CamH Posted February 12, 2009 Share Posted February 12, 2009 Hey everyone, Here's what I've got: 1983 rebuilt L28ET with forged bottom end with compression bumped to 8:1 Factory distributor Good condition factory turbo injectors No intercooler Factory turbo in good condition MegaSquirt II v3.57PCB LC-1 wideband O2 sensor MSA downpipe 240Z coil I wired it like this: I have been working on MegaSquirting my Z since late December. Just last weekend, I finished all the wiring (I think and hope!). Everything is nicely soldered together, and looks great. Just today I got it so all of the sensors seem to be working. It displays the correct RPM when cranking, AFRs show the same as the gauge (not very helpful since it won't start) TPS works fine after I calibrated it, etc. Anyways, I am not getting any spark, and I am not sure why. I have 12v at the coil, and the - side of the coil is wired to pin 36 on the MegaSquirt. I have the ignition settings set to 'Spark Output' to 'Going High (Inverted)' and set 'Coil Charging Scheme' to 'Standard Coil Charge', per the article on DIYautotune. When cranking, I continue to get 12v on the + side of the coil, and the - side of the coil seems to be grounding out from pin 36, as I think it should. With my multimeter it jumps from 12v to ~5ish but I doing think the multimeter can change fast enough to show that it is actually grounding. I've done nothing to the inside of the MegaSquirt itself as far as playing with jumpers go. It is just bone stock from DIYautotune. I'm not really sure if anything there needs to be changed. I'll post my msq file and a few seconds of a datalog while cranking in a little bit, I have them both on the laptop I am using to tune it. I appreciate any help or suggestions! Thanks! Quote Link to comment Share on other sites More sharing options...
X64v Posted February 12, 2009 Share Posted February 12, 2009 Are you not getting any spark out of the coil itself, or no spark out of the plug wire? If none out of the plug wire, your trigger angle could be far enough off to spark when the rotor isn't pointing at one of the terminals in the dizzy cap. My other thought was perhaps your dwell settings are way out of wack, but I'll check that when you post your .msq. Quote Link to comment Share on other sites More sharing options...
CamH Posted February 12, 2009 Author Share Posted February 12, 2009 No spark out of the coil itself. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted February 12, 2009 Share Posted February 12, 2009 I have an older MSII and I did need to move/add/subtract a couple of jumpers. Things may be different now. Email Matt Cramer at DIY he might know. Quote Link to comment Share on other sites More sharing options...
CamH Posted February 12, 2009 Author Share Posted February 12, 2009 Here are the MSQ files and the datalog (which I'm not sure will be helpful). megasquirt.zip Quote Link to comment Share on other sites More sharing options...
X64v Posted February 12, 2009 Share Posted February 12, 2009 When I pulled up your .msq, your dwell settings came up at 25.5ms for both Max Dwell Duration and Max Spark Duration. All the rest of the tables and settings came up normal so I'm pretty sure it loaded correctly. If these are the values you have entered in, they're way too big. Dwell should be about 3.0ms-3.5ms, and spark duration should be .5ms to 1ms. Edit: I pulled up one of my old .msq files, I successfully used 3.4ms dwell and .5ms discharge time with a 240z coil. They also worked well for my 280zx coil and still work well for my blaster ss coil. Quote Link to comment Share on other sites More sharing options...
CamH Posted February 12, 2009 Author Share Posted February 12, 2009 When I pulled up your .msq, your dwell settings came up at 25.5ms for both Max Dwell Duration and Max Spark Duration. All the rest of the tables and settings came up normal so I'm pretty sure it loaded correctly. If these are the values you have entered in, they're way too big. Dwell should be about 3.0ms-3.5ms, and spark duration should be .5ms to 1ms. Edit: I pulled up one of my old .msq files, I successfully used 3.4ms dwell and .5ms discharge time with a 240z coil. They also worked well for my 280zx coil and still work well for my blaster ss coil. Thank you very much - I didn't put those values in, they are left over from someone else's settings. That will be the first thing I try when I next go down to work on the car on Saturday. Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted February 12, 2009 Share Posted February 12, 2009 What's in the Q16 slot on your Megasquirt? Quote Link to comment Share on other sites More sharing options...
naviathan Posted February 12, 2009 Share Posted February 12, 2009 If that is truely what your dwell settings were while you were cranking, you might want to pull the cover and check your coil driver. Settings that high can easily and quickly smoke the transistor. Quote Link to comment Share on other sites More sharing options...
CamH Posted February 12, 2009 Author Share Posted February 12, 2009 What's in the Q16 slot on your Megasquirt? Is that on the inside of the MegaSquirt? If so, I'll have to look at it. What should it be? Quote Link to comment Share on other sites More sharing options...
naviathan Posted February 12, 2009 Share Posted February 12, 2009 Q16, top right corner. It'll be either a VB921 or the new BIP373. Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted February 12, 2009 Share Posted February 12, 2009 If it's the BP then he shouldn't have to worry - it will shutdown because of thermal protection, the VB though would be fried... Quote Link to comment Share on other sites More sharing options...
naviathan Posted February 12, 2009 Share Posted February 12, 2009 If it's the BP then he shouldn't have to worry - I will shutdown because of thermal protection, the VB though would be fried... I know, I fried a VB once by using a dwell setting at 4. Didn't think it was that big a difference, but I found out the hard way that a VB smells horrible when the magic smoke gets out. Quote Link to comment Share on other sites More sharing options...
CamH Posted February 12, 2009 Author Share Posted February 12, 2009 Well, there was never any smoke or anything, so I am assuming that I have the newer part inside, but I will have to check it out. It was purchased about a month and a half ago if that's any help. Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted February 12, 2009 Share Posted February 12, 2009 You'll want to check; some Megasquirts are set up for 5 volt output and have that slot empty. Quote Link to comment Share on other sites More sharing options...
CamH Posted February 13, 2009 Author Share Posted February 13, 2009 You'll want to check; some Megasquirts are set up for 5 volt output and have that slot empty. Well it is a standard MegaSquirt II PCB v3.57 from your website ordered in late December. Would that tell you how it is off the top of your head? Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted February 13, 2009 Share Posted February 13, 2009 They're set up for 5 volt output (no Q16) unless special ordered with direct coil control output. You may need to put in a BIP373. Quote Link to comment Share on other sites More sharing options...
dexter72 Posted February 13, 2009 Share Posted February 13, 2009 Do you guys think he might need a Bosch 124 or other ignition module to fire the coil?. I had this issue a year ago with my megasquirt and it ended up not being setup to fire the coil directly. He may need one to get it to spark. I just went to the junk yard and pulled two of them off of some 80's volvo's. Worked like a charm after I wired it up and then bought a brand new one afterwards. Quote Link to comment Share on other sites More sharing options...
X64v Posted February 13, 2009 Share Posted February 13, 2009 Do you guys think he might need a Bosch 124 or other ignition module to fire the coil? Nope, a BIP373 is fully capable of running the 240z coil. Quote Link to comment Share on other sites More sharing options...
CamH Posted February 14, 2009 Author Share Posted February 14, 2009 They're set up for 5 volt output (no Q16) unless special ordered with direct coil control output. You may need to put in a BIP373. Hmm, so basically, I am hosed until I solder in this part? Quote Link to comment Share on other sites More sharing options...
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