HI I HAVE REMOVE THE AIR MANIFLOD FROM THE ENGINE TO CHECK THE GLOW PLUGS WHEN I START THE TD4 UP THERE IS A LACK OF POWER AND WHITE SMOKE FROM THE REAR IS THIS THE NORMAL WHEN THE AIR MANIFOLD IS OFF.
the air-filter
the MAF sensor ..
the turbo
the intercooler
the air-intake-temp sensor ( either together on the MAF .. or separate on the intercooler hose )
EGR valve ( if fitted )
the MAP sensor
I ran my TD4 with new silicone hoses fitted but not tightened up. Smoked like a train even while only ticking over. Soon as I tightened them up it was fine.