Date: Mon, 07 Mar 2005 07:24:48 GMT
From: Paul Halliday <>
Subject: Re: Troubleshooting the Bosch CIS cold start system

in article d0ftlc$j3a$, Craig's C900 Site at wrote on 06/03/2005 21:45: >> Okay, I understand that until the car warms up, the auxiliary air valve will >> be open and the cold start injector will be pulsing fuel into the intake >> manifold. My auxiliary air valve has no current when cold and about +12V >> when warm ... That's good. What is supposed to happen to the cold start >> injector? Should it have current when cold and none when warm? > > I think that's how it works. The cold-start injector is, I think, connected > to the circuit with through the thermo-time switch and the warm-up regulator > so as the thermo-time switch warms up, the warm-up regulator reduces the > 'richness' of the fuel mix back to a certain level and the cold-start > injector is disconnected from power after a pre-set time, or sooner if the > engine is warm already. I'll look into the WUR ... Tom has provided me with some troubleshooting ideas. >> My air/fuel ratio is set to between 3.5% and 4% carbon at warm idle. > > Did you measure this yourself? If you did, what sort of equipment did you > use to work this out? I did measure this myself. I have a Gunson gastester, which read 3.7% pre-MOT and the MOT station declared it 3.9%. I have re-checked since, but it was a little windy ... Hence my guess at between 3.5% and 4%.

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