ivantruckman Posted October 1, 2015 Share Posted October 1, 2015 (edited) I have a 1991 loyale spfi . when I accelerate the vents go to center . and my acceleration is sluggish . I used a vacuum tester and found no leaks in the duct system lines , I tested the egr , and even the manifold lines . im wondering if the leak is only under load , perhaps its the manifold gaskets , but I get no change in rpm with carb cleaner . I cant seem to find it Edited October 1, 2015 by ivantruckman Quote Link to comment Share on other sites More sharing options...
DaveT Posted October 1, 2015 Share Posted October 1, 2015 There is supposed to be a check valve and storage tank in the feed between the manifold and the heater controls. If the check valve is missing or stuck open, that's what you get. Or if the tank is moderately leaky. 1 Quote Link to comment Share on other sites More sharing options...
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