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Unread 07-04-2013, 06:54 PM   #91
KnoxButler
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Ya I haven't had anything like that.

Your Diesel thing reminded me (the wooshing) when I'm driving my Jeep sometimes I notice a sucking sound from somewhere in the engine bay, I assume its coming from in the carb as I first noticed it after I rebuilt mine. It seems to happen more while accelerating I think, the noise is drowned out by other noises so I don't always hear it.
At some time I saw another thread with a post about this but I've had no luck trying to find it again. In the the post/thread someone described it really well as the noise coming from the end of a shop vac, not the noise of the electric motor just that sound of the air being pulled into the hose. I haven't payed much attention to it but I wonder if any of you have had this or heard of someone having this and could offer some advice, or tell me weather I should concern myself with it and finding the source.

PS: I don't think its a vacuum leak, I just don't think a vacuum leak could be loud enough for me to hear it over the engine, wind, etc.

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Unread 07-04-2013, 07:47 PM   #92
86cj74.2L
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If it still doesn't pass your cat could be dead.

Do you have air injection? That also aids in helping the CAT burn off the unburned fuel.
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Unread 07-04-2013, 08:04 PM   #93
KnoxButler
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Brand new cat (cheapo Autozone one) not air injected, if that means that the cat has a hose that goes to it to help it burn hotter.

Any ideas on the sucking noise?
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Unread 07-04-2013, 08:04 PM   #94
KnoxButler
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Keep those suggestions coming on the emissions ill run through ideas on anything to help me pass.
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Unread 07-04-2013, 08:08 PM   #95
86cj74.2L
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Someone correct me if I'm wrong but even without the stepper BBD should he have a air pump and such?
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Unread 07-04-2013, 08:46 PM   #96
KnoxButler
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Its possible, Where would the piping from the cat connect too?
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Unread 07-04-2013, 08:53 PM   #97
LumpyGrits
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Not sure about non BBD and a'pump.
LG
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Unread 07-04-2013, 09:45 PM   #98
86cj74.2L
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Quote:
Originally Posted by KnoxButler
Its possible, Where would the piping from the cat connect too?
It would be a belt driven pump going to a hole in the exhaust manifold or down pipe.
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Unread 07-04-2013, 10:27 PM   #99
KnoxButler
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Ya there is an air pump and it appears like its pumping air into the exhaust manifold.

Iv got a new development. I took the Jeep out for one last test drive before I put it up for the night, when I got back and everything was nice and hot I let it sit in my car port while I listened for anything out of the ordinary. I noticed some "puffing" coming from the exhaust, its wasn't backfiring, and there wasn't any smoke or noticeable fumes coming out of the exhaust.

Any ideas what might be causing this? Could switching to ported vacuum possibly help?
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Unread 07-04-2013, 11:21 PM   #100
KnoxButler
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Happy 4th!
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Unread 07-05-2013, 09:00 AM   #101
KnoxButler
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Hey guys I took out the timing light again to check the timing with VA plugged. Spot on still, I then reconnected the VA and the timing was higher but as i increased the rpm the timing kept getting higher, my understanding was that it was supposed to drop? Am i wrong and that is what its supposed to do?
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Unread 07-05-2013, 09:08 AM   #102
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Quote:
Originally Posted by KnoxButler
Hey guys I took out the timing light again to check the timing with VA plugged. Spot on still, I then reconnected the VA and the timing was higher but as i increased the rpm the timing kept getting higher, my understanding was that it was supposed to drop? Am i wrong and that is what its supposed to do?
Timing increases with engine rpm.
You only need to set it at idle like you have, then ignore it.

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Unread 07-05-2013, 09:12 AM   #103
KnoxButler
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Ok cool thank you Four! Anyone know about the puffing I mentioned earlier?
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Unread 07-05-2013, 09:28 AM   #104
Jon In Tucson
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Quote:
Originally Posted by KnoxButler View Post
Ok cool thank you Four! Anyone know about the puffing I mentioned earlier?
Knox,
Probably a little engine wear. Valves not completely opening or closing during the compression or exhaust cycle. You can still pass emissions. God bless.
Jon In Tucson
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Unread 07-05-2013, 09:33 AM   #105
KnoxButler
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Alright Ill give it a try and report back, thanks Jon!
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carter carb , cj7 , egr , emissions , vacuum

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