Zmanco Posted October 16, 2008 Share Posted October 16, 2008 So can the flyback portion of the board be taken out?If you set the PWM Current Limit to 100% then I don't think there would be anything gained by trying to modify the circuit. And in case you haven't already checked, make sure you have the PWM set to 100% since you have high Z injectors. Now that I think about it, did you tell us which version of MS board you're using? v3? I just skimmed the posts but didn't find it right away. Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted October 16, 2008 Share Posted October 16, 2008 Jeff, Have you tried taking the MSD out of the mix? Sometimes they can go out but not fully and just kinda make things crazy.. It would be at least worth a shot. I feel your pain man and I really wish I could be more of a help. Gabe Link to comment Share on other sites More sharing options...
jeffer949 Posted October 17, 2008 Author Share Posted October 17, 2008 I have taken it out. Just not recently. On my first trip from Daytona to nashville i took it out but it didnt change anything. Im running MS1+extra with the V3.0 board. running 29v code. Link to comment Share on other sites More sharing options...
jeffer949 Posted November 2, 2008 Author Share Posted November 2, 2008 Well I may of fixed it. Havent driven it that much yet but i drove it around the block with no resets. Normally it would of resetted like 30 times in that situation. What i did was this Since it is a MS1( the 40 pin CPU) you may be able to improve the disturbance margin by adding some capacitors on to the CPU socket legs as close as possible . Capacitor should be mylar or cermic, 0,1µf =>10 V and have lead module 2,5 or 5 mm. Add caps as follows: Pin 1 to Pin 2 Pin 6 to pin 2 Pin 19 to pin 20 EDIT by mobythevan, this last cap should be between 31 and 32, this has been verified I got that from a post on msextra.com. Has anybody ever heard of shorting out the power resistors for running High Z injectors? I think i want to try this also. Well ill keep ya posted Link to comment Share on other sites More sharing options...
Zmanco Posted November 2, 2008 Share Posted November 2, 2008 Glad to hear the caps are (so far) showing improvement. That would confirm it's a noise problem. Has anybody ever heard of shorting out the power resistors for running High Z injectors? I think i want to try this also. Not sure about this: if you're running high-z injectors then you don't need the resistors in the first place so yes, you can/should short them out (same as removing them). But I don't see how this would reduce noise in the system that contributes to your reset problem. In theory the resistors are limiting the current which should be reducing EMI. Still, it's worth a try - just be sure they really are high-z Link to comment Share on other sites More sharing options...
jeffer949 Posted November 2, 2008 Author Share Posted November 2, 2008 what numbers on the board are they? Link to comment Share on other sites More sharing options...
Zmanco Posted November 3, 2008 Share Posted November 3, 2008 Are we talking about the same resistors? I'm referring to the ones that are in series with the injectors to limit current for non-PWM applications with low-z injectors. In this case the resistors are too large for the relay board and will be mounted elsewhere (not sure where they were on the 280z - perhaps someone else can chime in here). If you pulled your own wires from the relay board to the injectors then you don't have any resistors (unless you added them elsewhere). Link to comment Share on other sites More sharing options...
jeffer949 Posted November 3, 2008 Author Share Posted November 3, 2008 We are talking about something different. ive read on the MS forums to short out some resistors on the board to give the injectors full current. but im not sure which ones they are. Link to comment Share on other sites More sharing options...
Zmanco Posted November 3, 2008 Share Posted November 3, 2008 Ah, I vaguely remember there being an option in the assembly instructions. Since I don't remember clearly I'd suggest you go back through the instructions if someone else doesn't chime in. But again, increasing current flow through the injectors is more likely to increase EMI than to reduce it. Link to comment Share on other sites More sharing options...
jeffer949 Posted November 3, 2008 Author Share Posted November 3, 2008 Ive talked to the guy who made the post on MSEXTRA.com Its R37 and R38 You can jumper them if your running High z or resistors. Link to comment Share on other sites More sharing options...
jeffer949 Posted November 3, 2008 Author Share Posted November 3, 2008 Ok I did a mod that got my voltage to be compleatly flat!!! It is spectacular. I did a 8 min data log and my voltage only went up and down .7 volts. Its on this page. http://www.diyefi.org/forum/viewtopic.php?f=6&t=285&st=0&sk=t&sd=a&sid=f34d645f34003cd4f1ecb13594549e36&start=10 I havent seperated the grounds yet but I did the mod where you cut the line trace to R3. I suggest this mod to EVERONE. Its amazing how steady my voltage is. Link to comment Share on other sites More sharing options...
