91 300E. when going at 150-180+km/h and letting the gas go and coasting, there is a noticable whistleiling/ whining sound. i dont think its the wind, what do you think it could be. also is not all the time, its interrmittint
not wheels and not the sterio as i put my summer wheels and tires on last week same thing happened before and after and the sterio was off when i last checked. also you hear it from the driver seat. it might be from the engine, but i cant be sure. it cant really be pin pointed to a specific spot. but its definatly not those 2 things. so im not really sue what my next step is...
Vacuum leak? Engine manifold vacuum goes way up during decel. Did 91s still have the economy meter in the cluster? If so is it behaving normally? Otherwise a vacuum leak could come from a brake booster or climate control system tubing.
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