308 throttle body fuel leak and starting problem

Fuel dripping out of the throttle body?? Wow!! never seen that before!!

The only thing i could see causing that would be the fuel distributor leaking around the pintel. The woud cause fuel to pool in the bottom of the airfolw sensor. When you crank the engine, engine vac will draw the fuel into the t-body. This could also explain your hard start problem. The fuel leaking out will ciause a drop in rest pressure. This can cause vapour lock and give you a hard start problem.

 

The pintel is the part that extends down into the air flow meter. This pintel conntacts the sensor plate. As negative pressure is created by the engine the plate moves down, pushing up on the pintel causeing more fuel to floww to the injectors. You can check to see if the pintel seal is leaking by removing the fuel distributor and looking at the pintel itself. If you see fuel dripping down the sides of the pintel then it is leaking. One word of caution: do not activate the fuel pumps with the fuel distributor romoved from the air flow meter. Just pressureize the system and turn off the key. Then remove the distributor form the airflow meter. No need to disconnect any lines. Just leave everything attached and lift it off. Becarful of the little o-ring around the base of the distributor.

If you don't find a leak there then obviously more check is needed.

HTH
Tom

 

Cold start injector running too long, and flooding???

 

Yes the CSI should only work when it is cold out but sometimes the termo time switch sticks and causes the CSI to keep spraying. Just unplug the blue harness connector up on the right side of the plenum chamber. Maybe it will help.

 

I agree with Dave that the Cold start injector may be stuck on. Unplug the wire and try to start. The injector part is common to all Kjet cars (vw, volvo) -
Can test by taking it off and see if it contiually sprays when powered on. Could be a relay as well.
Good luck
rt

 

You need it for cold start, but not warm or hot start. You need to test it to see if it only sprays during cranking(normal), or if it keeps spraying when the ignition is in the "on" position(not normal)...

I don't know the test procedure for this, so tread carefully with gasoline! And seek expert advice...not from a "hack" like me.

 

The only place I know in a Ferrari Kjetronic where fuel will leak DOWN to the throttle body to drip is the cold start injector. Every other source of fuel save filling up an entire runner with fuel from a open injector) is lower than the throttle body. That's why it seems to me that that is the problem.
Not sure what you did to test, but would be concerned that 1) it leaks while under pressure 2) is inappropriately triggered from a bad relay or cold start timer. I had a the fused relay on the ECU board go bad.

Good luck
rt