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Originally Posted by ASPEC135i
For those whom have done valve cleaning. Could you share your experiences please???
Performance gains? Fuel economy changes???
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Performance gains are not to be expected unless your valves are completely covered in gunk. At this point you'd be restoring power and not gaining any.
Fuel efficiency I noticed a small change. I immediately or about 5-10% better mileage and after a few thousand I saw approx 12-15%. I was getting only 400km/tank and then saw 450+/tank. Keep in mind I added a Stett CAI and that may of helped somewhat due to lower temps.
Cleaning valves is usually more so to cleanup rough idling, jumpy gear shifting and other small irritating issues with fuel management and response.
I definitely recommend it and then throw on a catch can to help keep it clean.