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Unread 09-17-2008, 07:16 PM   #1
severrin
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Timing chain jump/distributor needs to be replaced maybe?

I'll try to provide as much information as I can.

I have a 98 Laredo 4.0 2wd, has just over 141,000 miles on it.

For the last few days (about two but not exactly sure) the engine would take longer than usual to turn over, but ran completely normal. Last night I was driving and it started acting weird when I'd come to a stop it would be slightly jerky when coming to a stop. I had to run to the store when I noticed this, when leaving the store I cranked the jeep up and it sounded like it was puffing air and the engine idle got very sporadic, it got so bad that I had to keep my foot on the gas pedal to keep the jeep cranked.

Finally had to drive it very slowly home about 20mph the whole way, was only maybe 3 miles from home. when I got home the first thing I did was check the fuel rail pressure valve, some air spurted out then fuel flowed evenly I was thinking maybe my filter was bad. Then I check the plug wires and distributor cleaned them, there was some rust powder on the #4 plug wire. After checking and cleaning the button I cranked it back up it still was running sporadic and sounding like it was missing/puffing air. when I hit the gas it would run fine but still had the puffing sound and when i took my hand off the gas it would die.

My plugs are black from carbon i cleaned them and it get a little better then a little worse. Then I thought about an old trick, I stuck a post card under the tail pipe while running and it would suck the post card to the exhaust tip.

I'm really hoping its only that i need new plugs wires and dist cap and button. But I also think that it could have jumped time, I've had actual timing chains slip before then metal does get worn and will lengthen a bit.

Has this happened to anyone before?

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Unread 09-17-2008, 09:36 PM   #2
elmer_fud
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I haven't heard of timing chains slipping on the I-6 very often. I would start with new plugs, wires, and distributor cap. I would also check your Idle Air Control Valve, since it controls the idle of the engine.
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Quote:
Originally Posted by Speedycat View Post
I am not one to be changing lanes at 70 mph on a lifted truck on 33's, but since I am in Miami, I have to be prepared for the continuous influx of new drivers whose previous ride was a bicycle with wooden wheels.
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badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, Mushroom!!! :D
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Originally Posted by ZeeJay1997 View Post
Or just tie a 12 lb fish to a one foot pipe.
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Unread 09-17-2008, 09:41 PM   #3
severrin
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ok dumb question. where would that be?
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Unread 09-17-2008, 09:44 PM   #4
elmer_fud
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Originally Posted by severrin View Post
ok dumb question. where would that be?
It is in the throttle body next to the butterfly valves. I think there is a writeup in the FAQ
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Quote:
Originally Posted by Speedycat View Post
I am not one to be changing lanes at 70 mph on a lifted truck on 33's, but since I am in Miami, I have to be prepared for the continuous influx of new drivers whose previous ride was a bicycle with wooden wheels.
Quote:
Originally Posted by FPKites View Post
badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, Mushroom!!! :D
Quote:
Originally Posted by ZeeJay1997 View Post
Or just tie a 12 lb fish to a one foot pipe.
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Unread 09-17-2008, 10:16 PM   #5
severrin
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ok I'll definitely do that. I plan on getting new plugs, wires, cap, button, coil, and timing chain just in case.

If it continues to do this what should I consider for my next course of action?
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Unread 09-17-2008, 10:45 PM   #6
SJZ
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Quote:
Originally Posted by severrin View Post
ok I'll definitely do that. I plan on getting new plugs, wires, cap, button, coil, and timing chain just in case.

