JCE Posted July 22, 2012 Report Share Posted July 22, 2012 Im having "long" start with my engine. its a 4.3 V6 Triggers: Crank 3 teeth/Hall, Cam 1 teeth/Hall. I understand the engine might need to turn 2 times (depending on engine position) before it gets signal from Cam and start injecting+giving spark. But starting just seems longer than a normal car engine. Same thing with cold and hot engine. It starts immediatelly when it starts, so its not a hard start, just long.... I tried Pre-Crank prime, no affect. Engine starts to 1200 rpm then comes down to idle speed 600 rpm Maybe its just because of the triggers? And its not really a problem, just a "Feature" ??? Quote Link to comment Share on other sites More sharing options...
Simon Posted July 22, 2012 Report Share Posted July 22, 2012 The way to tell is to see when the ECU shows RPM. As soon as it see RPM then it should be trying to fire. If it is taking a long time to get triggers then it will take a long time to start. If however it sees triggers and RPM quickly and doesn't fire then we are looking for another issue. Also if you are using a stepper motor for idle control it might be due to a key on lockout while the stepper resets. Quote Link to comment Share on other sites More sharing options...
JCE Posted July 29, 2012 Author Report Share Posted July 29, 2012 Im using key-off for stepper reset+ecu hold power and key-on fuel lockout is 0 sec. Just feels strange it takes so long to start, my car start alot faster....when it starts the rpm goes upto about 1200pm then comes down to idle speed 600rpm, so i assume it is getting enough air @ start. Uploaded my map if u see anything strange in it.... 8-)base map 7-2012.zip Quote Link to comment Share on other sites More sharing options...
JCE Posted August 11, 2012 Author Report Share Posted August 11, 2012 Still having a long start :? Been trying out all the crank enrichments but doesnt seem to affect. I watched a video of a Mercruiser MPI starting and it start up alot quicker than my engine. Guess i need to check how fast the ecu gets the triggers and sees rpm.....Will do that tomorrow. And as before engine runs without any problems etc The engine doesnt "FIRE UP" like most engines. Maybe it is a "hard start" after all but whats causing it is another thing... Quote Link to comment Share on other sites More sharing options...
bsh Posted August 11, 2012 Report Share Posted August 11, 2012 Are you running E85? Quote Link to comment Share on other sites More sharing options...
JCE Posted August 11, 2012 Author Report Share Posted August 11, 2012 No, 98E5 . Always same fuel. My cam trigger is a hall sensor and the triggerwheel is Half/Half. Should i use cam level instead of cam pulse. Could this affect the starting? What are the benefits of a cam level type of triggering? It gives 2 position signals? Rising+Falling, instead of just 1 ? Many cars seem to use it.... And i always let the fuel pump do its prime, before cranking. Quote Link to comment Share on other sites More sharing options...
JCE Posted August 12, 2012 Author Report Share Posted August 12, 2012 Been testing with Cam level, no affect. I believe now it has something to do with warm up enrichment. Engine start fast/good when @ 50-60C. Maybe too little fuel or too much.... hmmm. But @ idle with cold engine 10-15C AFR is around 11,5, then leans out with temp to 14 when warm 70C. Quote Link to comment Share on other sites More sharing options...
JCE Posted August 18, 2012 Author Report Share Posted August 18, 2012 I adjusted the crank enrichments/temp table and now the engine "Fires up" @ any temp Good. Now i just need to get Cam Triggering changed, so it gets 1pulse/ 1 crank rotation. Quote Link to comment Share on other sites More sharing options...
JCE Posted August 20, 2012 Author Report Share Posted August 20, 2012 I now made a new trigger wheel to the cam and it has now 2 teeth with 180 deg between. And changed to "Crank Pulse x1" It now starts up alot faster Quote Link to comment Share on other sites More sharing options...
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