Last summer, my '94 GS-R started having a problem with a very light
knock under load at low rpm. The problem has slowly gotten worse in
that the knock is noticeably heavier now. Not really a problem - yet
- but it has gone from curiosity to annoyance.
The car has 145K of hard use. Generally maintained well but may be
coming due for some routine items and about 30K since its last valve
adjustment. I use Mobil 1 but I only change it twice a year. Engine
all original and stock except for a header to replace the noisy
A-pipe. Other than the knock, the engine runs great like always.
The first thing that you should do is to adjust the timing--If you have
never done this before--have a mechanic do it for you.
If that does not solve the problem, you should have a complete tune-up.
Mechanics use a Diagnostic Computerized Engine Tester when performing a
tune-up. That means the mechanic can easily find and repair any problems
that are the cause of the "knock". When I had a "knock" problem--I solved
it by adjusting the timing but there are other causes. Also, attempt to find
out whether or not your car has a "knock sensor". If it does have a knock
sensor--it might need to be replaced.
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Your GS-R has anti-knock sensors. This means it retards the timings when the
car pings. Usually, the computer should throw a engine code when they
malfunction, as it's doing in your case. Maybe something else is wrong with
your engine? Too much carbon in the intake? worn plugs? cables? distributor
What kind of knock are you having? I noticed my 95 Civic EX havindg a
little piston slap on cold mornings that I completly eliminated by using
Castrol GTX High Milage oil.....Next,I also use plus gas to keep engine
knock completly under check. Paying an extra 10 cents a gallon for gas for
me equals about $0.75 per week. The Honda Acura engines are very high
performance and I suspect my milage may even be a little bit better using
89 octane. I know eliminating piston ping will contribute to the longivity
of my engine.
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