https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?board=pgmc The Autonerdz Community Forums en-us The Autonerdz Community Forums Sat, 14 Nov 2026 07:43:27 GMT http://blogs.law.harvard.edu/tech/rss YaBB 2.5 AE Revision: 1.29 30 https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1790790113 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1790790113 james@cycleimprovements.com (James H) Mon, 5 Oct 2026 15:10:18 GMT Embarrassed that I missed this but just realized that my cranking compression valve of 160 psi and running compression value are close to the same which obviously isn't right. I originally checked for air leaks and there was none that I could see. I am going to have to look again or for another possibility... https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1772392993 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1772392993 Wed, 11 Mar 2026 20:45:06 GMT Grant, great point on the cummins fan as I have seen that, makes no sense, but is what it is.<br /><br />James, I guess this is the old question of what does a good one look like. Material states between 600 and 800 MV and I seen no corelation to that anywhere. Most throttle I have seen are revers, one starting say for example, 5 volts and  decending and the other starting at 0 and rising. Again how did they do it and sure would be nice to see a known good one working.<br /><br />Thanks for the info both guys,<br /><br />Larry https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1759447763 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1759447763 Tue, 10 Feb 2026 19:07:58 GMT okay, going to post a fix on this, as I always say, makes sense once you find it. Talked to a couple buddies and turns out pretty simple. Initioally when I started it months ago with a new battery when kicking it I started all the way at the top. If you look at DSO patterns this takes you through, CEC, or depending ECE, but enough cycles to transition fuel through the system, makes sense from later. On a good day or if warm you only needed to pump half way through the kick to the compression stroke qt the bottom and it would fire. After looking at all systems, spark, timing you name it and great compression but sometimes when cold would not light, but with a sniff and maybe not even then. BUT. FULL choke cold all the way at the top, going through 3 cycles viewed with scope and it will ice cold start on the 2nd or third kick. Once warm then would fire right at the bottom. So was a simple fix and luckily with the Pico I refused to replace numerous electrical items as they all showed to be solid. Once again if this would have had and electric start or bump started it would have fired.<br /><br />Larry https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1770582778 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1770582778 Sun, 8 Feb 2026 20:32:58 GMT An older, quite interesting case study about parallel two piston engines with a 270° TDC piston off set. <br /><br /><a href="https://www.picoauto.com/library/case-studies/triumph-investigation" target="_blank">https://www.picoauto.com/library/case-studies/triumph-investigation</a> https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1739823935 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1739823935 Sun, 4 May 2025 02:11:52 GMT Thanks to those of you who responded. I know I don't owe an explanation for why it's been so long but business is good so I've been too busy to report back. A few days after posting I was able to fix it with a new battery. Yes I know we all should be testing batteries, alternators and starters anytime an erratic electrical problem occurs, especially a vehicle. But on a 4wheeler that doesn't crank slow, who would? (This guy from now on) <img src="https://yabb.autonerdz.com/yabbfiles/Templates/Forum/tans/smiley.gif" border="0" alt="Smiley" title="Smiley" /> In the file you're correct Larry, when it acts up it would misfire, because the ECM was wigging out due to the bad battery. I'm not sure I have much faith in PICO diagnostics and I'll attempt to post files showing why. The old battery showed, good needs recharging. I understand it was not fully charged but at 94CCA and resistance and such why didn't it just say replace? I replaced the battery and retested and it ran like a champ. So this reiterates the importance of testing the battery first in any electrical diagnostics and incorporating it into part of a service or PM https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1724265315 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1724265315 Fri, 23 Aug 2024 11:41:47 GMT <a href="https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1724265315/7#7">James H wrote</a> on Aug 22^nd, 2024 at 8:48am:<br /><div>Pico TA018. I know if its up close to the coil then the amperage reading is wildly inaccurate. I am kinda at a loss cause I have not seen it on anything else. </div><br />Try putting the voltage trace with it. That may give some insight. https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1718841409 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1718841409 Trevor@autonerdz.com (TrevorSchlientz) Thu, 20 Jun 2024 16:08:40 GMT After looking at the capture I can't come to any conclusions. <br /><br />I need to know more about where your connections were made and what was happening at the time. The noise you saw just looks like noise to me. https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1711932306 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1711932306 Wed, 24 Apr 2024 12:58:33 GMT Thank you for the feedback James. <br /><br />Just looking at your last picture with the overlay I can see an increase of around 1 psi in #3 intake waveform. Also #3 intake vacuum not only is significantly lower during the intake stroke but in addition it stays low for a shorter period time/rises earlier compared to #4.<br /><br />The achieved vacuum levels while cranking, in particular of #4, look surprisingly high to me. The  high cranking speed of well above 300 rpm  may, partially, cause this. https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1705508202 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1705508202 papaslop@yahoo.com (HarleyMike) Thu, 25 Jan 2024 18:08:26 GMT Reply #4 says the valve clearance is within specs.<br /><br />They could have been tight, and as the drive-ability of the machine got worse someone adjusted the valves (damage already done) to try and make it better.<br /><br />I don't think that kinda wear happened overnight! https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1699471320 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1699471320 Trevor@autonerdz.com (TrevorSchlientz) Fri, 24 Nov 2023 18:42:39 GMT James is this module a stand alone device? <br /><br />This sounds like a good example where we need to verify the whole system. <br /><br />Powers, grounds, commands, outputs. If the driver module has adequate power feeds, ground integrity, and is receiving the proper commands, and it can't perform its duty, its junk.