Brake servo pipe

[welder kev]

When i start up the van it pops through the exhaust and carb,the timing seems right but ive found this servo pipe which has perished and has a half inch split in it ,would this cause the misfire and popping through exhaust also ticks over but when revved it pops

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[silverbullet]

Its a vacuum/air leak and possibly an MOT fail as it affects servo performance and will mess up the mixture and vacuum advance so yes, fix it.

[welder kev]

Thanks that would answer a lot of questions

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[Aidan]

will also cause a running imbalance as the air leak on the left side causes the left side cylinders to run a little lean, you compensate by adjusting the idle screw on the carb to get CO correct but then it's all too rich and the HC goes up, failing MOT; the steel mesh reinforced hose rusts from the inside and fails/leaks

[welder kev]

Ive removed rotton pipe and blanked it off for now just to try it and runs pretty good now and tappets have stopped rattling ,only thing i found was if i put my foot on accelerator quick its got a bit of a flat spot.also what is this should it be connected to anything.

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[silverbullet]

That was a fuel pump for a Webasto or Eberspaecher heater.

[welder kev]

Oh right there is one underneath the van but all disconnected,will remove it tomorrow see if it works

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[silverbullet]

The is/was a reducing T piece in the fuel line from the tank to feed the pump, might be capped or just removed. Best to check in case you have a potential leak point.