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Model specific boards => Golf mk4 => Golf mk4 TDI => Topic started by: MikeyB30 on 29 November 2006, 08:04
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Hi, as a recent purchaser of a Golf TDI 150 I'd appreciate the opinions of you guys who have been driving them for much longer. Now I 'upgraded' from a Skoda Fabia VRS,which as you know has the 130 TDI engine.
now the performance in this was amazing, always on tap and never a disappointment :wink:
So I figured, a bit of extra oomph, whilst a heavier car, would equal more fun !
Only problem is it feels like it's holding back, you floor it, and whilst I'm not going to get overtaken by a Metro, it feels laboured and inconsistent.
I recently put some diesel redex into it, took it for a drive to Exeter (200 mile journey there and back), and it perked up for about a week, was much more responsive, but now it's settled back into its 'holding back' mode.
Any ideas, thoughts greatly appreciated as I'm already thinking of changing it for a V6 2.8 version !!
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I'd put money on it being your MAF. This regulates the air and fuel mixture and is prone to failing thus creating 'flat spots' witihn the rev range.
Also check for split / loose pipes.
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i've got a TDI 150 too, which i've had for coming upto 4 weeks now i was really pleased when i got mine (although had to change one of the intercooler pipes as that had blown) but then i've come from a 1.4 petrol so its a massive increase for me.
the only think i can say i've noticed so far is that because its got the bigger turbo on it doesn't really kick in untill about 1700 so if you're talking ingear acceleration then there is going to be a little bit of lag unless you change down.
like Rhyso says, take a look at the hoses that connect the turbo to the intercooler and back as thats what went on mine
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Thanks for the feedback. Just had a look around the engine and all of the visible pipes look in good nick and are well seated.
I did notice an oil leak when I looked at the pan at the bottom, and from looking at the service history, an oil leak was noted on the oil return pipe from the turbo, but I can't confirm whether it was done or not.
Could this be a contributing factor ?
I'm just trying to look at the cheap repair options first, as I seem to recall MAFs aren't a cheap option (I had a Seat Leon Cupra once that displayed similarly inconsistent behaviour, but sold it before I got it looked at)
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Money is on the MAF. But do double check all the boost pipes. Other option could be to get your injectors ultrasonically cleaned based on what you said in your first post. Try to find somone with a VAG COM and read any error codes. Does a MAF fault come up on VAGCOM anyone?
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It might be worth adding that I fitted a green cotton air filter a couple of weeks after getting it, and it made no difference to the performance at all !. Whereas in the past on other cars when I've replaced the standard fit one, you do at least notice some improvement
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ah you have to be careful with what filters you use as some can have an adverse effect on the MAF. Your new filter could have had a contributing factor I'm afraid :sad:
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Lose the filter and check out the MAF threads on this forum or on MK1Vs.net.
90% sure it's an air-flow prob. Had the same with my Bora Sport. There's a cleaning guide on MK1V and a common swap is for the Merc MAF? Straight swap for around 30 bucks and a good set of security bits I beleive? Could be wrong - plus there were people who had bad experiences with it? But as far as I'm aware it eliminates the common flat spots and allows for a much smother pull?
Anyone else used the Merc Maf?
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Thanks again for all the feedback, from looking around the forums some more I'm going to go down the replacement MAF route. For some reason I had a figure in my head of hundreds to replace, rather than under £100 for a bosch, which isn't too bad.
One last thing that seems to confirm the MAF issue is my MPG, I can't get better than 45 (overall from a tank) even on a good run, whereas the Skoda never went below 51 no matter how you treated it
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just out of interest how easy is it to change the MAF is it easy to get to etc
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Well, It's just taken me 5 minutes to take out the existing unit to get the Bosch part number, and I'm certainly no mechanic. But you need a special tool if you only want to take out the sensor itself, as opposed to sensor and housing. From reading other threads security torx are the requirement, but I'm guessing what I'll be ordering is the complete unit from looking at Euro Parts yesterday
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Mine was holding back through parts of the rev range last month and that turned out to be a coolant temp sensor
Also if your after a MAF they are only about £70 from VW
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Well, have changed by MAF sensor but....
Long story short - Managed to find the exact part number on Ebay, brand new(don't think it's Bosch, from Portland Group, had seen their name in other posts. Fair shout mind you, ordered Weds morning, arrived Thurs, and fitted this morning.
So my ongoing saga has left me with the following:
1000-1800 revs, really poor pick up and chronic turbo lag, even to the point you take your foot of the gas and it really wants to slow down rather than your usual sedate slow down. Put it this way, I don't feel comfortable pulling out of junction in a hurry !
1800-3000 - spot on, gives way more than before and is exactly what I wanted :smiley:
3000-4000 - feels like it's misfiring, as performance dips again in pretty much every gear !
I did swap out the green cotton with the standard, but it made it worse to put the green one back in.
I also checked the fitting and stuff but it all looked fine
Any help/thoughts appreciated as before...
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as i said earlier i've got a 150 too, i can only assume mines running alright but have only had it about 6 weeks and not had it checked out as everything seems ok.
i'll agree the below 1800 the pick up is poor, but it doesn't really slow down, i have no worries pulling out of a junction, if i need to i can quite easily pull out, i probably change to second quite quickly if i'm pulling out on something so will normally get the traction on in second.
the power does tend to fall off over 4000 but at this point you would normally of changed gears of the top of my head doing about 130 in 6th is still under 4000
i'm not sure if this is going to help or not. however i'll try keep an eye on my revs when i drive home to night and will post anything that i might think will help
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Well...having suffered no pull up a hill at 1300 revs, foot to the floor style, and misfiring when idling, I've removed the replacement and am picking up a matched part from VW on Friday
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VW part solved the issue, one from ebay must have been faulty
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nice one; glad its sorted :smiley:
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Glad to hear it's all fixed mate.
Not sure but my mpg has not gone much over 40 - 45 in fact it sticks between that when my Mrs drives it and she drives it sensibly unlike me :grin:.
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Just to point out the after market filters just don't cut it the airflow vs clean air is always a problem the problems occurs when people use a fresh K&N pannel and it still has alot of sticky oil on it to attract the dust and crap. What I found was that the oil sometimes flies off the pannel down the induction pipe right onto the MAF sensor making it heat up and burning out to a limp mode.
Never try and clean it with chemicals either, it tends to leave residue and can cause premature ejeculation failure. :grin: