GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: Krispy on 14 January 2009, 18:51
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Right, I have this problem with my 1.8T AUM.
I’ve had it plugged in to vag-com and no fault codes come up, I’ve also been to many mechanics out there including ‘vw specialists’ and ‘turbo specialists’ but no one seems to know what is wrong with my car.
I’m going to try explain this as well as I can because it is very hard to understand without driving it.
Basically, I can be driving along normally and the car will completely loose power, the only way power is back is if I let go of the accelerator and press it again.
It can also happen at any time, for example sometimes when im pulling away at the lights it will happen straight away, or if im driving normally, and when I put my foot down.
The other day it lost power again on the m25, so I thought id try something, I completely pressed the accelerator and nothing was happening, the revs would just slowly drop, I then dipped the clutch and left the accelerator fully pressed, the revs dropped to 1200rpm and just sat there until I let go of the accelerator and repressed it.
The thing is it doesn’t happen every time I drive the car, but when it does happen it gets really, really annoying, I don’t enjoy driving my car anymore.
Thanks for reading and any help will be greatly appreciated..
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Maybe intake valve or spark plug related? A common problem on polos is the butterfly intake valve getting clogged and the car stalling or losing power (this was on the 99 model though)
Im not sure what using a cleaner spray would do on your engine so lets see what other people say first!
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a common problem on the AUM is that the injector loom breaks down - might be worth having a look at that
also clean your throttle body as these can get clogged up - there's a how-to in the maintenance and info section :smiley:
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ill check the injector loom mate,
i have already cleaned out my throttle body, and this didnt help, to be honest it was quite clean..
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ill check the injector loom mate,
i have already cleaned out my throttle body, and this didnt help, to be honest it was quite clean..
could well be electrically related then
have you checked all your pipes for splits, cracks, leaks etc?
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apparantely jabbasport checked them, but didnt find anything.
It would be good to check them again, but the thing is it can happen at very low revs, before the turbo even kicks in??
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has anyone replaced or at least looked at the TPS?
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what a tps?
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throttle postion sensor
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I had my whole accelerator pedal replaced, cz some1 said it was that, but not luck... or is the throttle position sensor somewhere else??
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oh.. something i forgot to mention...
ive noticed that this happens sometimes, if i go over a bump or take a sudden turn also..
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tps is built into the throttle body
is this happening mostly when there's engine movement? as in enough to be yanking/trapping a dodgy earth?
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ye, it only happens when the engine is moving
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tbh if it was an earth issue it would kill more than throttle, dash/lights/servo/pas etc.. happened to me once at 60mph in the wet, exciting!
here's a list of earth points to check anyway.. its yank so some things might be reversed for RHD http://mit.edu/dennis/www/vw/grounds.html
check the injector loom too though
it could be either of those but my gut still says tps.. maybe you can find a cheap or damaged 2nd hand throttle body on ebay and pinch the tps off it (vw don't sell it separately iirc)
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alright mate ill give them a try, cheers for the advice~!!
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I have the same problem but its very intermittent. Took it to VW to check and they said it was the throttle sensor, funny they didn't find this when it was under warranty?? The throttle body I was quoted at £150. They said the cleaned the throttle housing and it was OK for a while. Looks like I'll be getting a new throttle body when I get paid. What made me laugh is that they said it would take 2 hours to fit and would cost £150 in labour.
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I have the same problem but its very intermittent. Took it to VW to check and they said it was the throttle sensor, funny they didn't find this when it was under warranty?? The throttle body I was quoted at £150. They said the cleaned the throttle housing and it was OK for a while. Looks like I'll be getting a new throttle body when I get paid. What made me laugh is that they said it would take 2 hours to fit and would cost £150 in labour.
Good old Capitol in Merthyr i take it mate? :rolleyes:
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The previous owner took it to a few dealers as the fault was intermittent but it should have been picked up. Capitol are good at finding the faults its just the cost of the repairs. You'd think they'd drop their prices because of the credit crunch. They must just be doing services at the mo.
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Bought a throttle body for £60 and put it on today hoping that it had cured the problem but 5mins after i left the garage it started its SH!T again.
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Had something similar on an old golf tdi mk4, turned out to be the previous owner had fit the wrong air filter (too big) which intermittantly caused the engine to lose power.
