GolfGTIforum.co.uk
Model specific boards => Golf mk7 => Topic started by: sjw on 28 December 2020, 15:31
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Hi guys, I've been noticing lately that under moderate to hard acceleration, my car is skipping. It feels almost like the wheels are spinning for a split second, but the traction control light doesn't come on. It's like the car does a little jolt every half a second or so. I haven't had the chance to test yet whether or not it continues as long as I accelerate.
I first noticed it after I had my car serviced. They came back and told me that there was light oil misting on the front shocks, and that my tyres were in need of replacing. I've since had the tyres replaced, and the issue is still present.
I am running a JB4, which I was running before the service, on map 2. I took it off for the service, and put it back on afterwards. I don't believe the issue happens on map 0 (JB4 doing nothing).
I appreciate that I need to do more testing, but I'm intrigued as to whether anyone here might have a preliminary idea as to what it could be.
I find it unusual that I noticed it after a service (second service, which I believe is a minor service?). Could the garage have done anything that would cause this? Different oil or something?
For a while, I thought the issue had disappeared, which made me think that maybe it was temperature related. As you can tell, I'm pretty clueless. I need to do more testing, and to try and get some logs from the JB4 of it happening to see if that helps.
Thanks in advance for any clues!
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Oh, my car has also had an MOT recently (last week, post service and new tyres) and it got a clean bill of health, just also pointed out the oil misting
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That sounds like classic tramping...
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Weather conditions combined with worn tyres then new not scrubbed in tyres? Take the remap away and it stops - don't think you can blame the oil change :smiley:
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Weather conditions combined with worn tyres then new not scrubbed in tyres? Take the remap away and it stops - don't think you can blame the oil change :smiley:
It MIGHT go away without the remap, I'm not sure. I wasn't aware that new tyres could also cause this issue so I'll see if it goes with time.
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Is there a certain amount of time the wheels have to spin for for the TV light to come on then?
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It's axel tramp not the wheels spinning. Traction control can't fix that.
Stiffer engine mounts fix it but you probably won't enjoy that much.
Try some throttle control instead, don't just dump it.
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It's axel tramp not the wheels spinning. Traction control can't fix that.
Stiffer engine mounts fix it but you probably won't enjoy that much.
Try some throttle control instead, don't just dump it.
I never said that I was "just dumping it" nor that the "traction control could fix it". I said the light didn't come on. If it's axle tramp and it was bad enough, the light would come on.
It could well just be the weather combined with tyres. It had just never happened before in this manner until literally the day after the service, which I thought was odd. I'd had wheel hop/axle tramp before, but it had always been WAY worse, like the front of the the car was going to fall apart. The regularity that this occurs with, like one skip every half second, made me think it could be something else. I didn't expect to get the same symptoms with brand new PS4Ss and near-illegally-worn P Zeors.
EDIT: Sorry, that reads unnecessarily prickly. I'll keep looking into it and come back if it gets worse or doesn't settle down with more miles on the tyres or warmer weather.
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What tyres have you fitted and what pressures are you running?
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My understanding is that axel tramp is not caused by loss of traction, ie wheel spin but quite the reverse. The tyres are not breaking loose but that the weak link is the engine mounts and you get harmonics there.
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“Wheel hop can be caused by a variety of things, from the wrong shocks to a better surface than the tire can handle or more power than the tire can handle, but the biggest thing that we really see is bushing deflection within the suspension system,”
I've also never had 'a bit' of axel tramp, it's always very clear that's what's happening. :D
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“Wheel hop can be caused by a variety of things, from the wrong shocks to a better surface than the tire can handle or more power than the tire can handle, but the biggest thing that we really see is bushing deflection within the suspension system,”
I've also never had 'a bit' of wheel hop, it's always very clear that's what's happening. :D
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When this came up I did a search and one site explains it quite well...
http://www.turbosport.co.uk/showthread.php?t=94748
The fourth post I think, I know this is for older racing cars especially rear wheel drive so I'm not sure what differences there are for front wheel drive cars.
I've looked on the last MK7.5 brochure and one of the standard fitting listed for the GTi PP and upwards is an 'Anti-tramp feature', on RWD cars I guess this would be an actual bar to counteract the twisting, not sure how this a applied to FWD cars.
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When this came up I did a search and one site explains it quite well...
http://www.turbosport.co.uk/showthread.php?t=94748
The fourth post I think, I know this is for older racing cars especially rear wheel drive so I'm not sure what differences there are for front wheel drive cars.
I've looked on the last MK7.5 brochure and one of the standard fitting listed for the GTi PP and upwards is an 'Anti-tramp feature', on RWD cars I guess this would be an actual bar to counteract the twisting, not sure how this a applied to FWD cars.
Way back at Good Friday 2013, I ordered my MK7 GTD. All performance models had a stated "anti tramp feature". Imagine my disappointment when I finally had my GTD in Sep 2013, shod with Bridgestones - it tramped like a bastard. They must've forgotten to fit or activate the anti-tramp feature on mine. :grin:
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Not had any tramping since I fitted the 034 Insert for the Dogbone five years ago.
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Yes the dog bone is the fix but.. Much nvh?
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Ditto, would love to try one but every other review or comment seems to involve people taking them out again, because the nvh has gone through the roof.
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I’ve got the 034 top and bottom mounts on my Dsg.
