Bosch L-jetronic problems

[Mike Fahrion]

The "Bosch Automotive Electrical Systems" handbook indicates that if 
you have a L-jetronic Cold-start valve it is limited by a "Thermo-time switch" 
which is an electrically heated bimetal switch controlled via the 
ignition and starting switch.  "During an actual cold start, the heat 
generated by the built-in heating winding is mainly responsible for 
the 'on' period (switch-off, for instance, at -20 deg C after approx 
7.5s)..."

Sounds to me that if your problem is continuing past 10 seconds or
so that the cold start circuit isn't the problem, but the warm-up
phase is. Information for this 1-2 minutes of enrichment comes from
the temperature sensor.

This is all from the handbook - not first hand experience.

Good Luck
-mike

> Hi all,
> 
> I am in need of info on when and how the cold start injector works on the
> Bosch L-jetronic, as used in my Rover 3500 SD1.  I have just completed an
> engine rebuild and there is a fairly bad miss while the engine is cold, it
> is there through the rev range.  Does the cold start only work once while
> the starter is activated or does it continue to pulse until temperature 
> rises to a certain point.
> 
> There is what appears to be some sort of air bypass, aluminium about 2
> inches by 4 inches, and two 1/2 inch ID hoses (can't remember shere they 
> connect), what is it and how does it operate.
> 
> I am an electrical/computer engineer so the more technical the better.
> 
> I am trying to sort this out this weekend so if anyone can help quickly
> it would be greatly appreciated.
> 
> Thanks for any help.
> 
> 
> Regards
> 
> 
> Tim Willis
> Newcastle, Australia
> tcw at now.inia.net.au
> 
> 
> 
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Mike Fahrion                mfahrion at bb-elec.com      http://www.bb-elec.com/
B&B Electronics Mfg Co      ph.(815) 433-5100 ext.215    fax (815) 434-7094 
707 Dayton Road                 PO Box 1040                  Ottawa IL 61350
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-