Engine seems powerless above 3k rpm

[colinpuk]

Hi My Lcr is behaving rather oddley, not missifireing the same as when i had a faulty coil pack its just driving asif i had the breaks stuck on also when it goes above 3000 rpm the engine starts to sound deeper and loosespower ive got a friend with vagcom but the standered diag is showing no faults

any ideas whats going on?

 

[JoeV]

Would VagCom show if the catalytic convertor is on its way out?

 

[colinpuk]

i have no idea, ive never used it before, i ran the test that tested all systems, the only error that came up was , low voltage but thats from a failed battery which i have recently replaced

 

[MrJohnnyB]

Have you cleared the codes and seen if the fault is still present? Are you running an induction kit or aftermarket air filters?

 

[traumapat]

try unplugging the maf and see if it improves. a dying maf wont show up on vagcom.
cat has before and after sensors so id have thought it would flag up if an issue

 

[matylad]

Have you tried logging with Vagcom?

Logging the MAF (block 003) and the Actual vs requested boost (block 115) should be a good starting point. Logging needs to be done on a flat straight road in 4th gear from low rpm right up to the red line. Plenty of info on this in the vagcom section.

Matt.

 

[colinpuk]

try unplugging the maf and see if it improves. a dying maf wont show up on vagcom.
cat has before and after sensors so id have thought it would flag up if an issue

What dose the MAF look like and where is it located? is it the sensor near the air box?

The car itsself is totaly standered no special air filters/ induction kits ect ect

 

[traumapat]

What dose the MAF look like and where is it located? is it the sensor near the air box?

The car itsself is totaly standered no special air filters/ induction kits ect ect

yes mate.
http://www.seatcupra.net/forums/showthread.php?t=101577&highlight=grease&page=4

post 66 shows a piccy although hes got an open cone. disconnect and drive but not far. youll have a dash light on. if it drives amazing the mafs proberly on its way out.

unplugging the maf makes the engine run rich so plug it back in once youve tested it as it could knacker your cat

 

[colinpuk]

ok i just had a quick drive around the block , it did make a diffrence , but only a mild amount, would that be because it is now over fueling?

also dose anyone know the part number and cost of a new maf sensor?

 

[traumapat]

ok i just had a quick drive around the block , it did make a diffrence , but only a mild amount, would that be because it is now over fueling?

also dose anyone know the part number and cost of a new maf sensor?

the ecu uses safe values if it gets no reading from the maf. so it maybe that the current maf is giving a bad signal hence improvement.
the black plastic tube that the maf sensor sits it should have a part number on it if i remember right.

you dont sound convienced its the problem..

if you get it logged with vagcom and record the maf whilst driving it should prove it.

air filter nice and clean?

 

[colinpuk]

just phoned seat is the maf also knowen as a thrust sensor?

 

[Damoegan]

No, the thrust sensor is prob the map sensor.