Date: Sun, 13 Mar 2005 10:15:54 GMT From: Paul Halliday <pjghnospamyonder.co.uk> Subject: Re: Troubleshooting the Bosch CIS cold start system
in article d0fe0c$sgi$1nospamn.btinternet.com, Tomnospamtech at saabtechnospamnnect.com wrote on 06/03/2005 17:18: > It sounds like you may have a problem with the warm up regulator, [fixed to > the side of the cylinder head by the thermostat housing], it should have a > 12 volt supply all the time the engine is running. The 12 volt supply and > heat transfer from the the cylinder head works on a bi-mettalic strip which > controls the fuel pressure to the fuel disributor and thus the injectors, > when the engine is cold the pressure is higher and as the engine warms the > pressure lowers [control pressure], If said device is fault then it makes it > immpossible to correctly set idle speed for both cold and warm. You really > need a fuel pressure gauge to diagnose properly, but a good indication is if > you have access to a co meter, disconnect the vacuum/pressure hose that is > fitted to the regulator, plug the manifold and apply about 10 psi to the > regulator and this should increase the co to about 7%. If no difference or > a small increase is noted then the diagphram inside the regulator is > knackered. Hi Tom ... Just to recap on this one. When the engine warms, how does the system lower fuel pressure? Does the bi-metallic strip open or close current to the fuel distributor? Paul 1989 900 Turbo S http://saab.go.dyndns.org/
 |
 |
 |
 |
 |
