MikeMelb
Active Member
Help please, hoping the collective wisdom can resolve the problem.
Our P6B started to idle a little roughly a couple of months ago.
New leads and plugs had a slight positive effect.
Clamping the vacuum hose from the manifold to the brake power booster smoothed the idle significantly so a vacuum leak in the booster was suspected.
Through Mike Coombs a reconditioned booster (ex Dr Flynn) was obtained and fitted on Monday, again a slight improvement to idle whilst in Park or Neutral, but it becomes quite rough when in “D” or “R”. (It is possible that the recond. Booster may have a leaking diaphragm as well)
The vacuum pipe to the distributor is fine, there appears to be no leak around the inlet manifold.
Over the past two years the BW 35 has been rebuilt, engine and transmission mounts replaced and new exhaust, from manifolds back, fitted.
If I think about it carefully the roughness may have co-incided with the fitting of a new reaction valve to the brake booster and that valve (because it was new) was transferred to the reconditioned booster.
Off idle the car runs and performs extremely well, took it on a 170km run to Arthur’s Seat – holding it in “2” for a bit yesterday and it returned 10.4 litres/100km. It runs on the cool side of the temp gauge and does not lose any coolant.
Any suggestions would be greatly appreciated.
Thanks
Mike K
Our P6B started to idle a little roughly a couple of months ago.
New leads and plugs had a slight positive effect.
Clamping the vacuum hose from the manifold to the brake power booster smoothed the idle significantly so a vacuum leak in the booster was suspected.
Through Mike Coombs a reconditioned booster (ex Dr Flynn) was obtained and fitted on Monday, again a slight improvement to idle whilst in Park or Neutral, but it becomes quite rough when in “D” or “R”. (It is possible that the recond. Booster may have a leaking diaphragm as well)
The vacuum pipe to the distributor is fine, there appears to be no leak around the inlet manifold.
Over the past two years the BW 35 has been rebuilt, engine and transmission mounts replaced and new exhaust, from manifolds back, fitted.
If I think about it carefully the roughness may have co-incided with the fitting of a new reaction valve to the brake booster and that valve (because it was new) was transferred to the reconditioned booster.
Off idle the car runs and performs extremely well, took it on a 170km run to Arthur’s Seat – holding it in “2” for a bit yesterday and it returned 10.4 litres/100km. It runs on the cool side of the temp gauge and does not lose any coolant.
Any suggestions would be greatly appreciated.
Thanks
Mike K