17 hours ago, sushilovin said:

FRP may be acting in the way you describe if my assumption that Rob's readouts were taken in neutral is correct. The engine is under no load, so FRP only needs to increase with revs as the revs increase instantly with APP unlike when you increase the load when the vehicle is moving. Hope I've explained what I'm trying to say well enough.

I have done very few diagnostic tests with the car stationary. I know they will not be reliable indicators of what is really happening under load, and neither the fuel system nor turbo can be tested with any confidence in the results. No matter what the rpm is, in neutral there is very little power, and no need for much fuel or for any turbo boost. Also the rapidly changing rpm prevents any of the sensors or systems from settling to sensible values.

I was not 100% sure whether Rob's data was in neutral or driving slowly round the back roads, I suspect it is in neutral on the driveway, as you say.

It is quite easy and safe to use Forscan to log data while driving. Just make sure all equipment is secure enough not to need holding, and that any wires will not get in the way. Set it all up and start logging while parked, then drive as normal, only doing deliberate tests (power cycles etc) when safe to do so. Park up again to stop and save the log. I have done log runs of about 45mins like this. It takes a bit of navigating in the stored data to find interesting bits, but the pattern is usually quite easy to follow.

This is an odd problem, coming in after the 1st drop to idle. Whether it is a software type problem, or a mechanical problem with the turbo linkage, or another sensor or system (eg fuel) altogether is impossible to tell from the information so far.

I find it amazing that Ford did not fit turbo position sensors to some cars. The Mk2/2a 1.6TDCI is the main culprit. I think the Mk3 1.6TDCI (DV6c) and the Mk2/2a 2l cars have this essential component. Relying on the MAP sensor to try to position a complex vane or gate just using a pulsed solenoid valve on a vacuum is not something I would even contemplate trying to do! And I have worked on quite a few complex & dynamic control systems in my career. Its lack does make diagnosis even harder as well.

 

Hello again,

Turns out I'm not done. Just can't put the damn thing down, my own arrogance.

I've pulled out the turbo tonight. The car got really bad late last week, struggling to get up a small hill in second at 25. The ECU reckons it was making around 20 hp, based on fuel consumption. Decided that a car that didn't run but might run better in the future was better than having a car that barely ran.

The turbo itself looks in good nick, but I haven't opened it up yet. I can see no damage to the turbine or compressor through the housing. I hope to get inside it and have a look at the vanes before this weekend and I'll decide from there whether it will be a new turbo or not. 

I definitely do need a new EGR though, that thing is not working right at all lol. Should be able to fit it myself and retrain it in ForScan using the service procedure.

My car idles weirdly at idle quite often. The revs drop slightly, imperceptible by the vibrations, but you can see it clearly on the real time data readout. It happens in sync with the EGR actuation, up and down. Changes boost level slightly when it's warm too. Unfortunately my data recording app (just a mobile one, not ForScan) scales the graphs badly so you can't see it after that fact, but it's very evident in real time. My car is in no condition to be run at the moment though to get a screenshot, hahah.

I'll give an update on the condition of the turbo this weekend. Thinking about getting at the anti shudder valve while I'm in there.

How's it going with you Rob? Any update you can give us yet? Hope all is going well.

Cheers

Power steering going after limp  mode comes on, told it was alternator but still no difference. 

Does your model have EPAS or Hydraulic steering ?

Donna, this thread is 18 months old and you may get more replies from a new post. 
Without codes from the obd socket, it is a bit of guess work but there are a couple of common issues which can occur on Focuses of that era.

One is bad solder joints in the instrument cluster and corrosion / bad connections at the fuse box behind the glove box.

sometimes whacking the dash above the speedo can induce malfunctions if the cluster is a problem.

good luck