Died on highway this morning - Page 2 - JeepForum.com
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post #16 of 29 Old 07-18-2008, 09:52 PM
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Hope its not the timing belt ... same thing happened to my car, driving along the highway ... then BOOM dead ... wouldnt crank over and it was the timing belt ...

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post #17 of 29 Old 07-20-2008, 02:04 PM
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just replaced:


engine turns over, belts, fan all turn, rig just won't start. I can smell gas getting to injectors, so I'm really just going to concentrate on electrical right now. I am not getting spark from coil to wire.

I also have a spagetti mess leading into the power block/relay on the firewall. All wires look connected, I just wasn't sure if one of these leads would contribute to problem.

I am considering buying the complete new wiring harness from JC or Quad...and suggestions?

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post #18 of 29 Old 07-20-2008, 05:07 PM
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Originally Posted by blue1989yj View Post
My 89 died on the way top work this morning. One minute I was cruising at about 65, then the engine hesitated, lost power, and quit. It would not restart. I recently nuttered and set timing between 8-9 degrees before. It had never run as smooth as this. It was towed back to the house, where it will sit until I can come up with a fix. Any thoughts? Thanks.

Just did new oil, filter, plugs, as well.
Check for spark if you have none then it is probably the coil. If it has spark it might be no fuel.
Have your buddy turn your engine over while you put a shot of starting fluid or a spray of gas into the intake. If it runs and dies it is a fuel problem, change the inline fuel filter that is mounted on the frame rail and check to see that no other filter is located anywhere between that filter and the carb especially right where the fuel line screws into the carb, and try her again after the filter change(s). If it still won't start and you still have a good spark then you most likely have a bad fuel pump.

Pull the fuel line off of the carb, put the end of that line into a bucket and try turning her over again. You should get a strong stream of gas into the bucket. If not then your pump is NG and needs to be replaced.

IF it is not a fuel problem I also do not think it is the timing chain because if they break it immediately shuts down there is no cough and die it just shuts down like you threw a switch.
Let us know what you find, OK?
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post #19 of 29 Old 07-24-2008, 08:21 AM
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Anybody have this issue? Next step will be to see if there are any bad fusible links in ingnition circuit.

this is so annoying. About to pull trigger on a complete aftermarket wiring harness
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post #20 of 29 Old 07-24-2008, 03:17 PM
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I had the same thing happen to me out in the trails.. Was a relay to the ignition. Would crank and crank but no fire. I thought I had lost a fuel pump.

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post #21 of 29 Old 07-24-2008, 06:45 PM
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if your not getting spark from your coil then use a volt meter and see if your getting power. no power then go further back in the wiring ignition, silenoid, fuse. lots of hair pulling, tool throwing, beer drinking, swearing, and eventualy it will start. haha good luck.
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post #22 of 29 Old 07-24-2008, 07:54 PM
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spanky run a hot wire directly from the battery to the coil + and see if it will start. If so then you are not getting power to the coil from the regular circuit. By the way if it does start this way you will need to yank the wire to shut it off.
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post #23 of 29 Old 07-25-2008, 10:37 AM
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I have been having the same issue. It happened nearly everyday for awhile - restarting after 5, 10, or 15 minutes. It stopped for awhile but has returned. It is more sporadic now, but still happens a couple of times a week.

I am looking at the Crankshaft Position Sensor. The sensor relays information to the ECU and is one of many things necessary to make the engine run. If it fails the engine will stop. Problem is that 15 minutes later it could start again and not happen for days, thus making it difficult to troubleshoot. According to my repair guide 87-95 models all have this sensor. It's a $40 part and a single bolt to replace. After I change it out I'll let you know if it fixes the problem.

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post #24 of 29 Old 07-25-2008, 02:09 PM
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Just installed my new trans and everything strarted up great! It ran for two days parked it and now will not fire up. Have spark, and fuel but no answers. I hope it's mispluged CPS that's it...

Gas first... Question it later!
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post #25 of 29 Old 07-25-2008, 08:16 PM
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My jeep had some issues where it would not start but would crank without turning over. It is fuel injected so this might not help but I could not tell if there was gas getting to the engine (could not smell it at all). I replaced the fuel filter but it turned out to be a bad relay. Not sure which one but it cost like $5.

Worse comes to worse...you have a new relay.
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post #26 of 29 Old 07-26-2008, 09:05 AM
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Originally Posted by bunkrdfool View Post
Hope its not the timing belt
Probably not ... 2.5/4.2/4.0 all have timing chains ... very easy to change as well but you would hear it slapping before it goes for a few thousnad miles and massive noise upon breakage.
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post #27 of 29 Old 07-28-2008, 03:12 PM
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Replaced my CPS, spark plugs, and fuel filter yesterday. I can get a couple of cylnders to fire after crankinging the motor over for ever and then nothing again. I thinking of going one of two directions. One is replacing the fuel pump thae still works with the idea that it's not makeing enough pessure for the fuel rail. The second is going next down the sensor game and replaceing the ECU because I have spark and can smell fuel after cranking it over for ever. They will cost about the same but man dropping the tank would be a pain in the butt! Help!!!

Gas first... Question it later!
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post #28 of 29 Old 07-28-2008, 11:27 PM
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How much pressure do you have in the fuel rail? If it squirts out with any force, you can bet you have enough pressure to start the jeep. Borrow another ECU from someone and see if it works?
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post #29 of 29 Old 08-13-2008, 01:01 PM
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Finally got her up and going again! I when piece by piece and the last thing before buting a ECU was replacing the coil. Once I took it out there was a crack going through the two mounting pionts. I would get spark to the plugs just not enough. Once replace it fired up in seconds.

Gas first... Question it later!
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