: 06J-907-115-CBF.clb
Control Module Part Number: 1K0 907 115 AT HW: 1K0 907 115 AK
Component and/or Version: 2.0l R4/4V TFSI 0040
Software Coding: 0403010818070160
Work Shop Code: WSC 04000 002 1048576
VCID: 78F5DAC40B00ED81D1-802C
3 Faults Found:

000768 - Random/Multiple Cylinder Misfire Detected 
P0300 - 000 - 
Freeze Frame:
Fault Status: 01100000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 154986 km
Time Indication: 0
Date: 2002.14.12
Time: 13:15:31

Freeze Frame:
RPM: 2318 /min
Load: 7.8 %
Speed: 0.0 km/h
Temperature: 91.0°C
Temperature: 36.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.208 V

000771 - Cylinder 3 
P0303 - 000 - Misfire Detected
Freeze Frame:
Fault Status: 01100000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 154986 km
Time Indication: 0
Date: 2002.14.12
Time: 13:15:31

000770 - Cylinder 2 
P0302 - 000 - Misfire Detected
Freeze Frame:
Fault Status: 01100000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 154986 km
Time Indication: 0
Date: 2002.14.12
Time: 13:15:31

Freeze Frame:
RPM: 2318 /min
Load: 7.8 %
Speed: 0.0 km/h
Temperature: 91.0°C
Temperature: 36.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.208 V


Readiness: 1110 1101

So.
- Car runs and drives fine as long as I keep it above idle.
- Idle is normal for the most part; smooth and regular. It can be seconds or minutes before it stalls, and when it does it is sudden as if the ignition was switched off.
- I pulled the plugs; they looked fairly normal except for a bit of carbon. No oily residue, no gas smell. I replaced them anyway.
- I'm running ECS red top coils. I've swapped them between cylinders; still getting misfires on 2 and 3.
- Power is normal as is throttle response. Car is driveable except for stalling while idling.
- The stall doesn't happen if throttle is applied, regardless of how much. I can hold it at 1000 RPM idle and it'll be fine.
- I can occasionally prevent it from stalling if I give it a little gas when it stalls.


As a side note, the cooling fans have been running constantly with the igniton on. The car can be cold and the engine not running, and the fans will ramp up to 100% for no reason, and stay on for a few minutes after the engine is turned off. If I have the AC running for a while the fans will cycle a few times before turning off. Here's the code:

Code:
001152 - Coolant Fan Control Circuit 1 
P0480 - 000 - Electrical Malfunction - Intermittent
Freeze Frame:
Fault Status: 10100000
Fault Priority: 0
Fault Frequency: 2
Reset counter: 255
Mileage: 154986 km
Time Indication: 0
Date: 2002.14.12
Time: 15:00:15
 

Uberryan

Banned
Carbon build up... maybe ECU or failing cooling fan?
 

socal87

Drag Race Newbie
Carbon build up... maybe ECU or failing cooling fan?
Engine runs fine; it isn't erratic or down on power. Intake valves were cleaned not very long ago.

Sometimes when it dies it won't restart. It'll crank and crank and crank with no fire.

I think this is an electronic issue.
 

Boscogn

Go Kart Champion
What about dirty fuel injectors? I want to say this sounds like a fuel problem. Change ur fuel filter too if you haven't done it in awhile i change mine when i change plugs. No gas smell in engine bay though? I would check fuel pumps for leaks but if you don't smell gas they probably good.

Sent from my HTC6545LVW using Tapatalk
 

MTBFL1

Ready to race!
If your car starts up after a few extra cranks, drops to ~500 rpm then dies with epc and check engine lights on the dash, it's a fuel pump. Happens when the tank gets run too empty often
 

Boscogn

Go Kart Champion
I didn't think about that. If it were a pump my guess is on the low pressure pump.

Sent from my HTC6545LVW using Tapatalk

Edit: take a look at this sounds like he had same issue.
http://www.golfmk6.com/forums/showthread.php?t=91078

In the comments it's mentioned you could have a vacuum leak which would cause the issue as well. Vacuum leaks and fuel issues are fairly common in most cars.
 
Last edited:

socal87

Drag Race Newbie
Wow, I'm an ass, never updated this. So it turned out the PCV had gone, and so had the engine speed sensor.

Then my timing jumped. Got lucky, no piston to valve contact. Jesus these cars can be scary sometimes.
 

bmanc42

Passed Driver's Ed
Wow, I'm an ass, never updated this. So it turned out the PCV had gone, and so had the engine speed sensor.

Then my timing jumped. Got lucky, no piston to valve contact. Jesus these cars can be scary sometimes.

I was going to say that sounds very similar to when my cam bridge screen blew out. Glad you got it sorted. These cars really do have their nuances
 
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