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anthonyms
New User
Nov 7, 2012, 12:54 PM
Post #1 of 5
(1934 views)
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Exhaust Problem???
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I have a 99 jeep wrangler with the 4.0 6cyl. yesterday I was driving it was running fine and then all of a sudden it bucked a couple of times and then ran like it was only on 2 cylinders. when I found a place to pull over I started seeing smoke coming out from underneath the car. When i looked under the muffler was cherry red erom the heat. I shut it off and sat for about a half hour and then tried to start it, it started right up and I drove it a few miles home without any problem. trying to figure out what would cause this to happen.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 7, 2012, 3:12 PM
Post #2 of 5
(1893 views)
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Re: Exhaust Problem???
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That's an engine problem, not an exhaust problem. It had to be running pretty bad before that happened.
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anthonyms
New User
Nov 7, 2012, 8:39 PM
Post #3 of 5
(1866 views)
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Re: Exhaust Problem???
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It could be, but It runs great, it's my daily driver and I keep up on the maintenance and put 100 miles a day on it. this came out of the blue.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 8, 2012, 4:12 AM
Post #4 of 5
(1844 views)
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Re: Exhaust Problem???
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As HT said it had to be running real lousy for a while but still burning fuel in exhaust = the cherry red. Wild guess but IMO worthy of ruling out some reasons why and now runs fine..........
#1 Get codes read. Yup even the so called old style real Jeep stores codes. Near has to have some info in there.
My gut says now that you said you drive that much defaults to what happens or could with this engine layout by looks still a 258 C.I.D. straight six. Nothing really wrong and were used for ages.
I'm thinking valve timing. If I hadn't witnessed a few the OE (likely) timing chain set actually can jump by surprise and by some miracle jump back to on time. Well cared for is great but they just don't last forever most lose it to a nylon cam gear. Set looks like this.....
You can't see this but can check for how much lash it has. Take off distributor cap. Note position of the rotor, leave cap off. Put a socket on crank bolt and turn both ways noting on harmonic balancer how much it can turn if you need to reference it with just a scratch on it and one on nearby mounted part. Might have timing marks or not.
If so use that. Even if it does might be hard to see them. Doing this pulls slack/lash one way then when turned the other way shows how much slack/lash is there. If no marks I'll say it shouldn't move more than perhaps 1/2" max or 5 degrees if marked.
Might not be the issue at all but at age and presumed higher miles this is a weak link that can be erratic though most just fail and become obvious.
These can take some pounding high miles with a few known weak spots that can be dealt with. I'd rule that out and if a keeper for more do that chain anytime work is needed that is near it,
T
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 8, 2012, 5:48 AM
Post #5 of 5
(1834 views)
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Re: Exhaust Problem???
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Was the check engine light on or flashing when it was running bad? If so, it would be interesting to see what code(s) were stored.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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