Why why why does my tachometer needle rise and fall ever so slightly at idle?? and now that it has gotten colder out, ive noticed that it wont happen ALL the time when its cold, but it still is happening. Anybody know what the hell is causing this??
Let us know what you find. I have the same deal going on.i am almost certain that it still occurs after the truck warms up. but im going to observe it today and get back to ya, motorboat. maybe i should mention that i am highly suspicious of having a possible out of spec valve(s) or a bad injector currently as well. Doubt it, but Could either one of those issues cause a small fluctuation like im having? thanx guys