Starting at 88 kpa on map
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Starting at 88 kpa on map
Hey guys
Have been out if the ms loop for a bit since its in the car I drive for winter, trying to diagnose some hard starting, then I noticed it likes to start at 88 kpa in the fuel map, why is this and can I change it?
Have been out if the ms loop for a bit since its in the car I drive for winter, trying to diagnose some hard starting, then I noticed it likes to start at 88 kpa in the fuel map, why is this and can I change it?
1989 Mitsubishi Mighty Max 4WD 2.6 MS1 V2.2
1989 Mitsubishi Mighty Max 2WD lowered 2.6 Weber 38 soon to megasquirt
1993 Eagle talon TSI Soon to megasquirt
1989 Mitsubishi Mighty Max 2WD lowered 2.6 Weber 38 soon to megasquirt
1993 Eagle talon TSI Soon to megasquirt
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Re: Starting at 88 kpa on map
What is the atmospheric pressure where you are? There is no vacuum in the intake manifold when you start to crank and depending on plenum size it can take a little while to pull down.
Find the Manuals up top under Quick links: Manuals.
Cheers Luke
Cheers Luke
Re: Starting at 88 kpa on map
slow_hemi6 wrote:What is the atmospheric pressure where you are? There is no vacuum in the intake manifold when you start to crank and depending on plenum size it can take a little while to pull down.
Looks like approx 102kpa, never thought of this hmm, interesting.
See the problem is it's such a rich start cause of it being so high in the fuel map, but should it not listen to my priming pulse that I chose?
Maybe it's happening so quick but it's the after start enrichment that's following
1989 Mitsubishi Mighty Max 4WD 2.6 MS1 V2.2
1989 Mitsubishi Mighty Max 2WD lowered 2.6 Weber 38 soon to megasquirt
1993 Eagle talon TSI Soon to megasquirt
1989 Mitsubishi Mighty Max 2WD lowered 2.6 Weber 38 soon to megasquirt
1993 Eagle talon TSI Soon to megasquirt
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- Super MS/Extra'er
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Re: Starting at 88 kpa on map
My 250 PSI cold cranking 4 cylinder comes to life in the 95 KPA range. I normally comes to life in about .3 sec of cranking at about 150 RPM. 80 KPA intake cranking MAP is not your issue. Start up setting is the battle. My motor switches to the VE table at 300 rpm.
Andy
Andy
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Re: Starting at 88 kpa on map
MS1 does have a "fixed MAP after start" option that is sometimes used to compensate for an uneven MAP signal immediately after startup.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
Re: Starting at 88 kpa on map
I have switched to this, but still having a hell if a time starting it some days.Matt Cramer wrote:MS1 does have a "fixed MAP after start" option that is sometimes used to compensate for an uneven MAP signal immediately after startup.
Think my problem is compounded by it being a tbi set up, spraying gas at a closed throttle plate
1989 Mitsubishi Mighty Max 4WD 2.6 MS1 V2.2
1989 Mitsubishi Mighty Max 2WD lowered 2.6 Weber 38 soon to megasquirt
1993 Eagle talon TSI Soon to megasquirt
1989 Mitsubishi Mighty Max 2WD lowered 2.6 Weber 38 soon to megasquirt
1993 Eagle talon TSI Soon to megasquirt
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- Super MS/Extra'er
- Posts: 2221
- Joined: Tue May 04, 2004 8:20 pm
- Location: St Louis
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Re: Starting at 88 kpa on map
whittlebeast wrote:
Andy
Ha ha ok I can when I get some skate time
1989 Mitsubishi Mighty Max 4WD 2.6 MS1 V2.2
1989 Mitsubishi Mighty Max 2WD lowered 2.6 Weber 38 soon to megasquirt
1993 Eagle talon TSI Soon to megasquirt
1989 Mitsubishi Mighty Max 2WD lowered 2.6 Weber 38 soon to megasquirt
1993 Eagle talon TSI Soon to megasquirt
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- Super MS/Extra'er
- Posts: 2221
- Joined: Tue May 04, 2004 8:20 pm
- Location: St Louis
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Re: Starting at 88 kpa on map
This is the sort of thing I am looking for when chasing down starting.
Here is what my motor looks like in the first second of coming to life. You can see from the MAP, when the motor starts to to crank. You can see from the Engine code when the squirt detects the motor is cranking as an Engine code 3. As soon as the motor exceeds 300 RPM you can see the engine code switch and you will also see the VE come on line. At the bottom, you see that the MAT and CLT are stable indicating that the grounding of the sensors is totally isolated on a dedicated ground plane.
You can't see it in this screen shot but my AFR comes on line 17 sec later. I power my wideband fron the same relay that powers my fuel pump.
Sorry, Forgot this screen shot.
http://www.nbs-stl.com/CrxTypeR/B18C%20Startup.PNG
Hope this helps
Andy
Here is what my motor looks like in the first second of coming to life. You can see from the MAP, when the motor starts to to crank. You can see from the Engine code when the squirt detects the motor is cranking as an Engine code 3. As soon as the motor exceeds 300 RPM you can see the engine code switch and you will also see the VE come on line. At the bottom, you see that the MAT and CLT are stable indicating that the grounding of the sensors is totally isolated on a dedicated ground plane.
You can't see it in this screen shot but my AFR comes on line 17 sec later. I power my wideband fron the same relay that powers my fuel pump.
Sorry, Forgot this screen shot.
http://www.nbs-stl.com/CrxTypeR/B18C%20Startup.PNG
Hope this helps
Andy