All Things Mk5 > How to Guides / Troubleshooting

Intermittent-pulsating power delivery ?

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mazza7282:
Evening all

Car = 2005 GTI 200 DSG

A few months ago I had my high pressure fuel pump replaced along with cam follower as I was getting sporadic power delivery, feeling jerky pulling away which in turn lead me to call out the AA as the car was undriveable, foot would be flat to the floor and i could barely climb above 4000rpm in any major hurry, reading here its a common fault anyway.

Problem seemed to go away for a few weeks but then it happened again after filling up, I thought OMG dodgy fuel but then problem went away for many weeks so I ignored it.
As I thought car was running hunky dory, I then took my car to get a stage 1 remap + DSG map, managed to get 236.6bhp and 306lb's ft which I was happy with, and along with the DSG box performing a lot better (all be it more jerky than usual) I carried along my way.

Then a few weeks after than the original problem I descibed earlier happened again, my vagcom displayed all sorts of error codes 04243 and 00665, along with 002-lower limit exceeded.
Problem was as I dont use the car regulary and the problem was so intermittent it was barely noticeable so I left it eventually I then returned it to my mechanic who then hooked it up to the laptop and performed an ODIS upgrade and was able to keep my stage 1 dsg map, I was advised that this was an update for the fuel pump and that the main ECU map would be bypassed.
I did however have the stage 1 DSG map removed, and put back to the latest map (also done with ODIS) as the gearbox was too jerky for my liking, around 50% faster but it wasnt smooth anymore.

The jerkyness/intermittent power delivery was most often than not felt when the car had just started up and I would give a decent amount of throttle, although since the update that problem has definately gone away.
Although today I went out in it, allowed the car to warm as I was driving before a more "spirited" drive was to commense and all was well until I came up to a set of traffic lights. Went to pull away and the original problem occured.

So i've had a new HP fuel pump, cam follower, ODIS update ....... despite my stage 1 engine map or not as the problem was there before I am unsure of how to proceed further, anyone out there that can help i'd be forever in your debt ! as this problem has been going on for almost 3 months now.

Thanks all :)

mazza7282:
Just to add, i plugged this into my cheap vag code reader off ebay today and i got no codes, took into my vag mechanic and hes got no codes either on ODIS.
Strange that it didnt even record a fault :(

mo:
Symptoms sound to me like your maf is faulty tbh. May be an idea to run some logs. Do you have a copy of the scan you did ?

mazza7282:
Hey

No I don't i'm afraid my cheapo code reader doesn't record logs only codes. Didn't think of that TBH.
I would have though if it was the MAF, it would be more prominent than non existent, driving it today hasn't done it once.

Definitely food for thought though

mo:
Had the same symptoms on 2 previous cars. Next time it bogs down try pumping the gas to see if it picks up any quicker than if you just left your foot down. Does it ever stall when coming to a stop ?

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