stallie Posted October 26, 2008 Report Share Posted October 26, 2008 The car runs well, starts OK and does not run on at all. It idles happily at 650rpm. When I remove an injector to check the spray, the RPM increases to 1050RPM. To my mind, would this say that the engine is running rich? Shouldn't reducing the amount of fuel decrease the RPM? Thanks in advance Dan Quote Link to post Share on other sites
Jersey Royal Posted October 26, 2008 Report Share Posted October 26, 2008 (edited) The car runs well, starts OK and does not run on at all. It idles happily at 650rpm. When I remove an injector to check the spray, the RPM increases to 1050RPM. To my mind, would this say that the engine is running rich? Shouldn't reducing the amount of fuel decrease the RPM? Thanks in advance Dan Dan, Mines the same the revs increase when you remove an injector to check, so i think thats normal. Cheers Guy Edited October 26, 2008 by Jersey Royal Quote Link to post Share on other sites
Mike Collins Posted October 26, 2008 Report Share Posted October 26, 2008 Mine increases too, removing the injector allows air into the manifold, presumably bypassing the idle control valve. I have a suspicion mine is a bit rich at idle, but then I'm used to the smell of modern catalytic convertor exhausts. Quote Link to post Share on other sites
PILKIE Posted October 26, 2008 Report Share Posted October 26, 2008 Hi Dan. Removing an injector to check its spray cone is creating the same effect as a manifold gasket leaking air into the system,which effectively will weaken the mixture and cause the rpm to increase! Normally, as long as everything else is all set up ok,an over rich fuel mix will cause things to slow down,"pull the choke out when its warm and see what happens" As long as all injectors are giving a good cone spray when you check them, and if your car starts,runs,idles,responds ok,then dont mess with it! Dave Quote Link to post Share on other sites
stallie Posted November 1, 2008 Author Report Share Posted November 1, 2008 Thanks for the replies. I'll think a bit more about it. Not fully convinced I understand the way it all works yet though! Quote Link to post Share on other sites
Wilfried Posted November 1, 2008 Report Share Posted November 1, 2008 Have you tried to plug the hole that is created by the removed injector, whilst it is running at 1000 rpm? When plugged, the is no air entering anymore the collector and the engine will run on only 5 cylinders and (I guess) slower than the normal idling speed. Wilfried Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.