jons87mj Posted May 3, 2011 Share Posted May 3, 2011 it just happend a yesterday what happend? :( Link to comment Share on other sites More sharing options...
tbrand Posted May 3, 2011 Share Posted May 3, 2011 First off, which motor do you have? Second, what is a "long time?" Third, when was the last time a tune-up was done? That'd be my first line of thinking if it's been a while. Link to comment Share on other sites More sharing options...
Garvin Posted May 3, 2011 Share Posted May 3, 2011 Try cycling the key a few times before starting the Jeep up. Turn the key to the on position (not the start position), hold it for a few seconds there, and repeat a few times, then try starting her up. If she fires right up then you have a pressure leak back issue. If that doesn't fix it, check the ignition system and do a tune up if it's been quite a while. Those would be the two areas I'd start at. Link to comment Share on other sites More sharing options...
jons87mj Posted May 3, 2011 Author Share Posted May 3, 2011 sorry its a 4.0 and it takes atlest 7 sec to start befor it would just fire up like it was new i tuned it up at least a mounth ago Link to comment Share on other sites More sharing options...
SubSonic Posted May 3, 2011 Share Posted May 3, 2011 sorry its a 4.0 and it takes atlest 7 sec to start befor it would just fire up like it was new i tuned it up at least a mounth ago 2 things. Try priming the fuel pump by cycling the key a few times before igniting, see if it starts faster. If thats the case you've got a lazy pump. Check/Clean your CPS, (follow the wire that travel over the intake manifold to the sensor on the top, driver side of bell housing) they are known to cause long/no starts as well. Link to comment Share on other sites More sharing options...
jons87mj Posted May 4, 2011 Author Share Posted May 4, 2011 thanks for the replys i went and put on a new cps and it starts like new again thanks again Jon :cheers: Link to comment Share on other sites More sharing options...
comanche12 Posted May 5, 2011 Share Posted May 5, 2011 try fuel pressure-sound like its take an while to build fuel pressure to able fire the engine while cranking? my jeep take an while to crank too but not long as your issue? :dunno: Link to comment Share on other sites More sharing options...
Akula69 Posted May 5, 2011 Share Posted May 5, 2011 Recently I got to play with a Snap-on MT2500 scanner and my Jeeps. It was an eye opener on how the ECM deals with all the inputs from the sensors...but in answer to your question - the 87 was taking about 7-10 seconds to start, and the sensor indicated that the stator (pick-up coil) inside the distributor had switched from sequential injector pulse to simultanous injector pulse. I didn't even know the stator could do that, but the diagnosis codes description said that a symptom was longer cranking times and extremely rich mixtures (bad MPG). The MJ would start and run but the scanner recommended replacement, and when I did it then showed sequential pulse, and the start time dropped to about 3-4 seconds. Just as a side note - the short term ECM fuel adjustment went back to normal as well. Link to comment Share on other sites More sharing options...
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