intake manifold leaking

[caravanmad]

hi. been have surge problems, went on dia machine no faults, so just been on smoke machine checking air valves.
com up intake valve bank 1 cylider head 1 any sugestions
andy

 

[Howard]

Check the lower intake manifold 'o' rings. They are known to get hard and leak. They come as part of the oom12 kit and I've done plenty of them and in every case the lower 'o' rings where leaking.

 

[caravanmad]

will try that if all else fails, im going to replace gasket first, then c what happens
thanks again