poor MPG STILL... after changing so many parts

[jedi-knight83]

Ok. Just performed a basic setting. Will see if that changes anything

Also happy to report there were no new fault codes :)

I checked the fuel trims on block 32 aswell


I think that's a bit outside the recommended 10%?

Whose map are you running and with what intake?

R-Tech stage 1 and I'm on a stock intake.

[bacillus]

R-Tech stage 1 and I'm on a stock intake.

Hmm, I would contact Nick and ask him about those values.
Usually a poor aftermarket intake will give a high partial lambda but you shouldn't see this with a stock intake that has no leaks and with a good maf sensor.

Just an afterthought but when did you last change your air filter?

[jedi-knight83]

R-Tech stage 1 and I'm on a stock intake.

Hmm, I would contact Nick and ask him about those values.
Usually a poor aftermarket intake will give a high partial lambda but you shouldn't see this with a stock intake that has no leaks and with a good maf sensor.

Just an afterthought but when did you last change your air filter?

It was a new filter about 1 year ago. Its a pipercross panel.

when you say air leaks.. where should i be checking?

[bacillus]

It was a new filter about 1 year ago. Its a pipercross panel.

when you say air leaks.. where should i be checking?

With the oem setup you really only have two joints, one that attaches to the turbo inlet (secured with a clamp) and at its other end to the airbox that's held secure by 2 clips. It's unlikely that there would be a crack in the plastic connecting tubing but there is a rubber O ring that seals the joint at the air box side that could have dropped off or badly deformed leading to an air leak.

[jedi-knight83]

It was a new filter about 1 year ago. Its a pipercross panel.

when you say air leaks.. where should i be checking?

With the oem setup you really only have two joints, one that attaches to the turbo inlet (secured with a clamp) and at its other end to the airbox that's held secure by 2 clips. It's unlikely that there would be a crack in the plastic connecting tubing but there is a rubber O ring that seals the joint at the air box side that could have dropped off or badly deformed leading to an air leak.

I replaced this part recently due to a deformed O ring seal. So its brand new and both seals are also new

[bacillus]

In that case I'm out of ideas.. 

[56OctyVRS]

Have you tried fitting an oe paper panel filter or cleaning the filter?

[jedi-knight83]

Have you tried fitting an oe paper panel filter or cleaning the filter?

I'll give it a go tomorrow. Anyone know the cleaning process for a pipercross panel :)

[GrayMK5GTI]

Have you tried replacing the lambda sensor??

That can affect the MPG if it's playing up. You may not get a fault code from it either  - could have been damaged the sensor when removing the pre-cat?

Failing that, ring Nick 

[jedi-knight83]

Have you tried replacing the lambda sensor??

That can affect the MPG if it's playing up. You may not get a fault code from it either  - could have been damaged the sensor when removing the pre-cat?

Failing that, ring Nick 

No i've not tried that.

Nick suggested trying the MAF sensor. thing is I'm a bit poor at the moment and 'trying' all these sensors means buying new ones and the MAF is over £100 and goodness knows what the other one is... pretty pricey just to try them out?

[bacillus]

If you're out for a run, could you log block 031 for lambda and block 112 for median EGTand post what you get.
Am I right in thinking you removed your precat?

[GrayMK5GTI]

Turbo cars eh  

You don't get these problems with N/A engines  

I'm troubleshooting a misfire at idle, stuttering / surging under load, clicking front suspension, clunking rear suspension and now my clutch is about finished 

[vag12]

How do I do this logging with vcds? My car is running extremely low mpg and need to find out what the problem is, how do I log 32?

[bacillus]

How do I do this logging with vcds? My car is running extremely low mpg and need to find out what the problem is, how do I log 32?

If you have a vcds cable then turn the ignition on (you don't have to start the car )>click select>engine>measuring blocks, type in 032 in the first group box then press go button and the values will pop up like in Jedi's pic.

[jedi-knight83]

If you're out for a run, could you log block 031 for lambda and block 112 for median EGTand post what you get.
Am I right in thinking you removed your precat?

I'll have to have a go at this later in the week or next weekend. what kind of run should i log ? a quick A road blast?

Yes pre cat removed.