mknherhappy Posted September 6, 2008 Share Posted September 6, 2008 Changed the plugs, wires, rotor, and cap. Still turns over several times before firing. Does start every time, but, would like it to fire quicker. Any ideas or suggestions? Thanks again for your help. Link to comment Share on other sites More sharing options...
jeep_freek88 Posted September 6, 2008 Share Posted September 6, 2008 Mine Does the same thing. Turns over like 3 to 4 times and fires up even in sub zero temp, maybe its normal but Idk. :roll: Link to comment Share on other sites More sharing options...
jtdesigns Posted September 6, 2008 Share Posted September 6, 2008 Its just the way these trucks are. The ecu has to relearn everything and start from scratch. You could try replacing the crankshaft positioning sensor with the one that wires directly to the ecu, but it will still take a few turns crank. Link to comment Share on other sites More sharing options...
FxRacing282 Posted September 6, 2008 Share Posted September 6, 2008 its a jeep thing, be proud. Link to comment Share on other sites More sharing options...
jeep_freek88 Posted September 6, 2008 Share Posted September 6, 2008 Its just the way these trucks are. The ecu has to relearn everything and start from scratch. You could try replacing the crankshaft positioning sensor with the one that wires directly to the ecu, but it will still take a few turns crank. Yea thats what I figured too just because it starts the same in the freezing cold weather These trucks rock :agree: F-U banana Link to comment Share on other sites More sharing options...
fiatslug87 Posted September 6, 2008 Share Posted September 6, 2008 I've had a '90 MJ since it was new. From day 1 it took a couple of turns before it would start. As stated previously, it's just the way they are. Link to comment Share on other sites More sharing options...
BLHTAZ Posted September 6, 2008 Share Posted September 6, 2008 It is completely normal for any pre-HO 4.0L to take several turns before firing. :cheers: Mine had new plugs, wires, cap & rotor when I bought it and I replaced the injectors and the IAC shortly after getting it...it still takes several revolutions to get going. Link to comment Share on other sites More sharing options...
ejndssn Posted September 7, 2008 Share Posted September 7, 2008 i'd called it foreplay :rotf: its just take a bit to get these started but its all fun after that :brows: Link to comment Share on other sites More sharing options...
maddzz1 Posted September 7, 2008 Share Posted September 7, 2008 I was always turn my key to the run position until I hear the fuel pump prime before i turn the key to start. It seem to start a little faster. Link to comment Share on other sites More sharing options...
chicofuentes0224 Posted September 7, 2008 Share Posted September 7, 2008 Jim, did you ever get the negative battery cable with the extra body ground? Link to comment Share on other sites More sharing options...
maddzz1 Posted September 7, 2008 Share Posted September 7, 2008 Jim, did you ever get the negative battery cable with the extra body ground? Not yet, I will probally pick one up next week when i stop at the auto parts store. I am hopefully getting my ball joints and axle u-joints done next week too. Sorry for the hi-jack. Link to comment Share on other sites More sharing options...
chicofuentes0224 Posted September 7, 2008 Share Posted September 7, 2008 Jim, did you ever get the negative battery cable with the extra body ground? Not yet, I will probally pick one up next week when i stop at the auto parts store. I am hopefully getting my ball joints and axle u-joints done next week too. Sorry for the hi-jack. Actually Jim, we're not hi-jacking. I know almost everyone on this forum has a problem with hardstarting. I changed every sensor and "tune-up" part on my MJ. Nothing made a differnce. That is until I put a negative battery cable on that had a second wire running from the negative post of the battery to my fender for ground. My truck went from turning over 4-5 times before starting to starting instantly every single time. Maybe it was a fluke but I'd like to know if anyone else had a similar experience. I'll take a pic tommorow in the daylight to show you guys what I have. Link to comment Share on other sites More sharing options...
ejndssn Posted September 7, 2008 Share Posted September 7, 2008 hey chico where did you get the negative battery cables from i'm looking into replacing all mine here in a few days and looking for some good replacements "I'm thinin that http://www.geocities.com/JeepI6Power/ might be the place to get them unless there are others sources other than autozone & advance. just a thought. :hmm: Link to comment Share on other sites More sharing options...
chicofuentes0224 Posted September 7, 2008 Share Posted September 7, 2008 ej, I got the cable at Autozone. Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 7, 2008 Share Posted September 7, 2008 Hard starting is not strictly a Renix thing. I usually start much quicker when cold than when hot, but it's not all that consistent. It's almost like vapor lock. When stopping for a short time, it takes twice as many turns to start when hot, but vapor lock is a carb thing. Keeping underhood temps down usually helps on hot starts, so I'm hoping the new hood vents will help. Link to comment Share on other sites More sharing options...
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