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Mysterious Power Loss
Posted: Thu Jun 12, 2008 10:04 pm
by PaulF
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.
Posted: Thu Jun 12, 2008 10:06 pm
by TopBear
Any codes from VAG-COM?
Posted: Fri Jun 13, 2008 11:22 am
by KenM
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
Posted: Mon Jun 16, 2008 10:33 pm
by PaulF
Its in the hands of QST now but I think even Kim is a bit perplexed.
Posted: Tue Jun 17, 2008 11:54 pm
by flashyg
What is the code??
Posted: Fri Jun 20, 2008 6:47 pm
by PaulF
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.
Posted: Mon Jun 30, 2008 4:26 pm
by Bahnstormer
Sounds similar to a problem mine had a year ago, turned out to be exhaust temp sensors.
Posted: Mon Jun 30, 2008 6:30 pm
by jimbo1234567
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
Posted: Tue Jul 01, 2008 8:30 pm
by PaulF
Unfortunately mine didn't respond by turning off and restarting. Turned out to be deteriorated cats.
Posted: Tue Jul 01, 2008 9:03 pm
by jimbo1234567
get some milltek catless downpipes, the cheapest option