The return of the hiss - Page 2 - JeepForum.com

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post #16 of 88 Old 03-28-2014, 03:02 PM Thread Starter
jbsj33p
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Has anyone heard of a distributor going bad and making weird noises? I think mine might be on the way out.. I get a squeak on cold start and a dry bearing noise while running WITHOUT the belt on. I didn't rev it up with the belt off so I will take it off again to see if that's my hiss too.


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post #17 of 88 Old 03-28-2014, 03:36 PM
zjosh93
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That's exactly what mine did in 2008. Loud squeaking that came and went. I could feel the vibration in the cap. Took it out and could barely turn the shaft by hand. Considered taking it apart to clean the nasty varnish out of the bearings but just threw a reman at it instead. Been fine since.
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post #18 of 88 Old 03-28-2014, 08:32 PM
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Interesting. I have some bearing no is I can't seam to pin down. I'll check mine


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post #19 of 88 Old 03-29-2014, 09:50 PM Thread Starter
jbsj33p
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Checked the distributor today and it looks fine, no play in the shaft and it turns smoothly. Next I will try running it without the belt again but if that's not it the only other thing it could be is my cheap eBay exhaust manifold having some sort of defect.

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post #20 of 88 Old 03-29-2014, 10:54 PM
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I saw where Highlonesome mentioned checking the vacuum hose attached under your battery tray but he said that might not be your noise. You might want to check your vacuum reservoir under the tray to make sure the plastic isn't cracked and check the hose at the same time. Maybe a small crack in the plastic reservoir would be just enough to make it hiss as air is being pulled into the reservoir rather than vacuum being built up/stored. Just a thought...

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post #21 of 88 Old 03-29-2014, 11:11 PM Thread Starter
jbsj33p
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Oops sorry forgot to mention I check that yesterday, its been a long day haha. I disconnected the vacuum fitting that goes to the manifold from the reservoir and plugged it, no change in noise. Unless there's more than one hose that goes to the reservoir I could only find that one.

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post #22 of 88 Old 03-29-2014, 11:32 PM
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Nope, just one hose, good luck hunting for the noise. What manifold/header did you buy off of ebay?

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post #23 of 88 Old 03-30-2014, 11:37 AM Thread Starter
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Just search eBay for jeep 4.0 exhaust manifold and find the cheapest one, that's what I got. These were back in my younger days when I hadn't figured out you get what you pay for. I think that's it what is doing it but with a new good manifold being around $200 that's not a part I want to just throw at it.

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post #24 of 88 Old 03-30-2014, 09:23 PM
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I can't believe you bought one of these!

, sorry couldn't resist! Maybe get a stethoscope and see if you can pinpoint if the noise is coming from the manifold or somewhere else.
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post #25 of 88 Old 03-31-2014, 08:46 AM Thread Starter
jbsj33p
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How'd you get a picture of the manifold I have? looks like my welding though... I'll try and hunt for a leak but its difficult to find one that only appears when the engine is loaded up to 2,000 rpm

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post #26 of 88 Old 03-31-2014, 09:02 AM
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Is it the intake sucking air?
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post #27 of 88 Old 03-31-2014, 09:07 AM Thread Starter
jbsj33p
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I will look for that too, its a nice day why not. Spray some water around the manifold where it joins to the head.

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post #28 of 88 Old 03-31-2014, 09:13 AM Thread Starter
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I wonder if since it only does it under load there would be a way to put a vacuum on the manifold while its not running or use a pressurized smoke machine to make hunting it down easier. I know some shops can do stuff like that but I don't have any cool tools like that, does anyone have a diy way to do it?

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post #29 of 88 Old 03-31-2014, 01:05 PM Thread Starter
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I think I have confirmed it is an exhaust leak, I had a helper hold a rag over the exhaust while i reved the engine and listened. At first I didn't hear anything but I held it at 2,000 for about 10 seconds then sure enough it started hissing at me. Now I just need to pinpoint it.

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post #30 of 88 Old 03-31-2014, 09:28 PM
Brendan4862
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I hate it when there's an exhaust leak caused by flexing (under load)

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