no spark on 1 and 3 log attached
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Having trouble getting my miata going again after a head gasket replacement. I verified mechanical timing 3 times. It turns for a little and sounds like it going to catch but doesnt start. I used my timing gun and found out I got no spark on cylinder 1 and 3. Replaced ignition coil, wires, plugs, crank sensor, and cam sensor. I tried loading a few different tunes and the car behaves the same. Still no luck starting. Any and all help appreciated thanks.
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Why is your MAP sensor reading 150 kPa?
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Thank you sir
I removed the emissions equipment because I didnt think megasquirt used that map sensor. I reinstalled the emissions tonight and took another log. This is on a base map because im afraid one of the old maps might of fried my coilsmap. In despiration I messed up my old maps so much I figure it would be better to start over. I did remember to calibrate coolant, tps ect. I still need to find out why its reading 150 kpa because I took another log tonight and it still reads high. That map sensor thats reading 150 kpa is the one attached to the emissions equipment right? |
That should be the MAP sensor inside the MegaSquirt, unless you are running a MicroSquirt or MS3-Pro. You first need to calibrate the MAP sensor under Tools -> Calibrate MAP / Baro to get it to read right.
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Ok thank you
I have the diy pnp. I calibrated the sensor to my current local kpa. I have no idea how, but when I went to test spark after the map sensor calibration I got spark on all 4 cylinders. Worried I might have a bad connection somewhere. Anyway went ahead to set ignition timing and she almost started. It seemed like it wasnt spot on until my trigger angle was -27. Going to lower the cranking pulse width tomorrow and hopefully ill be set. |
Can you also post your MSQ?
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Maybe the timing light didnt fire because the engine was flooded? Anyway I lowered and raised my cranking pulse width but still no start. I left the values where it sounded promising. My car cranks at 180-200 rpm, sounds like it did before but is that a little slow? I have been keeping the car on a battery tender for the last month or so. Right after I built the diiy pnp 6 months ago it fired right up on a base map.
Thanks for your time, MSQ attached |
If you can't get the trigger angle set in the -20 to +20 degree range, set Ignition Input Capture to Falling Edge.
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Thanks,
So yesterday I played around with falling edge with various values from -30 to +30. The car sounded like it wanted to start again but it still wouldnt start. Today I was able to have my gf crank the car so I can look at the crank with a timing light instead of adjusting values blindly and sure enough I had no spark on cyl 1 again. Heres the crazy part. I only had spark on cylinder 4. And each time that cylinder would fire the car would knock like it wanted to start. I even checked the timing light on another car and it worked perfect. |
What sort of coils are you using?
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Its a factory replacement for a 99 miata.
I just got back in town I figure ill try the old coil tomorrow to see if I still only get spark on cyl 4. I guess I could resistance test them both also, as I am hesitant to buy another. |
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