Duncan Mould
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| posted on 25/1/10 at 01:43 PM |
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Tin top trouble, turbo diesel passat
I am sure that some one can help me on here, I have a passat 130 TDI and top end is a little sluggish. 0-60 is fine Turbo works ok and is pretty
rapid. After 60 it becomes lathargic, put a new belt on last weekend using VAG locking tools and fully locked it up. moved the vernier aboit 1 1/16 of
a turn and it made no difference. Took the turbo off this weekend and decarboned the vanes ( how sexy are they) and its made no differnce. Pointing to
overboost valve but it was replaced less than 5 months ago. Will it just want re setting?
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Madinventions
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| posted on 25/1/10 at 02:00 PM |
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A friend of mine had a similar problem on a 2002 Diesel Passat - the MAF sensor was the problem. £30 off eBay. 
Stick some diagnostics on it...
Ed.
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franky
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| posted on 25/1/10 at 02:21 PM |
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if its the boost dropping off, check the MAF sensor, then for cracked hoses.
If not the actuator arm on the turbo wears causing too much boost so the car goes into limp home mode(no turbo).
many a turbo are replaced with this fault but the turbo actuator arm can just be replaced instead.
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Agriv8
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| posted on 25/1/10 at 03:23 PM |
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I wopuld say MAF sensor if it goes slugish at the same RPM Band ( ie regardless of what gear ) ie slugish past 3000 rpm in all gears.
regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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dazzx10r
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| posted on 25/1/10 at 04:08 PM |
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As above, but also carefully check all of the hoses runing from the turbo to the intercooler, they split on the passat, causing loss of boost pressure
and can sometimes be mis-diagnosed as turbo failure. Easy way to check MAF is to unplug it whilst the engine is running, if there is no notable
difference with the engine running then the MAF is faulty.
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Danozeman
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| posted on 25/1/10 at 05:38 PM |
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Unplug the maf and try it. If its no different then deffinatley the maf. Theyr very common on them. Dont put a cheapy on it though it wont last 5
minutes. Get a bosch one from gsf.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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britishtrident
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| posted on 25/1/10 at 08:59 PM |
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Big cause of MAF failure is road spray entering the inlet, Rover 75 Diesels had big problems with this until they fitted a simply alloy deflector
plate in front of the air intake since then failures are rare.
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― From BBC TV/Amazon's Ripper Street.
[/I]
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