Bought a Grand Cherokee with problems - JeepForum.com
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post #1 of 40 Old 08-12-2020, 03:54 PM Thread Starter
RoyceGetit
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Bought a Grand Cherokee with problems

What’s up guys. So I just picked up a 1999 Grand Cherokee Laredo 4x4 4.7 V8. The seller got rid of it bc it doesn’t run. It starts but the idle is off and it seems the engine is misfiring. There’s also a huge oil leak! I managed to figure out that the leak is coming from the left side valve cover gasket. It’s squirting out like crazy. I’m kind of relieved tho bc a valve cover gasket doesn’t seem to hard to fix. I’m wondering if.. bc the leak is so big.. the engine doesn’t have enough compression causing the rough idle and I’m hoping the gasket fix will also resolve the engine problem. Anyways I’m about to pick up a gasket today and watch a lot of videos on how to get this job done. Does anyone recommend a certain brand I should get? Any tips before I get started? Thanks guys

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post #2 of 40 Old 08-12-2020, 04:21 PM
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Scan for codes?



Gasket kit: Fel-Pro VS50521R
Left side is easy, right side is hard. Read all about it: https://www.jeepforum.com/forum/f310...l#post39911385
Tip: do the easy side first. Tip: a tiny squirt of WD40 in just the right spot can help remove old, stubborn fuel injector clips but they will probably break anyway. Tip: If I had to do the right side again (I already did, lol), I would remove the coolant reservoir, disconnect the wiring harness at the firewall, and remove the bolts holding the PCM mounting plate to the fender/firewall ... these steps provide better access to the valve cover.


I doubt changing the gaskets will solve your idling problem, but squirting oil is bad. Codes should shed some light on what is going on. WAGs would include cam and/or crank position sensors, spark plugs, ignition coils, fuel pump ... scanning for codes would help narrow this down. Sounds like PO was not much on maintenance, I expect you will need to wrench on a great many things in the future.


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ok mostly just repairs, but we are closing in on a lift
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post #3 of 40 Old 08-12-2020, 04:34 PM Thread Starter
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Originally Posted by GmanWJ View Post
Scan for codes?



Gasket kit: Fel-Pro VS50521R
Left side is easy, right side is hard. Read all about it: https://www.jeepforum.com/forum/f310/...l#post39911385
Tip: do the easy side first. Tip: a tiny squirt of WD40 in just the right spot can help remove old, stubborn fuel injector clips but they will probably break anyway. Tip: If I had to do the right side again (I already did, lol), I would remove the coolant reservoir, disconnect the wiring harness at the firewall, and remove the bolts holding the PCM mounting plate to the fender/firewall ... these steps provide better access to the valve cover.


I doubt changing the gaskets will solve your idling problem, but squirting oil is bad. Codes should shed some light on what is going on. WAGs would include cam and/or crank position sensors, spark plugs, ignition coils, fuel pump ... scanning for codes would help narrow this down. Sounds like PO was not much on maintenance, I expect you will need to wrench on a great many things in the future.
Thanks for a lot of information and tips! I will get the fel pro and some wd40 today.
So the weird thing is. There are no codes? The glovebox has a receipt from a month ago saying it had a P0340 camshaft sensor and p1391 loss of CMP. Another receipt shows that only the p0340 sensor was replaced. Not sure if this info has any value lol.
So I guess my plan for now is to fix the valve cover gasket first and then go from there.
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post #4 of 40 Old 08-12-2020, 04:36 PM Thread Starter
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Another thing.. what do you use to clean the left over gasket on the block?
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post #5 of 40 Old 08-12-2020, 06:21 PM
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Could be the wrong sensors. These like MOPAR sensors only, especially for the CPS. Also, look at the TPS and make sure the throttle body is squeaky clean.
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post #6 of 40 Old 08-12-2020, 07:10 PM Thread Starter
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Could be the wrong sensors. These like MOPAR sensors only, especially for the CPS. Also, look at the TPS and make sure the throttle body is squeaky clean.
Maybe they put in the wrong one? Ok I’ll check the sensor and the tps right after the valve cover gasket. Thanks for the help I appreciate it
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post #7 of 40 Old 08-13-2020, 09:28 AM
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Originally Posted by RoyceGetit View Post
Another thing.. what do you use to clean the left over gasket on the block?
Welcome to JF from north GA! You can use a fancy gasket scraper, but I generally use a plastic putty knife. Just be careful not to gouge or damage the surface. I clean the surface really good with a shop towel with a shot of brake clean/etc.

