wickford90

wickford90

Well-Known Member
This has happened a couple of times recently and seems to be getting worse, when at top end of revs the engine seems to cut out, feels almost like its being limited. happens in 5th at just before 70,( sorry no rev counter ) its a 2001 defender with 103k on the clock always serviced and looked after, been remapped by Dynachip. Will clean the red plug tomorrow, it had some oil around it a while ago maybe more has returned since i cleaned it. In the process of trawling through previous posts.
 
sounds like overboost, has someone shortened the actuator arm,
if you have a hawkeye or similar you can check the live data
 
yep, sounds like overboost to me too. Try giving it a blast with wd40 and then work the rod back and forth with a pair of mole grips.
 
ratty said:
yep, sounds like overboost to me too. Try giving it a blast with wd40 and then work the rod back and forth with a pair of mole grips.
Click to expand...

Ok done that, how much movement should there be as mine hardly moves at all, a few mm with engine off, or should i have the engine running?
 
no need to run engine but it shuold have more than a couple of mill disconect the rod at the turbo side it should then be flopy if not its siezed
 
...or undo the two screws on the valve, release the valve and move the rod together with the valve...it will move very hard in situ.
 
Thanks, will have a go at that tomorrow. Am i right, its not the turbo end seized/stiff its the actuator, if so should i just get a new one.
 
Last edited:
Mine was siezed and was limiting at around 3000rpm under load. Could creep upto around 4000rpm with very light load but then would suddenly die and go into limp for a few moments.

Was stuck actuator too so I solved it by fitting a new one attached to a VNT turbo :D
 
wickford90 said:
Thanks, will have a go at that tomorrow. Am i right, its not the turbo end seized/stiff its the actuator, if so should i just get a new one.
Click to expand...

usually the turbo side is sticking...the actuator has a membrane/diaphragm within moved by vacuum i doubt it could get stuck...it just might crack and not respond to the vacuum action, that's possible
 
sierrafery said:
usually the turbo side is sticking...the actuator has a membrane/diaphragm within moved by vacuum i doubt it could get stuck...it just might crack and not respond to the vacuum action, that's possible
Click to expand...

If i disconnect from the actuator is it safe to give the rod a good tug in and out to try and free it up or will it damage the turbo.
 
wickford90 said:
If i disconnect from the actuator is it safe to give the rod a good tug in and out to try and free it up or will it damage the turbo.
Click to expand...

Yes. Initially it may keep jamming but it will then start easing off.
 
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