Enginerd81 Posted April 21, 2018 Share Posted April 21, 2018 I am running Megasquirt 2 wired in similar to below wiring diagram with an 83 distributor and using the MAP sensor. Under very light/cruising conditions the power will suddenly drop out then come right back. Makes for a sudden jerk as driving. Took it to a track day last year and didn't have any problems at continuous WOT. As I type this I thought a deadspot in the TPS (although it was new 2 years ago when I installed MS) I'll check that tomorrow morning. Any other ideas that I could look for or check? Thanks, bryan Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted April 21, 2018 Share Posted April 21, 2018 What does your data log say? Quote Link to comment Share on other sites More sharing options...
Enginerd81 Posted April 21, 2018 Author Share Posted April 21, 2018 haven't gotten a chance to data log yet. Assume I should log FI pulse width and Spark advance? Bryan Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted April 21, 2018 Share Posted April 21, 2018 Your data log will log it all. Post it up. Make sure ithe occurrence happens in the log. Quote Link to comment Share on other sites More sharing options...
Enginerd81 Posted April 22, 2018 Author Share Posted April 22, 2018 (edited) Here are 2 examples. It looks like MAP is getting funky readings. One spike high and one spike low. Examples are right at the end of the logs. Thanks, Bryan Disregard 2nd image. Can't seem to figure out how to get rid of it. 2018-04-21_18.59.46.msl 2018-04-21_19.01.49.msl Edited April 22, 2018 by Enginerd81 Quote Link to comment Share on other sites More sharing options...
Chickenman Posted April 22, 2018 Share Posted April 22, 2018 What version of Tuner Studio did you Log with Free version or Paid version. Many selectable fields are missing. I wanted to see if you had any Sync loss. But the field was not viewable. Did you edit out any fields from Data logging? Quote Link to comment Share on other sites More sharing options...
Chickenman Posted April 22, 2018 Share Posted April 22, 2018 Think I found the issue... at least with the Datalogs missing information. You are using an ancient Firmware on that ECU. Original B&G version 2.60. .B&G code is over 12 years old. You should update your firmware to MSExtra code. Latest release version for MS2 is 3.4.2. Lots of improvements and bug fixes since the B&G firmware. You update the ECU Firmware from within Tuner Studio. Choose " Firmware Update " in the Tools Menu. Your laptop must be online with your MS ECU and must be connected to the Internet. Update your Firmware and reload your Tune. I would advise making a brand new Project file after the Firmware update to keep things straight. Otherwise you may have issues with file mismatches. You will get a signature mismatch on your Tune when you update the Firmware . Easy to fix. Just make sure that you your Laptop is connected to your ECU and Internet at the same time. You will be given an Option to download the latest signature files. That will update your Tune Signature format to match the new Firmware. Note: Do NOT confuse the ECU firmware update with Tuner Studio software update. Two different things. Think of Firmware as a Bios update on your Laptop or Desktop computer and Tuner Studio software update as Windows/MAC OS updates. Quote Link to comment Share on other sites More sharing options...
Enginerd81 Posted April 22, 2018 Author Share Posted April 22, 2018 Thanks! I will get that done today and report back with new logs. To answer previous questions - Nothing edited and I'm using paid versions of log viewer and tuner studio. Bryan Quote Link to comment Share on other sites More sharing options...
Chickenman Posted April 22, 2018 Share Posted April 22, 2018 (edited) Might be an idea to take screenshots of your settings and Export/Import your Tables. Then start a New project and Tune using the 3.4.2 defaults. The way you will get a clean build from scratch with all of the MS Extra 3.4.2 default settings. WUE, ASE AE etc. And you don't have to worry about signature mismatches. Edited April 22, 2018 by Chickenman Quote Link to comment Share on other sites More sharing options...
Chickenman Posted April 22, 2018 Share Posted April 22, 2018 I'm suspecting the MAP spike is in response to some other issue. It's a symptom rather than a cause. Quote Link to comment Share on other sites More sharing options...
Enginerd81 Posted April 22, 2018 Author Share Posted April 22, 2018 Looks like I need to pull the ecu and put a jumper wire to get it into boot loader mode. I'll probably do that next weekend. Bryan Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted April 24, 2018 Share Posted April 24, 2018 The MAP sensor isn't the only thing giving weird readings - there are massive battery voltage spikes too. Where exactly is the relay board grounded, and are you using high or low impedance injectors? Quote Link to comment Share on other sites More sharing options...
malibud Posted May 2, 2018 Share Posted May 2, 2018 MAtt Cramer You cannot receive any private messages so here it goes ... I live in Asheville NC. and do not know of anyone who is familiar with MS Datsuns (l28et) and that has a dyno. Do you have anyone you would recommend? I am not opposed to trailering it to Atalanta or Charlotte. Thanks For your time Dan Carroll dc1298@hotmail.com Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted May 3, 2018 Share Posted May 3, 2018 Tuners in the Atlanta area that we often work with would be Doug Wilkes at DBW Motorsports, or Arif Hossein at YAI Racing. There's also Zen Motors in Suwanee. Quote Link to comment Share on other sites More sharing options...
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