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  #1  
Old 01-21-2016, 10:33 AM
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Question No crank issue

Going to try and make a long story short...2001 JGC 4.7 178k has sat for the better part of a year and a half in my driveway I drove it about 2 times in that span.Needed new front axles,power steering pump again,all new brakes and rotors and a list of other things that would cost me $2k +.So on Monday I had installed a new battery and it fired right up and I dropped it off to my mechanic.After about 2 hours he called me as he was going to move the Jeep into bay and he asked was there an alarm or something special he needed to do as it would not start..no crank at all.I of course tell him no it usually just starts via key but that a few times in the past it would do this and by using my remote start it will work.He tried that and it worked.Fast forward to yesterday he completes the important things I needed repaired and did a electrical system analysis,thoroughly went over vehicle and has had no issues with starting while in his shop.I pick it up and since it has sat my inspection sticker is bad so I take a nice long drive about 45 minutes to DMV to get it inspected.Pull in and the guy has me shut it off and exit vehicle.Two minutes later he walks over to the booth I am waiting in and asks about an alarm or something as he can't get it to start.I go over cursing to myself and turn the key and get absolutely nothing.I try turning key a few times but there is nothing happening.I try remote start still nothing.I try the key one more time...this was in about a 2 minute span...and it turns right over.I look at this old guy and say not sure what that is about and he looked a bit confused as well and I tell him just leave it running.He runs his tests,trucks passes emissions,and he pulls forward to the bay exit to scrape and apply new sticker and the f'kn idiot turns it back off.He applies sticker waves me over and walks away.Now I turn key and nothing.Tried multiple times via key and remote..tried locking doors unlocking exiting vehicle and hitting remote and nothing is working.For 5-10 minutes I am trying and this guy walks back over with the next vehicle ready to leave behind me and says you need to move.I tell him it won't start again and I told you not to shut it off as you just saw what happened a few minutes ago but he just looks at me stupidly.So now a few others come over to see what the problem is they try the key to see whats happening and still no cranking no nothing.Everything is functioning inside as far as lights,radio etc.They decide to just push it for me.4-5 guys behind the Jeep and woman in the seat and its in neutral...will not move.Another guy jumps in seat to shift it back into park and go into neutral again and not they push and it will not budge.I have to call and get a flatbead to get it out of the bay asap and so I do that.Now when the truck gets there he hooks the pully up and puts it in neutral and he pulls it onto bed and now the tires are rolling.I am now there with the Jeep for another hour and trying to start it every so often but getting nowhere.I disconnected battery in hopes that might help something but nope.He lets car off bed as now I have to get someone to come back with me with AAA so I can have it towed to my mechanic.So now its 4pm and I get picked up by my girlfriend and we had someplace to go so it was going to be a few hours before we would go back to meet AAA to get it towed.I return at 6:30pm as tow truck is expected around 6:45 and I figure let me try to start it...it fires right up.I proceed to shut it off and on about 10 times and no issues.Drive it home and shut it off and it fires right back up.This morning I have not driven it but it will fire right up remotely.
The battery is a week old,the starter,fuel pump,ignition switch are all less than 4 years old and based on the electrical test they all seem fine.I have never had issues with the transmission as far as going through into reverse or neutral..I am completely baffled as to what would cause the truck to not start and then to not roll while being placed in neutral.I guess my important questions are:

1.What could cause the truck to not start back up after previously running?
2.If related to the startup issue why would the truck not roll in neutral?
3.Would immobilizer cause the wheels to lock up like that and not crank?
Like I said I am baffled and wondering is it electrical? Is it the remote start f'king with the starter and computer? Is it the factory alarm causing it? What could happen in that 2 hour span or so that would suddenly allow the truck to start right up? Any thoughts or ideas or questions that might lead me in a direction are greatly appreciated! Thanks for taking the time to read this

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  #2  
Old 01-21-2016, 11:02 AM
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Re: No crank issue

Ignition cylinder tumblers are worn. This will cause sporadic crank and also keep trans locked. Try this, really...with key in ignition tap (firmly) the end of the key with something solid. A couple firm "raps" straight in on the end of the inserted key will cause the worn tumblers to jostle into position and then all is good. I did this on my '02 4.7HO until I felt like ordering the new cylinder. Happened at about 150k for me.

This is my guess, let us know how it sorts out....
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Old 01-21-2016, 04:08 PM
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Re: No crank issue

Quote:
Originally Posted by 14SummitHemi View Post
Ignition cylinder tumblers are worn. This will cause sporadic crank and also keep trans locked. Try this, really...with key in ignition tap (firmly) the end of the key with something solid. A couple firm "raps" straight in on the end of the inserted key will cause the worn tumblers to jostle into position and then all is good. I did this on my '02 4.7HO until I felt like ordering the new cylinder. Happened at about 150k for me.

