High RPM Sputtering/Misfire

daonlyillwiz · 04-22-2017, 01:46 PM

Why would the car sputter and misfire @ a high RPM in 3rd, 4th gear 6200rpm and up w/ the exhaust valve open and not when its closed.

Mods:
JB4 w/ wastegate and fuel mass connected
VRSF downpipes
BMS Intakes
BMS Charge pipes
Remus Race exhaust (unresonated)

Im currently on MAP 2 full 93 pump gas. I tried a mix of 4gal e85 and rest 93 with the same result on MAP 2 and MAP 7. Does anybody have any idea why this would be happening?

s2k750 · 04-22-2017, 05:31 PM

Quote:

Originally Posted by daonlyillwiz

Why would the car sputter and misfire @ a high RPM in 3rd, 4th gear 6200rpm and up w/ the exhaust valve open and not when its closed.

Mods:
JB4 w/ wastegate and fuel mass connected
VRSF downpipes
BMS Intakes
BMS Charge pipes
Remus Race exhaust (unresonated)

Im currently on MAP 2 full 93 pump gas. I tried a mix of 4gal e85 and rest 93 with the same result on MAP 2 and MAP 7. Does anybody have any idea why this would be happening?

How old are your plugs? gap? Has anything changed since this started? Have you tried map 1?

daonlyillwiz · 04-23-2017, 11:47 AM

Quote:

Originally Posted by s2k750

How old are your plugs? gap? Has anything changed since this started? Have you tried map 1?

Car corrected itself. I switched to MAP 3 did a few part throttle pulls in 3rd and 4th then switched it back to MAP 2 and that solved the problem.

Plugs are 8k miles old factory gap.

schnell325 · 04-23-2017, 12:04 PM

It's your plugs and or plug gap.

daonlyillwiz · 04-23-2017, 06:24 PM

Quote:

Originally Posted by schnell325

It's your plugs and or plug gap.

Yep, i took them out today and checked...they were a bit out of spec. I regapped them to .26 to be safe and threw them back in.

Rbezy · 04-24-2017, 01:42 PM

i have the same issue and pretty much same setup. Ill check my plugs too

hakcar · 04-24-2017, 02:23 PM

Same, but Dinan Stg3 (also open exhaust, more open intake, but 91oct in CA).

Happened to me on track on two separate days, only in 3rd gear near redline (2nd never exhibited the same problem, no straights long enough for top of 4th).

Haven't checked my plugs yet but I'll be sure to do so as soon as I'm able.

daonlyillwiz · 04-25-2017, 08:37 AM

Yea guys, definitely check the plugs...if the gap is too big the spark is getting blown out so you need to make it smaller. Stock gap is .28 i dropped mine to .26. I asked around locally and some people ar running .20-.22 but im not sure if i want to go that low..

CaryTheLabelGuy · 04-25-2017, 10:00 AM

Quote:

Originally Posted by daonlyillwiz

Yea guys, definitely check the plugs...if the gap is too big the spark is getting blown out so you need to make it smaller. Stock gap is .28 i dropped mine to .26. I asked around locally and some people ar running .20-.22 but im not sure if i want to go that low..

What is your setup? Gap depends greatly on setup/power levels.

CaryTheLabelGuy · 04-25-2017, 10:10 AM

Do any of you guys currently experiencing misfires have ISTA/D?

If so, I have an experiment for you.

FSociety · 04-25-2017, 12:02 PM

Quote:

Originally Posted by CaryTheLabelGuy

Do any of you guys currently experiencing misfires have ISTA/D?

If so, I have an experiment for you.

Pls share so I can ask someone to test

daonlyillwiz · 04-25-2017, 01:03 PM

Quote:

Originally Posted by CaryTheLabelGuy

Do any of you guys currently experiencing misfires have ISTA/D?

If so, I have an experiment for you.

What is an ISTA/D ?

As for the boost, im running MAP 2 and ocassionally MAP 7 when i go to "Mexico"

hakcar · 04-25-2017, 09:58 PM

Quote:

Originally Posted by CaryTheLabelGuy

Do any of you guys currently experiencing misfires have ISTA/D?

If so, I have an experiment for you.

Yes. Always happy to test.

CaryTheLabelGuy · 04-26-2017, 08:13 AM

Quote:

Originally Posted by hakcar

Yes. Always happy to test.

If you have ISTA/D, do a complete vehicle test with identification and allow the test to run. Once the test is done, notate any codes and write them down, then clear all codes. Then go to Service Procedure and go to Powertrain, then DME and then click on adaptations. Follow the procedure to reset all DME adaptations and then close ISTA/D when you're done.

See if this helps your misfires.

hakcar · 04-26-2017, 09:07 AM

Quote:

Originally Posted by CaryTheLabelGuy

If you have ISTA/D, do a complete vehicle test with identification and allow the test to run. Once the test is done, notate any codes and write them down, then clear all codes. Then go to Service Procedure and go to Powertrain, then DME and then click on adaptations. Follow the procedure to reset all DME adaptations and then close ISTA/D when you're done.

See if this helps your misfires.

Did that the first track day I noticed this on, a couple months back. It did help for a short time but the problem came back after a few laps.

CaryTheLabelGuy · 04-26-2017, 01:42 PM

Quote:

Originally Posted by hakcar

Did that the first track day I noticed this on, a couple months back. It did help for a short time but the problem came back after a few laps.

What is your setup? Have you tried a fresh set of gapped-down plugs? Where is the misfire happening? Are you getting an associated CEL/Drivetrain Malfunction?

hakcar · 04-26-2017, 02:39 PM

Quote:

Originally Posted by CaryTheLabelGuy

What is your setup? Have you tried a fresh set of gapped-down plugs? Where is the misfire happening? Are you getting an associated CEL/Drivetrain Malfunction?

