After timing belt change, engine has developed an unusual noise similar to adding a performance cam shaft on an engine. Engine starts, idles and runs fine. May have lost one MPG on gas mileage. After driving several miles, car will often begin to sound normal, only to return to unusual sound next time it is started. Changed water pump, drive belt, tenisoner, spark plugs and air filter, in addition to timing belt. Someone has suggested cleaning/replace EGR valve. Is anyone experience anything similar to this?
Unusual engine noise after timing belt change on 2005 MDX
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Not sure what you mean by this
Usually a performance cam gives a rougher idle. Do you mean a light tapping sound, like solid lifter engines?
Also, to confirm: It happens when the engine is cold and goes away as it warms up?
One quick check you can make is to look carefully at the drive belt and make sure that it is sitting on all the pulleys properly, not one or two grooves off.
A mechanics stethoscope may help you locate the source of a noise, especially if it is under one of the T-Belt covers.
Thanks for your comments.....by "this" I mean the performance cam like noise. I definately appears to be intake related. I failed to mention the noise does not appear at idle, but only upon acceleration. You make a good point, it is unusual to have a performance cam like noise without the rough idle of a performance cam. I will double check the drive belt alignment, but they appear fine. I will have to source a mechanics stethoscope to check further.
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Almost sounds as if the hydraulic tensioner is weak.....
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