no spark on 1 and 3 log attached
#1
no spark on 1 and 3 log attached
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.
#3
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?
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?
#5
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.
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.
#7
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
Thanks for your time,
MSQ attached
Last edited by Chased; 10-08-2014 at 10:05 PM.
#9
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.
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.
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