ratrapp Posted July 18, 2010 Share Posted July 18, 2010 88 4.0 renix.when it's cold or parked overnight it starts right up which kind of eliminates the fuel pump leaking down.i just replaced the crankshaft sensor with the mopar one that straight wires it to the computer.i thought that fixed it but it started doing it again.when i drive it to work and it sits 9 hours before i restart it i have to crank it several time before it fires.it cranks over fine,just won't hit.i even tried cycling the key several times before i crank it to see if it's the fuel pump dropping pressure but it doesn't help.i just replaced the plugs cap and rotor when i replaced the head with a ho model.it done it before i replaced the head so i can't lie fault with that.i have never replaced the coil/module or the pick-up plate in dist. but i did replace the dist about 10 years ago because of corrosion in it.any suggsetions appreciated. Link to comment Share on other sites More sharing options...
comanche12 Posted July 19, 2010 Share Posted July 19, 2010 well possible a spark plug with wrong temp range? like a f40 that have difficult to start up after warm up because of wrong spark plug temp range Link to comment Share on other sites More sharing options...
mvusse Posted July 19, 2010 Share Posted July 19, 2010 Mine used to start just fine after sitting overnight, but had trouble when warm. Ran just fine once started. Turned out to be injectors leaking out into the combustion chamber causing flooding. Replaced injectors and all is fine again. Link to comment Share on other sites More sharing options...
rworks Posted July 19, 2010 Share Posted July 19, 2010 Whats this about a crankshaft sensor that direct wires to the computer? Link to comment Share on other sites More sharing options...
ratrapp Posted July 19, 2010 Author Share Posted July 19, 2010 right range plugs,same champion plugs that i've always run.injectors i may give a try.i've replaced 4 of them but i did ntice that when it's hard to start that it does blow a little black smoke out of the tailpipe when it does finally start like it had lightly flooded.i may start it up and let it run a while and cut it off and pull the rail and injectors out and see if any of them leak gas out.the crankshaft sensor is a mopar piece that they made a tsb for renix style 4.0 that eliminates the bulkhead connector and improves the crank signal but unfortunatly that wasn't my case. Link to comment Share on other sites More sharing options...
comanche12 Posted July 19, 2010 Share Posted July 19, 2010 hmm interesting time to think whats would it cause hard to start after warm up :smart: Link to comment Share on other sites More sharing options...
ratrapp Posted July 19, 2010 Author Share Posted July 19, 2010 did notice this afternoon when i went to leave work that i slightly held the throttle open and it cranked right up.need to do more investigation. Link to comment Share on other sites More sharing options...
rworks Posted July 19, 2010 Share Posted July 19, 2010 Where can I get that piece that re-routes the CPS connector? Linky please please please. Link to comment Share on other sites More sharing options...
ratrapp Posted July 19, 2010 Author Share Posted July 19, 2010 when i go to work tommorow i'll get the mopar part# off the box for you.i ran it through my shop account and it cost me about$89.try to run it through a garage account and save yourself some money. Link to comment Share on other sites More sharing options...
ratrapp Posted July 20, 2010 Author Share Posted July 20, 2010 the part #for the a/t kit is 83-100-066 and for a manual is 83-100-063 Link to comment Share on other sites More sharing options...
rworks Posted July 20, 2010 Share Posted July 20, 2010 the part #for the a/t kit is 83-100-066 and for a manual is 83-100-063 Awesome. thank you so much. Link to comment Share on other sites More sharing options...
tj21 Posted August 8, 2010 Share Posted August 8, 2010 Did you solve this? I have the same problem with my 2.5L. My TBI fuel injector is spendy to replace, so I don't want to do that until I know its needed. Link to comment Share on other sites More sharing options...
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