Hi all I've been looking on a few owner club site but still can't solve my problem... I know you have probably herd this time and time again but it's worth a try basically I got another mk4 gti t but only to find out it's a arz with a agu head not a problem apparently... Basically since the day I got it it's been boggy/misfiring up to 3k revs in every gear I've changed maf sensor, spark plugs ,coil packs , n75 valve to a new s3 n75 the diverter valve to the tt one witch is apparently stronger the rear lambda new fuel filter oil and oil filter , got it plugged into vagcom and there is no fault codes on now and no lights on the dash but yet the problem is still ther and its over fuleing by the smell of it as well
I have just overcome this problem and it was down to a faulty PCV check valve and the pipes had split and perished
I already changed that it's also known as a diverter valve I have replaced with a new mk1 Audi TT one
Yes we ran the car on vagcom and its showing no error codes what they think the problem is . Is that I have a arz engine with a agu head and inlet manifold whitch is bigger and my car is set up to run arz so apparently a remap will sort it. Wether this is true or not so I'm going to have to revo and ask there opinion
I didn't see the ignition amplifier mentioned in your list of checked / changed ? Does vagcom show misfires in all cylinders ? Someone with the same engine locally to swap some parts over with to find the culprit might Well save you spending too much more of your hard earned pennies pal. Best of luck
Nope no misfires. I don't know anybody with a 1.8t so swapping a few bits isn't a option unfortunately the throttle body got cleaned and reset and still no change honestly about to give up on this car
I'm starting to wonder if the whole engine is agu how would I tell this would a agu engine running of a arz ecu cause this problem ?
1999 AGU engine cars later gave way to the ARZ engine, which was a ME7.5 controllled engine that ran less diagnostics and a narrow band B1 S1. It was a transitional MK4 engine before the AUM/AUQ engines in 2001.
So basically there shouldn't be a problem then ... The misfire/flat spot is getting worse it sometimes judders while its in it .. I put it on the ramp at work today and found it has a leak out the flexi part of the down pipe but u can only here while its in the air would this cause the problem and make it run rich ? Even the mechanic at work Says he's baffled to why it's doing this.. So I took it to the vw specialist down the road from where I work told them everything that we tried and all they said was they have no clue and to take it to a place that dose modified cars as it has a agu head .... So if anybody is in Hertfordshire that thinks they know the problem your more than welcome to come and try lol
worth changing the coilpacks anyway if the hiostory is unknown. my mate built himself an agu mk2 and it had no power when pushed, it just felt like a massive boost leak as soon as you got past 1/2 throttle. we spent all day fiddling about with various bits and bobs, diagnostics never came up with anything useful. the next day he bunged a set of coilpacks on it and problem solved!
It's had new coil packs on it even unplugged leads 1 by 1 and every time I unplugged one engine nite changed whitch means there ok I'm wondering if it could be ignition amp but trying to explain how it runs is hard u have to drive it to realise but there's nobody that lives near me to help solve it ... So basically just got to keep chucking money into it to see if I end up solving the problem
ok was worth a mention anyway. it was really strange on my mates mk2, was kinda like a rev limiter kicking in almost. worth doing the ignition amp if it has one, is the airbox all standard as the amp should be sat in the side attached to a beefy heatsink. if its had an induction kit the heatsink doesnt get so much airflow and can fail. people have strapped a pc fan to them, or dumped in the scuttle to try and get more cool air flow
Mine looks like it is bolted to the bottom of the wing it has a standard airbox but it is not connected to it what your mates mk2 had sounds different to what mine dose when you put your foot down from start to 3k u see it boost to 8psi but bogs /miss fires until it hits 3k then goes it's hard to explain that's y I said u have to be in the car to understand the car isn't modded it standard but want to sort this problem before I start mapping and upgrading things as revo said a map won't sort the problem and won't map with the problem in case it causes damage.
hi i had the same problem changed pcv hose then 2 weeks later the same problem found out there is a small rubber pipe under inlet manifold close to battery it will be that pipe mate hope this helps
Sounds like you've got a right problem 2 things you should be doing do a compression test on each cylinder and see what compression you have also check the timing doesn't have to be out by much to cause problems also if possible have it smoke tested they are massively common for vacuum leaks even when you think you've checked double check let me know how you get on interested
Also forgot to say if you have the standard airbox in the side closest to the bulkhead there should be box that has two connectors going into it unplug and plug back in to ensure they are properly connected that deals with Parts of your ignition system and does not always show up on the eml
