mit

iTrader: (10)

Hi all,ive just carried out a parallel fuel rail mod,fuel reg,breather pcv bypass,and inlet manifold insulators,and have a couple of problems.

Firstly,the fuel pressure drops off straight after the engine's turned off,yet the system had loads of pressure in it when disconnected before mods. The new regulator makes a hiss,and pressure goes. I've checked the diaphram,and its good.

Secondly,when i disconnect one or both the coil packs on the drivers head,the idle doesn't really change,yet almost stalls on the passenger side.

Lastly,the car has irratic boost,which i thinc may be linked to the fuel problem. It boosts anywhere between 10-16 psi(should be 16).

Any thoughts would be much appreciated!!

Mit

mit

iTrader: (10)

Just an update,im sure the reg is faulty. When the fuel pump primes the system,the gauge only reads 20psi(1.35 bar),but dropsto zero instantly. I then blocked the fuel tank return line on the reg,to see if i had a damaged injector seal ect,and it pressurised so much the pipe blew of the reg!! This tells me the system is good,so back to the reg! This must mean that the rising rate 1.1 is probably not happening,hence the boost fault.

mickywrx

iTrader: (29)

Are you sure? How does it fire with no spark?

mit

iTrader: (10)

I know,it's strange! It idle does dip for sa second,but then returns to normal(ish).

mickywrx

iTrader: (29)

It surely cant fire on one side with no coil packs fitted to that side?

mit

iTrader: (10)

The idle is lumpy anyway,so im thinking that the coil pack connectors might be dirty,as i had a power steering leak there. If i rev the engine a little ,it smooths out nicely. It looks like it's missfiring at idle.

mit

iTrader: (10)

Right, problem solved! The new fuel regulator is rubbish! It's leaking pressure. I slaved the standard one back in and all's good. I can only assume the poor idle was also a fuel problem as thats gone to.

Thanks,Mit