Cobb to MHD now misfiring

MrForgetful · 04-09-2020, 02:47 AM

So finally got to fitting charge pipe and MHD. Car is now FBO with bigger turbos. Was running Cobb but decided to try mhd for various reasons.

With Cobb, power didn't come on till just after 4k rpm. But it came on strong. I'd get a low pressure code.

Now, with MHD, power much more linear on map 2+. But, misfire in cyl 5. Plugs are quite new, but I think they're standard plugs. Boost doesn't seem to be high enough, was targeting 18.5 but was only just over 17psi. I thought it would target a little higher too?

Should I get new plugs and coils, or just coils?

Socket · 04-09-2020, 03:28 AM

Quote:

Originally Posted by MrForgetful

So finally got to fitting charge pipe and MHD. Car is now FBO with bigger turbos. Was running Cobb but decided to try mhd for various reasons.

With Cobb, power didn't come on till just after 4k rpm. But it came on strong. I'd get a low pressure code.

Now, with MHD, power much more linear on map 2+. But, misfire in cyl 5. Plugs are quite new, but I think they're standard plugs. Boost doesn't seem to be high enough, was targeting 18.5 but was only just over 17psi. I thought it would target a little higher too?

Should I get new plugs and coils, or just coils?

both

Aus335iguy · 04-12-2020, 01:01 AM

Quote:

Originally Posted by Socket

Quote:

Originally Posted by MrForgetful

So finally got to fitting charge pipe and MHD. Car is now FBO with bigger turbos. Was running Cobb but decided to try mhd for various reasons.

With Cobb, power didn't come on till just after 4k rpm. But it came on strong. I'd get a low pressure code.

Now, with MHD, power much more linear on map 2+. But, misfire in cyl 5. Plugs are quite new, but I think they're standard plugs. Boost doesn't seem to be high enough, was targeting 18.5 but was only just over 17psi. I thought it would target a little higher too?

Should I get new plugs and coils, or just coils?

both

Have a look at your plugs. Cyl 5 misfires are the most common
Replace both coils and plugs

MrForgetful · 04-13-2020, 02:40 AM

Cheers guys, have ordered them and will see how we go.

DR-JEKL · 04-13-2020, 07:24 AM

yeah 90% of the time misfires is from coils/plugs.

How old are the coils? the bosch coils dont seem to last too long..

jard · 04-16-2020, 03:26 AM

Quote:

Originally Posted by DR-JEKL

yeah 90% of the time misfires is from coils/plugs.

How old are the coils? the bosch coils dont seem to last too long..

Was considering getting some of the bosch coils, but if this is true maybe not haha.

Socket · 04-16-2020, 04:46 AM

Quote:

Originally Posted by jard

Was considering getting some of the bosch coils, but if this is true maybe not haha.

Not sure but DrJ has been around the N54 engine for a while now

BM3Rrrr · 04-16-2020, 07:51 PM

Quote:

Originally Posted by jard

Was considering getting some of the bosch coils, but if this is true maybe not haha.

If your planning to buy new coils go with Eldor's

IllSic_Design · 04-16-2020, 09:32 PM

Agreed /\, Eldor's are the coil to go.

rooks335 · 04-17-2020, 03:49 AM

When changing the spark plugs don't forget to use de-electric grease on the ceramic part of the spark plugs. Also torque the plugs to 23nm

jard · 04-17-2020, 07:17 AM

Quote:

Originally Posted by BM3Rrrr

If your planning to buy new coils go with Eldor's

I am looking for somewhere to get Eldor coils in Aus but im struggling to find many, any chance for a hint of where to look? I have come across Delphi coils on my search so far.

BM3Rrrr · 04-19-2020, 08:24 PM

Quote:

Originally Posted by jard

I am looking for somewhere to get Eldor coils in Aus but im struggling to find many, any chance for a hint of where to look? I have come across Delphi coils on my search so far.

