vinny1275
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| posted on 24/3/10 at 08:24 AM |
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VW TDi sluggish acceleration - a reprise
Morning all,
continuing on from my thread last week, I've serviced the car - fresh oil, oil
filter, air filter and fuel filter - I've also replaced the MAF meter.
I thought it was sorted out this morning (only did the fuel filter last night), but by the time I was close to work, it's sticking again. Now
I've had a few hundred miles to learn how to drive it like this, this is what it's doing:
only using 25 - 50% throttle gives any acceleration - any more and it seems to bog down.
There's a flat spot from about 2400 - 2800 RPM, after this it picks up a bit.
I was wondering about the EGR valve - it's pretty oily on the outside, could it be getting stuck open and causing this kind of symptom? The
other possible causes I've thought of are: Throttle position sensor, fuel pump, or cam timing's gone off (don't think it'll be
the last one as it was better for 25 miles this morning).
Any other suggestions, or ideas on how to test for the above?
Cheers
Vince
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wilkingj
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| posted on 24/3/10 at 09:32 AM |
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I just sorted out my Sluggish Volvo 850 (Reduced MPG was the indicator, and just not going as well as it did).
The Front Brake Caliper was sticking.
Dont forget get to check the non-engine items as well. ie are all the wheels truning freely when jacked up and off the road?
Just a thought.
Hope you sort it soon.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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vinny1275
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| posted on 24/3/10 at 09:55 AM |
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Thanks Geoff. If it was a sticky brake, I think I would have set fire to it doing a 200-odd mile round trip at the weekend 
Pulling away is OK, so I'm pretty sure it's mixture / ECU related somehow... time will tell tho
Cheers
Vince
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turboben
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| posted on 24/3/10 at 12:51 PM |
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Vnt vanes get stuck on some tdis. If they stick closed you get overboost, restricted breathing and limp mode. Do a search on tdiclub.com
Ben
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James
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| posted on 24/3/10 at 02:07 PM |
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I'm sure you'd have spotted this but a few people here had trouble with one of the boost hoses popping off on VAG TDIs.
HTH,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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vinny1275
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| posted on 24/3/10 at 02:19 PM |
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quote:
Originally posted by James
I'm sure you'd have spotted this but a few people here had trouble with one of the boost hoses popping off on VAG TDIs.
HTH,
James
Had that last time  - went over all the connections I could find while over / under the car and couldn't find anything loose or
damaged-looking. Will have another check tho..
Thanks,
Vince
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iank
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| posted on 24/3/10 at 02:46 PM |
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I've read on here (I think) that they sometimes split which is hard to spot as they close up when there's no boost.
Worth a check.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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GeorgeM
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| posted on 24/3/10 at 07:20 PM |
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Hi Vinny,
EGR valve will cause this. Most manufacturers have the same problem.
Our Kangoo van does it regularly. I find that if you dip the cluch & rev
the engine it picks up ok. Slow up on the clutch & away it goes.
EGR due for another clean out soon 
Good luck
George
My conscience is clear - I drive a GREEN car
MNR Racing
essexkitcarclub.com
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rusty nuts
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| posted on 24/3/10 at 09:15 PM |
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As suggested clean the EGR valve, carb cleaner does the trick.
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vinny1275
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| posted on 25/3/10 at 10:42 AM |
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Thanks guys, that'll give me something to do after the GP on Sunday
George, did you see my u2u about le mans?
Cheers
Vince
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britishtrident
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| posted on 26/3/10 at 01:34 PM |
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Using the correct good quality fully synthetic oil and regular oil changes greatly reduces EGR related problems and will help avoid expensive turbo
issues.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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