Hi all!
We're in the middle of a house move, so borrowed the box trailer from work, towed all day, everything fine, dropped off trailer in yard, totally unladen Landy on the drive home, in top gear I decided to put my foot down a bit more than usual (usually potter around the 45-50 mph zone on the small roads here), when I got past a certain number of revs, past 55-60 I had my foot flat so was still accelerating and then heard/felt this weird hunting noise like I was going on and off the throttle, although I wasn't, and it would accelerate past this, I turned engine on and off and accelerated again, and it did the same thing.
It almost felt like maybe a sticky turbo actuator, although when it's ceased a bit in the past and goes into over boost it usually just goes into limp mode and top speed is 50mph until ignition is turned on and off again, but it wasn't doing this! It then did it in 4th under hard acceleration towards the high end of the rev range just as I'd usually change up.
I've looked at actuator and although it was sticky did move after a fair effort. I wd40'd it and adjusted wastegate so there are 10 threads instead of 13. (I did this before after remap and it improved, but then turned it back to normal setting when I fitted the straight through exhaust on. It always over boosts sooner with the more free flowing exhaust, but I've never had this hunting, surging effect before!
It drives absolutely spot on anything up to 50 mph and I'm usually on top gear at 25 mph, so only under hard acceleration, although as said, never this. Any pointers would be welcome as I hate any potential reliability issues cropping up! Thanks!
We're in the middle of a house move, so borrowed the box trailer from work, towed all day, everything fine, dropped off trailer in yard, totally unladen Landy on the drive home, in top gear I decided to put my foot down a bit more than usual (usually potter around the 45-50 mph zone on the small roads here), when I got past a certain number of revs, past 55-60 I had my foot flat so was still accelerating and then heard/felt this weird hunting noise like I was going on and off the throttle, although I wasn't, and it would accelerate past this, I turned engine on and off and accelerated again, and it did the same thing.
It almost felt like maybe a sticky turbo actuator, although when it's ceased a bit in the past and goes into over boost it usually just goes into limp mode and top speed is 50mph until ignition is turned on and off again, but it wasn't doing this! It then did it in 4th under hard acceleration towards the high end of the rev range just as I'd usually change up.
I've looked at actuator and although it was sticky did move after a fair effort. I wd40'd it and adjusted wastegate so there are 10 threads instead of 13. (I did this before after remap and it improved, but then turned it back to normal setting when I fitted the straight through exhaust on. It always over boosts sooner with the more free flowing exhaust, but I've never had this hunting, surging effect before!
It drives absolutely spot on anything up to 50 mph and I'm usually on top gear at 25 mph, so only under hard acceleration, although as said, never this. Any pointers would be welcome as I hate any potential reliability issues cropping up! Thanks!
. I had used wd40 to lube the slides, never again.
