Having problem with turbo overboost. Replaced turbo pressure sensor and solenoid and thought all was good when driving around ... normal max around 18psi.
This morning drove for around 40 mins all good. Reached Mt Ousley (long & steep) all OK in the first half of the climb then changed down to 4th and the boost pressure increased ... up to the 35 psi max on my auto meter gauge. I backed off as much as I could but the pressure was still well above 20 psi until I reached the top of the mountain.
Turned around and drove down the hill and stopped for over an hour just in case it was heat related (I'm running out of possibilities). No code thrown (I have a scan gauge).
Continued home (about 30kms) keeping boost as low as I could get. Took it out for a drive around the block after a few hours and same behaviour i.e. I can get boost to 35psi without too much effort on the flat.
No performance issues i.e. if I didn't have the gauge I wouldn't know there was a problem. The gauge moves normally i.e. nothing jerky, smooth as you would expect. It's like there's no pressure limit.
The only other out there possibility I can think of is that under load and heat the turbo vanes stick. Don't think it's the gauge because it behaved normally to the overboost trigger point.
Would appreciate any educated advice. I haven't been able to find any other situation like this having spent quite a lot of time researching.
This morning drove for around 40 mins all good. Reached Mt Ousley (long & steep) all OK in the first half of the climb then changed down to 4th and the boost pressure increased ... up to the 35 psi max on my auto meter gauge. I backed off as much as I could but the pressure was still well above 20 psi until I reached the top of the mountain.
Turned around and drove down the hill and stopped for over an hour just in case it was heat related (I'm running out of possibilities). No code thrown (I have a scan gauge).
Continued home (about 30kms) keeping boost as low as I could get. Took it out for a drive around the block after a few hours and same behaviour i.e. I can get boost to 35psi without too much effort on the flat.
No performance issues i.e. if I didn't have the gauge I wouldn't know there was a problem. The gauge moves normally i.e. nothing jerky, smooth as you would expect. It's like there's no pressure limit.
The only other out there possibility I can think of is that under load and heat the turbo vanes stick. Don't think it's the gauge because it behaved normally to the overboost trigger point.
Would appreciate any educated advice. I haven't been able to find any other situation like this having spent quite a lot of time researching.