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Old 09-14-2010, 07:53 AM   #1
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please help me :-(

Still having trouble with my 97 TJ and I fear I will never get to the bottom of it...

It has a slight jerk/ miss at idle and throughout the rev range which makes it annoying to drive, when I rev the engine and then come off the throttle I hear not quite a backfire but a slapback noise from the exhaust which sounds like it isn't happy, it idles fine then stumbles momentarily, as I rev I feel the miss is still present throughout the range (if that makes sense)

I must apologize for my description I am not all that mechanically minded

So far I have changed plugs (OEM) wires, distributor cap, rotor arm, replaced the manifold & both o2 sensors, cleaned the throttle body & IAC but the problem still persists and I am running out of cash/patience with it
and I don't know where to go next....if anything its a bit worse, there is no leaking exhaust noises or signs of a vacume leak, should I continue down the sensor route? TPS? its like the timing is out but I know its not adjustable.....arghhhhhh! please help me

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Old 09-14-2010, 07:58 AM   #2
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6 or 4 cylinder?

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Old 09-14-2010, 08:01 AM   #3
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I had a 97 wrangler and your story sounds very much like what happened to mine.

During winter water separated from my fuel and got into part of the fuel injectors. When it got cold enough to freeze the water expanded and cracked the fuel injectors. Once that happened every time I gave it any throttle it sounded like you described.

You could check that.
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Old 09-14-2010, 09:05 AM   #4
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Thanks guys, Its a 6
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Old 09-14-2010, 10:04 AM   #5
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I have been reading that '97 & '98 4.0L were given a "Bad" batch of valve springs. Some people I have spoken to said that after a valve spring replacment all was OK. Might want to read up on this as it may be your problem. Are you getting a #43 code thrown ?
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Old 09-14-2010, 10:45 AM   #6
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My 98 Jeep was doing this thing I called a 'hiccough', so I feel your pain with trying to describe the symptoms! As it turns out, it was the TPS and she has been running like a top and getting some decent gas mileage to boot! Good luck-
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Old 09-14-2010, 10:58 AM   #7
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Thanks again for your responses, the only code i have had was the o2 sensor which I have now replaced

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