Well I'm going to go through all the options with you guys and see if I can eliminate the components. A while back I mentiond that the JTD used to overboost occasionally while on track. This would put it into safe mode and I'd have to turn it off and on again to sort it. I could only ever replicate the problem on track and so I never got round to seeing if the problem had been fixed. It used to boost to about 1.8 bar when it did this error. Now the mrs has been driving it for a few weeks as she is too lazy to sort out her own car
(thats another story which I will probably rant about at some point) and she said that it went into safe mode the other day. It did it once with me the other week too but as I wasn't expecting it I wasn't looking at the boost gauge. Well today I took the JTD to work and it would seem the problem has got massively worse. Got onto the dual carriageway and on it came as I accelerated up to 70.
Pulled over in a layby and switched it off. Pulled out and accelerated and it did it again. So pulled over again to pay attention to the gauge. It's a defi electronic gauge which are known for there accuracy and it measures boost pressure at the beginning of the plenum so I'm confident these figues ar correct. Under hard acceleration it goes off the end of the gauge at 2 bar
Then you get the light after a second or too. Trying various things I can't use full throttle for more than a second or it spikes the boost and it seems to be running about 1 bar in 6th at 70mph or partial throttle when it used to be running aroun 0.5-0.7 bar so there is definitely a boost issue at all parts of the rev range. If you drive it at high revs (3.5K+) it overboosts even on partial throttle. Also when trying not to get it to spike the boost which used to bleed at 1.6 bar and stay static ish at 1.6 bar is now all over the place between 1.4 and 1.8 bar. It's like it can't bleed it off in a controlled fashion.
So things I have done in the past.
Changed the VNT hoses
Cleaned the MAP sensor which was clogged.
Possible things I think it could be
Need to clean MAP sensor again
MAP sensor is bust
VNT solenoid ( one on the back of the rad) is not functioning properly
Turbo issues with the vains getting stuck.
The car is remapped, has full turbo back exhaust with no cat and one silencer, egr delete, and high flow filter.
Any suggestions would be appreciated
BMW E12 M535i, JC racing diff, Gaz coilover, Powerflex.
Alfa 156 GTA, Q2, Super sprint, CF2, EQ, KW coilovers, Eibach rollbars, Powerflex.
but not as high as Keithy! No Gibbo....I don't need a haircut AO Troublemaker!
You have been warned