|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
1-Step & 2-Step Colder Plugs
|
|
05-21-2019, 10:19 AM | #1 |
Private First Class
73
Rep 135
Posts |
1-Step & 2-Step Colder Plugs
2008 N54 AWD 140k miles
DCI Catless DP Stage 2 MHD tuned (stock intercooler) On cold start in the mornings before work, my idle is funky. Car starts normally and does cold start high idle normally for ~7 seconds then the idle fluctuates uppppppp like 3-400 RPMs and thennnnn droppppps back downnnnnn to 800 then a few seconds more drops down again to standard idle of 650 and stumbles and rumbles and misfires. Then I tap the gas a couple times and it all evens out. This had NEVER happened until the MORNING AFTER I installed my catless DPs. Didn't touch plugs, coils, or fueling in any way shape or form. Plugs are standard non-iridium tipped Bosch with 10k miles on them and coils are standard OE Delphi with 10k miles on them. Injectors are probably factory. Most likely not index 12. I thought maybe because I'm missing the downstream O2 sensors now, maybe the car is just acting funky because of the Service Engine Soon light. So I tuned MHD and coded out the O2 sensor light. Nope. Still misfiring on cold start. I understand colder plugs and their function and I understand why they're necessary for higher boost applications but I don't understand why they'd be needed for a cold start idle. Do I miraculously have leaky injectors the day after installing DPs/tune and the misfire isn't related at all to the DPs or the tune? Just ridiculous. One thing after another. PS: BMS says "Note: these plugs are on national back order. Most still floating around the internet are counterfeit. We suggest the NGK 2-STEP plugs as an alternative for all tuned BMW applications." I doubt with simple bolt ons I should be running 2 step colder plugs? Does anyone do this? |
05-22-2019, 12:19 AM | #2 | |
Brigadier General
2896
Rep 3,726
Posts |
Quote:
I run 97506s and they work great.
__________________
2017 F80 M3 ZCP / AA GESI DPs / Akrapovic Evo / BBS FI-R 19" / Bend Calibration ECUTEK Flex Fuel | Bilstein B16 DDC + CS EDC / BMC Filters / BMS OCC / CSF HE / ESS CP / Nitto NT555R2 / PD Crank Hub / SPL Suspension / Uniden R7 / Wagner Top Mount IC
2021 Mini GP3 / BMC Filters / BM3 / Cary Jordan E30 / Wagner IC / Remus Race |
|
Appreciate
0
|
05-23-2019, 08:59 AM | #3 | |
Private First Class
73
Rep 135
Posts |
Quote:
I notice in your signature you're gapped to .028 which is way wider than I've heard of for tuned N54s. Maybe your larger gap is accommodating the overly cold plugs? |
|
Appreciate
0
|
05-23-2019, 09:10 AM | #4 |
Major General
2655
Rep 6,285
Posts |
I am FBO on Stage2+ 93 Octane and using factory Bosch plugs and all is good.
Maybe you're plugs are just more used and it's coincidental. I was doing like -2.7 corrections but when I put in brand new Bosch plugs and coils my car runs like new. Or maybe injectors... a lot of variables here IMO. |
Appreciate
0
|
05-23-2019, 09:46 AM | #5 | ||
Brigadier General
2896
Rep 3,726
Posts |
Quote:
__________________
2017 F80 M3 ZCP / AA GESI DPs / Akrapovic Evo / BBS FI-R 19" / Bend Calibration ECUTEK Flex Fuel | Bilstein B16 DDC + CS EDC / BMC Filters / BMS OCC / CSF HE / ESS CP / Nitto NT555R2 / PD Crank Hub / SPL Suspension / Uniden R7 / Wagner Top Mount IC
2021 Mini GP3 / BMC Filters / BM3 / Cary Jordan E30 / Wagner IC / Remus Race |
||
Appreciate
0
|
05-23-2019, 10:41 AM | #6 |
Private First Class
73
Rep 135
Posts |
|
Appreciate
0
|
05-23-2019, 10:44 AM | #7 | |
Private First Class
73
Rep 135
Posts |
Quote:
|
|
Appreciate
0
|
05-23-2019, 11:17 AM | #8 | |
Major General
2655
Rep 6,285
Posts |
Quote:
I did a post asking if I really needed 1 step colder and people reassured me no. I even ran a E30 e85 mix map and no missfires or anything. All good. So idk if step colder plugs are really needed on factory turbos... I don't want to spread misinformation but this is what I seem to notice. |
|
Appreciate
0
|
05-23-2019, 11:52 AM | #9 | |
Private First Class
73
Rep 135
Posts |
Quote:
|
|
Appreciate
0
|
Bookmarks |
|
|