Hi car running poorly despite new turbo

 

1.9 PD BXE Octavia 2

 

Took attached log tonight at max.  accel. 

 

JPEG shows graph

 

Thinking it looks OK but not really sure what ideal should be like so would value your thoughts.

 

Recirc. duty cycle has got me confused though - I get it that it should be high during max. accel. It was high - totally constant at 95.5% but I would have thought it should have been 100%. Again your thoughts and experience appreciated.

 

Could this cause poor running?

 

Have just bought (Legit) HEX + CAN VCDS so I am new to all this

 

Thanks

LOG-01-003-xxx-xxx graph.csv

Edited 10 April, 201610 yr by Octy0GG

"Hi car running poorly despite new turbo"

 

Can you describe how it's running poorly?

Hi car running poorly despite new turbo

 

Down on power - only really obvious once fully warmed up.

 

Most apparent over 2000 rpm, at which point power delivery is not smooth - very jerky.

 

A bit more of a smokey diesel smell than it used to have.

 

MPG has dropped by about 10 mpg

 

This car does not have a DPF - never did.

 

It has been converted to SMF.

 

Has had a reconditioned turbo - prior to this was even worse.

 

EGR valve cleaned, new MAF sensor, new fuel filter.

 

It all started to go wrong after a service and cam belt change - may or may not be related.

 

Torsion value is 0.5 degrees so cam timing appears to be OK.

 

Have attached boost plot here.

 

Any thoughts?

Thank you

Edited 11 April, 201610 yr by Octy0GG

If it happened after a cam belt change then actually checking the timing rather than using torsion value would be the best bet.

If it happened after a cam belt change then actually checking the timing rather than using torsion value would be the best bet.

Thanks - had wondered about this.

 

Understood that the torsion value should be an indication of cam timing relative to crank timing, measured in degrees of crank rotation. But had wondered if something like faulty or disturbed sensors could lead to a misleading torsion value. The odd one is that there is a TDC notch on the serpantine pulley which would suggest that timing is well out. 

On the bxe engine the lower pulley mark might not line up exactly with the notch but the only real way of checking is with the correct pins.