2.5 97 Wrangler small backfire sputtering loss of power - JeepForum.com
 
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post #1 of 9 Old 06-10-2014, 08:06 PM Thread Starter
GuzzyWrangler
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2.5 97 Wrangler small backfire sputtering loss of power

2.5 liter 1997 Jeep Wrangler

So iv searched the web for sometime on this problem. First, it starts and idles fine every time. Engine can either be cold or hot. Happens in first gear at initial take off, or even at the point when the clutch is fully release and load is beginning to occur on the engine. Occasionally happens when shifting into second and load is beginning again. What happens is when I give it gas, easy or hard, the RPMs drop, one small pop out the exhaust (no pop in intake), and idles slightly lower than normal. I have to release the gas peddle in order for it to stop sputtering and than give the gas a tap to return to normal idle speed.

Things that have been replaced this week:
Idle air control sensor
MAP sensor
Intake Air Temperature sensor
Throttle Body Position sensor

Any Ideas?

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post #2 of 9 Old 06-10-2014, 08:33 PM
Dave02TJ
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How is the ignition side of things? Such as the cap, rotor, plugs and wires?
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post #3 of 9 Old 06-10-2014, 09:33 PM Thread Starter
GuzzyWrangler
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i was going to do an overhaul on the ignition tomorrow. Ill let you know what happens, just seeing if I'm missing something else
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post #4 of 9 Old 06-10-2014, 09:34 PM Thread Starter
GuzzyWrangler
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But as far as i know at the moment without having to go into the jeep, ignition seem good. but like i said I'm gonna do it all tomorrow anyways
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post #5 of 9 Old 06-10-2014, 10:24 PM
Dave02TJ
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Quote:
Originally Posted by GuzzyWrangler View Post
i was going to do an overhaul on the ignition tomorrow. Ill let you know what happens, just seeing if I'm missing something else
Personally I think that is a very good idea.
Whether or not it fixes your problem remains to be seen.
From your description of the problem it is a reasonable course of action to take IMO.
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post #6 of 9 Old 06-11-2014, 08:18 AM
CBTJ
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If after the ignition system is found to be in good shape, you might try unplugging the upstream o2 sensor and drive it. If that makes the problem disappear, then just change it out for a new one. It worked on mine with a very similar set of symptoms and I never had a check engine light come on indicating a problem with the sensor.......until I ran it unplugged, which will set off the light
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post #7 of 9 Old 06-11-2014, 11:30 PM Thread Starter
GuzzyWrangler
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Alright, so last night i changed plugs, wires, distributor cap, distributor rotor. problem still persisted. today i changed the fuel pump and man the fuel strainers were horrible black and brown. changed those too. As of right now, its running perfect. haven't felt a sputtering yet. Not keeping my hopes up as most of the time I'm let down. If problem comes back, i will change the upstream O2 sensor next. I hate when threads end with no solution so i will post again at the end of the day tomorrow. thanks for the advice guys
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post #8 of 9 Old 06-14-2014, 12:24 PM Thread Starter
GuzzyWrangler
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problem disappeared for awhile but came back. going to try and unplug the O2 sensor see if that does anything.
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post #9 of 9 Old 07-13-2015, 10:58 AM
Tbayfinn
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Lol another thread that ends with no solution....
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backfire , loss of power , sputtering

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