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I have an induction kit on mine, but even before that when i had the standard one on i still had the same problem.
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has the maf ever been changed? and with a genuine vw one? tbh i've lost track of what you've tried
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ive tried the coil packs, checked all hoses for leaks, unplugged the MAF and driven but nothing changed, changed the throttle pedal and sensor, and today changed the throttle body with no luck again.
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when you say nothing changed when you unplugged the maf.. you mean it carried on doing the crappy power loss thing? or it just ran as normal?
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i mean it carried on doing the crappy power loss thing
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a real head scratcher then.. i can't think of anything else that wouldn't throw up some kind of fault code
anything fuelling related should give at least some kind of error for mixture... couldn't hurt to try some injector cleaner i suppose :undecided:
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That's the thing its so hard to diagnose with no fault codes and being so intermittent.
I really lost heart in my car though, dont know what else to do, the easiest thing seems to sell it.
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I have been having a very similar problem with my 1.8T for about 2 years now (although mine would sometimes completely cut out, try loosing power steering and power assisted breaks at 80MPH, yikes!)
http://www.golfgtiforum.co.uk/index.php?topic=52613.0 (http://www.golfgtiforum.co.uk/index.php?topic=52613.0)
No fault codes, new MAF sensor and temp sensor fitted, various other theories persued; still no joy. My latest round of problems seem to be battery related but I don't know whether there is a link to the ongoing intermittent power loss issues.
http://www.golfgtiforum.co.uk/index.php?topic=106378.0 (http://www.golfgtiforum.co.uk/index.php?topic=106378.0)
I do recall noticing that my battery warning light would flash on while the car was having one of it's moments, have you niticed this?
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I have been having a very similar problem with my 1.8T for about 2 years now (although mine would sometimes completely cut out, try loosing power steering and power assisted breaks at 80MPH, yikes!)
http://www.golfgtiforum.co.uk/index.php?topic=52613.0 (http://www.golfgtiforum.co.uk/index.php?topic=52613.0)
No fault codes, new MAF sensor and temp sensor fitted, various other theories persued; still no joy. My latest round of problems seem to be battery related but I don't know whether there is a link to the ongoing intermittent power loss issues.
http://www.golfgtiforum.co.uk/index.php?topic=106378.0 (http://www.golfgtiforum.co.uk/index.php?topic=106378.0)
I do recall noticing that my battery warning light would flash on while the car was having one of it's moments, have you niticed this?
Earth strap fault? :undecided:
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I have been having a very similar problem with my 1.8T for about 2 years now (although mine would sometimes completely cut out, try loosing power steering and power assisted breaks at 80MPH, yikes!)
http://www.golfgtiforum.co.uk/index.php?topic=52613.0 (http://www.golfgtiforum.co.uk/index.php?topic=52613.0)
No fault codes, new MAF sensor and temp sensor fitted, various other theories persued; still no joy. My latest round of problems seem to be battery related but I don't know whether there is a link to the ongoing intermittent power loss issues.
http://www.golfgtiforum.co.uk/index.php?topic=106378.0 (http://www.golfgtiforum.co.uk/index.php?topic=106378.0)
I do recall noticing that my battery warning light would flash on while the car was having one of it's moments, have you niticed this?
I haven't actually left it that long to come to a stop so i wouldnt really know if it would cut out. Usually when it happens to me i just let go of the accelerator and press it again and all power is back.
As for the battery warning light, i dont get that coming up mate.
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I know this is a bit stupid, but it's not something silly like the arm on the accelerator pedal is it? So when you let go it catches again? :undecided:
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Is it drive by wire or drive by cable?
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It's drive by wire mate
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I believe that with Vag-Com you can log the TPS and the drive by wire to a graph this might point at a problem. It does sound like a problem with the link between pedal and throttle body. Not heard of it before but might be worth sticking a post on VW vortex as they have answered loads of questions that nobody could pin down :)
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Mine has no stored faults for this either. Did you buy a new throttle body. Could be the one you bought was Fooked. Think that why VW never believed the previous owner or she did'nt explain the problem properlly. They told me it was the sensor in the throttle housing. There was a post from Nick of R-Tech about turning the ingnition on and off while tapping the throttle to release the sensor.
