Stock 96 new MSPNP2 install - lean stumble
04-15-2016, 11:02 AM
#1
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Join Date: Apr 2016
Location: Houston, TX
Posts: 2
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Stock 96 new MSPNP2 install - lean stumble
Total newb here. I followed the MegaSquirt PNP Gen2 Documentation and installed the MS9697PNP2 into my stock 96 miata. The car ran great on the OEM ECU with 14 degree timing bump. I read the Tuner Studio MS New User Guide, MegaSquirt PNP Gen2 Manual and searched for similar forum posts.
My issue is that the car leans out and stumbles off idle. I can feather it, but if I blip the throttle from idle it falls on it's face. Runs and pulls pretty well throughout the rest of the rev range.
Base map for 94-97 1.8 from Megasquirt's website
Base timing has been set and verified per the installation document
MTX-L grounded at the post by the throttle body and calibrated as:
Point1: 1.0 9.7
Point2: 3.68 18.2
Reads within 0.2 of what TunerStudio sees
TPS has been calibrated
Barometric Correction total vacuum(%) and rate(%) set to 0. Barometric correction curve is set to 100%
Required Fuel is set as:
1800cc engine size
265cc injector size
Still using the MAF
Thermistor Measurements are:
2490 Ohms
-4 16150
104 1150
176 330
Here are my tables:
A tune and short log of it idling and revving attached.
I drove around with AutoTune on and it did modify over a 100 cells. Do I just need to make the cells where it stumbles richer? That makes the fuel table really odd looking. Is it a setting that I'm missing? Any help would be greatly appreciated!!
My issue is that the car leans out and stumbles off idle. I can feather it, but if I blip the throttle from idle it falls on it's face. Runs and pulls pretty well throughout the rest of the rev range.
Base map for 94-97 1.8 from Megasquirt's website
Base timing has been set and verified per the installation document
MTX-L grounded at the post by the throttle body and calibrated as:
Point1: 1.0 9.7
Point2: 3.68 18.2
Reads within 0.2 of what TunerStudio sees
TPS has been calibrated
Barometric Correction total vacuum(%) and rate(%) set to 0. Barometric correction curve is set to 100%
Required Fuel is set as:
1800cc engine size
265cc injector size
Still using the MAF
Thermistor Measurements are:
2490 Ohms
-4 16150
104 1150
176 330
Here are my tables:
A tune and short log of it idling and revving attached.
I drove around with AutoTune on and it did modify over a 100 cells. Do I just need to make the cells where it stumbles richer? That makes the fuel table really odd looking. Is it a setting that I'm missing? Any help would be greatly appreciated!!
Last edited by Chobo; 04-15-2016 at 11:58 AM. Reason: additional info
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04-17-2016, 01:17 PM
#2
Newb
Thread Starter
Join Date: Apr 2016
Location: Houston, TX
Posts: 2
Total Cats: 0
Follow up: I've read more similar threads, adjusted my tables further and auto tuned.
I also disabled EGO control and played with the Acell Enrichments. I set it to 50/50 split between MAP and TPS like I saw another member do with a similar issue.
The car doesn't have as noticeable off-idle stumble anymore, but the AFR still goes super lean for a moment with any throttle input from idle.
Am I moving in the right direction here? I would love to hear your feedback!
I also disabled EGO control and played with the Acell Enrichments. I set it to 50/50 split between MAP and TPS like I saw another member do with a similar issue.
The car doesn't have as noticeable off-idle stumble anymore, but the AFR still goes super lean for a moment with any throttle input from idle.
Am I moving in the right direction here? I would love to hear your feedback!
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