monk · Dec 11, 2017

hi all, nearly gone bald over this, searched and searched but, the old revving and vibration problem!
Ive changed
Turbo hoses
Air filter
Intercooler
Fuel pump
Fuel pressure regulator
Fuel filter
Egr removed
Injector harness
Cleaned ecu
Wastgate free
Fitted rev counter boost gauge
H/d front+rear props
Just had discco transferbox fitted
Think thats it to try and sort problem, basically pulls well boosts well starts well, revs straight up to say 4000rpms when stationary but get to 2500rpms underload when driving and its struggling to go past plus noise/vibrations kind of thing, really narked off with it. Dont know what else plus pocket is now very empty! Please somebody shed some light on this common pain in the ass problem!

bankz5152 · Dec 11, 2017

Huh, that is unusual. Does it feel low on power or like theres some resistance?

Got any diagnostics? Does it accelerate alright? Get up to speed alright, say 40/50?

neilly · Dec 11, 2017

I will take a guess that it is a td5.

Wild card question: I understood they are not fitted to defender td5's, but just in case does it have a wastegate modulator fitted?

Cheers

Landyfox · Dec 11, 2017

Hi I’m not completely sure on drop off, but would look at the fuel system. Could be either air/water ingress somewhere. Is it missing or juddering.

In reference to the knocking, have you checked your suspension? Sometimes the nut has been known to have come of the bottom of the shocker causing it to knock at speed. Worth checking as if it has and it unmounts, the could spring will pop out and you can roll.

nobber · Dec 11, 2017

In all fairness rather than just swap parts on a hunch why not give it to a mechanic who has the tools and know how to do a proper diagnosis on it?

frog hopper · Dec 11, 2017

Does it have a fuel sedimenter?
Had very similar symptoms with a RRC diesel recently. Sedimenter was almost full of crud, don't think it had been drained in years, as I'm doing a very long winded catch-up service and doing very few miles on it I didn't pick this up and it caused all sort of fuel problems.

nesponge · Dec 12, 2017

Injectors sucking air?
White smoke coming out the exhaust?

Get a proper land rover diagnostic computer on it... they pic up on all sorts of things cheap code readers miss such as failing sensors on the engine etc.

Get a Hawkeye if you want to do it all yourself... they are worth their weight in gold.

https://www.jgs4x4.co.uk/land-rover...fault-code-reader-works-on-all-models-ba5068/

johnlad · Dec 12, 2017

if you havent already done so, unplug maf sensor and see if it makes a difference

bankz5152 · Dec 12, 2017

All your prop UJs in good nick?

Revving and vibration may not be related to each other just happen at the same time.

monk · Dec 12, 2017

bankz5152 said:
Huh, that is unusual. Does it feel low on power or like theres some resistance?

Got any diagnostics? Does it accelerate alright? Get up to speed alright, say 40/50?

Hi yeah feels resistant at 2500rpm but upto 50/60 is fine

monk · Dec 12, 2017

neilly said:
I will take a guess that it is a td5.

Wild card question: I understood they are not fitted to defender td5's, but just in case does it have a wastegate modulator fitted?

Cheers

Sorry yeah td5, no modulator on the defender

monk · Dec 12, 2017

nobber said:
In all fairness rather than just swap parts on a hunch why not give it to a mechanic who has the tools and know how to do a proper diagnosis on it?

Hi, parts i have put on also needed doing, could of left them but they easnt in tip top condition

monk · Dec 12, 2017

johnlad said:
if you havent already done so, unplug maf sensor and see if it makes a difference

Yeah did that, replaced maf anyway just to be sure

monk · Dec 12, 2017

bankz5152 said:
All your prop UJs in good nick?

Revving and vibration may not be related to each other just happen at the same time.

Yeah replaced them all as most things on it was shafted!

monk · Dec 12, 2017

nesponge said:
Injectors sucking air?
White smoke coming out the exhaust?

Get a proper land rover diagnostic computer on it... they pic up on all sorts of things cheap code readers miss such as failing sensors on the engine etc.

Get a Hawkeye if you want to do it all yourself... they are worth their weight in gold.

https://www.jgs4x4.co.uk/land-rover...fault-code-reader-works-on-all-models-ba5068/

Yeah next thing to do allthough its trusting somebody local to diagnose what they see properly as seen so many posts on this and diagnostics didnt help

monk · Dec 12, 2017

Landyfox said:
Hi I’m not completely sure on drop off, but would look at the fuel system. Could be either air/water ingress somewhere. Is it missing or juddering.

In reference to the knocking, have you checked your suspension? Sometimes the nut has been known to have come of the bottom of the shocker causing it to knock at speed. Worth checking as if it has and it unmounts, the could spring will pop out and you can roll.

No drives spot on upto said revs

Sofasurfer · Dec 12, 2017

Don't drive faster than 50mph, job done

zeaphod · Dec 12, 2017

This reminds me of a mystery engine problem from a year or so ago - it was wear in the crank key/keyway altering the timing at speed/load. Of course, the TD5 has a crank position sensor, which could cause problems, but a good diagnostic read would pick a problem up.

nobber · Dec 12, 2017

Bring it yo a main dealer, spend an hours labour, gotta be worth the cost surely.

monk · Dec 12, 2017

Sofasurfer said:
Don't drive faster than 50mph, job done

Haha doesnt help on motorways or overtaking

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