Matt1436215379 Posted September 20, 2012 Report Share Posted September 20, 2012 Hi there, Could be a stupid question sorry but im doing my head in. I have a msd ready to run dizzy feeding an atom. Everything works as it should, run all the tests to check all functions, tps, ignitior, injectors etc and they all work flawlessly. The problem i have is i cant get any rpm signal, If i connect the dizzy straight to the coil as it used to when it was run carby i get a normal spark. As far as im aware everythings wired as per the manual and setup the same. Hopefuly theres something simple ive overlooked?  Cheers Matt Quote Link to comment Share on other sites More sharing options...
Scott Posted September 21, 2012 Report Share Posted September 21, 2012 Hi Matt, When you have your laptop connected to your ECU and PClink open, press F12 to open the runtime values. Change to the Triggers/Limits tab and look at the Trig1 Signal and Trig2 Signal, they should both say yes when the engine is cranking. If they say Yes, the next thing to look at is the Engine Speed (on the same tab) it should be 200 to 300 RPM when cranking. Scott Quote Link to comment Share on other sites More sharing options...
Matt1436215379 Posted October 2, 2012 Author Report Share Posted October 2, 2012 had no luck with the msd so went back to standard hall effect from a vr v8 and bosch ignitor. Now when i crank i get spark if i connect a plug directly to the ht lead from the coil and both triggers say yes when i look at the runtime values, but i get no engine speed. The fuel pump primes/stays on as it should and turns off after ive finished cranking. Is there a reason that i shouldnt be seeing an RPM signal? Â Cheers Matt Quote Link to comment Share on other sites More sharing options...
Simon Posted October 2, 2012 Report Share Posted October 2, 2012 Do you only have the trigger from the distributor so only one trigger input or do you have a sync from another sensor? Quote Link to comment Share on other sites More sharing options...
Matt1436215379 Posted October 2, 2012 Author Report Share Posted October 2, 2012 I have both the trigget inputs to the dizzy with the sync set to none Quote Link to comment Share on other sites More sharing options...
Simon Posted October 2, 2012 Report Share Posted October 2, 2012 If you can post your map I can check over the settings. I assume you are on 1 tooth per TDC trigger mode. Quote Link to comment Share on other sites More sharing options...
Matt1436215379 Posted October 30, 2012 Author Report Share Posted October 30, 2012 Hi there again guys, I have a new problem now, surprise surprise. When under load at around 4000rpm i get a massive misfire and the motor wont rev past that at all. we have only just started tuning on the dyno but after a few days nothing we have tried has worked. Im using the factory holden v8 efi dizzy hall sensor, intermotor 15020 ignition module, have been using a msd blaster ss with a primary resistance of 5 ohm but have also used another coil, along with a new ignitor module incasse the onther was damaged, with resistance of .4ohms. Both myself and the dyno operator are almost at a complete loss as where to head from here. Ive attatched the current file we are using, also a log. The dyno drops the rpm signal when the misfiring happens and doesnt realy ever give a constant signal through any rev range up to there. Thanks in advance for any time you spend with this. Matt Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 1, 2012 Report Share Posted November 1, 2012 I dont see much in your log to suggest you have any trigger issues now. I would suggest you check ignition timing with a timing light to make sure it matches what is commanded by the ECU at a few different RPMs. Also check that rotor phasing is ok at various levels of advance (cut a hole in an old dist cap). Also, both your ignition and fuel maps could do with some smoothing, I know you have only just started tuning it but you have some fairly abrupt changes from cell to cell in some areas. You also possibly have a bit too much advance in the 4000-5500RPM, 80KPa area and that 5500 RPM column doesnt look good at all. Quote Link to comment Share on other sites More sharing options...
Scott Posted November 1, 2012 Report Share Posted November 1, 2012 Hi Matt, Do you have a wideband O2 sensor connected while tuning? If yes, what are the ratios doing when the engine is misfiring? Scott Quote Link to comment Share on other sites More sharing options...
Matt1436215379 Posted November 2, 2012 Author Report Share Posted November 2, 2012 Cheers Adam, we had checked the phasing by drilling a hole in the cap and the rotor did exactly what is was meant to, checked when it was misfiring and didnt move from where it should have been pointing. Havnt been to worried about smothing at this stage and havnt even thought about that 5500 column yet. Appreciate you time thanks Scott, Yea the dyno has the wideband setup. It runs pig rich, well lower than 10 dropping to 8 at times. No real need to use it as when its misfiring the rear of the car dissapears in black smoke. Have now put a link 2channel ignitor to eliminate that as a potential problem and hasnt solved it. Also put an inline tester on a plug lead, We have a very small miss on idle and right the way through the rev range. then under load when it missus the light in the tester barely comes on at all which is what we expected ( next to no spark) and the reason it wont rev. It feels like a crossfire or some kind of limit is in place I guess its hard to explain through a forum and its looking like it has nothing to do with the ecu or the setup now. Again thanks for your time Matt Quote Link to comment Share on other sites More sharing options...
Scott Posted November 4, 2012 Report Share Posted November 4, 2012 Hi Matt, I would be interested in hearing what the problem is when you get it solved. Good luck with it, Scott Quote Link to comment Share on other sites More sharing options...
Matt1436215379 Posted November 6, 2012 Author Report Share Posted November 6, 2012 No worries, Had an intermitant good patch. Ended up playing around with some vacuum lines and it seemed to fix the problem for a day. Managed to get everything tuned up to 5000rpm then as soon as we got to tuning the 5500cells the same problem arose, not able to rev under load. Must have been coincidence. Is there some sort of limp mode in the ecu? and apart from the obvious limits is there anything to stop it giving a spark signal? Matt Quote Link to comment Share on other sites More sharing options...
Simon Posted November 7, 2012 Report Share Posted November 7, 2012 Only thing in the ECU to limit spark will be the Limits. Any errors for AN inputs will show at the top of PCLink screen. You can also look in the ECU stats to see what the max readings have been. Quote Link to comment Share on other sites More sharing options...
Tommy Luhr Posted November 7, 2012 Report Share Posted November 7, 2012 You should use '1 tooth per TDC' if you using a regular ditributor with hall sensor an 8 pins or gap to the sensor. You are running 'multitooth' right now. Rising and falling spark is another thing that mess everything up. I´m not shure what you should drive here! And clean the fuel and ignition maps to sort things out. Interpolate is a good funktion to make them look nice in a minute. Then you have some calm maps to work with Quote Link to comment Share on other sites More sharing options...
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