Engine sounds like a diesel

A

Alwaysdutch

NAXJA Forum User

Location

Atlanta

• May 4, 2017

• #1

Lately I noticed that when the engine is warmed up, and I sit in traffic, the engine starts to sound like an old fashion diesel. I can hear it up to about 1,300 rpm.

Any ideas on what that could be?

 

9

90xj06

NAXJA Forum User

Location

Peabody, MA

• May 4, 2017

• #2

some say piston slap. some say valve train noise. i think i red here that the lifters get stuck and stop rotating and that bringing the engine up to ~4k for a moment will free them.

 

N

nicpaige

NAXJA Forum User

Location

Ohio

• May 4, 2017

• #3

Sounds like most straight six engines.

 

I

iwannadie

NAXJA Forum User

Location

Gilbert, Az

• May 4, 2017

• #4

Exhaust leak? So many possibilities.

 

A

Alwaysdutch

NAXJA Forum User

Location

Atlanta

• May 5, 2017

• #5

Thanks for the replies. Other than the issue described on my other thread, this engine is quite, runs 18.5 mpg, and seems smooth. I put in a cheap oil so it could clean the engine by changing it again after just a few weeks, which is now.

 

V

vikingxj

NAXJA Forum User

Location

Bellingham, Washington

• May 5, 2017

• #6

Did you use the green nozzle or the black one at the gas station? :twak::laugh3:

 

A

anderld47

NAXJA Forum User

NAXJA Member

Location

California

• May 5, 2017

• #7

Another possible explanation would be a cracked spacer plate. Mine started rattling like crazy and when I pulled up to a buddy's place he ask if I had a diesel. The noise would go away under load, but return at idle. Because I'm too old to do this s**t myself anymore I had a transmission place do it. Between the body armor and having to pull the tranny it ended up costing me $800, but that did it.

 

A

alexgalexg

NAXJA Forum User

Location

Connecticut

• May 8, 2017

• #8

It could be piston slap. But honestly its likely just lifter noise. Its normal to hear a little knocking now and again when you first start these on a cold day but not once warm or while driving.

 

C

Creeper2012

NAXJA Forum User

Location

Hanover, IN

• May 8, 2017

• #9

Might check your timing? Could be pre-ignition since it happens after it warms up?

Sent from my SM-G920V using Tapatalk

 

L

LKN_xj

NAXJA Forum User

Location

Cornelius, NC

• May 8, 2017

• #10

Ours has knocked pretty darn loud since around 1995 (it's a 1991 model). After 360k miles it hasn't given up the ghost yet. Over the years i've asked folks what it is. Most common answer is lifters.