2012 GTI SE 130 studder and stall

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12vman

Member
Have a pair of these both of them have ~ 140 hours on them. One runs great, the other one studders and sometimes stalls when I suddenly let go of the throttle. If I gradually lower the throttle down to idle it will not studder.

Had it in the shop they were swapping known good parts over to the bad machine:
Intake manifold with all sensors
Throttle Position sensor
Coils
Fuel injectors
ECU

Still having the same issue.
The machine that has the issue, it burns a lot more fuel than the good machine.
Also it has much stronger presence of fuel vapor than the good machine.
No evidence of any fuel leak, just strong smell of fuel when removing the seat or opening the front storage compartment.

What else am I missing? Any chance the fuel pump is sending too much fuel?
There are no fault codes generated on this event.
I have a CanDoo, how can I use it to isolate the problem?
 
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Did you change plugs? Did you switch throttle bodies? There is a fuel pressure regulator so unlikely it's getting too much fuel but could be getting too little if the pressure drops intermittently. Did you run it with the gas cap off/loose?
 
Yes did do plugs and throttle body with no change. Is the fuel pressure regulator part of the fuel pump assembly or is it a separate component? I have not tried opening the fuel cap but will do that.
 
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