CIS first start help

[C-Pierce]

Hi,
freshly rebuilt 2.7 CIS. runs great for 2-5 seconds then might back fire and stops running.
Maybe only firing when the cold start injestor fires?

re-built with Rick Cabell a good friend and Porsche Guru, His Mother is dying and he does not have time to help me untill who knows.
So I am gonna tackle it tomorrow
any ideas? on where to start.?

got spark and new injectors, fuel is good, great spray pattern, we had the whole CIS apart and cleaned and refurbed all parts.

is it possible there is an air lock in the lines? fuel starvation?


Car ran great when I/we pulled the motor.

[CliffBrown]

Originally posted by C-Pierce
got spark and new injectors, fuel is good, great spray pattern, we had the whole CIS apart and cleaned and refurbed all parts.

is it possible there is an air lock in the lines? fuel starvation?

Can we assume you checked the spray patten while the injectors were being fed fuel from the fuel distributor in the car?

If not, then you might prime the system.

Turn the ignition key to the on position, make sure you can hear the CDI humming, and the fuel pump running, then lift the air sensor plate briefly until you can hear the injectors flowing.

Wait several minutes for the excess fuel to evaporate and try to start.