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  #1  
Old 02-09-2015, 12:04 PM
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Unhappy jeep starting problems

I've been having this issue with my 2001 JGC 4.7 V8..
seems like this usually happens during the cooler months Dec-March and NEVER over the summer. PROBLEM: after the Jeep has sat overnight, it starts in the morning just fine. But anytime after that during the day, if I shut it off it doesn't want to start back up right away. It cranks, just wont kick in. It might take 3 times trying, or it might take a dozen. Just the other day it took me nearly 20 minutes to get it to run and then yesterday it fired up after 2 tries. I finally decided to do the key dance just to see what would come up and the only codes I have is 455(which has been there for quite some time so I'm sure that's not related) and then this INVALID SKIM code. I have NEVER seen this code on my jeep before even though I have had this no start problem before. Like last winter. I'm going to assume the INVALID SKIM has something to do with some of the times I couldn't get it started after multiple tries....someplace on the forums I read that I may have created a lock out? by attempting to start too many times. At any point....I have this problem and I have this code. Is this going to be one of those deals where it may be the crank position sensor? Would my mechanic be able to find a code for that using an actual code reader? Only good thing is, gas is cheap right now so I can leave it locked and running if I'm just making a quick trip into a business. :-) I have both sets of keys and key fobs. Ive tried using both....does the same with both keys so I can rule that out. One thing I do notice is when it's in it's no start temperment, the battery gage seems slow coming up. Interstate battery is 2 years old, I put new alternator on last spring....has auto tensioner on it so I'm sure the belt is tight....and besides, it didn't do this over the summer...only during winter months.

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  #2  
Old 02-09-2015, 02:50 PM
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Re: jeep starting problems

If the problem was an invalid key (or at least it doesn´t see a valid key), then it should just start up without a problem, but it would shut down after a few seconds. If it doesn´t fire up at all, the problem seems to be something else.
Could be a crank sensor or cam sensor, but also one of the other sensors. Indeed best is to put it on a scanner to check if there is no other code, eventhough the keydance should show it. I would also errase the codes and see if they come back, just to see if they are actual faults.
If you crank it and it doesn´t want to start, do you see the rpm pointer moving a bit? If it does, then the crank sensor is ok. Let your mechanic check the MAP sensor via his scanner, to see if a reasonable pressure is shown. I would also ask him to swap the auto shutdown relay with the transmission control relay. If the relay is faulty, then the transmission will go into limp mode, but at least you know that the relay is the problem and must be changed.
Also a next time it doesn´t want to start, let someone stay close to the exhaust, to smell for fuel (or lack of it).
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Old 02-21-2015, 03:21 PM
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Re: jeep starting problems

well, over the past few days the jeep has been in the shop getting new rear axle seals done and rear brakes. As is ALWAYS the case, the jeep started every single time for the mechanic. GO FIGURE!! haha. he did also tell me to watch the rpms when it doesn't want to start and see what they do. As far as exhaust goes, well, ,my jeep is quite the oil burner these days so my exhaust is always not normal. But whens she's running...she's running great!! Where are those two relays? in the fuse box under the hood? If it ever gets in it's mood again and not want to start, can i switch them then and see if it fires up? For now, I just have to wait til it acts up again and go from there.
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Old 02-21-2015, 09:09 PM
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Re: jeep starting problems

Yes, both relays are in the fusebox under the hood (called PDC= power distribution center). You can easily swap those two relays when the problem is back.
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Old 02-23-2015, 08:37 AM
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Re: jeep starting problems

okay, another day and again, the jeep didn't want to start. what i did is first look at rpm's when trying to start...nothing. the needle didn't even think about moving. Second, i swapped the two relays, auto shut down and tcm since they are the only two that are the same. guess what. jeep fired right up. so what is this telling me? I have a bad relay and that's all there is to it?
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Old 02-23-2015, 09:17 AM
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Re: jeep starting problems

It indeed could be the autoshutdown relay. If it is the relay, you can expect problems with it in the transmission control relay position where it is now. It would mean that if the relay doesn´t work properly, that the transmission will go into limp mode and stay fixed in 3rd gear with shifter in D. Reverse will still work and when selected manual 2, 2nd gear will work. It will at least not let you stranded somewhere. If the starting problem doesn´t return over the next weeks, i would advise to change the relay with a new one.
I´m only not sure if the auto shutdown relay doesn´t work, if you then don´t get rpm indication. The autoshutdown relay cuts power to ignition coils and fuel injectors, but there is also an input to the PCM.
Well, only time will tell.
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Old 02-23-2015, 09:47 AM
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Re: jeep starting problems

jeep seems to be shifting fine but i just picked up a new relay to put in just in case it's faulty or intermittent for some reason. it was only $6 so not a big waste of money if that's not the problem. this relay, by the way, was replaced a few years back also. hmm. seems odd i would have to replace it once, let alone twice in a few years time.
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Old 02-23-2015, 10:26 AM
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Re: jeep starting problems

What previously happened that you had to replace the relay? Maybe some inferior brand relay? It can be that the relay solenoid still works ok, but that the relay contacts burn and cause a too high resistance.
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Old 02-24-2015, 02:03 AM
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Re: jeep starting problems

I cant remember, was a few years ago. well later today, had another "no start" only this time it seemed even worse! previously when it wouldn't start but turned over, it just seemed like it wasn't getting gas(like the old cars when you'd have to pump the gas pedal to get it going in the winter.lol)...like it was trying to start,, just not "kicking in", if that makes any sense at all. But this time, it turned over, didn't seem like it was even thinking about starting...reminds me of how they do when the timing slips or fuel pump is bad....that kind of crank. it still though, does eventually start. key dance still only shows 455 for emissions. Mechanic said next time it doesn't start right off to call him and he will bring his scanner over to check it out. so frustrating when its below freezing to have to f*** around with a randomly starting vehicle. :-(
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Old 02-24-2015, 06:13 AM
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Re: jeep starting problems

It probably is a bad sensor, but without a code it will be shooting in the dark. When the problem is there, the several sensors should be checked with a scanner which shows live data. The number one input for fuel injection is the MAP, but also inlet temperature sensor is an important input. But first you will need to find out if the problem is fuel or ignition related. Hopefully your mechanic will find something with his scanner.
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