Rb25det Sounding Like Running On 5 Cylinders.

[mxkal]

I have been building an rb25det s13. I have just started it last weekend, I started it with some temporary pvc pipe from turbo to throttle body and its sounding like its running on 5 cylinders. It doesnt idle and the engine shakes a fair bit. I have spark in all 6 cylinders also. Just wondering if it would do this due to not having the idle speed controls plumbed into the intercooler piping so the afm can read them.

Any help would be great

Thanks

[Craved]

if you have a lump or burble on idle that sounds like runing on 5 - then if not spark it could be a bent valve or the injector not firing on one cyl.

[mxkal]

well i got compression on all cylinders. Its not just idle, when it revs the motor shakes also and backfires a fair bit.

[blind_elk]

Well, have you tested to see which cylinder(s) cause the rough running?

[mxkal]

Nah, Id say its probably 6. It was my mates engine out of hes r33 that he gave to me for free. When i opened it up to give it some new seals and gaskets it had dents in combustion chamber from a spark plug failure. No valve looked bent and im pretty sure it has same compression as all other cylinders. Il check it later tonight.

[Craved]

checked injector plugs and wires?

[mxkal]

All injectors are firing, All plugs are firing. I know its #6 because when i take the plug out of coil pack on number 6 it sounds the same. But when i pull the coils out and put the plugs in them they spark. Also the other 5 cylinders have 175psi compression. #6 has 150psi. Ive got a brand new head that il start to assemble and il just throw that on when i finished the rest of the mechanical.

[lunjiaow]

Maybe ignition module, sits on top of the coilpack cover.

[mxkal]

Maybe ignition module, sits on top of the coilpack cover.

well all the plugs have spark. Would they have spark if im running a series 2 ecu (built in igniter) and also a series 1 ignition module?. The whole car is built up of all different series r33s and silvias. :S