I'm not sure about the 4.7, but the 4.0's are particular about sensors. I would recommend using Mopar only for those.

Good luck. I almost spit out my coffee this morning when I read your title. ALL of our WJ's have problems. It's a matter of do we know it or not

2004 WJ-4.0 I6-42RE-278K-2.5" BB-265/65/17 Toyo Open Country 2 AT-Quadratec Hardrock Wheels
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post #8 of 40 Old 08-13-2020, 05:10 PM
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BUT those with no problems don't come on a forum to say that.
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post #9 of 40 Old 08-13-2020, 06:09 PM
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could also leak from the cylinder head access plug, it sits behind the power steering pump and can leak very badly.
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post #10 of 40 Old 08-13-2020, 08:57 PM Thread Starter
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Originally Posted by RoyceGetit View Post
Another thing.. what do you use to clean the left over gasket on the block?
Welcome to JF from north GA! You can use a fancy gasket scraper, but I generally use a plastic putty knife. Just be careful not to gouge or damage the surface. I clean the surface really good with a shop towel with a shot of brake clean/etc.

I'm not sure about the 4.7, but the 4.0's are particular about sensors. I would recommend using Mopar only for those.

Good luck. I almost spit out my coffee this morning when I read your title. ALL of our WJ's have problems. It's a matter of do we know it or not <img src="https://www.jeepforum.com/ubb/cheers2.gif" border="0" alt="" title="Cheers" class="inlineimg" />
Thanks! This is my first Jeep and I’m excited to get it running.
I appreciate the advice on how to clean the block. Will definitely do it that way.
What’s funny to me is, My previous project was a Suzuki sidekick and I wanted something bigger for the fam and more power. I picked up this v8 thinking this is all the power I need and now that it’s time to work on it I’m like... wooooah there’s A LOT more things on this engine! &#x1f629;&#x1f602;.

I’ve finished disconnecting all the wires to the coil packs and fuel injectors. I’m just trying to figure out how in the world I’m goin to reach the last bolts by the firewall. We’ll see how it goes lol
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post #11 of 40 Old 08-13-2020, 08:59 PM Thread Starter
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So I’m guessing this Jeep doesn’t have ac &#x1f615;
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post #12 of 40 Old 08-13-2020, 09:02 PM Thread Starter
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Originally Posted by xcaliber81 View Post
could also leak from the cylinder head access plug, it sits behind the power steering pump and can leak very badly.
I turned the car on and quickly ran to the engine to see where the leak was coming from and the oil was literally shooting from the valve cover(passenger side)!
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post #13 of 40 Old 08-13-2020, 11:35 PM
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So I’m guessing this Jeep doesn’t have ac &#x1f615;
Yikes. So those are the heater hoses. Somebody cut them off and ran a bypass. Edit: oh wait, no they just disconnected them, no cutting; you could put them back if you wanted to ... Probably has a leaky heater core that they did not want to fix.

The AC compressor is mounted on the top right of the motor. Has a pulley on the front, serpentine belt runs it. I cannot see it in your pics but that does not mean it isn't there.


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ok mostly just repairs, but we are closing in on a lift
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post #14 of 40 Old 08-13-2020, 11:37 PM
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With the right combination of extensions and swivel joints, you can do it.


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ok mostly just repairs, but we are closing in on a lift
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post #15 of 40 Old 08-14-2020, 01:32 AM Thread Starter
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Quote:
Originally Posted by RoyceGetit View Post
So I’m guessing this Jeep doesn’t have ac &#x1f615;
Yikes. So those are the heater hoses. Somebody cut them off and ran a bypass. Edit: oh wait, no they just disconnected them, no cutting; you could put them back if you wanted to ... Probably has a leaky heater core that they did not want to fix.

The AC compressor is mounted on the top right of the motor. Has a pulley on the front, serpentine belt runs it. I cannot see it in your pics but that does not mean it isn't there.
Oh so those are heater hoses? Ok I just exposed how little I know about engines lol. So maybe there’s hope I do have ac. It’s hot here in Hawaii man I need ac. I could go without the heater tho.

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With the right combination of extensions and swivel joints, you can do it.
So I ended up getting the 2 bolts closest to the firewall off. Having the heater hoses disconnected made it easier to get to. I couldn’t reach the bolts with the studs on um with a regular socket tho. Went to my local O’Reilly’s for a deep socket and they had none! Unbelievable. I’ll try Napa’s tomorrow and hopefully finish the job. Thanks for the encouragement! &#x1f919;
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