boost lag and fuel economy question

[newsh]

That window where you're seeing those marks on the flywheel, is that down the left hand (UK passenger side of the engine bay) near the 2 flywheel sensors? I just want to be sure you're looking in the right place. (although I don't think there's anywhere else you can see the flywheel from..)

[hunker7]

That's the one yeah I will do they timing again when I get some free time

[hunker7]

Checked timing again following John's instructions and timing is right as far as I know. There are no errors either.

Open for suggestions on what else to check, and somewhere I could take her to get her running again near Leeds, but don't mind travelling for a good specialist. I know Automark isn't far, but he would be expensive probably?

[Rikki Kitto]

Spinks is over in Scarborough about 40 miles away good man who knows these cars well

[hunker7]

Spinks is over in Scarborough about 40 miles away good man who knows these cars well

Thanks, I'll drop him a PM and see what he says

[macspring]

I know Automark isn't far, but he would be expensive probably?

If Mark can sort your problem permanently, his invoice will be 'cheap', tbh.

[hunker7]

Did you mean to say "will be"?

[hunker7]

Looking at the plugs, it seems like car is running lean. So my question is, what sensors/things can cause lean running?

[newsh]

Fuel pump
Fuel Filter
Fuel Pressure reg
Lambda sensor
Leak in MAF hose, DV or PCV system meaning unmetered air is being drawn in between MAF and Turbo.

The ECU should correct for a lean condition if the Lambda is good, up to the point that it can't correct enough and then it should throw a code. So I would try changing the Lambda

[hunker7]

Thanks John.

FPR is unlikely, so is fuel pump (VDO). What would I expect to happen if I unplug lambda and it's not doing its job?

[newsh]

Dunno, try it

I think if you disconnect it the ECU will use a fixed value for lambda, maybe it will run better than with a broken lambda giving the wrong value? I'm really not sure.

[hunker7]

Dunno, try it

I think if you disconnect it the ECU will use a fixed value for lambda, maybe it will run better than with a broken lambda giving the wrong value? I'm really not sure.

I shall try it tomorrow, if it improves/doesn't change much then it must be lambda. I could see if local garage can check fuel pressure

[newsh]

Is it possible you have a leak in the small vac hose to the FPR? If so it will run rich on idle and lean on boost.

Have you done a full boost leak test since the rebuild?

[hunker7]

Is it possible you have a leak in the small vac hose to the FPR? If so it will run rich on idle and lean on boost.

Have you done a full boost leak test since the rebuild?

Checked that couple if times yes? Got a new clip and it's tight. I can't remember of I did tbh, I know that MAF hose where it goes onto turbo isn't in a great shape, it's all duck taped up.

[newsh]

Ok well you need to get that MAF hose sorted, no pressure there but there's some vacuum for sure.

Boost leak test is always first thing to do.