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Old 12-17-2007, 05:36 PM   #1
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Weird hesitation- engine stutter/cutting out

I have a '97 Sahara 4.0L with a 120k.

It's started to do cut out here and there just for a split second. It seems to happen most often when the engine is under a pretty good load, like accelerating up hill on the freeway. I can't make it happen whenever I want but it's definitely happening more often. It feels like the fuel or air supply is being interrupted or something but the 'check engine' light hasn't come on at all.

I was thinking it might be the catalytic converter is shot and all plugged up. Anybody out there with similar mileage had experience with this? Any ideas?

Thanks

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Old 12-17-2007, 07:11 PM   #2
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Quote:
Originally Posted by rtiburon View Post
I have a '97 Sahara 4.0L with a 120k.

It's started to do cut out here and there just for a split second. It seems to happen most often when the engine is under a pretty good load, like accelerating up hill on the freeway. I can't make it happen whenever I want but it's definitely happening more often. It feels like the fuel or air supply is being interrupted or something but the 'check engine' light hasn't come on at all.

I was thinking it might be the catalytic converter is shot and all plugged up. Anybody out there with similar mileage had experience with this? Any ideas?

Thanks
A plugged cat would not be an intermittent problem. Intermittent problems are usually something electrical. I had a 89yj with the same problem you describe. Ended up being a bad coil. When was the last time it had a tune up? New plugs, wires, cap and rotor. Thats what I would start with

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Old 12-17-2007, 07:21 PM   #3
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Thanks. Is testing the coil pretty easy? My last tune up (cap, rotor, plugs, etc) was at about 90k. I've also been reading on some other sites that the TPS sensor can be bad or the connection just dirty and cause the same bucking/surging problems.
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Old 12-17-2007, 10:08 PM   #4
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Originally Posted by rtiburon View Post
Thanks. Is testing the coil pretty easy? My last tune up (cap, rotor, plugs, etc) was at about 90k. I've also been reading on some other sites that the TPS sensor can be bad or the connection just dirty and cause the same bucking/surging problems.
I had to have the dealer do the diagnostics to find out the coil was bad, so I really don't know how to test it, sorry. I have heard the same about the TPS, worth a look. I have also had a bad spark plug cause a bucking problem two times. First time was in my wifes old Ford Escort, second time was in a Ford Ranger. Same thing both times, electrode on the plug was completely melted away. Same brand of plug both times (Autolite) Needless to say I have never used that brand of plug since. Mechanic friend of mine said it happens often enough that they call those plugs "Auto-lite, but they don't"
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“He who knows not and knows not that he knows not, he is a fool, shun him.
He who knows not and knows he knows not, he is simple, teach him.
He who knows and knows not he knows, he is asleep, wake him.
But he who knows, and knows he knows, he is wise, follow him.”


89 yj 4 banger 5sp. 2" BL 31x10.50 fixed up and sold
97 tj 4.0 Auto 4"RC lift 33x12.50 mud rovers on outlaw IIs . Smitty bumpers
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Old 12-17-2007, 10:09 PM   #5
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One more thought, bad gas? Try some dry gas or change filling stations
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He who knows not and knows he knows not, he is simple, teach him.
He who knows and knows not he knows, he is asleep, wake him.
But he who knows, and knows he knows, he is wise, follow him.”


89 yj 4 banger 5sp. 2" BL 31x10.50 fixed up and sold
97 tj 4.0 Auto 4"RC lift 33x12.50 mud rovers on outlaw IIs . Smitty bumpers
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