Quote:

Originally Posted by hakcar

Same, but Dinan Stg3 (also open exhaust, more open intake, but 91oct in CA).

Happened to me on track on two separate days, only in 3rd gear near redline (2nd never exhibited the same problem, no straights long enough for top of 4th).

Haven't checked my plugs yet but I'll be sure to do so as soon as I'm able.

Haven't tried new plugs and also haven't checked my own; hopefully I'll be able to do so sometime in the near future.

OE intake minus charcoal liner plus drop-in filters, open exhaust (ER+AA+Dinan front-to-back), and Dinan Stage 3.

Misfires at top of 3rd, never occurs at top of 2nd, no straights long enough to see if it also occurs at top of 4th.

No drivetrain malfunction, although IIRC, I did get misfire codes (read with ISTA prior to adaptations reset) for two cylinders.

I don't take RPMs too high in 3rd off-track since I don't live in Mexico.

MPOOR · 01-17-2018, 10:40 AM

Quote:

Originally Posted by hakcar

Haven't tried new plugs and also haven't checked my own; hopefully I'll be able to do so sometime in the near future.

OE intake minus charcoal liner plus drop-in filters, open exhaust (ER+AA+Dinan front-to-back), and Dinan Stage 3.

Misfires at top of 3rd, never occurs at top of 2nd, no straights long enough to see if it also occurs at top of 4th.

No drivetrain malfunction, although IIRC, I did get misfire codes (read with ISTA prior to adaptations reset) for two cylinders.

I don't take RPMs too high in 3rd off-track since I don't live in Mexico.

Any more news on this symptom??? I went to dyno mine today and experienced similar

symptom. It will not run all the way to the Redline. Sputters around 65k

range.

kerm1t · 01-17-2018, 11:32 AM

If any of the ign hits 0 does that mean misfire?

daonlyillwiz · 01-17-2018, 11:41 AM

Quote:

Originally Posted by kerm1t

If any of the ign hits 0 does that mean misfire?

yes

kerm1t · 01-19-2018, 06:42 PM

Quote:

Originally Posted by daonlyillwiz

yes

is this only on full throttle are or is it bad even on cruising too?

on full thorttle it never hits 0, but in city driving, i would see a little delay in plugs 5/6 after shifts

04-22-2017, 01:46 PM	#1
daonlyillwiz Lieutenant 110 Rep 478 Posts Drives: 2018 BMW M5 Join Date: Jun 2015 Location: NY iTrader: (3)	High RPM Sputtering/Misfire Why would the car sputter and misfire @ a high RPM in 3rd, 4th gear 6200rpm and up w/ the exhaust valve open and not when its closed. Mods: JB4 w/ wastegate and fuel mass connected VRSF downpipes BMS Intakes BMS Charge pipes Remus Race exhaust (unresonated) Im currently on MAP 2 full 93 pump gas. I tried a mix of 4gal e85 and rest 93 with the same result on MAP 2 and MAP 7. Does anybody have any idea why this would be happening?
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04-23-2017, 12:04 PM	#4
schnell325 Bored at work.... 890 Rep 5,391 Posts Drives: 2016 F82 M4 GTS//2022 M235iGC Join Date: Aug 2007 Location: Comox Valley iTrader: (8)	It's your plugs and or plug gap. __________________ Grey Matter:2008 E92 M3:608/425. SG/PS SOLD! Dark Matter:2015 F80 M3:495/505. SOLD! Anti Matter :2016 F82 M4 GTS What next?!? A 2022 M235i GC- I must be getting old
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04-24-2017, 01:42 PM	#6
Rbezy Second Lieutenant 55 Rep 213 Posts Drives: 2015 BMW M4 - YMB Join Date: Mar 2016 Location: Los Angeles iTrader: (0)	i have the same issue and pretty much same setup. Ill check my plugs too
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04-24-2017, 02:23 PM	#7
hakcar on hiatus 63 Rep 106 Posts Drives: F82 Join Date: Apr 2017 Location: SF Bay Area iTrader: (0)	Same, but Dinan Stg3 (also open exhaust, more open intake, but 91oct in CA). Happened to me on track on two separate days, only in 3rd gear near redline (2nd never exhibited the same problem, no straights long enough for top of 4th). Haven't checked my plugs yet but I'll be sure to do so as soon as I'm able.
	Appreciate 0 Quote

04-25-2017, 08:37 AM	#8
daonlyillwiz Lieutenant 110 Rep 478 Posts Drives: 2018 BMW M5 Join Date: Jun 2015 Location: NY iTrader: (3)	Yea guys, definitely check the plugs...if the gap is too big the spark is getting blown out so you need to make it smaller. Stock gap is .28 i dropped mine to .26. I asked around locally and some people ar running .20-.22 but im not sure if i want to go that low..
	Appreciate 0 Quote

04-25-2017, 10:10 AM	#10
CaryTheLabelGuy Colonel 2634 Rep 2,809 Posts Drives: 2016 M4 ZCP Join Date: Mar 2015 Location: Jacksonville, FL iTrader: (0)	Do any of you guys currently experiencing misfires have ISTA/D? If so, I have an experiment for you.
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01-17-2018, 11:32 AM	#19
kerm1t Captain 169 Rep 926 Posts Drives: 17 M3 ZCP Stage 2 Join Date: Jul 2013 Location: San Francisco iTrader: (0)	If any of the ign hits 0 does that mean misfire?
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