I'm having difficulty with my 504 turbo. I am after some suggestions as to what the problem may be. The car starts and idles fine, but it develops a miss at about 2,500RPM and when it is driven it will start to go, but about 5 seconds later it starts coughing and dying and won't accelerate any further.
My main though is that it is a fuel problem, as if it were ignition it probably wouldn't idle as well as it does. If you're familiar with the vehicle, it runs a Ti lift pump which is regulated to about 2psi above manifold pressure via a fuel regulator with a boost reference. Now, watching the gauge that I've put on the regulator it would flicker from about 1.5 to 2.5 psi a lot. I thought that it may be a problem with the pump, so have tried another pump which seems not to flicker, but only holds about 1 psi fuel pressure. The car behaves the same no matter which pump was on it.
What are your thoughts? Does it sound like a fuel pump issue? If so, can I source a brand new Ti lift pump? Or should I use an entirely different pump all together? Running at 14 psi boost on the turbo, the fuel pump only needs to be able to supply fuel at a constant 16 psi, where the lift pump in the Ti is rated at about 35 psi. Should be sufficient?
Where would I be able to get a new Ti lift pump?
Are there other things I should check but may have overlooked?