Willie Posted May 17, 2018 Report Share Posted May 17, 2018 Hi Folks, Another question which I can't get my head around. My car as a late TR4 [July 1964] is displaying strange combustion. Twin CD175 Strombergs are fitted. Numbers 1 & 4 spark plugs look as if the mixture is leanish, whereas numbers 2 & 3 look as if the mixture is too rich! How can the front carb create lead cylinder lean and trailing [#2] cylinder rich, and the rear carb create lead [#3 cylinder] rich and trailing [#4] cylinder lean? To my amateurish eye, it just doesn't make sense! Best wishes Willie Quote Link to post Share on other sites
Willie Posted May 17, 2018 Author Report Share Posted May 17, 2018 Sorry folks, I thought the first posting hadn't worked so I rewrote the question more concisely! Yours red-faced, Willie Quote Link to post Share on other sites
TorontoTim Posted May 17, 2018 Report Share Posted May 17, 2018 No problem - I'll hide the first one. Quote Link to post Share on other sites
RogerH Posted May 17, 2018 Report Share Posted May 17, 2018 Hi Willie, if your inlet manifold is not tightened down fully or the gasket it leaking air then you could get your symptoms. For instance if #1 has a leak and the carburettor adjusted to try to get a correct mixture then #2 (no leak) will go rich. Roger Quote Link to post Share on other sites
Willie Posted May 17, 2018 Author Report Share Posted May 17, 2018 Thank you Roger. I am very relieved to hear it is not an expensive solution! Best wishes Willie Quote Link to post Share on other sites
Willie Posted May 18, 2018 Author Report Share Posted May 18, 2018 Hi Roger, Here is the layout on my car from the Moss catalogue. That emission valve was obviously a TR4A feature. Mine takes rocker breath straight through the air filters to the induction manifold. I'll check tightness of the manifold bolts. Best wishes John Quote Link to post Share on other sites
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