DanStew

Diring the truck today and noticed at 2000+ RPMs the truck is bucking and has a bad misfire. I got it home and pulled the plugs. all the plugs were fouled and had the electrodes covered with white deposits. Looknig at the handy dandy chilton plug chart it seems the plugs have been exposed to higher tempuratues. Which i do understans cause I have had pinging issues with the heat and i had the temp go a little high because of low antifreeze. I am currently running NGK BPR5EY plugs. I was wondering if i went cooler how th etruck will react? A mechanic friend of mine who races acuras suggested to goto the BPR6EY plug. Would a cooler plug be any benefit? Bottom line i do need plugs so i will get them in one flavor of another.

xxxtreme22r

what do you run for a plug gap? how many miles on the motor. 22r(re) correct? those are the same plugs I am running NGK v-powers right?

Pinging issues can be caused by too far advanced timing and also carbon buildup on the piston which actually leads to a higher compression ratio in the motor. As well as some other I am sure, but those two come to the top of my head because they are the most common on higher mileage motors. Vacuum leaks, failing fuel pump/regulator, knock sensor also comes to mind as well.

Running a cooler plug because of pinging on a stock motor is just masking and band aiding an existing problem. The only reason why I have ever run colder plugs is on high compression motors or nitrous/forced induction motors. Which is probably why your import racing buddy suggested doing the colder plug. General rule of thumb and I say very general, is for about every 50HP added to the factory output of a motor you run 1 step colder.

DanStew

I rebuilt the motor 2 years ago. the plugs were new when i got it. I thoguht i had plain jane plugs but looking at those numbers it is the v power. Its has been a while since i ordered them so i have no anser to why i ended with them. The timing is set to 4 degrees and that was set little more than a year ago. I have to wait till the weekend to get my timing light back to check that. The ping is something i have been dealiing with. The next tank of gas i am gonig to change to mid grade fuel to see how it affects it. When it isnt summer the truck runs without pinging. I Have some suspicion with my EGR valve but i havent checked it yet. My issue with that is a rough idle, i believe it is sticking open at idle. Back to the plugs. Looknig on NGK site. the 5 series plug is hotter. THe 6 is supposed to be normal. So i guess i wont be gonig any "cooler" per se, just putting it back into normal temp range.

PRetty interesting reading.
http://www.ngk.com/charglossary.asp?kw=Heat+range

xxxtreme22r

let me go check maybe your right its the 5 stock 6 colder.

edit 1, would you know it, i threw out my old plugs/box two weekends ago. dang it.

Not sure if a colder that normal plug would cause pinging or not, I would be inclined to say no, however, I believe a colder than necc plug will have the tendency to foul out causing it not to spark.

edit 2: checked the advance auto site, BPR5EY would be the correct heat range/application. for both the 22r and 22re

myyota

The timing should be set at 5 degrees. Have you ever replaced the 02 sensor ?, if its bad it could cause the lean condition (pining) that your getting.

DanStew

yeah the o2 sensor is something i want to change but havnt done it. I do have suspicions on the sensor being 190K.

tried4x2signN

No, only need a colder plug if the compression is greatly raised.

SoCal4Running

2 years is quite a while for plugs in one of these motors rebuilt or not.

I run K16TR-11 plugs which are for like a 99 4runner, they are stock Denso plugs with a double sided ground and are under $3.00 each. Cheap enough to change out every year but dont cost what the others do. (pic of plugs on this link https://www.yotatech.com/forums/f120...rd-gen-195676/ about half way down.)

Could also restrict the EGR down to about a 1/8th inch opening where it enter the rear of the plenum. Stock it is about a 3/8th inch opening which is a little LARGE for a small 4 banger. My trucks run a lot smoother with the smaller opening.

DanStew

Well I got the new NGKs in . I did use the 6 series, so it is a little cooler. I do not see a real differnce yet. Ping may have been reduced but i still have it, so i will go after that later, my main concern is getting the truck running again. So what is the life span for a set of plugs? For some reason i was thinking i would get more than what i ahve in the truck about 30K. But they are new and the truck runs. Thanks!!

xxxtreme22r

I try to change my plugs twice a year regardless of mileage, but that's me.

SoCal4Running

Ditto, doing it often also makes sure the anti-seize stays fresh and still does its anti-seizing job. I hate stuck plugs and Helicoils.