starting questions

[hachiroku]

Is it normal for a car with Bosch fuel injection that I sometimes have to give the car a little gas while I start it? Shouldn't fuel injection eliminate the need to do that, is this something I should have checked out?

[benfell100]

Correct me if I'm wrong but there should be a fuel pump giving it pressure as you turn the key just before you fire her up...
Listen for it when you turn the ignition it should cycle a few seconds, or is that the power assisted steering?
Does the same thing really as pumping the peddle on a carbed motor.
Dom

[MadMaxx]

I'm in the same boat. My fuel pump does kick in when the key is turned to the acc possition before ignition, but I've yet to test the pressure.

I've got to dig out all my bosch books. I haven't had to work on a k-jetronic system in a long time heheh.

MM

[lotusguy]

hachiroku said:

Is it normal for a car with Bosch fuel injection that I sometimes have to give the car a little gas while I start it? Shouldn't fuel injection eliminate the need to do that, is this something I should have checked out?

Hi,

Sounds as if it's not a fuel pressure, but rather a fuel quantity issue. Bosche K-jetronic relies upon a 5th injector to increase the fuel quantity upon cold start-up. This is known as the cold start valve.

The cold start valve is triggered by a temperature sensor, which energizes the injector below 80°C.

I suspect that either the valve, the temp sensor or the wiring and/or relays connecting/controlling the two is errant. This is a notorious weak spot with K-jetronic.

You can run diagnostic tests of each of these things and correct the one(s) which are not operating to spec. This will most likely solve your problem. Happy Motoring! Jim '85TE