All Things Mk5 > How to Guides / Troubleshooting

Intermittent-pulsating power delivery ?

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GrayMK5GTI:
You need to do some proper logging with VCDS to find out exactly what's going wrong.

If the guy that mapped your car knows anything about the TFSI engine he should have logged the car afterwards to check the map wasn't asking too much of your components.

Tbh I can't believe you took a poorly car to get tuned  :popcornsoda:

mazza7282:
The map was done at R-tech as per reading/recommendations on this forum, the car only played up once after my high pressure fuel pump & follower was changed so then I just forgot about it didn't do again for many weeks until a short while after the stage 1 map.
As I said I had the DSG stage 1 map taken off as the gearbox didn't like it too much, although after similar reading on this forum my woes with the gearbox seem to be common place.

It's been plugged into VCDS, ODIS and I know the car has been driven around and logged as my Vag mechanic had the car for a week I got it back only just last week, and there wasn't anything untoward recorded.

Problem is the fault is so intermittent it happens like once or twice a month, which obviously makes it harder to diagnose  :scared:

GrayMK5GTI:
If it's intermittent then it's going to be difficult to trace. Does it do it when your low on fuel or any other conditions?

Logging with VCDS (not reading fault codes) is the way to do it.

Is everything tight on your HPFP?

mazza7282:
Yea all things tight on HPFP, no leaks or anything.
I think your right btw on the MAF sensor, car started doing same thing again yesterday (just as I was bloody pulling away aswell !) which in turn lead me to break down.
This time car would continually cut out, when you rev'd the car the rev's would increate very gradually/intermitent at a random rate. I decicded to unplug the MAF sensor and behold car hold's revs and I was able to drive it home, I would have thought the car would cut out aswell with no sensor plugged in but nope I was able to get it home.

I started to get worried as no engine management light appeared, although when I arrived home, restarted the car it came on and the engine was able to rev freely, when plugging MAF sensor back in again car would cut out.

So i'm going to obtain a new one, see here what engine was doing when MAF sensor plugged in and foot hard down on accelerator



A new OEM one from euro car parts is £126 or a 2nd hand one for £50 off ebay do you think ?

GrayMK5GTI:
Unplugging the MAF and finding the car works better confirms its the MAF.

Get a genuine brand new one, wouldn't waste your time with second hand one, could have same problem again.

Let us know if it's fixed once and for all then  :happy2:

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