All Things Mk5 > Mk5 General Area
Mk5 GTi stage 1 fuel pressure problems
Lassebongo:
Swapped to my old pump and the problem is identical. Yup 6.6 bar filter, from googling a bit and looking at new filters i saw that the filter has a regulator which also can fail so ill be swapping the filter next. I have been running the car for more than a year on stage 1 without any issues, the problem started right after i did a carbon clean and swapped out all the seals on the injectors. If the problem persists after filter swap the company that tuned my car will take it in and look at the map.
Cool good to know, haha nicely made tool!
ZoliWorks:
Well, if it started with a carbon clean and injector service, your best bet is to look there. You can long a few more things to get an idea of what's happening.
I think the misfire counter per cylinder and the lambda correction are the go to values here. Misfire counter will tell you if the car is experiencing any major misfires during load, which would prompt the ecu to reduce power by cutting fuel/air. Lambda control tells you how much the ECU is compensating for the correct air-fuel ratio. If it's positive, it's adding more fuel, so the car is running lean now and if it's negative, it's reducing fuel because the car is running rich. Another 2 values that are worth looking at is the lambda requested and actual. The ECU will try to maintain a specific lambda value (air fuel ratio) at all times but if the 2 values differ too much, there's a problem. I forgot the exact value but I think I'm running a 0.8 actual under WOT and as close to 1 as possible during idle.
Also check that all hoses and bolts have been tightened properly. I forgot to tighten the pressure release on my hpfp and while it was bubbling fuel out of it, the uprated pump internals were able to compensate. I ran the car like that for 3 days before someone mentioned how much it smells of fuel. I didnt even notice.. Honestly surprised it didnt catch fire cause of how hot these engines get
Edit: Get a MANN filter or a UFI. Dont go OEM because they are literally UFI filters with the OEM emblem on them instead..
Lassebongo:
Alright I'll check these values. It does misfire on cylinder 4 but nothing excessive under load, mostly on idle.
Now that you mention it, I did see a fault code for slow lambda a while back but didn't think much of it.
I did the injector reseal three times and triple checked the valves for debris that could have stuck in the openings but nothing.
Yup I've checked for leakage as well , couldn't find anything. The current filter is a Mann filter and I intend to buy the same brand yes.
The car does smell of fuel on cold start yes but only from the tailpipe fumes.
Lassebongo:
Ok so here is the update, swapped the filter and the car runs worse now. Im thinking its still something with the LPFP. It was a hassle getting it in, had to push pretty hard to get the locking ring on. im guessing the pump is pushed to far onto the bottom of the tank. The pump number is 1K0919051DB , according to a thread on this forum it should fit. Ordering a new seal in case its flattened to much and not sealing properly.
ATM the car only runs fine on idle but just a tad bit of throttle it stalls and shuts off.
Any ideas ?
ZoliWorks:
https://www.mk5golfgti.co.uk/forum/index.php/topic,134567.msg1165144.html#msg1165144
That was my pump thread. I went with a VDO pump as well but a different PN I think.
Check for error codes cause there must be something. I've ran out of ideas otherwise
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