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Engine Management Fault Codes #692472
08/03/21 07:59 PM
08/03/21 07:59 PM
Joined: Jun 2019
Posts: 25
B
Barrythebrave Offline OP
Just Getting Started
Barrythebrave  Offline OP
Just Getting Started
B

Joined: Jun 2019
Posts: 25
Hi all
I have the engine management light coming on occasionally and I wondered if anyone can suggest what the problem could be?
Using ProTune accessing Diagnostic Trouble Codes I am having a Fault P0170 and P0173 which is ‘Adaptive Max Limit ‘on both Front and Rear cylinders
It seems that the ECM controls these values and I can’t find any detail of what might be causing these issues.
Any thoughts?

Re: Engine Management Fault Codes [Re: Barrythebrave] #692476
08/03/21 08:05 PM
08/03/21 08:05 PM
Joined: Jul 2013
Posts: 3,171
West Sussex, UK
Chris99 Offline
Talk Morgan Addict
Chris99  Offline
Talk Morgan Addict

Joined: Jul 2013
Posts: 3,171
West Sussex, UK
Probably as a result of drilling out the exhaust baffles the ECU adaptive fuel map is hitting its limit and throwing the fault codes.

The answer is an unlocked ECU - try Garage56 or Krazy Horse.


Red Leader drive
Re: Engine Management Fault Codes [Re: Barrythebrave] #692480
08/03/21 08:26 PM
08/03/21 08:26 PM
Joined: Feb 2018
Posts: 517
SW Iowa, U.S.A.
Bitsobrits Offline
Talk Morgan Regular
Bitsobrits  Offline
Talk Morgan Regular

Joined: Feb 2018
Posts: 517
SW Iowa, U.S.A.
Agreed. Your engine is trying to compensate the fuel ratio and timing to deal with engine operating conditions. So either you have some mods that are allowing the engine to breath better (and hence use more fuel), or if your engine is all standard then it's related to a fault such as an intake or exhaust leak. I believe it can also be related to running a standard engine up to the fuel cutoff point (i.e. red line), though I have no direct experience there.


Steve
2012 M3W



Re: Engine Management Fault Codes [Re: Barrythebrave] #692483
08/03/21 08:34 PM
08/03/21 08:34 PM
Joined: Aug 2009
Posts: 534
Rio Del Mar, CA
kankeL Offline
Talk Morgan Regular
kankeL  Offline
Talk Morgan Regular

Joined: Aug 2009
Posts: 534
Rio Del Mar, CA
Drilling out stock exhaust/no air filter would not result in these error codes. Check intake seals for leaks, and headers for exhaust leaks, also, check your fuel pressure

Last edited by kankeL; 08/03/21 11:01 PM.

2016 M3W, Army Green Matte/Tan Leather, 17k miles
Re: Engine Management Fault Codes [Re: Barrythebrave] #692511
08/03/21 10:57 PM
08/03/21 10:57 PM
Joined: Dec 2017
Posts: 1,114
Evergreen, Colorado, USA
britmog Offline
Has a lot to Say!
britmog  Offline
Has a lot to Say!

Joined: Dec 2017
Posts: 1,114
Evergreen, Colorado, USA
What are you doing just before the engine management light comes on as it is occasional? I agree with KankeL a baffelectomy and air filter would not cause the error codes.


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: Engine Management Fault Codes [Re: Barrythebrave] #692513
08/03/21 11:21 PM
08/03/21 11:21 PM
Joined: Feb 2019
Posts: 3,140
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
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Joined: Feb 2019
Posts: 3,140
Port Orchard, WA.
Mine did not throw codes until I overfilled the gas tank. And finally it threw the Max Limit code with the new cams.

Re: Engine Management Fault Codes [Re: Barrythebrave] #692529
09/03/21 05:05 AM
09/03/21 05:05 AM
Joined: May 2019
Posts: 43
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Bluebricked Offline
Just Getting Started
Bluebricked  Offline
Just Getting Started
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Joined: May 2019
Posts: 43
I chased P0173 ‘Rear Adaptive Max Limit ‘ for the better part of a year on my car. First, those are frustrating codes. The order of areas I would check are: 1) Fuel pressure measured at the schrader valve at the manifold. 2) Air leaks at the intake manifold where it meets the cylinders. 3) Exhaust leaks at the exhaust manifold. 4) C02 Sensors.

If you are getting both codes I have a hard time believing both intake manifold gaskets went south at the same time - unless you recently installed a new air filter.... As I understand those codes...... somehow either 10% more or less fuel or 10% more or less air is being found (or requested and not found) by your ECM. If that makes sense. Search P0170 and P0173 - there are a few threads on this issue.

I have a G56 Exhaust on my car and installing (or making) a free-flowing exhaust alone, or even with an aftermarket free flowing air filter, will not cause those codes.

In chasing P0173 I replaced one not so great fuel pump that would not hold fuel pressure, switched the C02 sensors in the exhaust to see if that changed the code (it did not), replaced both intake manifold gaskets, and finally installed Emil's Fuel System Upgrade kit. No more code with Emil's system. Cannot say enough good things about Emil and his system that delivers fuel to both fuel rails at the same time the way S&S designed the fuel system to operate. And a real fuel filter BEFORE the injectors and an actual fuel pressure regulator with a gauge and ability to adjust fuel pressure is a bonus.

Good luck. Search the codes themselves on here for more info.

Re: Engine Management Fault Codes [Re: Barrythebrave] #692587
09/03/21 02:15 PM
09/03/21 02:15 PM
Joined: Jun 2019
Posts: 25
B
Barrythebrave Offline OP
Just Getting Started
Barrythebrave  Offline OP
Just Getting Started
B

Joined: Jun 2019
Posts: 25
Thanks for the info

The fault is on permanently on the Rear Cylinder now and the idling is hunting at around 1800 revs until the car is stationary when it drops down again.

Fitted a new fuel pump a while back so I’ll rule that out for now.

Baffles out and new air cleaner fitted about a1000 miles ago and no faults until now.

I’ll start with the intake seals first and go from there I guess

Re: Engine Management Fault Codes [Re: Barrythebrave] #692599
09/03/21 03:01 PM
09/03/21 03:01 PM
Joined: Aug 2009
Posts: 534
Rio Del Mar, CA
kankeL Offline
Talk Morgan Regular
kankeL  Offline
Talk Morgan Regular

Joined: Aug 2009
Posts: 534
Rio Del Mar, CA
Sticking idle can be due to a bad idle module or a higher than usual fuel pressure.

https://www.ebay.com/itm/333898484626


2016 M3W, Army Green Matte/Tan Leather, 17k miles
Re: Engine Management Fault Codes [Re: Barrythebrave] #692600
09/03/21 03:04 PM
09/03/21 03:04 PM
Joined: Aug 2019
Posts: 146
Las Vegas
JohnMat Offline
L - Learner Plates On
JohnMat  Offline
L - Learner Plates On

Joined: Aug 2019
Posts: 146
Las Vegas
I had problems with fast idling which slowed when you stop, like you describe: it turned out the bottom bolt on the throttle body had sheared and air was leaking in.

See this post

Last edited by JohnMat; 09/03/21 03:06 PM.

2020 M3W
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