Plugs (95770 v. 97506), gaps, and the N54
- Thread starter fmorelli
- Start date
Yep. I think those aluminum crush washers are use once. In fact, honestly, we all know they are use once. There is no doubt about that. Whether the plugs seal up or not is a subjective thing.
Filippo
I am scared to even remove to gap down to .026 from stock s55 and also clean the spark plug well better as I was using a towel dipped in gasoline wrapped on an extension and couldnt get it perfect. What do you guys think about a dab of permatex on the washer of plug?
Long medical q-tip on a wooden stick would be good. I tried a grab tool and small patch (cloth or blue paper towel) soaked in carb cleaner. I sprayed a bit of carb cleaner down and let it sit. Gentle scrape with a carburetor (long) screwdriver helped with the hard bits. It was literally carbon build up for me. No valve cover oil leak as it was only at the base. I'll inspect from here forward now that I know it is clean. The 97506 have a copper washer that is not the same aluminum construction of the 95770. But I have not switched ... yet.
Filippo
Filippo
Is it misfiring? I wouldn't put anything in that well that isn't supposed to be there. If it can't stand the heat over time and any detaches, it's going right in the cyl the next time you pull the plug.
+1. S55 plugs are also a solid washer, not the double-walled type like the 95770s.
No misfire but everyone recommending smaller gap and a few plugs had filthy washer all dry but that scares me. I did feel slight catching on some threads and one plug was finger tight. I went to 19 lb instead of 17 but almost want to lube the threads to make sure I get proper clamping force. I am too nervous to clean threads and drop stuff into cylinder but this is second time 95770s came loose on me. The car feels more powerful with less pedal but I also feel very slight nvh if accelerating wot from 1500rpm. Like a resonance that causes vibration you hear but barely feel in cabin if don't know if it's the extra torque or if could be partial burn and I should gap down , either way I know I shouldnt floor it off idle but was logging and trying to test for misfires.
Is what I describe normal or should i tighten gap these are s55 at stock gap .031 I verified gap and they came back as a hair tighter than .031.
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What you feel is probably the greater combustion combined with high load, low rpm. That's ripe for super knock like that, so, yes, definitely keep any testing like that to a minimum. You'll have larger flame much quicker in the lean areas with the larger gap.
If it's not misfiring or having other issues, I wouldn't gap them smaller for no reason. Maybe there's something with the aftermarket coils I'm not aware of, but I'd run mine over .040" if I could (never tried). Mine were all closer to .030 than .031 when I checked them new also.
If plugs are working themselves loose to just finger tight over time, definitely not enough torque and may be contributing to stuff collecting on the seats in addition to potential firing problems. I'd err on the side of higher torque and making sure they stay seated rather than getting them within .01Nm of recommended spec. On the solid washers, I always use a torque wrench and I generally dial in an extra 1-2 ft-lbs. For the double wall washers, I do hand tight + 90° turn and never had issues with any ever coming loose on any car.
If it's not misfiring or having other issues, I wouldn't gap them smaller for no reason. Maybe there's something with the aftermarket coils I'm not aware of, but I'd run mine over .040" if I could (never tried). Mine were all closer to .030 than .031 when I checked them new also.
If plugs are working themselves loose to just finger tight over time, definitely not enough torque and may be contributing to stuff collecting on the seats in addition to potential firing problems. I'd err on the side of higher torque and making sure they stay seated rather than getting them within .01Nm of recommended spec. On the solid washers, I always use a torque wrench and I generally dial in an extra 1-2 ft-lbs. For the double wall washers, I do hand tight + 90° turn and never had issues with any ever coming loose on any car.
Now I feel like a noob has anyone experienced minor misfire and not had a code or ses light? On this platform Any time I experienced a misfire I got codes but was always consistent where cylinder shut off. I'm just curious if or when is sensitive to the point where a single misfire event would trigger anything I know I would feel it but I'm wondering about incomplete burn etc.
I haven't the faintest, but I'd take a guess it probably needs to trip to set a code, unless there's a counter for less severe instances and eventually codes on a limit? If there are even minor actual misfires, I would expect to see an out of place AFR during the event whether a code sets or not though.
Thanks I kept searching what misfire looks like on log but only way I ever have actually personally seen is with afr on wot pull I don't think I have ever been able to see it when looking at partial throttle logs its like the emporers new clothes I feel but maybe that's the point that the logs look fine and they are getting misfires?
When I provided the link, it was $20 for a set of 4. I ordered two sets and upon receiving them, there was only two plugs in the package. This also happened to three others buddies. Apparently the company made a mistake in posting them as a set of 4 at the $20, rather than $20 each. They quickly changed the ad to the $84.49 shortly after it was brought to light. They said they will be shipping out the remainder 6 plugs; we will see.
Ecs was 46 bucks for s55 I cant see not using them over 95770. I would either go factory Bosch quad tip or s55 the other plugs all vary in length slightly.
can anyone explain why I'm getting stumbling cold starts with brand new 97506 and eldor coils? i started with a gap of .020 and it actually threw misfire codes during cold start so i closed the gap to .018 and now it just stumbles. other than cold start it runs great ..no misfires up top etc. for testing purposes i threw in my old original coils and bmw plugs and waited to do another cold start test the following morning .... cold start was smooth as butter however it could not handle the N54 FBO PS2 when laying into it and broke up. where is the happy median here..... my 95770 also gave me cold start stumbles.
I don't think I could diagnose anything from remote. When I get misfires or anything weird, I replace suspected parts and it goes away. So now, if I get say a misfire from using .030 NGK plugs, I know it is the plug gap and not anything else...because literally EVERYTHING - from engine to transmission is pretty much new. You name a part, it has been replaced. Yes...I am insane. Yes, even screws, nuts and bolts...new. Walnut blast, stock parts all upgraded like Charge Pipes, etc...
That been said, I return to my previous comment... there's no way to tell what's up without inspecting all related parts to the misfire... could be walnut blast needed to injectors or tune... who knows.
You should list your mods.especially coils. For stock coils I found stock bmw Bosch plugs perfect.
He said his stock old plugs are smooth I would either go new stock plugs or s55 plugs. The 97506 night be to cold for cold start. You could also enable cold start noise reduction and see if that helps
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