I've ran into this problem where I find myself changing my spark plugs about every week due to bad backfiring under boost. Every time I change my plugs the backfiring goes away so I'm fairly certain something is causing my plugs to go bad prematurely. I'm using BPR8ES but after reading I might switch to the BR8ES. Mods are in sig, running 36psi and E85. Anyone else have and fixed this problem?

 

Oh yeah, I also read that switching to a warmer plug like the BR7ES could help too due to the heat qualities of E85. Please help.

 

I'm about to change my plugs again. I'm not sure what the plugs are gaped to right now so I'll check that. Letting car cool down first.

 

If you aren't gapping them then that's probably the issue, they're pretty open out of the box. Among other things the colder plugs don't clean themselves off very well which makes them foul out more easily so you'll be replacing them a lot either way. If you trounce the car every time you get in it you can blow through a set of them really fast too.

 

As mentioned by silvertune---there is no such thing as a pregapped plug and based on your string of entries is exactly the problem. There is plenty on this forum for what to gap too-- excellent info above as well. Good Luck.

 

a 7es would be a colder plug. and as stated, gap them. start with .022 then if that doesnt cut it work your way down. try not to go below .018 tho.... mine have to be right at .018 with 42psi and e85 and i run a 8ES

 

Wrong A 7 is one step hotter then an 8 in the NGK line.

 

When I took my old plugs out they were obviously not gaped. I gaped the new ones to .022. The car still feels like I'm driving in a mechanical bull. I don't know what fuel cut or boost cut feel like but I imagine that is what my car is doing and the popping/backfire is still present.

After owning this car for 5 years I feel like pushing if off a cliff sometimes.

 

I agree with Roadrunr a 7 is a step hotter.

 

Can you get a video of what it's doing so we can try to help?

 

sorry my bad boys! you guys are correct, idk why i was thinking opposite

 

I've run into the same issue lately. Gone through three sets of plugs, was tuned with BR8EIX's changed those out when car would want to stall out and traced down a bunch of issues then had tune adjust and fixed stalling issue. Brand new plugs would last maybe a week and last set lasted a day. Currently have some autozone NGK IGR7A-G's in and car ran decently. Waiting to take car back in to have fuel trims adjusted since it runs rich from idle til boost.

 

To my knowledge the 7 is "1 step" colder than stock plugs. The 8 is "2steps" colder

 

NO No No, Colder=10,9,8,7,6,5,4=Hotter in the NGK line.

Don

 

Try gap of .022 and then .020 and then .018"

If the gaps are good, then the coils might be weak, and/or you're too rich