MSPNP2 Idle issues when warm
07-24-2020, 05:18 PM
#1
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Join Date: May 2020
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MSPNP2 Idle issues when warm
Okay so this past week i installed megasquirt onto my 1991 miata. I followed all instructions, the AFM got deleted by an GM IAT sensor, i have a AEM X-series wideband. The car was idling and running fine before MS. When installed, i got the car to start and here is how it reacts.
Cold start: When starting cold, it may take a while but it starts, yet it fluctuates in idle and AFR, from about 200-900rpm and about 15-20AFR. Now because of this I increased fuel on the VE table
Warming up: As it warms up and i added fuel, the car will idle in the 14.4-15.5 range and seem fine.
Warmed up: Once the car is warmed up and the idle fan comes on the idle becomes lower and the car has a choppy almost cammed-like sound to it yet the AFR seems fine, then gradually the AFR gets leaner and leaner until the car dies (I even try increasing fuel on the table but it still dies). When the car dies i try and start it up and it starts then immediately shuts off again, after a few more tries to start it, the car wont start and only crank.
Take note that the car is on DIYautotunes Basemap, timing is correct ,wideband is accurate on TS and Ive been trying to figure out if its a tune issue or not? what do you guys think ? here are 2 datalogs and the tune (VE table might be wack due to playing with it.)
Cold start: When starting cold, it may take a while but it starts, yet it fluctuates in idle and AFR, from about 200-900rpm and about 15-20AFR. Now because of this I increased fuel on the VE table
Warming up: As it warms up and i added fuel, the car will idle in the 14.4-15.5 range and seem fine.
Warmed up: Once the car is warmed up and the idle fan comes on the idle becomes lower and the car has a choppy almost cammed-like sound to it yet the AFR seems fine, then gradually the AFR gets leaner and leaner until the car dies (I even try increasing fuel on the table but it still dies). When the car dies i try and start it up and it starts then immediately shuts off again, after a few more tries to start it, the car wont start and only crank.
Take note that the car is on DIYautotunes Basemap, timing is correct ,wideband is accurate on TS and Ive been trying to figure out if its a tune issue or not? what do you guys think ? here are 2 datalogs and the tune (VE table might be wack due to playing with it.)
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07-27-2020, 08:47 PM
#3
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Join Date: Dec 2007
Location: ATL
Posts: 1,377
Total Cats: 129
Some basic questions;
- How did you set Req Fuel? What size Injectors are you using?
- Are you boosted or N/A?
Some observations;
- You may not have enough warm-up enrichment (WUE) to keep the mixture from leaning out before the after-start enrichment (ASE) tapers out. The two of those are additive and keep enough fuel going into the engine while it is warming up.
- You might want to turn off EGO Control to simplify your life (for now) until you get your idle under control.
- You're running 10 degrees of fixed timing - is there a reason for that?
- How did you set Req Fuel? What size Injectors are you using?
- Are you boosted or N/A?
Some observations;
- You may not have enough warm-up enrichment (WUE) to keep the mixture from leaning out before the after-start enrichment (ASE) tapers out. The two of those are additive and keep enough fuel going into the engine while it is warming up.
- You might want to turn off EGO Control to simplify your life (for now) until you get your idle under control.
- You're running 10 degrees of fixed timing - is there a reason for that?
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07-28-2020, 08:38 PM
#5
Newb
Thread Starter
Join Date: May 2020
Posts: 16
Total Cats: 0
Some basic questions;
- How did you set Req Fuel? What size Injectors are you using?
- Are you boosted or N/A?
Some observations;
- You may not have enough warm-up enrichment (WUE) to keep the mixture from leaning out before the after-start enrichment (ASE) tapers out. The two of those are additive and keep enough fuel going into the engine while it is warming up.
- You might want to turn off EGO Control to simplify your life (for now) until you get your idle under control.
- You're running 10 degrees of fixed timing - is there a reason for that?
- How did you set Req Fuel? What size Injectors are you using?
- Are you boosted or N/A?
Some observations;
- You may not have enough warm-up enrichment (WUE) to keep the mixture from leaning out before the after-start enrichment (ASE) tapers out. The two of those are additive and keep enough fuel going into the engine while it is warming up.
- You might want to turn off EGO Control to simplify your life (for now) until you get your idle under control.
- You're running 10 degrees of fixed timing - is there a reason for that?
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