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Old 08-03-2010, 09:39 PM   #1
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99 TJ starts, runs for about 3 seconds and dies.

Hello all. I'm Dave. We have a '99 TJ with the 4.0L that I drove to work this morning and this afternoon I try to start it and it would run for about 3 seconds and die. Thats all it will do now. Could it be the fuel pump or maybe the security system? I did notice a yellow flashing light on the instrument panel with a key with a line through it or a X across it. I haven't noticed that light before.

I can keep it running by continuously pumping the gas pedal but it's rough. Thanks for your help. Dave

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Old 08-03-2010, 10:15 PM   #2
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First thing I would do is find out what that flashing light is...if it's a check engine light, it's throwing codes and those codes can help you/us figure out the problem for sure.

If it stays running by pumping the gas pedal, I don't think it's the fuel pump.

I'm guessing either a problem with the distributor/ignition coil or a sensor...but those are just complete guesses.

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Old 08-03-2010, 10:53 PM   #3
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This may sound stupid,but what color key do you have?Black or grey?Sounds like a transponder problem to me.
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Old 08-04-2010, 01:27 AM   #4
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That flashing key is telling you the sentry key system is working and telling you that the wrong key is being used. That doesn't mean you have the wrong key but the system thinks you do and until you make it happy it won't run.
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Old 08-04-2010, 04:21 AM   #5
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About two weeks ago I was doing some work on my jeep and let the battery drain (by accident). When I went to jump it, it would only run for a few seconds and stall. So I kept my foot on the gas and drove it around for bout 20 minutes, got about three miles of highway driving and it worked fine ever since. Had to let the alt charge up the battery enough. Just a thought. Maybe batt/alt isn't working properly? Mine is also a 99 btw.
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Old 08-04-2010, 06:23 AM   #6
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If you have the flashing key/ light, your system is not recognizing the key as programmed. Have you recently replaced or damaged the key?
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Old 08-04-2010, 06:30 AM   #7
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Okay thanks for the replies. I also don't think it's the fuel pump. I was able to keep it running this morning by getting it up to about 2000 rpm and turning the key off and back on repeatedly. It lets it repressurize the fuel rail.

I unhooked the battery cable from it this morning and I'll let it set all day and see if it will do anything different when I get home.

I'm going to see if I can find a loaner code reader if its still doing it..

The key is gray.

If it is the sentry system, is there anything I can do to reset it or is that a dealer fix?

I'll also check the battery voltage this evening.

Thanks again for the replies. It gives me a starting point. Dave
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Old 08-04-2010, 06:33 AM   #8
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Quote:
Originally Posted by JDsDream View Post
If you have the flashing key/ light, your system is not recognizing the key as programmed. Have you recently replaced or damaged the key?
Not that I am aware. I drove it to work yesterday morning and it ran fine. I tried the 2nd key in it last night and it does the same thing. Dave
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Old 08-04-2010, 06:58 AM   #9
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I found this in another thread. Probably not much help, but it does explain the system.

SENTRY KEY


The Sentry Key

 Immobilizer System prevents unauthorized

vehicle operation by disabling the engine. The
system does not need to be armed or activated. Operation
is automatic, regardless of whether the vehicle is locked
or unlocked.
The system uses ignition keys that have an embedded
electronic chip (transponder) to prevent unauthorized
vehicle operation. Therefore, only keys that are programmed
to the vehicle can be used to start and operate
the vehicle. The system will shut the engine off in two
seconds if someone uses an invalid key to try to start the
engine.

NOTE:




A key that has not been programmed is also

considered an invalid key, even if it is cut to fit the
ignition switch lock cylinder for that vehicle.
During normal operation, after turning on the ignition
switch, the Vehicle Security Light will turn on for three
seconds for a bulb check. If the light remains on after the
bulb check, it indicates that there is a problem with the
electronics. In addition, if the Vehicle Security Light
begins to flash after the bulb check, it indicates that
someone used an invalid key to try to start the engine.
Either of these conditions will result in the engine being
shut off after two seconds.

If the Vehicle Security Light turns on during normal
vehicle operation (vehicle running for longer than 10 seconds),
it indicates that there is a fault in the electronics.
Should this occur, have the vehicle serviced as soon as
possible by an authorized dealer.
NOTE:





The Sentry Key Immobilizer System is not compatible

with some aftermarket remote starting systems.
Use of these systems may result in vehicle starting
problems and loss of security protection.






Exxon/Mobil Speedpass™, additional Sentry Keys,

or any other transponder-equipped components on
the same key chain will




not cause a key-related

(transponder) fault unless the additional part is




physically

held against the ignition key




being used when

starting the vehicle. Cell phones, pagers, or other
Radio Frequency (RF) electronics will not cause interference
with this system.
All of the keys provided with your new vehicle have
been programmed to the vehicle electronics.
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Old 08-04-2010, 07:12 AM   #10
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Good info. Interesting. Thanks

This our Daughters Jeep. She is stationed in Germany. Active military. Were keeping the Jeep for her and drive it some just to keep it from sittng. We only have the 2 keys. Can the system become unprogrammed from the key or do you think someone may have tried to steal it and it wouldn't let them? Just wondering. Dave
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Old 08-04-2010, 07:19 AM   #11
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Check your SKIM module to make sure the wiring harness is plugged in. It could have come unplugged.


are your keys damaged? If so, this could cause a problem.

Only other thing is is for the dealership to get involved.


You can disable it after you start the engine by unplugging the SKIM module, but it has to be timed correctly. This still might not solve your problem, but checking the keys, the wiring, the antenna for the SKIM, and disabling it is all you can do before paying bucks to the dealership.

