JoeyEunos Posted May 21, 2016 Report Share Posted May 21, 2016 (edited) Right, where to start with this... Having now reached a dizzying 1000 miles in my new Lupo I'm getting to grips with it's niggles and minor faults, but there's one persistent issue that really irks me... When accelerating hard in 4th and 5th gear (Around 3K RPM or above and between 40-70mph) I tend to get a heavy pulsing/judder/vibration feeling through both the steering wheel and the pedals. Most of the time this isn't an issue as I poodle the car round at sub 2k engine speeds, but it's something I'd like to get to the bottom of none the less! So far I've had all four wheels balanced and also had the car's alignment set up with a hunter 4-wheel alignment machine. This was actually carried out by the chaps who work on my Mazda (As a bit of a favour because we're friends ) they're a sportscar specialist and I have the printouts and saw the wheel balancing happening so I know this was done properly! You guessed it, no improvement At this stage my thoughts have turned to engine/gearbox mounts or possibly a flywheel issue *Crosses fingers for not flywheel* My question is simple... 1. Does anyone have any thoughts/musings/advice as to where I should be looking and as to what this issue might be? 2. Is my car (SDI) fitted with a dual mass flywheel? I'm assuming the answer to this is yes on the basis there seem to be several 'Single Mass' conversion kits available online, like this...https://www.dmrclutch.co.uk/products/dmr6008-dual-mass-replacement-flywheel-clutch-kit-75.html and another...http://www.eurocarparts.com/solid-flywheel-conversion-kit It's also worth mentioning that despite finding multiple 'Solid Conversion' kits online if there is an original style 'Dual Mass' available I can't find it so I'm assuming this is a part I'd need to go to VW for? Thanks in advance for any help or advice chaps. FWIW the car's so old/cheap that I may well not bother chasing this down but my inner meddler means that I can't stop trying to think of ways to get round or explain this issue. Edited May 21, 2016 by JoeyEunos Quote Link to comment Share on other sites More sharing options...
rrdoctoruk Posted May 21, 2016 Report Share Posted May 21, 2016 your car does not have a dual mass flywheel, it could be the plate is out of line but i suspect not as it would of shown up before now or is that why the previous person sold it??/ it seems something it really out of balance,does it do it when you are standing still and hold the revs??? 1 Quote Link to comment Share on other sites More sharing options...
JoeyEunos Posted May 21, 2016 Author Report Share Posted May 21, 2016 (edited) @rrdoctoruk, Firstly, thanks for the response Re being a possible reason for the car being sold, that may well be the case, although TBH the circumstances that lead to this happening are so infrequent (Once or twice a week) that's it's not a huge problem, a niggle though none the less. RE there being no dual mass flywheel, I thought that was the case but the large numbers of 'Single Mass' conversion kits online for the SDI seemed to directly contradict that, weird eh? FWIW I can't recreate the symptoms i neutral or at standstill with the clutch in whilst holding high revs, does this rule out any suspicion of flywheel related issues? *Crosses fingers* As I say, this is probably something I'm going to have to learn to live with as one of those 'old car' quirks but I'd really love to get to the bottom of whatever's causing it. Having ruled out balancing/alignment the only things I could think of were either flywheel, engine/gearbox mounts, or finally perhsps a slightly bent or damaged drive shaft (It's worth mentioning that one of the wheels had a large-ish dent in it and a gauge out of the tyre indicating a misshap/impact of types, needless to say I've since replaced that wheel/tyre) Edited May 22, 2016 by JoeyEunos Quote Link to comment Share on other sites More sharing options...
carrera-gt Posted May 22, 2016 Report Share Posted May 22, 2016 Since it's only when you are driving there must be something else contributing, so uphill? down hill? Turn left or right? what else is going on when it happens. Engine mounts or driveshaft sounds favourite from what you're seeing or perhaps exhast touching under hard acceleration Take a passenger to see if it can felt through the body and not just steering and pedals. 1 Quote Link to comment Share on other sites More sharing options...
JoeyEunos Posted May 22, 2016 Author Report Share Posted May 22, 2016 ^Yep, it's something that only happens when the car's under load, heavy load at that, so hard revs in 4th and 5th gear ect, and yes, spirited uphill slogs are a good way of producing these symptoms. I'm pretty much convinced it's not the exhaust as it feels to me like a drivetrain thing, and FWIW it's seems to be imperceptible to passengers backing up this theory. The more I think about it the more likely it seems that it's either drive shaft or engine/gearbox mount related. The car often has a judder/clunk/shivver after turning off the engine so mounts seems possible. This is the caveat of sub £600 cars IMO, the very set of circumstances that pose the advantage of being able to walk away and leave a car if it goes wrong because of it's low vale, are the same set of circumstances that lead to a reluctance to spend time/money replacing things like driveshafts etc in search of an elussive solution Frankly, it's rare that I take the little diesel engine above 2500RPM, which means thankfully it's only something that I encounter once or twice a week. I'm starting to come to the decision that this is probably something I'm going to have to either live with or wait to get worse TBH. Quote Link to comment Share on other sites More sharing options...
Skezza Posted May 22, 2016 Report Share Posted May 22, 2016 Did you get round to that diesel purge? Quote Link to comment Share on other sites More sharing options...
JoeyEunos Posted May 22, 2016 Author Report Share Posted May 22, 2016 Not yet @Skezza, do you think it could help? TBH after valeting, treating rust, painting, fitting new tyres + alignment and completing a major service including topping up box oil all in the space of two weeks of having picked the car up (Inbetween my regular job) I'm feeling slightly burned out with it all So much for buying a cheap hack and not worrying about it TBF I always end up doing this, I tend to find it way easier to have affection for cheap/scrapper cars than I do new/expensive ones... Having now had over 1000 trouble free(ish) miles out of her I've really bonded with this little Lupo, my last tank of fuel returned 67MPG, any car that can do that I have tremendous respect for Quote Link to comment Share on other sites More sharing options...
rrdoctoruk Posted May 23, 2016 Report Share Posted May 23, 2016 from what you are saying i would go for the driveshaft,thats where i would start, you only need a small bend in it to produce quite alot of vibration Quote Link to comment Share on other sites More sharing options...
Skezza Posted May 24, 2016 Report Share Posted May 24, 2016 If it really is the driveshaft then I'd leave it. It's not worth it, unless it's really pissing you off. Wait till it gets worse then get it sorted. Not a massive job, but why spend any extra effort for something that you can get used to. I would be tempted to do the purge just in case it's an injector coking issue. Quote Link to comment Share on other sites More sharing options...
JoeyEunos Posted May 24, 2016 Author Report Share Posted May 24, 2016 ^ 100% agree with you Sir And yes, a pruge is very much on the 'to do' list. Quote Link to comment Share on other sites More sharing options...
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