Gti High Fuel Consumption (10lt / 100km constant)

[necrogt4]

I'm currently running a fairly modded Polo 6R Gti with an APR stage 2, intercooler, exhaust, intake and R8 coils w/ NGK BKR7EIX plugs (the latest addition).

Since adding the coils my fuel economy has dropped to a long term average of 10lt per 100km which is constant, it doesn't go up or down, not even by 100ml. The short term average is 10-14lt-ish per 100km.


Logically one would think the coil packs are causing this but as it is a very common upgrade and the car actually runs smoother with them I'm not so sure. One other note of interest is the oil sensor is now throwing fault codes (implausible signal) and this started the day the coils went in. The wiring has been tested for the sensor and it's fine, so perhaps it's coincidence. Either way, it's getting replaced.


The fuel usage however is very strange. Has anyone experienced this?

[Sydneykid]

What AFR's?
Petrol (Pump 98 ) or ethanol (E85)?

Cheers
Gary

[necrogt4]

Not sure of the AFR's, high I'm guessing! I'll plug a scan tool and check it. Performance is actually better than what it was too smoother.

I run BP 98, so no change there.

[Sydneykid]

Not sure of the AFR's, high I'm guessing! I'll plug a scan tool and check it. Performance is actually better than what it was too smoother.
I run BP 98, so no change there.

For Pump 98 I wouldn't like to see anything much richer than 12 to 1 (around 0.82 lambda) other than cold start and run of course.
Using the additional performance isn't free, there is a cost in fuel consumption.

Cheers
Gary

[necrogt4]

Cool, I'll check that against my scan tool.

I've actually got a feeling that it's stuck in a permanent cold start (non-mapped?!) mode at the moment due to the faulty oil temperature signals.