NGK 97596 Idle Issues

[Izzmeister]

Hi guys, I know this has been discussed on here but none of the threads solve the issue. 2015 F80 with a bm3 stage 2 93 octane OTS tune. Inly kn drop-ins and catless downpipes, still have cats before muffler dct car. 38k miles now and never had plugs replaced. Didn't have any issues with stock plugs but read that it's time for a plug change. So I changed them for ngk 97506 as suggested. I gapped them to .22 as suggested by bm3. The car runs great and is smoother but at idle it jolts. Feels like a misfire just at idle, every 20-30 seconds. It's annoying, is it because the gap is smaller? I'm tempted to put my stock plugs back in at stock gap. Should I gap the ngk wider like .25? Anybody else have this issue? I hate the jolt, makes me anticipate it at every light. I was getting away with the stock plugs so far. Could I just but a set of stockers and install at stock gap? Your help is much appreciated, don't know why on everyone hoes with a colder plug at such a small gap compared to stock. I never got spark blowout on stockers and I blew the doors off my buddy with the same car just no downpipes and a jb4, a good 2 cars and pulling. Anyhow, any help is appreciated...thanks

[tinpot]

I use the ngk 97506 spark plugs with E85 fuel. Every 3 months I run a full tank of 93. On 93 my car constantly stalls on start with these spark plugs until the car is warmed up. Even when the car is warmed up, idle jolts like you mention. You may want to go back to stock especially since you’re running 93.

[satinghostrider]

I have the jolts on these 97506 plugs and it is normal from many others who have had it on their cars. They eventually become better with more mileage but due to the narrow gapping with these plugs, this is unavoidable. If you want smooth idle, then you have to revert back to the Bosch OEM plugs.

[CAOZKAN]

I reverted back to OEMs not to have these jolts as well.

[TR930]

Do you need 97506 plugs if you are just on 91-93 gas? Assuming stage 2 BM3? I want to install my Pure Stage 2's on pump gas and it looks like it calls for these 97506, but I'm hesitant if it is going create an issue like the description above.

[Izzmeister]

Originally Posted by TR930

Do you need 97506 plugs if you are just on 91-93 gas? Assuming stage 2 BM3? I want to install my Pure Stage 2's on pump gas and it looks like it calls for these 97506, but I'm hesitant if it is going create an issue like the description above.

Originally Posted by TR930

Do you need 97506 plugs if you are just on 91-93 gas? Assuming stage 2 BM3? I want to install my Pure Stage 2's on pump gas and it looks like it calls for these 97506, but I'm hesitant if it is going create an issue like the description above.

Yes I'm on BM3 93 stage 2.

[whitstap]

Also can reset adaptations that helped my car run and idle smoother after I installed the 97506 plugs at .021 gap on bm3 custom 93 tune

[Izzmeister]

Originally Posted by whitstap

Also can reset adaptations that helped my car run and idle smoother after I installed the 97506 plugs at .021 gap on bm3 custom 93 tune

Actually did just that last night, cleared adaptations. Car ran smooth last night and today as well, short drive this morning and it didn't jolt. Maybe once but barely perceptible...will report back.
Thanks!

[CAOZKAN]

Originally Posted by Izzmeister

Actually did just that last night, cleared adaptations. Car ran smooth last night and today as well, short drive this morning and it didn't jolt. Maybe once but barely perceptible...will report back.
Thanks!

It happens to me exactly the same way. When I reset adaptations, it goes jolt free for a small while then it starts jolting again.

[Izzmeister]

Originally Posted by CAOZKAN

It happens to me exactly the same way. When I reset adaptations, it goes jolt free for a small while then it starts jolting again.

Yep, jolting again now. Going back to stock plugs, didn't have issues before

[Izzmeister]

Has anyone tried these same plugs but at factory plug gap? Say .28 or a little more? Maybe that will take care of it. I never had any issues with the old plugs and the tune, they looked good when I pulled them out. Just replaced as a maintenance item, they're good for much longer than 30k miles though. I don't think these cars really need colder plugs gapped so aggressively for a stage 2 on 93 pump gas.

[TR930]

Originally Posted by Izzmeister

Has anyone tried these same plugs but at factory plug gap? Say .28 or a little more? Maybe that will take care of it. I never had any issues with the old plugs and the tune, they looked good when I pulled them out. Just replaced as a maintenance item, they're good for much longer than 30k miles though. I don't think these cars really need colder plugs gapped so aggressively for a stage 2 on 93 pump gas.