This is my guess, let us know how it sorts out....
Thanks for responding.I will keep that in mind though I would think if that were the issue then remote start would still work.Has started today every time though I only drove it one time locally and left it running .Sorta hoping it happens again as it's not easy figuring about what's broke when it isn't broken at the time.
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Old 01-21-2016, 04:20 PM
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Quote:
Originally Posted by Joe's2001Laredo View Post

Thanks for responding.I will keep that in mind though I would think if that were the issue then remote start would still work.Has started today every time though I only drove it one time locally and left it running .Sorta hoping it happens again as it's not easy figuring about what's broke when it isn't broken at the time.
If the key turns when it won't start then its not the tumblers.
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Old 01-21-2016, 04:31 PM
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Re: No crank issue

OK,yes the key turns.
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Old 01-21-2016, 11:08 PM
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Re: No crank issue

Wow, i wonder how your story would be if you didnīt try to make the long story short? Almost fell asleep halfway.
Ok, lets try to help you. If you try to start, but it doesnīt crank, do you hear the fainth click of the starter relay in the PDC under the hood? If you do, then check the thin wire which goes to the starter motor solenoid for good contact.
If no click at all, then first swap the starter relay with the horn relay in the PDC and see if that makes any difference. If still no crank, then move the shifter lever out of Park to Neutral. A badly rigged park/neutral switch will prevent the starter relay to be energized. If this also doesnīt help, then it is possible that the Park/Neutral position switch is getting bad. This switch is part of the TRS/solenoid block and sits inside the transmission, on top of the valve body. Measuring continuity of this switch circuit can be done from the starter motor relay slot 85 to ground. In park and Neutral there should be continuity.
If this is the problem, then you can bypass the switch with a wire between slot 85 and ground, but this is only to not get you stranded. Because in this way you can start the engine with the shift lever in any position, so will have to be carefull what you are doing.
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Old 01-22-2016, 09:20 AM
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Re: No crank issue

Quote:
Originally Posted by Frango100 View Post
Wow, i wonder how your story would be if you didnīt try to make the long story short? Almost fell asleep halfway.
Ok, lets try to help you. If you try to start, but it doesnīt crank, do you hear the fainth click of the starter relay in the PDC under the hood? If you do, then check the thin wire which goes to the starter motor solenoid for good contact.
If no click at all, then first swap the starter relay with the horn relay in the PDC and see if that makes any difference. If still no crank, then move the shifter lever out of Park to Neutral. A badly rigged park/neutral switch will prevent the starter relay to be energized. If this also doesnīt help, then it is possible that the Park/Neutral position switch is getting bad. This switch is part of the TRS/solenoid block and sits inside the transmission, on top of the valve body. Measuring continuity of this switch circuit can be done from the starter motor relay slot 85 to ground. In park and Neutral there should be continuity.
If this is the problem, then you can bypass the switch with a wire between slot 85 and ground, but this is only to not get you stranded. Because in this way you can start the engine with the shift lever in any position, so will have to be carefull what you are doing.
Ha yea that is a shortened version...Yes I did hear clicking from the starter relay.2 problems, it's now starting every time I try and the second being I am not comfortable messing around with electrical stuff.There's a potential blizzard coming tonight into Sunday but on Tuesday or Wednesday I am having the PS reservoir changed and I am going to have him look at everything again so will hopefully know more then.Thank you for responding and any more suggestions are greatly appreciated as I will pass them along
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Old 01-22-2016, 01:45 PM
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Re: No crank issue

So the starter relay working at least means that the ignition switch is working and the Park/Neutral position switch is ok as well. If the problem returns, i would first swap the starter relay with the horn relay and check the wire on the starter solenoid.
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Old 01-22-2016, 03:20 PM
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Re: No crank issue

Ok.Still starting without any issue but I am gonna go take it for a decent local drive to and then come home and shut it off and see what happens
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Old 02-17-2016, 07:44 PM
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Re: No crank issue

Just updating.So since my last post I hadn't had any issues until this past Friday night.This time no crank but unlike the last time I didn't have any lights or radio etc. and I for some reason was unable to get the doors to lock or unlock via the fob.I tried the key a few times and tried the remote start but nothing happening.I had locked the doors from inside and stepped out of the jeep and hit the unlock on the fob and it wouldn't work.So now I am locked out and the key wouldn't unlock the drivers door.I went to the liftgate as it does not lock back there so I could get in.I stood there for about 30 seconds contemplating opening gate as I know the f'n alarm is gonna go off so I hit the unlock on the fob and I hit the remote start button again in frustration.Within seconds the horn beeps twice and the truck fires right up.I go to drivers door and its locked but now the fob works an the unlock button opens them up.I'm at a loss...
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