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ye but how likely is it that both the throttle bodies i bought have the same problem? Also i wasnt prepared to pay £400 when i wasnt even sure it was that.
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So the throttle body was a used item and not new, thats what I'm trying to get at. Call VW, i was quoted £150 for the throttle body. As the fault is intermittent it could be the used item is the same. Could be worth having a chat to Nick at R-Tech for some advice.
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I have called vw mate and they quoted me £380
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I have called vw mate and they quoted me £380
For the throttle body? :shocked:
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yep :undecided:
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yep :undecided:
Fooking hell that aint cheap. :shocked:
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I had a simliar problem with an Evo turned out to be a loose conection into the ECU have a look at where the loom goes into the ECU? If conections loose it'll be a intermittent fault? :undecided:
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F@@king hell thats steep. I'll call my local dealers and check again..
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Called VW and quoted £350 was gobsmacked at the cost
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Hi mate sorry to hear about the prob's.
Don't know much about the DBW set up, is there a pedal sensor that could be replaced?
How often does it do it?
Hope you get it sorted soon!
Sam
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Hi mate sorry to hear about the prob's.
Don't know much about the DBW set up, is there a pedal sensor that could be replaced?
How often does it do it?
Hope you get it sorted soon!
Sam
yes mate there is also a pedal sensor but i have changed that too..
People over at vwvortex reckon it might be my MAP sensor or im getting a fault code on vagcom about a faulty brake switch, they think it could be one of the two.
Also it happens everytime i drive it... very frustrating!
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can you not record some logs as previously said on vag com and take it for a drive until it does it?
Also would the lambda sensor cause it? I think i remember hearing lambda failure doesn't show up as a fault sometimes but if you check the reading via vag com it will be 0 or something like that?
A few stab's in the dark really, sorry can't be much more help :nerd:
Sam
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Take some logs and post them up dude, you can log to a csv file iirc :) log as much as you can and we may be able to see something :)
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ill try mate, gonna have to find someone with vag-com though..
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ill try mate, gonna have to find someone with vag-com though..
PM Kalu over on ukmiv's - i think he's in London somewhere lol
he's a bit of a VAG COM guru :nerd:
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It's worth buying an ebay lead for your cause mate. I got mine for about £14 delivered. Just need a lapptop then and away you go.
Sam
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Don't you need to download any sort of program for the laptop mate?
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Usually comes on the disc from the ebay sellers tbh matey, not a great deal to buy from Ross tech though :)
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Usually comes on the disc from the ebay sellers tbh matey, not a great deal to buy from Ross tech though :)
the software is FREE to download from Ross Tech
the cost is in the license in the lead :nerd:
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Or buy it from VAGproducts.co.uk like I did. Can't do autoscan which is a pain though.
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i see, might have to buy one then.
isnt it hard to use though?
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Not at all mate. Pain to get working on Vista though but XP works fine.
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i see, might have to buy one then.
isnt it hard to use though?
if you can operate a mouse with a fair degree of accuracy then you'll have no problems
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just bought one for £13.99 off ebay..
Ill do some logs when i get it and let you guys know what happens..
In the meantime im going to replace a faulty brake switch that i have been getting a fault code for, over at vwvortex they think this may be a possible cause, fingers crossed.
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Umm..can you do logs on the demo?
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which demo?, did i just buy a demo?
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Well the doftware you'll download will be a demo.
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cheeky f@@kers, so i bet to buy the full version will be around £80?
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Yeah although you can scan different parts of your car with the demo fine :)
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PM'd you
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In the meantime im going to replace a faulty brake switch that i have been getting a fault code for
ahhh see you never told me about that! if the ECU senses that you're pressing the brake pedal, it'll cut the throttle.
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lol sorry topher, only came up the other day though. People have been saying that but i thought it was just the tdi's that had that feature?
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no all dbw engines are like that.. try tapping the brake pedal with your left foot while driving and see what happens :wink:
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tried wt u said topher but nothing happened..
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i know this is a very old post but im hoping you got to the bottom of this? i bought a new mk4 2.0 gti last week and it has this exact same issue i've cleaned the throttle body and the issue is completely random, sometimes it does it sometimes it doesn't...
i'm hoping you can tell me what you did to fix it so that i can fix mine without spending a lot of money especially as i cant afford to spend loads.
please email me :)