I run the BM3 Stage 2 tune on stock plugs and have zero idle issues. What I'm worried about is going to Pure Stage 2 in the Colder plugs. I don't need any issues with idle then.

[rborane]

Originally Posted by Izzmeister

Has anyone tried these same plugs but at factory plug gap? Say .28 or a little more? Maybe that will take care of it. I never had any issues with the old plugs and the tune, they looked good when I pulled them out. Just replaced as a maintenance item, they're good for much longer than 30k miles though. I don't think these cars really need colder plugs gapped so aggressively for a stage 2 on 93 pump gas.

Just stick with the factory plugs. No need to change at your levels.

[CAOZKAN]

Originally Posted by Izzmeister

Has anyone tried these same plugs but at factory plug gap? Say .28 or a little more? Maybe that will take care of it. I never had any issues with the old plugs and the tune, they looked good when I pulled them out. Just replaced as a maintenance item, they're good for much longer than 30k miles though. I don't think these cars really need colder plugs gapped so aggressively for a stage 2 on 93 pump gas.

I tried this way too, unfortunately it didn't help...

[Izzmeister]

Originally Posted by RoadRunner///M

I have run the BM3 S2 93 with a the NGK gapped at 0.02. Smooth idle and no issues. I now run S1 93 and also no issues. Car has 20k

Originally Posted by RoadRunner///M

I have run the BM3 S2 93 with a the NGK gapped at 0.02. Smooth idle and no issues. I now run S1 93 and also no issues. Car has 20k

At .20 you mean?
The car feels faster and the exhaust is a little louder, more aggressive sounding if that makes sense. I have Evolution Raceworks catless downpipes with a complete mpe titanium exhaust - or whatever it's made of off a cp M4. After driving the car spiritedly it idles like it's not even on. However it will start to jolt a few times at a light. Counted 4 times in a 40 second span. If I gap them smaller I think it will get worse. It's also smellier exhaust, maybe it's not burning all the fuel in the cylinder. Going to stocks this weekend, hopefully it runs well. I'll report back here, the mpe exhaust has the cats still and the factory resonator.

[terahertz]

Originally Posted by Izzmeister

At .20 you mean?
The car feels faster and the exhaust is a little louder, more aggressive sounding if that makes sense. I have Evolution Raceworks catless downpipes with a complete mpe titanium exhaust - or whatever it's made of off a cp M4. After driving the car spiritedly it idles like it's not even on. However it will start to jolt a few times at a light. Counted 4 times in a 40 second span. If I gap them smaller I think it will get worse. It's also smellier exhaust, maybe it's not burning all the fuel in the cylinder. Going to stocks this weekend, hopefully it runs well. I'll report back here, the mpe exhaust has the cats still and the factory resonator.

That could be your problem. The bootmod3 website says 0.022 and you gapped it at 0.20?

https://bootmod3.atlassian.net/wiki/...+and+which+gap

[Izzmeister]

Originally Posted by terahertz

That could be your problem. The bootmod3 website says 0.022 and you gapped it at 0.20?

https://bootmod3.atlassian.net/wiki/...+and+which+gap

No, I gapped them at .22 just asking if his were gapped to .20

[terahertz]

Originally Posted by Izzmeister

No, I gapped them at .22 just asking if his were gapped to .20

You're missing a 0 there was my point.

[Izzmeister]

Originally Posted by terahertz

You're missing a 0 there was my point.

Originally Posted by terahertz

You're missing a 0 there was my point.

Got it, gapped at .022
Let's see how she runs with stick plugs at stock gap this weekend. It's a shame because these plugs really make the car feel more powerful and responsive. What's the stock gap and do they come pre-gapped? Got part number BMW 12-12-0-039-634 plugs.

[andrei.m4]

Oem plugs came gapped 0.028 if i remember corectly, someone tried 0.027-0.028 gap at ngk? I have same ‘shaky’ idle with ngk at 0.022.
Bm3 stage2 agg 93oct stock turbos.

[Trevorstein]

Sub'd.




Cheers!

[CAOZKAN]

Mine does that both stg1&2 with PureTurbos but I don't think it has anything to do with turbos or stages. I'm also thinking maybe NGKs were fake ones since there are a lot fake ones in the market...