If it continues to do this what should I consider for my next course of action?
Have you tried using a scanner (the key on/off... diagnostics won't work on the '98).
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Unread 09-18-2008, 07:50 PM   #7
severrin
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Nope, I have no access to a scanner, and Can't afford to waste money on having a mechanic tell me my jeeps broken. I need the plugs and wires anyways, and symptoms sound the same as what a few other people have experienced so I'm gonna try that first.
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Unread 09-19-2008, 05:30 PM   #8
severrin
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Got new spark plugs didn't fix the problem, broke down and bought a scanner. turns out the honey combs in my cat are busted and causing the back pressure and the sucking. so now I gotta take the cat off and beat it out.
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Unread 09-19-2008, 07:19 PM   #9
elmer_fud
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Originally Posted by severrin View Post
Got new spark plugs didn't fix the problem, broke down and bought a scanner. turns out the honey combs in my cat are busted and causing the back pressure and the sucking. so now I gotta take the cat off and beat it out.
If you pull the old one off, you can sell it for most of the cost of the new one due to the valuable metals in it. It is also illegal not to have a working cat.
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95 ZJ, 5.2 V8,160,000 miles
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Quote:
Originally Posted by Speedycat View Post
I am not one to be changing lanes at 70 mph on a lifted truck on 33's, but since I am in Miami, I have to be prepared for the continuous influx of new drivers whose previous ride was a bicycle with wooden wheels.
Quote:
Originally Posted by FPKites View Post
badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, Mushroom!!! :D
Quote:
Originally Posted by ZeeJay1997 View Post
Or just tie a 12 lb fish to a one foot pipe.
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Unread 09-19-2008, 08:41 PM   #10
severrin
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If you pull the old one off, you can sell it for most of the cost of the new one due to the valuable metals in it. It is also illegal not to have a working cat.
Do you mean like a core cost? or just sell it to a scrap yard?
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Unread 09-20-2008, 06:08 AM   #11
kentman
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Unread 09-20-2008, 10:58 AM   #12
Jeeples
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Originally Posted by severrin View Post
Got new spark plugs didn't fix the problem, broke down and bought a scanner. turns out the honey combs in my cat are busted and causing the back pressure and the sucking. so now I gotta take the cat off and beat it out.
As far as I know, there is no code for a bad Catalytic converter, but I do know that the rear oxygen sensor measures the efficiency of the Cat., so before you spend $80 on a cat, what trouble code did the scanner pull?

Not trying to rule out a bad Cat, especially at the 140K mile mark, but a little more diagnostic work can save you from throwing parts at a vehicle in attempt to make a repair,

Also, the card trick you are referring too generally means you have a bad exhaust valve, not a bad catalytic converter.
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Unread 09-21-2008, 01:04 PM   #13
severrin
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Funny you should mention that, my friend who's a mechanic took a look at my jeep yesterday. The first thing he noticed while looking under the hood was that my head was spotless, he said it shouldn't be THAT clean for being ten years old. Thats a machine shop clean so he thinks I've had some head work done to it. But he was unable to diagnose the problem, the jeep has not thrown any code at all. No check engine light or anything, it's just got a misfire. and when driving it tries to bog down below 2,000 rpms. I dunno what to do other than just putting it in a shop and paying out the butt to fix it.
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Unread 11-23-2010, 03:24 PM   #14
thrashin
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Quote:
Originally Posted by severrin View Post
Funny you should mention that, my friend who's a mechanic took a look at my jeep yesterday. The first thing he noticed while looking under the hood was that my head was spotless, he said it shouldn't be THAT clean for being ten years old. Thats a machine shop clean so he thinks I've had some head work done to it. But he was unable to diagnose the problem, the jeep has not thrown any code at all. No check engine light or anything, it's just got a misfire. and when driving it tries to bog down below 2,000 rpms. I dunno what to do other than just putting it in a shop and paying out the butt to fix it.
SO what did it ever turn out to be? I have a similiar problem. I am going for the crank sensor next. Last thing I havent checked due to its location on the 5.2 .
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Unread 11-23-2010, 05:51 PM   #15
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SO what did it ever turn out to be? I have a similiar problem. I am going for the crank sensor next. Last thing I havent checked due to its location on the 5.2 .
That was over two years back, he probably fixed it a long time ago.
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