#2 Misfire - P0302

[johnsIslander]

No PO302 anymore but P0171 again and now PO133. I've O2 sensors on order. AND I'm at Fred Anderson now looking at 2017 4Runners.

 

[gamefreakgc]

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/design_symbols_plugs.pdf

I noticed they were not DENSO's but NGK's, they do have an equivalent. But you're right, a single ground platinum wouldn't make much sense. Heck, both DENSO and NGK sell dual-ground platinums, no idea why the previous owner didn't put those in.

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.

 

[fourfive]

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.

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.

 

[gamefreakgc]

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.

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.

 

[fourfive]

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.

Thanks for the tip. I'm glad the tap I was occasionally hearing with hard acceleration is gone after doing some maintenance work but would have been nice to find out what was causing it for future reference.

 

[Hlmyd2002]

4runer 2002 missfire

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

 

[spartacus]

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

What brand injectors, spark plugs and wires did you buy from ebay? Did you have the same codes before you replaced parts?. Did your motor ever overheat? Eliminate that there are no vacuum leaks, fuel pressure is good, ignitor is good? Do a compression test on the cylinders to eliminate the head gasket or cracked cylinder head.

 

[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

 

[spartacus]

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

Is that a single electrode spark plug or dual electrode? Even though it might not be the cause of misfire but Toyota recommends dual electrode.

 

[spartacus]

Misfires aré sometimes tough one to diagnose. 180k are not a lot of miles for these engines.Make sure the motor is sound first by checking compression if the cylinder are within 10% of each other. check the fuel trim with the obd at operating temps anything +5% could indicate a vacuum leak. check the maf sensor if it is within spec clean it regardless. check the timing marks on the belt by removing the cover to eliminate that the timing belt has not jumped a tooth. eliminate the coil packs by testing them or play musical chairs with them and see if the misfires jump. Its better to figure out what the problem is before throwing parts at it. There are a lot of things to eliminate. If you feel you can trouble shoot it yourself then go right ahead but keep in mind sometimes a good mechanic can diagnose it for you. Caveat being a good shop or a good mechanic are rare, they aré out there just really have to look.