Question about 1989 Jeep Wrangler

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Engine Diesels straight 4cyl 2.5l continues to turn over after shutting down. Plugs, Timing, Timing chain, Idler control, Spray pattern all check and looked fine. Checked to see if fuel was stopping after shuting down and it cuts off as advertised. Need to know what else might cause this problem.

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Hi! May I suggest de-coke? I know in modern times fuels are refined better but you may be running a little too rich on one or more cylinders so flecks of soot remain glowing causing run on detonation. Maybe a fuel additive or neat RedeX?
Hope this helps?
Paul 'W'
Onyer~Edson(:0~[><

Posted on Dec 04, 2008

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  • 1

    Place a drain pan underneath the radiator. When the engine is cool, drain the cooling system from the radiator into the pan.

  • 2

    Place a car jack underneath the oil pain to support it. Also, to protect the engine parts, put a block of wood onto the jack.

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    Turn the crankshaft pulley in a backward motion until it rotates 20 degrees.

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    Remove the water pump, throwing away the old o-rings. Make sure not to let the water pump hit the timing chair.

Install the New Water Pump
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    Install the new water pump with the new o-rings, tightening the bolts to 75 to 95 inch pounds (8.5 to 10.7 Nm).

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    Add the drive belts, the idler pulley bracket and the engine mounting bracket with the engine mount.

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    Reinstall the negative battery cable and remove the jack from under the engine. Install drain plugs to the cylinder block.

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1 Answer

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I would check the oil pressure of the engine. The reason is the timing chain tensioners are run with oil pressrue. I think your timing chain tensioners are leaking down when engine is getting to operating tempature . The oil is thinning down as warms up , as it should to lubercate . I would check compression and do a cylinder leak down test on all the cylinders. Then if the compression is good and the cylinder leak down is good. I would change all the timing components, ( chain, timing gears, timing chain tensioners )

Good Luck , I hope this helps.

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1 Answer

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unfortunately you do have to tear it all down, but it's not as bad as it sounds. the 4cyl is easy to work on. you don't have to put it all back together to find out if timing is correct. if you have a good fully charged battery just run the engine with only the timing belt attached. (of course be absolutley sure to keep tools, engine pars, and hands clear!)

put on the parking break and the trans in neutral

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remove or losen the idler pully

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tighten idler pulley

run engine. it should be fairly obvious if it's too advanced or lagged when you give it some gas.

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It is possible for the vehicle to run perfectly fine before turning the engine off. I have seen it happen and it took me quite a while to figure it out. I would never have thought it was the timing chain until I tried to move the distributor and it kind of started. Thats when I figured out that it was the timing chain. If your vehicle has a distributor, mark the position that its in now and then loosen the bolt holding it down and turn the distributor either way and see if it will start or want to start better. Or you can set your TDC on cylinder #1 and check where the position of the rotor is under the cap. theses procedures are a little easier than taking the timing cover off and checking it that way.

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