Originally Posted by
Campdog
So because I hate finding a thread with exactly the same problem but the guy failed to say what fixed it, here is what fixed it.
The original problem. was surging on loading the engine while towing.
1. Replaced Turbo Modulator. Fixed surging, but power down while towing, like no turbo. Unloaded it was noticeably zippier though!
2. Nanocom said MAF reading was below spec and "Driver Demand Error #2". Replaced MAF. No change.
3. Cleaned MAP sensor, it was really dirty, no change.
4. Tested Turbo gate pivot and actuator, working fine.
5. Replaced Brake sensor as possible cause of the error. No change.
6. Recorded Nanocom file to find that it went to Max Boost then to Zero, returned to boost when returned to below 1.3 Bar.
7. Removed and inspected air hose on both sides of the turbo for de-lamination, both were perfect.
8. Played with different arm settings from 11 threads to 16 to see if over-boost could be stopped, made no difference.
Waited a month to get it looked at by Land Rover specialists.
Rang and told me that they discovered that I had installed the Turbo Modulator incorrectly, two of the three air lines were reversed. That means that as soon as it got to max allowable boost, it dropped all boost!
My fault. Sorry Disco for cursing you.
Thanks to those who offered help here, much appreciated.
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