CIs wont run 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.

[C-Pierce]

I know no-one cares much for CIS but help me man!! Please..

[Jim Sims]

Have you covered the fundamentals? Did you purge/fill the fuel injection system by lifting the air metering plate with the ignition on until the plate "stiffens" and the system sound changes? Look for an air (vacuum leak). Hoses loose or missing or incorrectly connected? Is the pop-off" valve seated shut? Idle setting? How is the dwell and timing? When you had the CIS system apart did you work on any of the parts related to the mixture setting?

[C-Pierce]

I will try the priming idea. we didnt do that..

THanks

It runs sweet for a secont or two then pop and stop...

Pop off is correct yes,

Never messed with idle setting, did not purposely mess with any settings as it ran great (except for the oil leaks) when it was taken off line for the rebuild.

thanks

[fastfredracing]

Any chance you may have mixed up the two plugs on the rear of the fuel injection??, one is to the cold start, and the other goes to the sensor plate. It sounds as if it is firing off the cold start maybe.Good luck

[C-Pierce]

I got it, I had the sensor plate and air regulator black plugs mixed up, she runs like a champ.

Thanks for all the help. I wont do that again.

Live and learn

[fastfredracing]

ask me how I know!!