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post #1 of 9 Old 02-20-2020, 11:28 AM Thread Starter
Nof-z
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clicking sound

Hello!

My jeeps 4.0 engine is making a clicking noise, as you can here in the video. A few facts: 4.0 engine, the sounds diminishes but does not go away entirely when the engine is warm (the video is a cold start on a very cold day), the sounds all but goes away between 1k-3k rpm when driving, and there is no decrease in engine performance. it seems a little too loud for a exhaust leak, could it be the lifters? please help, I need to order a new part soon!


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post #2 of 9 Old 02-20-2020, 02:12 PM
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Try to determine where the noise is coming from on the engine. A mechanic's stethoscope or a length of heater hose/long dowel/screwdriver held to your ear and the other end at suspect areas helps to pinpoint sources of noises.

It may or may not be an exhaust leak, but it couldn't hurt to check for loose fasteners where the exhaust manifold bolts to the cylinder head and at the mini cats and downpipe.

Is you oil pressure normally a little over 40psi at cold idle? What is your oil pressure at idle immediately after a sustained fifteen minute highway drive?

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post #3 of 9 Old 02-20-2020, 08:04 PM
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one of my catalyst elements is rattling ; but only at slow engine speeds

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post #4 of 9 Old 02-21-2020, 01:24 PM Thread Starter
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It looks like the sound is coming from something on the drivers side, underneath where the intake manifold is. When it is cold, the pressure is about 45-50 psi, then once it has warmed up, it goes to 35-40, and stays there unless I am doing some high rpm driving. There also appears to be a small oil leak on the passenger side somewhere, but that probably is not related.

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post #5 of 9 Old 02-21-2020, 01:59 PM
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Quote:
the sound is coming from something on the drivers side, underneath where the intake manifold is
Exhaust leak is the most likely culprit here.

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post #6 of 9 Old 02-22-2020, 12:36 PM Thread Starter
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That's what I am thinking. Does anyone have any recommendations for what brand of part I should get?

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post #7 of 9 Old 02-22-2020, 03:56 PM
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Brand of what part? If you have an exhaust leak, it's most likely due to loose fasteners.

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post #8 of 9 Old 02-23-2020, 11:28 AM Thread Starter
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exhaust manifold/headers. I am going to try to tighten everything in that system today or tomorrow, But just in case It turned out to be a hole somewhere, I might need to buy some new parts (A win for me)

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post #9 of 9 Old 02-23-2020, 02:27 PM Thread Starter
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UPDATE: I checked and tightened all the exhaust bolts, as well as the valve cover, which was a little loose. That still did not pinpoint the Problem. I checked the oil, and I needed to add 1.5 qts to get it up to safe level. Finally, the sound seems to be coming from the area of what I believe are the "mini cats" just upstream of the actual cat. I dont have a good method of checking, however, the sound is the loudest there, either in the oil pan, or those. there are no visible holes, however the oil pan is quite wet with oil, but only on the bottom, and the drivers side.

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