Quagmire Posted September 24, 2009 Share Posted September 24, 2009 Right, so my 3.5 90 is finally running on Megajolt! Everything appears to be running smoothly and it starts much better, runs more smoothly (it didnt feel rough before, so this was quite a surprise) and pulls better, first tank was 1.5mpg better on consumption too However, on checking my trigger wheel- vr sensor alignment i found that it is running at about 6deg BTDC on EDIS alone, rather than 10deg. This is not a problem as i will adjust the position later but have compensated in MJ for now. The thing that i wanted to ask about was this- my timing marks show up as a blurred line, rather than a single white stripe. Instead of seeing a nice 1.5mm line, i am getting a blurred stripe about 4-5mm thick- is this down to my timing light, or could i have a problem with EDIS somewhere? This makes timing things a bit of a guess which i don't like. Next question is this. I run the vehicle on LPG 99% of the time, only using petrol when I am out of gas. The LPG is a single point, closed loop system whereby the liquid fuel is vaporised and then fed into the carbs as a gas via mixer rings. A lambda sensor reads the EGO and controls a stepper motor to control the flow of gas and achieve the correct mixture. This is all fine, however at idle I can get some hunting as the system plays about with the mixture. The system has connections to take a reading from a throttle position sensor, the idea being that at idle the system goes "open loop" to prevent hunting. However, being a carbed system, running MAP sensing I have no TPS. Could I use the Megajolt outputs in some way to fool the LPG control box into thinking that it is seeing a TPS in the closed/idle position? I was thinking i could take an output triggered at say <800rpm... Thanks Jamie Quote Link to comment Share on other sites More sharing options...
RangeyRover Posted September 26, 2009 Share Posted September 26, 2009 you could use one of the user outputs of the jolt, but it is either on or off. I dont know how difficult it is to mount a TPS on your spindle, but I might try that. what does the lpg look for? Low voltage at low revs from TPS at idle or high? I think that you might need the user output to go low at less than 900rpm. Bear in mind that the outputs switch to ground, and are current limited to 500mA So to do this needs at least a 24 ohm resistor connected to the user output with the lpg sensing from the resistor. examples from autosport labs If the lpg system allows you to set a threshold then it would be easy RR Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted September 26, 2009 Share Posted September 26, 2009 It's unlikely, but have you got EDIS multi-spark turned on? Quote Link to comment Share on other sites More sharing options...
Aragorn Posted September 27, 2009 Share Posted September 27, 2009 Ye, i was thinking a blurred line sounds a bit like its firing twice in rapid succession, or the duration of the spark was somehow too long, i wasnt aware there was a "multispark" option, but if there is i'd be looking there! Quote Link to comment Share on other sites More sharing options...
Quagmire Posted September 28, 2009 Author Share Posted September 28, 2009 Multispark is not an option in current version of MJ... Will try digging out another timing light and see if I get any difference. As for the closed loop box- it is adjustable so if I can find the circuit diagram I should be away! Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted September 28, 2009 Share Posted September 28, 2009 Also unlikely is the VR sensor or bracket wobbling or the trigger wheel moving about, unlikely but possible. Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted September 29, 2009 Share Posted September 29, 2009 Try another timing light ! ……………. The simpler the better………..Some timing lights seem to be affected by wasted spark ….. especially dial back type timing lights and often these will show twice the wanted timing. Have a google search ……….there are many issues with timing lights & wasted spark ………. but not quite so bad with true multispark systems. With the 90 (MS/EDIS) I gave up with the expensive ‘snapon’ light and purchased a cheapy Gunson light ………. Perfect. Multispark was / is only available on EDIS4 and only on the later modules. I have done a lot of research and it seems that it was never an option with EDIS6 / EDIS8. Quote Link to comment Share on other sites More sharing options...
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