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3 cylinder zetec.
Myke 2463 - 6/6/16 at 10:41 AM

My 2.0 silvertop is only sucking on 1 2 3 not no4.
running GSXR 600 tb all opening together.
Compression on all 4 is 140 bar with tb's open, leads, plugs and coil all working ok,

Could there be a problem with hydraulic tappets, ?

Any ideas welcome Cheers guys somebody always has the answers on here.

Daf - 6/6/16 at 11:16 AM

What exactly do you mean by sucking? If you're getting the same compression across all 4 then the same amount of air must be going in. Problems with tappets and valves would show up on a compression test.

Have you tried balancing the throttle bodies with a proper balancer - this makes a massive difference to the running of the car in my experience.

Ugg10 - 6/6/16 at 12:10 PM

manifold, injector or connecting rubber air leak, have you pulled the plugs to see what colour they are or looked at exhaust header temperatures ?

MikeRJ - 6/6/16 at 12:48 PM

quote:
Originally posted by Myke 2463
Compression on all 4 is 140 bar with tb's open, leads, plugs and coil all working ok,


140 bar would be impressive, hopefully you mean PSI

As said, you need to clarify what you mean by "not sucking".

chris - 6/6/16 at 06:07 PM

I had the same problem when I was running bike carbs on a pinto I tried everything to cure it in the end changed the head gasket and that cured it