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Old 07-15-2006, 01:33 AM   #1
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I have been wrestling with a problem with the Emanage in the circuit, but not when it is bypassed. I want to thank all those people here and on other sites that have offered exchange parts for ignition and ECU swaps. It seems I have been able to find and correct the problem.

First; the problem. It started about a year ago when at high speed I got one episode of bucking and I could either accelerate under boost, or take my foot totally off the gas. Trying to hold a steady speed would just slam the drive train back and forth. The WBO2 read very rich. It could have been flooding or misfire.

I could find nothing wrong and it did not re-occur for months. Then, on a long trip at high speed this spring, it came back. I bypassed the Emanage completely, opened my wastegate, bumped up my timing and drove the rest of the weekend NA.

Since that trip, I have been chasing the problem every day. Thanks to TurboTim, I was able to swap out the injection parts and rule that out. I chased differences in voltage between the Emanage outputs and ECU outputs to no avail.

EDIT: Note the problem worsened recently to a point that the idle was "hunting" and it would sometimes stall at idle with Emanage attached, but zeroed out.

Today I found the problem

This is what I posted on the Emanage group:

I'm publishing this because I think I found the root of all my
problems(at least with the Emanage). It is working now and it might be
beneficial to others to know the story.

I had tested almost everything according to the workshop manual,
ignitor, coils, injectors, etc including the AFM, but today decided to
rip the AFM apart to look at it.

What I found was that when I put a meter on the end of the resistance
strip and the terminal for the gliding contact, that I was getting
erratic readings.

I cleaned the resistance strip and adjusted the gliding contact so that
it had more downward pressure. Mind you, it had checked out good to
the workshop manual specifications, but now I was down in the guts and
could move everything little by little and see the variations.

Put everything back together and it idled like a kitten with the
Emanage in the circuit. Put my maps back in and went for a ride;
everything perfect.

I am supposing that the noisy signal from the AFM can be absorbed
normally by the ECU(which is why it worked when I bypassed the
Emanage), but that putting the Emanage in the circuit causes the
Emanage to constantly adjust to the noise and eventually it goes into
overload and can't handle any more.

Even when there is no map or adjustment, the Emanage needs to interpret
the signal and transfer it to the ECU. It could also be that the
amount of processing needed to keep up with the signal could affect the
ability of the Emanage to process other signals, but I am just
speculating here.

The logging of the AFM input with the Emanage was clean. But since it
is much slower at logging than at processing and seems to level the
signal reporting, it is conceivable to me that it could have looked OK.

Last edited by olderguy; 07-15-2006 at 08:06 AM.
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Old 07-15-2006, 04:08 AM   #2
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That's some awesome info....I've been getting a slight buck in the higher rpms, but I think it's my a/f ratio bouncing a bit.
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Old 07-15-2006, 08:21 AM   #3
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Nice OG.... Nice....

Dave,
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Old 07-15-2006, 11:44 AM   #4
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Glad you got it sorted out.

So your EM is ok then?
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Old 07-15-2006, 11:47 AM   #5
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Quote:
Originally Posted by Jefe
Glad you got it sorted out.

So your EM is ok then?
Both of them are

When I was blaming it on the EMB, I bought a new one from Mohd to make sure that it was new, from a dealer and guaranteed. Now I have a backup(or for my next project)
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Old 07-15-2006, 08:34 PM   #6
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Quote:
Originally Posted by olderguy
Both of them are

When I was blaming it on the EMB, I bought a new one from Mohd to make sure that it was new, from a dealer and guaranteed. Now I have a backup(or for my next project)
I'm sure you have an OTM that could use a little extra HP
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Old 07-21-2006, 03:50 PM   #7
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Quote:
Originally Posted by olderguy
Both of them are

When I was blaming it on the EMB, I bought a new one from Mohd to make sure that it was new, from a dealer and guaranteed. Now I have a backup(or for my next project)
You can use my car for that next project....
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Old 10-08-2007, 04:26 PM   #8
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I have got the same problem now. With the stock ecu the car is running ok and with EMB connected, sometimes the engine is flooding ( afr 11 ) and running rich..
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Old 10-08-2007, 04:52 PM   #9
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Quote:
Originally Posted by billis View Post
I have got the same problem now. With the stock ecu the car is running ok and with EMB connected, sometimes the engine is flooding ( afr 11 ) and running rich..
Look to the AFM first. Just cleaning the contact strip and pressing the brushes harder against it by loosening the nut and sliding the assy further down the shaft corrected the problem for me.
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Old 10-09-2007, 04:38 PM   #10
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Quote:
Originally Posted by olderguy View Post
Look to the AFM first. Just cleaning the contact strip and pressing the brushes harder against it by loosening the nut and sliding the assy further down the shaft corrected the problem for me.
Thanks! I forgot to mention that I have a 04 miata car. It is running great under acceleration but there some fractuations and flooding ( afr from 14 to 11, 11,5 12 etc) at constant speed and cruising conditions., Sometimes it is running ok sometimes not!! . I notice that when the car passes some road holes , the flooding occurs!!

Vasilis
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Old 10-10-2007, 09:45 AM   #11
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Quote:
Originally Posted by Braineack View Post
You can use my car for that next project....
It was used on Paul's car until he got squirted. Now he drives with one eye on the road and the other on the laptop watching all the pretty gauges:gay:
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Old 10-10-2007, 09:47 AM   #12
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Quote:
Originally Posted by billis View Post
Thanks! I forgot to mention that I have a 04 miata car. It is running great under acceleration but there some fractuations and flooding ( afr from 14 to 11, 11,5 12 etc) at constant speed and cruising conditions., Sometimes it is running ok sometimes not!! . I notice that when the car passes some road holes , the flooding occurs!!

Vasilis
Sorry, when you said the same problem, I thought the same vehicle.:gay:

Sounds like a loose connection or loose ground.
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