Last post on Oct 28, 2013 at 4:35 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee
What is this discussion about?
Jeep Grand Cherokee, Jeep Grand Cherokee SRT-8, Jeep Cherokee, Engine, SUV
#46 of 731 Re: p cherokee engine ???? [lunghd]
Feb 07, 2007 (3:18 pm)
ok yeah you have read what all that i have put
It stays the same with higher reves but they are more constant with the motor , But i just started it today and it wasn't as loud of a tap now it is more like a combination wrench is being hit on the inside not a hammer
And it starts go away at about 1 and 3/4 rpm but by 2 it is gone and when it hits three it starts to have this kind of whining sound and i haven't gone above that
and the pressure gauge is at about 60
#47 of 731 Lundell
Feb 07, 2007 (4:29 pm)
Sounds like a combination wrench? ( A ratchet??? ) I think I get ya. If I'm not understanding - please correct me!
" SOUNDS LIKE " a sticky lifter but get a second opinion from an old neighborhood wrench you may know just to be sure.
Assuming it's a sticky lifter: IE, if it's NOT a hammering/knocking sound that has a deeper sound... but is more like a ticking / tapping then try the Marvel Mystery Oil per directions on the bottle.
SO LONG AS THE ENGINE ISN'T ACTUALLY KNOCKING... run it a few weeks, change the oil & filter & do the Marvel Mystery Oil thing again. You may have to repeat this again but it usually clears it up in a few weeks of running the motor.
I did this a few times & it cleared up my sticky lifter. MMO is great stuff - glorified tranny fluid but does the trick!
If your oil has been neglected in prior years the MMO will cause the oil to get dirty faster as it loosens up the varnish build up so be prepared to change the oil a few times in the next few months depending on your miles driven.
AGAIN - if you have a knocking rod... this is NOT the way to fix it! Get that second opinion from a friend or neighborhood wrench...
Link to my site:
Another Freakin' Jeep Cherokee Website
#48 of 731 Getting some where
Feb 07, 2007 (7:25 pm)
when i said combination wrench i mean the wrenches that have a box on one side and then an open end on the other
And for this MMO i have to drain the oil in it now put that in and then just run that and you think that it will stop and if it doesn't just change the filter and do it again
But i will still go ask someone that knows what they are talking about also and if he thinks it is a sticky lifter i will try it
but i will get back to you and tell you what he says and the prob might get figured out
thanks a bunch for given some knowledge this way most people would just say what ever
#49 of 731 Re: Getting some where [lundell]
Feb 08, 2007 (6:16 am)
Glad to help if I can! Just hope I can save you some $ with a cheap fix instead of having to open the motor up.
Yes, definitely get that second opinion on the sound just to be sure. The sound you're describing sounds more of a metalic 'tank' sound, like a wrench striking the block than the 'tick-tick'tick' a lifter makes. Lifters can be pretty noisy - pushrod can be flopping around a bit if it's fully collapsed (which MMO will not fix...).
No, you don't have to drain the oil now unless it's already past time to change it.
Get that second opinion on the sound first... but if it's a lifter you just add the MMO to your oil now & run it until your oil change is due... THEN change it. It's all on the bottle.
If you still have a sticky lifter, add it again. In my case it only took a couple of times adding it and no problem since.
Again... have that noise confirmed as a bad lifter first.
#50 of 731 MMO VS slick 50
Apr 27, 2007 (6:45 am)
I have a friend who uses MMO and he swears by it. But my father is a die hard slick 50 guy. I was wondering about which to use in an engine I am building (all brand new parts). or is the MMO stuff just for lubing up older engines?
#51 of 731 Re: MMO VS slick 50 [440jeep]
Apr 27, 2007 (3:32 pm)
be sure to brake in the new engine before mmo or slick 50 at least 1000 miles so rings seat or you will have a oil burner
#52 of 731 Erratic engine performance
Mar 05, 2007 (6:23 am)
I have a 98 Jeep Cherokee 4.0L with about 85K miles on it. After starting normally, it runs and drives normally for about a minute, then it starts to misfire and won’t handle a load for about 45 seconds. After that, it drives fine until I shut it off. The problem happens even when the engine is fully warmed up, if there is a 15 minute or so cooldown period. If I stop enroute, say for gas, no problem. When the problem is occurring, I can rev the engine OK (manual trans), but cannot load the engine until it “clears”. If I watch the RPMs when I first start the engine and just let it idle, you can see the change from about smooth 1000 RPM to an erratic 250-750 RPM, then a surge to about 1200 RPM back to a smooth 750-1000 RPMs again. Almost seems like a timer-based mixture change or failed sensor bypass. If I attempt to “drive through it” there’s often a backfire-like sound under hood. My usual trips are very short, less than a mile, 3 or 4 times a day. I’ve run some fuel injector cleaner through it and changed the coolant, replaced rotor, distributor cap and wires, but that’s about it. Although I’m not a trained mechanic, based on symptoms, I think I may have ruled out coolant temp sensor and throttle position sensor. Any ideas before I submit to the mercy of the dealer? Thanks in advance!
#54 of 731 Re: Erratic engine performance [cpb2]
Mar 14, 2007 (11:17 am)
Hi, Did you find out what the problem is? My Jeep is doing the same thing, it's also a 98. I have replaced the distributor cap, spark plugs, crank shaft position sensor, fuel injectors, fuel pump, fuel filters, fuel pressure regulator, and I cannot figure out what the problem is. It is still acting up. Please let me know if you find out. Also, my check engine light is not on and so I cannot get a diagnostic reading and the dealer says that it wouldn't be a computer problem or O2 sensor/catalytic converter issue if my check engine light isn't on. The dealer wants to charge alot to even look at it, just wanted to check and see if you could help me out or if anyone else has any suggestions. Thanks.
#55 of 731 Re: Erratic engine performance [lvgm250]
Mar 17, 2007 (7:52 pm)
not fixed yet, but I have not invested any time or money yet; hoping for forum help, too. Like yours, no check engine light or diagnostic codes are set on mine. I don't see the cam position sensor on your list. I seem to recall my problem showing up about the same time I replaced the plug wires/dist cap and rotor. That was prompted by noticing arcing from plug wires after washing engine. Problem seems to be worse in the rain. Wonder if I got something wet or damaged a weatherseal?
Mine does not die completely like the Grand Cherokee thread recommended by the host. Will keep forum posted if I succeeed.