eastonarcher1993

I hear this noise in my engine that sounds like a cylinder is rattling and clinking as if loose. I have a 4.0 inline 6. Did this happen to anyone else or does anyone know what's wrong with it. Thanks in advance.

eastonarcher1993

Anyone?

BNJeepsta

Is it an auto?

AMXJ

Could be a carbon knock but those usually go away after running the engine a while. If it's an automatic it could also be a cracked flex plate. How is the oil pressure?

BNJeepsta

^^^ That's what I'm saying. The flexplate was what was knocking in mine. But it could be low oil pressure. How's the RMS? Also do you have an Aftermarket oil pressure gauge or the stock one in the cluster? I have owned 3 xj's and they all had bad oil pressure gauges. You may also have a dead cylinder. Pull the plugs and look at them.

eastonarcher1993

Dead cylinder? And I just heard a noise today that sounds like the flywheel is hitting the engine but it's not?

eastonarcher1993

It is an auto

JeepinXJ01

Double check your oil pressure and keep an eye on your temp and coolant level. Mine made that noise then a few days later I was adding a jug of coolant. Then it led to a jug a week. Realized I cracked the head. It was really common in 2000-2001 I6s.

eastonarcher1993

Still making this sound but it stops when I hit 45 mph?

cruiser54

Check to see that your flexplate to torque converter bolts are not loose.

BNJeepsta

If it stops when you hit 45 or so then its probably the flex plate.

cruiser54

Until the inspection cover comes off and a 15mm wrench is put on the bolts and/or a flashlight is shined up in there, we'll never know.

Studies have shown that more Jeeps get fixed with flashlights and tools than keyboards and monitors.

BNJeepsta

So I'm a little confused. Were you trying to be funny or were you being ignorant and implying that I only know how to operate a keyboard? Either way I agree that the bolts should be checked and that the flexplate should be inspected for cracks. And if you were just being ignorant then plz knock it off. I'm only trying to help as so many on here have done for me.

cruiser54

You are offering excellent advice and I agree with you 100%. Until the OP heeds some of this advice and he or a shop/friend inspects his vehicle it's never gonna be solved.

My point is, he should check the bolts and flexplate. If that's not it, let's go on to something else. Many times in the diagnosis and repair of vehicles, as I'm sure you know, it's a process of elimination. You have to eliminate some possibilities.

BNJeepsta

Oh okay lol just wasn't sure what you were trying to imply. I heard that a loose bolt in the starter can cause a knocking sound as well? Have you hear of this?