I have what sounds like a valve lifter noise

Asked by Jul 17, 2017 at 03:40 PM about the 1999 Chevrolet Tahoe 4 Dr LS 4WD SUV

Question type: Maintenance & Repair

I have what sounds like a valve lifter noise once the motor hits 2300 RPM. it is
even louder when I am towing my trailer. I have a new GM create motor, new
injectors, new o2 sensors, new cats, new distributor, and some other new
sensors. this was happening with the other engine and now with this one. I
was just looking at the new cats and one of them have turned blue in color like
it has gotten very hot. when the truck is making this noise it does not have the
power that it once had nor does it get the fuel economy that it once had. when
the noise is gone everything is great. yes this noise comes and goes. some
people seem to think the noise is the engine knocking. oh and it also just
passed smog with flying colors. I am at a loss here and I still have a few years
that I need to keep this truck to pull my trailer. thanks Cal V.

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