Engine knock/pinging

Noah Silbernagel

Asked by May 22, 2016 at 12:27 AM about the 2004 Infiniti I35 4 Dr Sport Sedan

Question type: Maintenance & Repair

I have a 2004 I35. Has a Nissan VQ35
engine with only 80K on it.  The car runs
great. Oil is good, all filters and fluid levels
are good, but when in second gear and
accelerating under a load (uphill or with a/c
on) there is a distinctive engine pinging. It's
not extremely loud and there's zero loss of
power; when I hear it and punch it all the
power I want is still there.  It only does it
between about 2 & 3 thousand RPM,
usually only when in 2nd gear about to
shift to 3rd and under a load. Sometimes
it's does it going from 3rd to 4th gear
around 45 mph, but it's usually only when
I'm between 2 & 3 thousand RPM under
load. I've tried using only 93 octane (used
to use mid - 89) and have added tune up in
a bottle as well as other various additives
(Gumout, Lucas, octane boosters, etc.)

Could it be a bad EGR valve? Or maybe a
faulty knock sensor? Maybe something
with the timing? I'm trying to break down
diagnosis before taking to my mechanic
because I feel it may be something they
chase for hours without being able to
diagnose or fix. It's not a major
performance issue currently but I don't
want it to turn into one because I love this
car and it runs great currently. It's just
annoying more than anything.

3 Answers


Have the system live data scanned, the tech should be able to see in real time if the sensors are reading properly while running down the road and advise you what needs to be corrected. Hopefully it is just a knock sensor that is not functioning as well as it should. When was the last professional injector cleaning? It could be some carbon build up in the combustion chambers.

Noah Silbernagel

Never had the injection system professionally cleaned to my knowledge. I will look into it, thank you!

1 out of 1 people think this is helpful.

" If after having your injection system cleaned and you still have that Pinging. Option 1 Use a Catalytic converter cleaner. Everybody that I know that have used this product Called CATA-Clean. Has solved the problem with the I-35 from 2002 to 2004. Option 2 although your car may pass inspection the pinging is from the CAT.

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