99' 4.0 Dieseling sounds at warm up.

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08-29-2013 | 05:13 PM

#16

sthon

CF Veteran

Joined: Mar 2011

Posts: 2,570

Likes: 4

From: California

Year: 1992

Model: Cherokee

Engine: 4.0 HO

Quote:

Originally Posted by Vincenza V

Sorry for the late response. I just started college.... Mindf*cked.....

I guess I can change the filter in the next weekend or two. It is a year old because the oil looks pretty darn good still. I don't buy that 3K miles bs. Secondly, my wife's Ford Ranger (96'-engine by Mazda mind you) has 300K miles on it, It has had maybe TWO oil changes in the 9 years we've been married. She just never did um (chick thing I guess). That truck is a vampire and runs AMAZING! It is crazy really. An abnormality really-but it thinks it's a Mazda.

I'd never do that to the XJ, but I moved states and started school in these past few months so it really hasn't been a priority right now. If the oil looked dark, I would feel completely different. I do plan on doing the O/C within two weeks. I'll let you know if it went away if you are still following this.

Sell your vehicles and buy bicycles.

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08-29-2013 | 05:37 PM

#17

Radi

CF Veteran

Joined: Apr 2012

Posts: 5,302

Likes: 21

From: Wisconsin

Model: Cherokee

There is no Mazda motor in your 96 Ranger.

There was a choice of three in 1996:
4.0 V6, the "cologne" V6 from Ford of Germany,
3.0, the Ford "Vulcan" V6, produced in Lima OH, or
2.3, OHC 4, also produced by Ford in Lima. The old Pinto motor, lol

The '96 Mazda version of this truck used the Ford engines, not vice-versa.

If you are only going to change oil every 4.5 years, please do not buy an XJ. There are a dwindling number of them left and ruining one on purpose isn't funny.

Last edited by Radi; 08-30-2013 at 03:42 AM.

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08-29-2013 | 09:34 PM

#18

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 13

From: Parham, ON

Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

The 4.0L is not a tight clean engine you want to run extended OCIs in. It's a tractor from the 60s. 5k miles is fine if your rings don't let too much gas through but nothing longer unless you have a lab test your oil to prove it.

Also your wife might want to seriously start saving for a new engine.

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08-29-2013 | 11:27 PM

#19

pickles

Senior Member

Joined: Jun 2010

Posts: 703

Likes: 4

Year: 1993

Model: Cherokee

Engine: 4.0

My 99' has piston slap.. sounds pretty bad. 173,000 miles on it though

But it completely dissapears once the engine reaches operating temp

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08-29-2013 | 11:29 PM

#20

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,565

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by pickles

My 99' has piston slap.. sounds pretty bad. 173,000 miles on it though

But it completely dissapears once the engine reaches operating temp

Oil filter you're using?

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08-30-2013 | 09:39 AM

#21

Vincenza V

Thread Starter

Senior Member

Joined: Jun 2011

Posts: 759

Likes: 2

From: Florida

Year: 1999

Model: Cherokee

Engine: 4.0

Radi-thanks for the input. I thought it went both ways. Good research info. I did get a good laugh from the bicycle comment.

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08-30-2013 | 09:43 AM

#22

Vincenza V

Thread Starter

Senior Member

Joined: Jun 2011

Posts: 759

Likes: 2

From: Florida

Year: 1999

Model: Cherokee

Engine: 4.0

Salad, good perspective! Yeah, she has had this thing for a while and wouldn't weep one bit when it dies (the Ranger). It just runs so freaking well and gets amazing gas mileage. We can't get rid of it until it breaks. My buddy has a similar year Ranger and has nothing but good stuff to say about his too

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08-31-2013 | 03:23 AM

#23

Radi

CF Veteran

Joined: Apr 2012

Posts: 5,302

Likes: 21

From: Wisconsin

Model: Cherokee

Quote:

Originally Posted by Vincenza V

We can't get rid of it until it breaks. My buddy has a similar year Ranger and has nothing but good stuff to say about his too

Glad to see you can take a poke in the ribs, lol. I've had very good luck with Rangers, owned 3 of them, all with 4.0 V6's. Those motors ran long past the point where the rest of the truck was too rusty to keep repairing. Wish I could say the same for the A4LD transmission. Rebuild every 75K miles.

I believe all three of my ex-rangers are still running around town all rotted out, probably well over 300K on all of them. Can't kill that motor.
Now go change your oil and filter, lol.

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08-31-2013 | 05:03 PM

#24

pickles

Senior Member

Joined: Jun 2010

Posts: 703

Likes: 4

Year: 1993

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by cruiser54

Oil filter you're using?

Oil filter has nothing to do with piston slap. The pistons were simply a bit too small in some of these motors, and they rattle around in the cylinders until the pistons get hot and expand to tighten up the clearances.

The early GM Vortec 5.3's were notorious for the same issue.

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08-31-2013 | 07:00 PM

#25

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,565

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by pickles

Cheapie oil filters can cause a rattling on start-up and is quite common. Especially with Fram, STP, and others with **** poor anti-drainback valve.

The Renix era Jeeps were not known for piston slap. That came along with the HO motor.

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08-31-2013 | 08:49 PM

#26

pickles

Senior Member

Joined: Jun 2010

Posts: 703

Likes: 4

Year: 1993

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by cruiser54

Lack of oil pressure on start up will cause "valvetrain rattle", not piston slap.

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08-31-2013 | 09:34 PM

#27

bigbadon

Senior Member

Joined: Jan 2012

Posts: 952

Likes: 3

Year: 2004

Model: Grand Cherokee

Engine: 2000 4.0

Quote:

Originally Posted by pickles

Lack of oil pressure on start up will cause "valvetrain rattle", not piston slap.

Lack of oil FLOW not pressure...valve train just needs oil delivered. There is no component that requires pressure beyond what it takes to push the oil.

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08-31-2013 | 09:57 PM

#28

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,565

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by pickles

Lack of oil pressure on start up will cause "valvetrain rattle", not piston slap.

Has it been determined the OP's problem is piston slap for sure?

Or have only you determined that from your computer monitor?

Aren't we obligated to get to the root cause of a problem before shotgunning answers? Explore a few options?

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08-31-2013 | 10:08 PM

#29

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,565

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by bigbadon

Lack of oil FLOW not pressure...valve train just needs oil delivered. There is no component that requires pressure beyond what it takes to push the oil.

Correct. And a poor quality oil filter with a crappy anti-drainback valve, on a Jeep with an upside down or sideways oil filter spells disaster.

Piston slap is present on start up and a fair while after that until the engine warms. You don't get piston slap for only a short period of time like you do valve train oil starvation.

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