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Unread 05-27-2013, 06:50 PM   #1
bluedevil4
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1991 YJ Wrangler 
 
Join Date: May 2013
Location: Hiram, GA
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No one has been able to help me yet.....

https://www.youtube.com/watch?v=QV7ziIGLbbo

This is a video of my 1991 Jeep Wrangler YJ with the 2.5L engine, manual transmission. This is how my problem started:

I was doing about 65 down the interstate. Once I hit the off-ramp, my Jeep gave out. I was able to start it back up, but it started to run differently. When I would reach higher rpms (3000-3500) it would start to make a sort of grinding sound. A week or so later, I had my son press the gas a little while I was under it to check something. He pressed a little too hard and it just quit and it hasn't started since. The video shows what my Jeep is doing. Now, on to what I have done to it to try to fix the problem.

- New battery
- New battery cables
- New starter
- New rotor button
- New crankshaft sensor
- New spark plugs

Please, any help would be awesome. No one has been able to help me so far. Thanks in advance.

-Brad D.

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Unread 05-27-2013, 07:01 PM   #2
rykemc
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Had problem loading the video but you might want to check and see if the timing jumped or not. That would be the timing chain.
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Unread 05-27-2013, 08:18 PM   #3
superj
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Video is a no-go
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Unread 05-27-2013, 08:20 PM   #4
Anticanman
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Didn't work here either.


Are you throwing any codes?
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Unread 05-27-2013, 08:23 PM   #5
DirtKar
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Video is set to 'private'.
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Unread 05-27-2013, 08:24 PM   #6
Reno72
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1992 YJ Wrangler 
 
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Video didn't work. Have you checked for a spark at the plugs? If not, that is where I would start and work back. If you have good spark at the plugs go to the fuel starting at the carb and working back.
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Unread 05-27-2013, 08:54 PM   #7
bluedevil4
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Sorry, I fixed the video. I do have spark and I do have fuel to my fuel rails.
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Unread 05-28-2013, 07:01 AM   #8
Que89YJ
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It sounds like the timing jumped. Pull your timing chain cover and check your chain or you can do it old school and see how much slack you have by using a wrench on the crank shaft pulley. Pull the distributor cap and move the crank until the rotor starts to spin in the distributor. Spin it in the opposite direction and the difference is the amount of slack in the chain. You shouldnt be able to move it more then a 1/4". If you can then your chain was loose and its the timing chain.
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Unread 05-28-2013, 10:19 AM   #9
superj
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dude, your battery is almost dead.
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Unread 05-28-2013, 03:49 PM   #10
idaholtby
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Quote:
Originally Posted by Que89YJ View Post
It sounds like the timing jumped. Pull your timing chain cover and check your chain or you can do it old school and see how much slack you have by using a wrench on the crank shaft pulley. Pull the distributor cap and move the crank until the rotor starts to spin in the distributor. Spin it in the opposite direction and the difference is the amount of slack in the chain. You shouldnt be able to move it more then a 1/4". If you can then your chain was loose and its the timing chain.
^^ agree with this scenario. I can hear the soft, hallowed "poofing" sound in your vid while cranking that occurs when the valve train is not sealed on compression. Especially given that this happened while going onto an off ramp. A slack timing chain will easily jump on deceleration.
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Unread 05-29-2013, 08:43 PM   #11
bowtech
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1992 YJ Wrangler 
 
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Start with the timing chain. Pretty sure that will be the culprit. As mentioned they love to jump on deceleration.
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Unread 05-30-2013, 09:51 AM   #12
Siva283
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After timing check for fuel and spark. If you have both it may be time for a compression test. Assuming it isnt one of the prior 3
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Unread 05-30-2013, 06:43 PM   #13
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Where did you buy the new CPS? They have been known to be bad out of the box. Check your codes. There's a section in the FAQs to tell you how to do it.
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