Well my battery voltage does drop all the way down to 5-7V when cranking. Returns to 13V when not cranking. It's a pretty dead battery jumpered to a strong, charging battery in a running car. I figured the drop was normal due to load. I've seen some weird battery related issues before but not exactly like this. Possible that the amp load on the single good battery between the running car and starter is too great? Try throwing a new battery+jumpers at it? I'm at a loss at this point so I'm willing to try about anything.
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Something is wrong then. I'd clean all of the positives and grounds, including the connections at the main fuse and the alternator positive terminal.
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You're losing sync - reasons 31 and 32. https://www.miataturbo.net/megasquir...reasons-43775/
Have you twisted any of the trimpots on megasquirt? |
Originally Posted by sixshooter
(Post 1523479)
Something is wrong then. I'd clean all of the positives and grounds, including the connections at the main fuse and the alternator positive terminal.
Originally Posted by gooflophaze
(Post 1523480)
You're losing sync - reasons 31 and 32. https://www.miataturbo.net/megasquir...reasons-43775/
Have you twisted any of the trimpots on megasquirt? |
It happens, but it shouldn't be happening this frequently / consistently in the MS's I've poked. Check your sensor spacing, and maybe tweak the trimpots. Also, what side of Atlanta are you on?
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Ah - you've also changed your edge detection from falling to rising. Change that back before fiddling.
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You're losing sync because the voltage is dropping below 6V. Ask me how I know. Essentially there's not enough power to run the MS.
Yeah that's a dead battery. Mine was doing the same after all the failed cranking tests. Would drop all the way down to 5.6V. Swapped to new battery, reset to basemap values for cranking PW, car has started each time. Swap to new. Try again. New battery starts at 12ish, and drops to mid 9s at the lowest now. First crank started at 12.1 and pulled down to mid 8s. After that always mid high 9s now that the car is in use. |
Originally Posted by gooflophaze
(Post 1523484)
Also, what side of Atlanta are you on?
Originally Posted by wherestheboost
(Post 1523491)
You're losing sync because the voltage is dropping below 6V. Ask me how I know. Essentially there's not enough power to run the MS.
Yeah that's a dead battery. Mine was doing the same after all the failed cranking tests. Would drop all the way down to 5.6V. Swapped to new battery, reset to basemap values for cranking PW, car has started each time. Swap to new. Try again. New battery starts at 12ish, and drops to mid 9s at the lowest now. First crank started at 12.1 and pulled down to mid 8s. After that always mid high 9s now that the car is in use. |
Snellville. Let me know if you need a hand. And change your edge detection from rising to falling.
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Yeah I had jump started it and drove for 1.5 hours or so.. Too far gone it seemed. Good luck!
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Originally Posted by Wingman703
(Post 1523478)
Well my battery voltage does drop all the way down to 5-7V when cranking. Returns to 13V when not cranking. It's a pretty dead battery jumpered to a strong, charging battery in a running car. I figured the drop was normal due to load. I've seen some weird battery related issues before but not exactly like this. Possible that the amp load on the single good battery between the running car and starter is too great? Try throwing a new battery+jumpers at it? I'm at a loss at this point so I'm willing to try about anything.
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2 Attachment(s)
Fresh battery and jumpers, shiny clean grounds, and a fixed AFR readout. No change to attempted start, does the exact same thing as before. It just can't push past ~300 RPM to fully get going. I have all the ingredients but can't make a cake. WHAT IS WRONG??????
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Originally Posted by sixshooter
(Post 1522648)
?Que?
Yes, the port pointing toward the cam cover does not show boost. Its originally used for the charcoal canister. Use the forward pointing port. This one works normally and will show vacuum and boost. |
Completely irrelevant as that's a 1.6 and I'm only dealing with 1.8's here.
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ok so you know for sure the 1.8 manifold does not have a similar arrangement. how would explain your map behaviour from post #10 then?
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Originally Posted by lsdlsd88
(Post 1524232)
ok so you know for sure the 1.8 manifold does not have a similar arrangement. how would explain your map behaviour from post #10 then?
For my own sanity I compression checked the motor. Completely cold, 1-4 I got 180, 180, 180, 160. Perfectly reasonable for a 128k mile OEM motor with 80+ track hours and three over revs. I jumperd GND/FP and confirmed I had fuel pouring into a bottle. Pump is strong. I have fuel. I have spark. I have compression. It has to be some tune issue. |
You do not have full sync. Assuming that log was a continuous crank, you only have one of your crank or cam sensor responding. Need a tooth log.
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^^^. You're getting ~30 lost sync events during that cranking attempt. Check the gap on your crank position sensor. Need ~1 credit card's gap in between. It has a tendency to loosen at times. And check cam sensors as well. And also, do what goof says.
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Originally Posted by gooflophaze
(Post 1524235)
You do not have full sync. Assuming that log was a continuous crank, you only have one of your crank or cam sensor responding. Need a tooth log.
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Run a composite log before you do anything. Check to see the condition of the trigger wheel while you're at it.
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