05 TD4 iregular throttle response?

wouldn't hurt to check the injectors

been a few tales on LZ hippo pages regarding bad idle vibes 'n faulty injectors

i use that 'diesel rhino' additive ( details on the page link )
( mainly 'cause i used the previous incarnation 'diesel aid' when running hgvs
( was well regarded by mechanics / drivers / contractors at the time
it provides lubrication .. added cetane .. cleans the fuel system ..
gets rid of water in the fuel .. and combats diesel-bug

also check the connector plug to the fuel rail sensor for dirt / corrosion

btw: i think td4 idle should be 780 rpm .. it will fluctuate up 'n down a few rpm
( can be checked with an odb gauge ..
( i use a 'scangaugeII' on the dashboard
~~~~~

hope the garage finds the problem

Quick update, removed egr valve and cleaned it, was quite dirty but not stuck open at all. refitted but made no difference to 'lumpy idle'
Disconnected MAF but this made no difference, possibly made idle worse.

Added a dose of Millers Eco Max to the tank of Esso diesel put in last night and took for a run.

From cold idle and pulling off was poor, about 2 miles from home felt a sudden improvement, possibly when up to temp, but was much more responsive, quiet etc, though was cured. Drove for about 5 miles, with some stop/starts at junctions and all was ok. Stopped and lifted bonnet and engine idle fine. 2 miles further stopped at traffic lights and idle speed low and lumpy again. Rest of journey sometimes OK but mainly poor.

Booking into garage next week.

Possibly a stupid question but original diagnostics indicated turbo solenoid, if this part faulty would this effect idle/low revs running? As over 2000rpm engine/performance seems ok

andy20166 said:

Possibly a stupid question but original diagnostics indicated turbo solenoid, if this part faulty would this effect idle/low revs running? As over 2000rpm engine/performance seems ok

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It did on mine - see post 4 above - i think mine stuck open (?) and the turbo was boosting even when idle, which caused the ecu to drop the fuel to compensate and the revs just hunted at idle.

Also worth reading the sticky "lack of power at 70" sticky thread as that is the same part that fails: http://www.landyzone.co.uk/lz/f9/td4-lack-power-70mph-fixed-77147.html

nickcc said:

Check crankshaft pulley isn't loose as this could result in broken crankshaft. Might sound a drastic suggestion but TD4's do suffer from crankshaft failure.

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very true , my crankshaft snapped last year , also pully fell apart , check it isnt comming adrift

Just s quick update.

Been to a local Land Rover garage today for diagnostics. Showing injector fault ( no 1). Going in on Monday to be replaced. No other faults showing on computer so hopefully problem will be sorted.

Final update -

Faulty cured today with replacement of injector. Running well now and only cost £235 so smiles all round

Thanks to all that had an input.

Glad you got it sorted, mine is going in tomorrow for similar symptoms.