Did you try clickable automotive?
They might not list them on their website but you can email them.
They are great and can get most things in stock for you if you ask.

jard · 04-19-2020, 08:27 PM

Quote:

Originally Posted by BM3Rrrr

Did you try clickable automotive?
They might not list them on their website but you can email them.
They are great and can get most things in stock for you if you ask.

Yeah, that's where I have been looking - might try get a set of the Bosch ones from them as a few have mentioned them as well.

MrForgetful · 04-21-2020, 06:22 PM

Quote:

Originally Posted by jard

I am looking for somewhere to get Eldor coils in Aus but im struggling to find many, any chance for a hint of where to look? I have come across Delphi coils on my search so far.

I've ordered mine from the USA via ebay. Even with the horrid exchange rate pricing isn't so bad.

jard · 04-22-2020, 07:25 PM

Quote:

Originally Posted by MrForgetful

I've ordered mine from the USA via ebay. Even with the horrid exchange rate pricing isn't so bad.

I'm interested to see how you go with them! What was the price if you don't mind me asking after the exchange?

BM3Rrrr · 04-22-2020, 07:45 PM

Quote:

Originally Posted by jard

Yeah, that's where I have been looking - might try get a set of the Bosch ones from them as a few have mentioned them as well.

Out of the three options (Bosch, Delphi, Eldor) they are the worst. If your going to buy a new set i would just go for Eldor's and be done with it.

MrForgetful · 05-01-2020, 05:48 AM

Quote:

Originally Posted by jard

I'm interested to see how you go with them! What was the price if you don't mind me asking after the exchange?

I think $350? It was $206USD shipped.

MrForgetful · 05-06-2020, 10:21 PM

So installed the new coils today and just did a quick run and no misfire so far so good!

04-09-2020, 02:47 AM	#1
MrForgetful New Member 2 Rep 16 Posts Drives: e90 335i Join Date: Nov 2019 Location: Brisbane iTrader: (0)	Cobb to MHD now misfiring So finally got to fitting charge pipe and MHD. Car is now FBO with bigger turbos. Was running Cobb but decided to try mhd for various reasons. With Cobb, power didn't come on till just after 4k rpm. But it came on strong. I'd get a low pressure code. Now, with MHD, power much more linear on map 2+. But, misfire in cyl 5. Plugs are quite new, but I think they're standard plugs. Boost doesn't seem to be high enough, was targeting 18.5 but was only just over 17psi. I thought it would target a little higher too? Should I get new plugs and coils, or just coils?
	Appreciate 0 Tweet Quote

04-13-2020, 02:40 AM	#4
MrForgetful New Member 2 Rep 16 Posts Drives: e90 335i Join Date: Nov 2019 Location: Brisbane iTrader: (0)	Cheers guys, have ordered them and will see how we go.
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04-13-2020, 07:24 AM	#5
DR-JEKL Major General 909 Rep 6,285 Posts Drives: Space Grey E92 335i 6MT Join Date: Jul 2012 Location: Newcastle Ozstraylia iTrader: (3)	yeah 90% of the time misfires is from coils/plugs. How old are the coils? the bosch coils dont seem to last too long..
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04-16-2020, 09:32 PM	#9
IllSic_Design Colonel 2125 Rep 2,759 Posts Drives: 12 E92 328i Join Date: Jun 2016 Location: Northern California iTrader: (1)	Agreed /\, Eldor's are the coil to go.
	Appreciate 1 jard35.50 Quote

04-17-2020, 03:49 AM	#10
rooks335 Second Lieutenant 44 Rep 249 Posts Drives: 2008 E90 335i Join Date: Jul 2015 Location: Perth WA iTrader: (0)	When changing the spark plugs don't forget to use de-electric grease on the ceramic part of the spark plugs. Also torque the plugs to 23nm
	Appreciate 0 Quote

05-06-2020, 10:21 PM	#18
MrForgetful New Member 2 Rep 16 Posts Drives: e90 335i Join Date: Nov 2019 Location: Brisbane iTrader: (0)	So installed the new coils today and just did a quick run and no misfire so far so good!
	Appreciate 1 jard35.50 Quote