I am running Buschur built 2L with FP Black right now on my evo with 100k miles

I started getting P300 code recently. I figured it was the spark plugs.
NGK BPR8ES is what i ran.
I then put in another set of NGK BPR8ES only this time it was made by autolite. Now the car is running better but still misfires here and there.... But ONLY IN BOOST

First of all, is it due to the spark plug?
or is there something else i should check? coil packs maybe?

Stock coilpacks and wires
1000cc injectors

any comments would be appreciated

 

In my Evo VIII, I run NGKBR8ES. These plugs are shorter and are therefore a cooler plug. They work very well.

The P0300 is a known issue on some ROM's, especially if you are running aftermarket cams. I would just disable the code. Check out this thread: https://www.evolutionm.net/forums/ec...0300-test.html


-Bink

 

P0300 is a multiple cylinder misfire. This was actually an issue back in the day with Evo 8s which could be solved in using ECUFlash. With your power, you would probably be fine with BPR7ES (stock) plugs as BPR8ES are a step colder. Give us some more info...What ignition setup are you using, stock coilpacks & wires? Stock plug gap? When was the last time you did a compression test?

 

[QUOTE=bnr34rb26dett;9600984].....I...put in another set of NGK BPR8ES only this time it was made by autolite...[QUOTE]

I am a little confused about the plugs that are currently in your car. How can the plugs be NGK BPR8ES's and be made by Autolite? Or maybe I mean, how can they be NGK's and Autolite's at the same time?

 

So, the chassis has 100K miles on it but the motor is a fresh Buschur rebuild?

 

Do the coils and plug wires have 100K on them?

 

Stock coilpacks stock wires.
gapped at .028 i believe.
compression test was done about a year ago but i had evo 9 turbo back then..


[QUOTE=sparky;9601016][QUOTE=bnr34rb26dett;9600984].....I...put in another set of NGK BPR8ES only this time it was made by autolite...When i went to auto zone they told me autolite makes NGK BPRES (after market company) but now i think about it, it doesnt make sense does it

 

yep
thats exactly what i mean

 

you got lied to, autolite is junk.

 

that might have solved the problem.....
which spark plus should i then go with?
is NGKBR8ES the best option for me?

 

yes,thats what i run in my car,and im nearing the 500hp mark

 

Yes, throw another set of NGK BPR8ES plugs in there & get rid of those Autolite plugs. If you still have a misfire issue, maybe see if someone local to you has a pair of OEM coilpacks & wires that you could throw on your car & try out.

 

As B.J. mentions above, we need to know if you gapped the plugs and if so what the gap is set at? I would stay away from Autolite plugs on my Evo. If you want to stay with a copper plug , then either try the NGK BPR7Es as B.J. suggests, or else I might prefer the BR7ES(note: not BPR7ES).

The BPR7ES is one full heatrange hotter than the the BPR8ES. Whereas the BR7ES is right between the two. It is only a step hotter(half a heatrange) than the BPR8ES, which makes it a step colder(half a heatrange) than the BPR7ES.

If you do mostly sustained high speed highway driving then the BPR8ES should run fine. If however, you do any stop and go city driving, or the engine idles for more than brief periods of time(at traffic lights), then the BPR8ES may have a tendency to foul, or load up.


COLDER BR8ES>BPR8ES>BR7ES>BPR7ES HOTTER

 

ok great thanks

Thanks!
I love ur manifold btw

 

No problem & the manifold looks great on your car!