Originally Posted by gamefreakgc

Those are Iridium plugs which are recommended to run with a supercharger because you want a colder plug. I run the Iridium Denso IK22's with great results and no pinging. However, the electrode tips do look worn, hard to say just from looking what the gaps might be.

You can run double-grounded copper plugs with a supercharger but you might get some pinging from it. If there was a double-grounded colder Iridium plug that'd be perfect, but I haven't seen one at a decent price yet. The single ground basically cuts their lifespan in half and can cause the gap to get too big. The second photo resembles how my spark plugs look color-wise, maybe a tad bit lighter though.

Your compression number look good though, you'd notice a significant drop in one of them (cylinder 2) if there was a problem with the valves. I would clean the MAF and make sure everything else looks good fluid wise to see if you find any clues, otherwise it sounds to be your injector (if your coil pack was bad, you'd have two cylinders not firing).

Originally Posted by gamefreakgc

Those are Iridium plugs which are recommended to run with a supercharger because you want a colder plug. I run the Iridium Denso IK22's with great results and no pinging. However, the electrode tips do look worn, hard to say just from looking what the gaps might be.

You can run double-grounded copper plugs with a supercharger but you might get some pinging from it. If there was a double-grounded colder Iridium plug that'd be perfect, but I haven't seen one at a decent price yet. The single ground basically cuts their lifespan in half and can cause the gap to get too big. The second photo resembles how my spark plugs look color-wise, maybe a tad bit lighter though.

Your compression number look good though, you'd notice a significant drop in one of them (cylinder 2) if there was a problem with the valves. I would clean the MAF and make sure everything else looks good fluid wise to see if you find any clues, otherwise it sounds to be your injector (if your coil pack was bad, you'd have two cylinders not firing).

Originally Posted by LittleCaesar

They all look a little rich. If the O2 sensors haven't been replaced, do so with Denso ones off Amazon. Shouldn't be too expensive.

Originally Posted by TheDurk

Ok. That didn't sound right so you made me look it up.

Not quite. That's a BKR5EGP, so it's platinum, not iridium, and it's the same heat range #5 as the OEM BKR5EKB-11. Iridiums would have I or IX instead of GP. At least that's what the NGK web site tells me. A colder plug would have a number greater than 5. Absent the S/C, the black deposits would suggest he might need a hotter plug, not colder.

As I know nothing about superchargers, I'll stop there, except to say that platinum is not that big a step up from the nickel plated copper, and probably a step down when you go to single element from double in terms of life. Iridium is a different ball game in performance and cost.

BTW, bad coils frequently fail only on one plug or the other. I know it's not logical, but the detection systems are not perfect. I used to think that way, until life taught me different.

https://www.ngksparkplugs.com/assets...bols_plugs.pdf

Originally Posted by gamefreakgc

For the OP: the pinging can be in part the spark plugs. If the engine needs a tune-up the pinging gets worse. I highly recommend also turning on the "ECT Power" button and keeping it on full-time, it will eliminate some of the pinging you might get at lower RPM's.

Originally Posted by fourfive

I always wondered if the occasional tap sound I was experiencing with heavy acceleration on the highway was considered pinging, spark knock, spark plug arcing or any of the other engine knocking noises I've heard about. It was a very faint tap & would hear it usually only once or at most 2-3 tap sounds in a row. I never found a youtube vid that had a similar sound to what I was experiencing because most of those vids had repetitive taps like a machine gun. I was also thinking a possible exhaust leak.

The tap hasn't happened since my last tune up so I never did figure out what the actual cause was.

Originally Posted by gamefreakgc

Pinging sounds like sort of a metal grinding noise, almost like something rattling around in a metal container. It has no rhythm or pattern to it. An audible "tap" noise that changes with RPM's is usually a valve tapping because it is out of spec, a "ticking" noise is usually the injectors or the fuel pressure regulator just being noisy.

Originally Posted by Hlmyd2002

Hi all,
I know this thread is 2 years old. but I have similar problem my 4runer 2002 (180K miles).
here is my problem bellow?
I scan and read code P0301, P0302 and P0303. I replaced all fuel injector (bought ebay), ignition coils, wires and spark plug, but problem still there.
could anyone give any advice? thank you
HL

Originally Posted by Hlmyd2002

Thank you for your input
here is parts I bought from amazon and ebay.

NGK RC-TE66 Spark Plug Wire Set (wire)
T100-3.4L V6 fit 90919-02212 C1041 UF156 UF-156 (coil)
spark plug ( BKR5EGP)
and fuel injector I bought from ebay, which is re-manufacturing).

I have not done compression test yet.

Thank you
HL