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Old 04-17-2013, 05:43 PM   #1
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Default Wayyy too rich. Running out of ideas.

Ok so here are the car specs.

1.8, GT2554R, 460cc RX7 injectors, MAF delete, EBC solenoid, MSPNP2

Using TunerStudio

So i took the base map DIY gave me and adjusted the req_fuel constant down as well as the cranking and enrich percentages.

First turn of the key and it would start but stall out quickly afterward.

The AFR's were down around 9 to 10 so i began to adjust the VE bins down trying to get a good idle going.

The car will now idle very poorly and still runs very rich. The table is down so low that i have values of zero in some bins.

I am just out of ideas. I dont want to go any lower on my req_fuel constant and even if i got a better idle from pulling fuel on the table it would not be functional under throttle.

I have no shame in just taking it to a tuner and letting them have at it but my closest tuning shop is an hour and a half from me in mobile and they said they dont like working with megasquirt but would be willing to give it a try.

I'm in the Florida panhandle so if anyone is near my area and wants to make some cash by all means let me know and i will trailer it right to yah.

Otherwise any suggestions are much appreciated.

Thank you in advance.
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File Type: msl 2013-04-12_10.45.57.msl (656.4 KB, 73 views)
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Old 04-17-2013, 06:04 PM   #2
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Dude, your MAP is FUBAR. Always reading ~100kPa (which means WOT on a normally aspirated car). No wonder you're rich.

Is your MAP line connected? Also, MS's can be configured for various different types of MAP sensors. Make sure your configuration is OK. If the reading is still wrong, then call the MSPNP for warranty.

Last edited by hornetball; 04-17-2013 at 06:44 PM.
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Old 04-17-2013, 06:42 PM   #3
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Make sure the MS is getting a MAP reading. I've had a vacuum line come disconnected between the intake manfold and MS before, sounds like that may be the issue.
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Old 04-17-2013, 09:24 PM   #4
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Ok, so I tried for another 3 hours dicking around with it and the line is good all the way to the manifold. The map reading floats between 100 and 101 kpa. I don't know how I am supposed to change configuration for the MAP. Seems like I shouldn't have to do that in the first place if they built the thing and put a base map on it. I'm just fed up at this point. I need to find someone willing to troubleshoot and tune it because this is way beyond me. If anyone has suggestions for a good tuner in the southeast U.S let me know. I don't want to give up but i feel like I'm beating the crap out of my motor every time I try and start it.
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Old 04-18-2013, 09:56 AM   #5
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Quote:
Originally Posted by chrisrm82 View Post
I don't want to give up but i feel like I'm beating the crap out of my motor every time I try and start it.
Well your motor wants you to plug your MAP sensor to the IM so it can run correctly and then slap your face.


I wrote a bunch of mean nasty stuff here but deleted it...
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Old 04-18-2013, 10:05 AM   #6
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As i said the line from the map sensor to the IM has been traced and is not pinched cracked broken nothing.
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Old 04-18-2013, 10:28 AM   #7
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Things I would do:

1. Find your ECU.
Go to step 2.

2. Is there a vacuum line connected to it?
If No go to step 3.
If Yes skip to step 4.

3. Connect vacuum line between Intake Manifold and Megasquirt.
Go to step 8.

4. Follow line to see where it goes, are there kinks/pinches in line?
If kinked/pinched, go to step 5.
If connected to nothing, go to step 3.
If connected to intake manifold, go to step 6.

5. Straighten or replace line and go to step 3.

6. Disconnect vacuum line from manifold, turn key position to on with Tunerstudio open suck/blow in line and monitor MAP pressure.
Does MAP pressure move between ~30kpa and ~115kpa?
If Yes go back to step 1.
If No watch and calibrate sensor, then go to step 7:



7. Repeat sucking and blowing test, does it work now?
If No, then possible MAP failure.
If Yes, go to step 1.

8. Reload base map, drive and tune car.

IMO, either the ECU is broke or it's not getting a map signal. Since it's reading 100kpa, which is correct if it's not connected to anything; I would assume it's not connected to anything rather than broke.
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Old 04-18-2013, 04:07 PM   #8
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Originally Posted by pdexta View Post
IMO, either the ECU is broke or it's not getting a map signal. Since it's reading 100kpa, which is correct if it's not connected to anything; I would assume it's not connected to anything rather than broke.
Occam's Razor.
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