A

Ads1022

New Member
Hi all
I've got a 1999 Discovery Td5 10p Auto, recently it's developed a issue where it won't rev past 3K revs on full throttle, fault logged on Nanocom is Air circuit fault (logged low)
On Nanocom it shows a air flow of 4.3 with ignition on, start the vehicle and goes back to 0.0... So far I've replaced the Maf, the wiring loom, checked / replaced fuses, tried a different Ecu, boost modulator bypass, actuator & Turbo... vacuum hoses, running out of ideas, so hoping someone on here is a wizard and can possibly suggest other parts or things to try !
Many thanks
 
Ads1022 said:
Yes, checked & replaced to be safe
Click to expand...
Hopefully @sierrafery will have more ideas. but it sounds as if the ECM thinks you are overfuelling which can be caused by a problem with the turbo wastegate actuator.
But is seems you have thought of this and sorted all that out.
I am out of ideas but hope you get it sorted.;)
 
Yes in regards to the actuator, I've tried the rod adjustment from 8 threads to 13 threads and no difference, spools up quicker low end with less threads but no difference at the 3K mark ! But I'm yet unsure if the Air flow circuit fault could cause this ? With the Maf disconnected & connected it makes no difference, From what I can gather the AAT sensor on the side of the Airbox doesn't really affect the 10P engines, also cleaned the Egr to ensure free flowing and ensuring the Valve can move freely without sticking !
 
Ads1022 said:
Yes in regards to the actuator, I've tried the rod adjustment from 8 threads to 13 threads and no difference, spools up quicker low end with less threads but no difference at the 3K mark ! But I'm yet unsure if the Air flow circuit fault could cause this ? With the Maf disconnected & connected it makes no difference, From what I can gather the AAT sensor on the side of the Airbox doesn't really affect the 10P engines, also cleaned the Egr to ensure free flowing and ensuring the Valve can move freely without sticking !
Click to expand...
the basic thing is to make sure that the wastegate flap in the turbo connected to the actuator is moving freely.
Screw the EGR, it makes no difference to how your engine is running and disconnecting the MAF will prove that. As you now know.

This seems to be a regular problem and the reasons for it are many and varied.
Best of luck mate!
 
Stanleysteamer said:
the basic thing is to make sure that the wastegate flap in the turbo connected to the actuator is moving freely.
Screw the EGR, it makes no difference to how your engine is running and disconnecting the MAF will prove that. As you now know.

This seems to be a regular problem and the reasons for it are many and varied.
Best of luck mate!
Click to expand...
Yes the Turbo which is currently fitted came off my 15P ( Presuming they are the same ) which had only done 4K since being reconditioned as I have gone Hybrid Turbo and bigger cooler etc on my 04 Td5 Manual ! Which also has No Egr, No Cat, Maf mapped out and has 0 issues and goes like a dream ! Just hope I can find the little issue with this 10P as she's a low mileage (130k) on a 99 reg !
 
Ads1022 said:
From what I can gather the AAT sensor on the side of the Airbox doesn't really affect the 10P engines, also cleaned the Egr to ensure free flowing and ensuring the Valve can move freely without sticking !
Click to expand...
The 10P does not have AAT input at all while the AAP input from the airbox sensor is vital as it's part of the boost calculation together with the MAP, the MAF on the 10P has to do with the EGR only, record inputs fuelling data on SD card from a drive with nanocom to catch the symptom and post the result here then i'll tell you more untill then do a stall test maybe it reveals something
 

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