Simply unplugging the SKIM won't work. It has to detect a signal and send the info at startup. but if it is working correctly, it can be gotten around.
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Old 08-04-2010, 07:20 AM   #12
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Quote:
Originally Posted by Dave in tn View Post
Good info. Interesting. Thanks

This our Daughters Jeep. She is stationed in Germany. Active military. Were keeping the Jeep for her and drive it some just to keep it from sittng. We only have the 2 keys. Can the system become unprogrammed from the key or do you think someone may have tried to steal it and it wouldn't let them? Just wondering. Dave
No, it cannot be "undone".
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Old 08-04-2010, 07:26 AM   #13
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Check out this link:
1999 Jeep Wrangler Reliability - MSN Autos
Could it be the crack position sensor?
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Old 08-04-2010, 07:43 AM   #14
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I seriously think that it is the onboard security system. what you describe is exactly what happens when you start a Jeep that has a factory Sentry module installed. and the fact that you saw a flashing light of a key with a line through it tells me that is the problem. these units cannot be bypassed. The Jeep and the key both have to match and work correctly when starting the Jeep. If something is wrong on either side, it will do exqctly what you described.


I need to clarify on my previous post: I've only read once where someone has bypassed this and they don't know how they did it. someone else stated they had the same problem and it was the wiring harness. Once they got the vihicle started, they could unplug the SKIM unit and it would be fine, the security check had already been done. They could restart the vehicle with it unplugged if they did not remove the key. so, you have to have a working sentry unit to begin with.

This is the internet so take what people say they've done with a grain of salt.


Also:

http://www.wranglerforum.com/f5/tj-error-codes-358.html


A way to tell what is happening via engine codes.
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Old 08-04-2010, 08:00 AM   #15
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Quote:
Originally Posted by Dave in tn View Post
Check out this link:
1999 Jeep Wrangler Reliability - MSN Autos
Could it be the crack position sensor?
Opps...Typo. Crank positon sensor not crack...lol

Okay thanks PTaylor for the link. I'll check it out too. Dave
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Old 08-04-2010, 11:50 AM   #16
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http://en.allexperts.com/q/Chrysler-...riodically.htm

extract from that page:

Chrysler Repair - Sentry Key system periodically malfunctioning


For the past 8 years, a couple of times a year, I've had a recurring problem on my 2000 Sebring Convertible where the Sentry SKIM system does not recognize the key and shuts the car off a couple of seconds after starting. The owner's manual says if the key isn't recognized, the red anti-theft light in the dashboard should flash continuously, but the light stays off. Removing adjacent keys or other metal object and locking/unlocking the doors has never been a factor.

Usually, I can get past the problem by unplugging the battery and then plugging it back in, so it could be some static charge on the computer circuitry or clearing out some invalid state. Since the battery is quite hard to get to in front of the wheel well, and I usually didn't have the tools with me, a few times I've been able to get it going by just pulling out some fuses in the box under the hood and putting them back in. I think it may have been the ignition ones, but was never sure since I'd just pull a bunch of them and put them back. Only one time did none of this work and I had to tow to one shop and then again to the dealer to get the computer reprogrammed with a new key. Since then it happened again with the battery unplug being required.

It has only happened on hot afternoons (90 degrees plus in Texas summer), which makes sense that it would cause circuit problems but also makes the inconvenience factor much higher! At least a couple of the times it coincided with a weak battery that was ready to be replaced, but it seems odd to me that there would be enough juice to start the car normally but then not enough to have the computer properly function.




also from another site:

I have an 06 2500 Mega Cab Diesel, which has been perfect (except for the lowsy A/C) for 8 months. Today, I start it up, it runs 2 seconds, and dies. Repeat 4 times. I call the dealer and my service writer thinks it is the Sentry Key not working. Confirmed with the fact the red lamp to the lower right of the speedo is ON. So, I get my second key, 2 more starts and stalls, followed by crank/no start. He tells me to remove the battery negative cables to reset the computer. I did, it works fine now.
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Old 08-04-2010, 12:22 PM   #17
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Okay thanks again for the info. It was a near record high here in east Tenn. yesterday too. I did call the dealer and the service dept. knew about what I was telling him about the issue. He has seen it before. He said if reprogramming to computer is all that is wrong with it, it will $70 to fix it. Again thanks for the info and I'll let you all know what the outcome is. Dave
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Old 08-04-2010, 12:52 PM   #18
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Do you have another SKIM (gray) key to try? If the other key works ok that will confirm that the key you are using is the cause of this issue as I suspect it is. And the key you are using when the engine dies is gray or black in color? Is it a recently made copy?
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Old 08-04-2010, 01:30 PM   #19
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Where is the SKIM module located?
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Old 08-04-2010, 09:04 PM   #20
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Do you have another SKIM (gray) key to try? If the other key works ok that will confirm that the key you are using is the cause of this issue as I suspect it is. And the key you are using when the engine dies is gray or black in color? Is it a recently made copy?
I tried both keys which are original to the jeep. There gray. Going to take it to have it reprogramed. Dave
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Old 08-04-2010, 09:08 PM   #21
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Did you try disconnecting the battery to see if it would reset? Just asking.
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Old 08-05-2010, 12:19 PM   #22
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Yeah, I tried that yesterday. Unhook the battery yesterday morning and hooked it back up yesterday evening. Same thing. Got an appointment for tomorrow afternoon. Dave
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Old 08-06-2010, 03:50 PM   #23
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Hey everybody. Just got the Jeep back. It was the sentry system. All fixed. I want to thank everybody that helped me with this issue. Dave
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Old 08-06-2010, 05:46 PM   #24
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Glad to here it. Did they give you any reason why it happened?
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Old 08-06-2010, 10:09 PM   #25
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Nope...They said they didn't know why it happened. Hope it don't do it again. Dave

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