Mysterious Power Loss

2.7 V6 30v biturbo - 380 bhp
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PaulF
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Mysterious Power Loss

Post by PaulF » Thu Jun 12, 2008 10:04 pm

Keep losing power down to I guess 250hp even though the engine runs smooth. Subsequently get engine warning light with fault suggesting defective MAF or air leak. Have tested for leaks, replaced MAF (twice), even changed the remap in case it was a degraded program. Problem still comes back. Any suggestions?

PS I am at Le Mans for a couple of days (in a bloody diesel A3), so won't respond to replies for a couple of days. Thanks for any help.
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TopBear
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Post by TopBear » Thu Jun 12, 2008 10:06 pm

Any codes from VAG-COM?
:blackrs4: B5 RS4, MRC Remap, Milltek, RS6\B7 Brakes, Black\Carbon
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KenM
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Post by KenM » Fri Jun 13, 2008 11:22 am

As far as I'm aware the MAF will not give a fault code even when reading low due to aging... possibly air leak?

Get vag-com plugged in and start logging tell tale blocks... MAF readings, boost pressures etc. Don't have block numbers off hand but as far as I call 003 and 115
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PaulF
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Post by PaulF » Mon Jun 16, 2008 10:33 pm

Its in the hands of QST now but I think even Kim is a bit perplexed.
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flashyg
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Post by flashyg » Tue Jun 17, 2008 11:54 pm

What is the code??
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PaulF
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Post by PaulF » Fri Jun 20, 2008 6:47 pm

Not sure of the numbers but apparently it is usually associated with defective MAF or an air leak. Checked all that including specialist kit for the air test. Next suggestion is deteriorated cats. F***ing car.
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Bahnstormer
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Post by Bahnstormer » Mon Jun 30, 2008 4:26 pm

Sounds similar to a problem mine had a year ago, turned out to be exhaust temp sensors.
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jimbo1234567
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Post by jimbo1234567 » Mon Jun 30, 2008 6:30 pm

me too the car would go great until around 4500 rpm then it would kick into limp mode until the engine was turned off then restarted, turned out it was a dead egt sensor killed off by a duff maf :thumbs:
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PaulF
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Post by PaulF » Tue Jul 01, 2008 8:30 pm

Unfortunately mine didn't respond by turning off and restarting. Turned out to be deteriorated cats.
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jimbo1234567
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Post by jimbo1234567 » Tue Jul 01, 2008 9:03 pm

get some milltek catless downpipes, the cheapest option
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