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  #1  
Old 07-15-2017, 11:02 AM
cartrhan cartrhan is offline
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Misfires

Flashed an mhd stage 1. I'm seeing random misfires in each cylinder on the mhd monitor. I feel no shutter no power loss hear no knock or anything. If I wasn't monitoring I never even would have suspected it. I'm wondering what could explain this? Also does anyone know how mhd monitors misfires?

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  #2  
Old 07-15-2017, 02:22 PM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Quote:
Originally Posted by cartrhan View Post
Flashed an mhd stage 1. I'm seeing random misfires in each cylinder on the mhd monitor. I feel no shutter no power loss hear no knock or anything. If I wasn't monitoring I never even would have suspected it. I'm wondering what could explain this? Also does anyone know how mhd monitors misfires?

MHD's picking up error codes from the ECU

[here]
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Old 07-15-2017, 02:45 PM
cartrhan cartrhan is offline
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Originally Posted by CALWATERBOY DUE View Post
MHD's picking up error codes from the ECU

[here]
No ****

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Old 07-15-2017, 02:53 PM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Originally Posted by cartrhan View Post
No ****

Y'know, I completely missed you said random misfires.

So. All cyl's, or the same one[s]?

By your response I gotta assume you've done the diagnosis and eliminated plugs, coils; injectors. Also assume you've read codes - post list after deletion + run time.

.

Last edited by CALWATERBOY DUE; 07-15-2017 at 02:54 PM.
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Old 07-15-2017, 03:05 PM
cartrhan cartrhan is offline
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Quote:
Originally Posted by CALWATERBOY DUE View Post
Y'know, I completely missed you said random misfires.

So. All cyl's, or the same one[s]?

By your response I gotta assume you've done the diagnosis and eliminated plugs, coils; injectors. Also assume you've read codes - post list after deletion + run time.

.
I guess I should elaborate. Normal idle no stuttering no power loss and no knocking. Is it even possible I'm misfiring? There is a chance I'm reading the monitor wrong but it says "cylinder misfire" that's pretty obvious. And ya it's in random cylinders.

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Old 07-15-2017, 04:51 PM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Originally Posted by cartrhan View Post
I guess I should elaborate. Normal idle no stuttering no power loss and no knocking. Is it even possible I'm misfiring? There is a chance I'm reading the monitor wrong but it says "cylinder misfire" that's pretty obvious. And ya it's in random cylinders.

Have not had MHD - maybe doesn't read out error codes. If not you'll need a BMW specific reader to see what's going on and one that can delete all codes so they can be current after a drive. Assume no got at the moment, from above.

You might find, for instance, a profile that points to a bad crankshaft position sensor....

Just to nail it down, all six cyl's misfiring intermittantly - that is, some not misfiring, then later are?
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Old 07-15-2017, 04:55 PM
cartrhan cartrhan is offline
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Originally Posted by CALWATERBOY DUE View Post
Have not had MHD - maybe doesn't read out error codes. If not you'll need a BMW specific reader to see what's going on and one that can delete all codes so they can be current after a drive. Assume no got at the moment, from above.

You might find, for instance, a profile that points to a bad crankshaft position sensor....

Just to nail it down, all six cyl's misfiring intermittantly - that is, some not misfiring, then later are?
Ya they aren't then briefly are. Oh I forgot to mention they aren't throwing codes.

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Old 07-15-2017, 05:13 PM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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.

In a N54 I'd look for intake valve fouling....don't see much of that in N55. MHD does have a presence @ E90POST - good place to ask the question.

Have your verified misfires with stock map? Mileage? You did qualify your DME before loading MHD?

.

Last edited by CALWATERBOY DUE; 07-16-2017 at 02:01 AM.
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Old 07-16-2017, 07:47 AM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Originally Posted by cartrhan View Post
Ya they aren't then briefly are. Oh I forgot to mention they aren't throwing codes.

Hold the phone - if no codes, how do you know you have misfires?
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Old 07-16-2017, 08:38 AM
cartrhan cartrhan is offline
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Originally Posted by CALWATERBOY DUE View Post
Hold the phone - if no codes, how do you know you have misfires?
Haha it's confusing I can't really explain

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