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No fire w/MS Wasted spark

9

90volvo

Well-known member
Joined
May 27, 2017
Location
Eldorado Springs Mo.
Kind of a weird deal. 1990 volvo 240, Turbo 2.3, Microsquirt with Wasted Spark w/VW Jetta coil Bosch 032905106
I converted from my distributor setup to wasted spark about 2 months ago Im using Bosch 032905106 it has the internal igniter. I changed couple setting in tunerstudio like MS instructions say to do. Car ran great, idle great and started great. Well one moring went out to start car, was hard to start and was missing a little. I drove it to work and home with no problem. Figured was time change to spark plugs so no biggy.

Well next day, would not start, I had another coil I was using for back up. Threw it on real quick and car fired right up and ran great. Went to work and back, no problem. Then next morning, no start. So today, I had time to mess with it. Checked for spark, pulled a plug and verified no spark. So I pulled the coil harness plug out and checked for rpm while cranking and have nothing. I checked the CPS plug and all looked good. Im assuming with no rpm during cranking that it would be bad CPS? Is that correct or Im I missing something here.
 
Do a Diagnostics & High Speed Loggers --> Tooth Logger log. It should look sort of like this - this one is getting extra spikes to to noise, but the general shape with one long line every 2 valleys is correct. If you zoom in, you should be able to count 58 lines (60-2) from long line to long line:

MicroSquirt 60-2 Tooth Logger Crank-to-Run.png
 
Do you have the going high/Low set correctly for that coil?

What dwell time are you using?

This sounds like it might be a failing crank sensor, or improper coil settings.

Oh! How is the coil mounted? The aluminum part with the connector is just pushed into some contacts on the coil. It needs to be bolted down for it to remain securely connected to the coil.
 
It makes no sense that it would not log rpm due to a faulty coil.

Dwell time, if set to high, will burn up the coil. I use 3.6ms on my B20 and it seems happy with that. Looking for info that is what AI produced for your coil: The dwell time for the 032905106 ignition coil is typically around 3.5 to 6.4 milliseconds, depending on the RPM range and specific tuning requirements.

Check the grounds for your ECU, since there are more than one issue it seems. I am not familiar with how your wiring is done, but in my experience it seems when a flaky ground is involved all kinds of anomalies occur.
 
nalletill1000 said:
It makes no sense that it would not log rpm due to a faulty coil.

Dwell time, if set to high, will burn up the coil. I use 3.6ms on my B20 and it seems happy with that. Looking for info that is what AI produced for your coil: The dwell time for the 032905106 ignition coil is typically around 3.5 to 6.4 milliseconds, depending on the RPM range and specific tuning requirements.

Check the grounds for your ECU, since there are more than one issue it seems. I am not familiar with how your wiring is done, but in my experience it seems when a flaky ground is involved all kinds of anomalies occur.
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checked settings, it was set on going high. I will change it to going low, also yes I have it bolted down to the upper firewall, I have 1/2 inch piece of aluminum under it. Big question is, with setting going high, is new coil already burned up? If never ran? But did some cranking.
 
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Going High is the correct setting - it energizes the coil for the short dwell time only, and leaves the coil un-energized otherwise. Going Low with the same coil will burn it up - it energizes the coil for all BUT the short dwell time.
 
Late last night I pulled the CPS with plan to drop a new one in, well I have forgotten what a pain it is to get one back in it. For me, short thick arm its a real pain. Im built like TREX,lol. Im seriously thinking about moving to front crank cps setup. It would make my life alot easier. So basically I did not get anything done as far as datalogging in TS. Anyways, I will give another day of getting it back in. I have the GM trans adapter but I knotched it for plenty of room. Im just real tight to firewall. I appreciate all you guys help.
 
Well, because it was cooler out I decided to go out and mess with car. I have a cps that was used and managed to get dropped in (have a new bosch coming tomorrow). Hooked laptop up and did the diagnostics with tooth count etc. I have nothing. So maybe the used cps is bad? I put new one in tomrrow and redo.
 
90volvo said:
In the MS manual it says to set the coil to High, searched out of curiousity on google and get conflicting answers. Im going back to going High. TY
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I misspelled and meant too high of a value for dwell time. Sorry for the confusion. This is what it says in my TS and I use Speeduino "Whether the spark fires when the ignition signal goes high or goes low. Nearly all ignition systems use 'Going Low' but please verify this as damage to coils can result from the incorrect selection. (NOTE: THIS IS NOT MEGASQUIRT. THIS SETTING IS USUALLY THE OPPOSITE OF WHAT THEY USE!)" So follow what the recommendation is for MS and your coils.
 
Installed new CPS yesterday and car fired right up. I am going to move the coil, its above the valve cover on the firewall, which I think is better than being on the v.cover. But from what I have read up on, cooler you can keep it the better for it. Which it wasnt my problem but? Anways thanks for everyones help.
 
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