Question about 2000 Jeep Grand Cherokee

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Engine missing. replaced spark plugs, coil rail and still missing. when you rev it i can hear a rattle like lifters floating. any ideas?

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  • gball60 Jul 02, 2009

    I CHECKED THE FUEL PRESSURE AND IT HOLDS A STEADY 51 PUONDS WITH NO CHANGES WHILE ITS MISSING.

  • gball60 Jul 03, 2009

    not the problem. checked about all i know to check. had it put on computer. it said to replace plugs- did that, coil packs-did that,fuel pressure 51 lbs,it said it was missing on random cylinders, can't figure that one out.

  • gball60 Jul 03, 2009

    ANY IDEA WHAT THE FUEL PUMP PRESSURE SHOULD BE? I CHECKED IT ON THE FUEL RAIL AND IT HOLDS A STEADY 51 POUNDS. I HAVE SEARCHED SEVERAL PLACES AND CANNOT COME UP WITH A SOLID NUMBER.

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Bad plug wires also cause a miss, replace the plug wires.

Posted on Jul 03, 2009

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Get the fuel pump checked that is the only thing I can think of as you have replaced all the parts which could be possibile caues missing. Now the second part of the question, missing has nothing to do with the sound created while reversing.
THere are 2 possible causes for this type of complaint; you may need to do a little investigating to find the actual source of the noise.
(1) The noise could be coming from an exhaust heat shield or other component. When the transmission is shifted into drive, the engine (which is mounted on rubber mounts) shifts position in one direction; when put into reverse, it shifts position in the opposite direction. When in reverse, the change in engine position may be enough to allow the exhaust pipe that is bolted to the engine to shift position enough to contact some other component under the vehicle, which will rpoduce a rattling noise in reverse only. Have a friend sit in the car and put it into reverse while you lie on the ground and watch underneath the car to se if you can determine the exact location the noise is originating from; chances are you will find a netal heat shield that has rusted through and is no longer fastened to the floor properly, or some other loose component.
(2) The noise may be originating inside the transmission itself. Front wheel drive transmissions have a long chain that can contact the inside of the transmission case if it is stretched or there is other internal mechanical wear. While your friend is holding the vehicle in reverse, use a mechanic's stethoscope (about $15 at parts stores) or a long thin screwdriver held to your ear to listen to the transmission. If the noise is originating inside the transmission itself, it will likely need to be disassembled to repair the problem.
I hope this is helpful.
Kindly rate the answer
Kevin

Posted on Jul 03, 2009

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Hi,

This is a common issue and there might be million of reasons and to be frank you would agree. Let me point out some main things to be taken into consideration :-

i think the noise you are hearing is either the waterpump, tensioner pulley,or idler pulley, do you see any coolant on the ground under front of car? that would be an indication water pump is bad and needs replaced, the pulleys are part of the belt routing system, one is spring loaded and the other is bolted fast. the belt is called serpenteen, its one continues belt that runs off the crank pulley to alt. water pump, power steering pump and the 2 pulleys i talked about. Now the 2 pulleys have bearings in them my guess is one or both are bad and need replaced. I have heard that this is a common thing to go bad on jeeps. Now the jerking problem that could be as simple as a fuel filter when was the last time it was change? if its been a while change it you might be surprised. If it still jerks after filter chg. might be time for a fuel pressure test.

Also, could be the a/c compressor. The compressor went up on my jeep and it made horrible sounds. Hold a kindlin stick or large screwdriver to the compressor with engine running and put your ear to the other end. You will be able to tell if this is the problem. Don't get to close to the belt.

Last but not least, I think a hydraulic lifter has become blocked or just collapsed. The engine doesn't miss in the way it would if the valve stem was broken , or the lifter rod was bent or jumped out of the rocket socket. So I am hazarding an educated guess to a hydraulic lifter. Sounds just like my old Mustang did, when the oilway to the tappet became blocked, and the pushrod actually wore away the dome and the recess in the tappet. I guess the clearance isn't too big to cause the tappet and the lifter to lose contact completely, meaning the valve is actually opening when it should, but just not as much as it should. This engine actually resembles the 4 litre 6 cylinder in my 96 Cherokee,but I am not sure if it is identical.

Hope i helped you.

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Thanks for using "Fixya".

Posted on Jul 02, 2009

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Hi sir,
it is a fuel pump problem i think something is get mixed with fuel and so it is making sound,,ur vehicle need a service,,,,
there is no other problem..
thank u,,,/if u think my my solution will work,,please rate it

Posted on Jul 02, 2009

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