superdog405 Posted January 31, 2010 Share Posted January 31, 2010 Hi guys, I have a '90 superliner with a e6 350. It does'nt like to start under 40 degrees,but if you run the block heater over night it starts right up with almost no smoke.I also have a'89 superliner with the same engine, it's not been pluged in yet & always starts right up. Any ideas on this? Could it be something in th injection sys.? Thanks! Quote Link to comment https://www.bigmacktrucks.com/topic/12460-hard-starting-e6/ Share on other sites More sharing options...
Rob Posted January 31, 2010 Share Posted January 31, 2010 Hi guys, I have a '90 superliner with a e6 350. It does'nt like to start under 40 degrees,but if you run the block heater over night it starts right up with almost no smoke.I also have a'89 superliner with the same engine, it's not been pluged in yet & always starts right up. Any ideas on this? Could it be something in th injection sys.? Thanks!Hi there, late or retarded injection timing will do that as will low compression and/or injection pressure.I would pull the pump and injectors and send them in for calibration.The cost on having pumps rebuilt is about $200.00 per hole, and about $60.00 per injector. I had this done about six months ago on an E6-350 engine I've slated for a B61.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/12460-hard-starting-e6/#findComment-48793 Share on other sites More sharing options...
superdog405 Posted January 31, 2010 Author Share Posted January 31, 2010 Thanks for the info Rob, very helpful! Quote Link to comment https://www.bigmacktrucks.com/topic/12460-hard-starting-e6/#findComment-48794 Share on other sites More sharing options...
Rob Posted January 31, 2010 Share Posted January 31, 2010 Thanks for the info Rob, very helpful!Certainly hope it's just a calibration issue but I've seen popoff pressure in the nozzels be problematic too. An inline Mack engine should start very well down to about 25 degrees without heat applied. None of mine will crank 10 seconds before popping off at that temp. I'm assuming you have good batteries with an adequate cranking speed as that all applies too.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/12460-hard-starting-e6/#findComment-48796 Share on other sites More sharing options...
fjh Posted January 31, 2010 Share Posted January 31, 2010 Thanks for the info Rob, very helpful!I would check the drain back valve for a broken spring and also for air leaks on the suction line before condemming a fuel pump or timing issue! Quote Link to comment https://www.bigmacktrucks.com/topic/12460-hard-starting-e6/#findComment-48802 Share on other sites More sharing options...
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