The nvh can be annoying at times pulling away at low revs and I hoped it would improve but never did.
But I don’t get any tramping now. It really made a difference with ps4’s.
I wish I could try the different dog leg mounts available to see which reduced nvh the best but would work out a bit expensive 😂
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I’ve got the 034 top and bottom mounts on my Dsg.
The nvh can be annoying at times pulling away at low revs and I hoped it would improve but never did.
But I don’t get any tramping now. It really made a difference with ps4’s.
I wish I could try the different dog leg mounts available to see which reduced nvh the best but would work out a bit expensive 😂
I've also got the 034 upper and lower mounts, except mine is a manual. There was an increase in NVH at first, but 12 months down the line I don't notice it any more and wouldn't be without them. :laugh:
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When do you notice the NVH increase guys? Is it just pulling off and reversing? Thanks.
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Yes the dog bone is the fix but.. Much nvh?
Nope, the wife didn't even notice. However I did put it in with the car level with weight on all wheels so nothing was sitting at the wrong angle as the first time I fitted it I just jacked up the front of the car and there was quite a bit.
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When do you notice the NVH increase guys? Is it just pulling off and reversing? Thanks.
I’d imagine my dsg is worse than a manual as I have no control over a clutch vs revs but the nvh is noticeable at say 1500rpm pulling away and at idle in drive.
It’s annoying some owners say it’s terrible and others say they don’t notice the nvh.
Seems luck
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When do you notice the NVH increase guys? Is it just pulling off and reversing? Thanks.
In a manual, I'd say I only notice it when crawling traffic in 2nd gear with the revs below 1k and I'm to lazy to drop it to 1st
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Its like anything we talk about on here - whether the clubby suspension is too harsh, whether DCC is needed with 19's (or at all) or if the car is too noisy.... its very much a perception thing.
I'd say if the tramping really drives you mad, have a go with the dog bone. Its not too expensive and you can easily reverse it if it makes your life even worse.
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Thanks guys, I think I'll give it a go then. :smiley:
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As a quick update, I've tried it today without the remap, and it was still very noticeable at <50% throttle. I'd guess about 40%. More investigation needed really.
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Clutch?
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Clutch?
It's DSG so I bloody hope not!
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Dsg never has clutch problems?
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Is that what I said?
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Ahhh ok :wink:, I was just thinking of why you might get a pause in acceleration, clutch slip could well do it.
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Ahhh ok :wink:, I was just thinking of why you might get a pause in acceleration, clutch slip could well do it.
I just hope it's not clutch because that would be expensive!! I'm not even sure the acceleration does pause that much. It might well still just be the weather and the tyres. I just can't shake the fact that it literally happened the day after the service, and shows the same symptoms with bald tyres or brand new ones (well, 2 or 3 hundred miles on them)
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Get it plugged into the proper diagnostics as,they can tell now much wear is on the clutch.
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Went out today for about half an hour. Most of the skipping seemed to happen between 30-60mph. Did drop off significantly, though not completely, once the oil had warmed up to around 90C.
Checked the tyres once I'd got back (and they'd cooled), and the front left was quite a lot lower than the front right, with the rears also needing some extra pressure. Apparently it's too much to ask for a tyre fitters to ensure they're pumped up properly. Lesson learnt.
I'll try again tomorrow with the tyres now pumped up, and give it another look. Hopefully we can have some dry weather as if it is the wet, recent weather has not been helping matters.
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Tried this morning with the tyres at the correct pressure, same results
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So today it finally happened... Cylinder 1 misfire
Have hardly been using the car due to lockdowns so never got around to taking it to a garage. Today, went for an overtake (not even aggressive, a very slow moving vehicle didn't necessitate that) and the car juddered quite a lot and the EPC light came on. Pulled over and scanned with OBDEleven. Below is the exported log
01 Engine
System description: 2.0l R4 TFSI
Software number: 5G0906259N
Software version: 0002
Hardware number: 06K907425J
Hardware version: H13
ODX name: EV_ECM20TFS0205G0906259N
ODX version: 002003
Long coding: 092500124464050B2000
Trouble codes:
P130A00 - Hide cylinder
static
P030100 - Cyl.1 Misfire Detected
static
Before I phone the garage on Monday, has anyone got any quick things I could look at myself, on a driveway, with minimal tools? Things that might have shaken loose etc? Remember, this issue arose originally just after a service, which may just be a coincidence, but I can't shake the feeling that it will be related somehow.
I would like to take my JB4 off (even though it's been in passthrough mode) and test again, but I'm unsure if I really want to drive the car that much. So my next question is: can I do any more harm by driving the car as normal? When I turned the car off and on again, the light was gone, and the car no longer in limp mode. I drove the 1.5 miles home under 2000 rpm, and it seemed ok.
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The first thing the garage will say is plugs (without even looking at it) and as that's a serviceable part, they'll not cover the cost. After that, I'd hazard a guess at coil pack.
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Oh, when I say garage, I mean a local independent, not a dealer. I'm out of warranty anyway
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Today I went out in my car and checked the live data in OBDEleven. I could see that cylinder 1 was misfiring. I swapped the coil packs 1 and 3 (3 was showing no misfires). Since then, no misfires! That can't have fixed the problem, right? Unless something had become unseated? I need to do more testing.
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Could be something as simple as a bad connection to the coil pack.