mobythevan Posted December 29, 2008 Share Posted December 29, 2008 Any updates? Link to comment Share on other sites More sharing options...
jeffer949 Posted December 30, 2008 Author Share Posted December 30, 2008 Its been running better but it's been messing up and getting what i think are resets(I say think because my laptop got stolen so i cant be for sure) Not nearly as many as i used to get. Some days it wont have any but then the next it will be back. I still haven't separated the grounds yet. I just started working this past week again so ill have some more money to throw at it. Im fighting a charging problem right now so thats taking priority. I may say screw it and order a new MS. Ive read that the 3.47 board has the ground issues cleared up. We will see. Will probably be a few weeks till I get to that point yet. I thought of something else the other day also. Its that my MSD box and my MS box are both getting there switched power from the same point. So im thinking that maybe the MSD box is backfeeding into the MS somehow. So im going to try to move my switched power to another location for my MS relay board. Link to comment Share on other sites More sharing options...
mobythevan Posted December 30, 2008 Share Posted December 30, 2008 We worked on my friends truck today and I think it is fixed. All the caps had been added as noted earlier in this thread (also notice that I added a bold note because I think one cap was listed wrong). He was still getting resets, but what we found is that they were related to low battery voltage. The PO had wired the cooling fan to run all the time so it was always draining the battery after being parked until it pulled down the coolant temps. We put a relay so it only runs when the truck is running and re-charged the battery. It runs great now. We will see if he gets any more resets in the next few weeks. I think it was a combination of adding caps and having a charged battery in his case. Link to comment Share on other sites More sharing options...
jeffer949 Posted January 7, 2009 Author Share Posted January 7, 2009 Well Im going to call this one licked. It was my damn MSD 6A. I took it out and it was gone. I had it wired up so the it was getting its switched power from the same source as my MegaSquirt. So IDK if i could of changed that and it would of worked but I took it out and I havent had a noticable reset since. I did also make a new fuel injector injector wiring harness but i dont think that had anything to do with it. Link to comment Share on other sites More sharing options...
Zmanco Posted January 7, 2009 Share Posted January 7, 2009 Interesting that you solved the issue by removing the MSD 6A. I run with one too (6AL, but basically the same box). I very much doubt changing where you switched the power would make a difference. In a closed system such as a car, that really only matters for devices that have very small signals, such as O2 sensors. I've been thinking of removing mine as well. I originally installed it when I ran triple webers and thought the multiple spark would help at idle and also liked the idea of a protective rev limiter to prevent damage if I missed a shift at the track. But with MS I get a rev limiter and I don't think multiple spark really made any difference. And getting rid of the box (and the noisy tach converter) would probably improve reliability as well. Hmmmm.... Link to comment Share on other sites More sharing options...
OneSickZ Posted February 9, 2009 Share Posted February 9, 2009 Sorry i didn't explain enough as it is topic related. im having rfi issues and need a resistor plug so i was searching and found this post which describes some of my issues and im just trying to hunt it down. EDITED by mobythevan:question was where do you get your br8 plugs from and I am concerned about 5/8 vs 13/16 Answer: Autozone or http://www.sparkplugs.com/default.asp?KID=2521&gclid=CL63mrLxz5gCFQNbxwodWT3W1A Link to comment Share on other sites More sharing options...
rvandivort Posted April 12, 2009 Share Posted April 12, 2009 So, just get MS11! What an ordeal to go thru! Thanks for the additional information about grounding, etc. A mistake can illuminate. The Neils Bohr comment is very relevant. Well, the snow is almost gone. Back to work. Roger Link to comment Share on other sites More sharing options...
jeffer949 Posted May 8, 2009 Author Share Posted May 8, 2009 Im going to burn this effing ecu!!!! Its back it reset like 5 times where i had to turn my ignition switch off and then back on again. I think it may have something to do with the pullup resistor but im not sure. Ill keep ya posted Link to comment Share on other sites More sharing options...
mobythevan Posted May 8, 2009 Share Posted May 8, 2009 Hmmm... not good news. Link to comment Share on other sites More sharing options...
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