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engine bucks out of nowhere

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Old Nov 10, 2012 | 01:00 PM
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Default engine bucks out of nowhere

I have a 95 xj sport , sometimes while im driving or even idleing, my engine loses power almost like it isnt taking the gas for a few seconds.. Then all of the sudden, the power kicks back in and off i go, any ideas?
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Old Nov 10, 2012 | 01:05 PM
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That could have a number of causes. have you checked it for codes? tps? oxygen sensors?
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Old Nov 10, 2012 | 01:08 PM
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Well, i just cleaned my relay box with some electrical cleaner, seems like it did the trick.
Thanks though!
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Old Nov 10, 2012 | 06:36 PM
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Originally Posted by 97xjCrow
Well, i just cleaned my relay box with some electrical cleaner, seems like it did the trick.
Thanks though!
Yes, could be a lot of things. If what you did doesn't hold, and if you have an IAC you should check it and clean it, along with the throttle body. I had the same symptoms and this one did it for me.
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Old Nov 10, 2012 | 07:59 PM
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Year: 1989 Laredo
Model: Cherokee
Engine: 4.0 L 6 Renix
Default Good grounds, no hicups

The Peep's been hickupped and stumbled for couple years. Was goin from bad to worse. I was lookin for all sorts of causes, cps, tps sensors, fouled throttle body, wires, plugs, rotor cap, coil, trans loosing lockup, all sorts of questions, no definative answer. too costly to just start throwin parts.
Then I cleaned my ground connections, battery, engine, firewall. Since i had a dual post (top and side) battery, I added additonal ground from bat fender and another ground line to engine. The Peep is now smooth as a baby's back. No stumble, no hesitation, solid idle, solid voltmeter, 2000 km and not a mis or hickup.
For no cost other than the time clean your ground connections! Clean the +ve too. For a few bucks run another auxilliary ground wire.
Attached Thumbnails engine bucks out of nowhere-sidtermauxground.jpg  
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Old Nov 10, 2012 | 08:22 PM
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I will definitley give this a try tommorow peep, what type of mesh ground wire is that? It started back up after about 30 miles, ive cleaned and checked everything and nothing seems to be working, ill add a ground first thing tommorow
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Old Nov 10, 2012 | 08:38 PM
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The braid is tinned copper, got it at the Cdn Tire Auto Hardware store. Bolt on the fender is stainless, and the extra standard wire goes to bolt frontal on the block, just to be sure. Also disassembled, cleaned up and secured all the original ground contacts.
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Old Nov 10, 2012 | 08:48 PM
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Sounds good! Ill post tommorow and let you know if it worked for me, thanks again
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Old Nov 11, 2012 | 10:20 AM
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Alright, couldnt find a braided wire at any parts store close to my house so im just substituting with 10 gauge wire, 1/4 inch ring connector, and stainless self tapping screw, getting ready to throw it on, clean my connections and see how it does
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Old Nov 11, 2012 | 10:36 AM
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That will work. Even cleaning up the existing grounds and insuring the positive post is clean and tight is a good maintenance practice.
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Old Nov 11, 2012 | 12:49 PM
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Added the ground, cleaned the existing one, running as smooth as a baby, thank you so much

engine bucks out of nowhere-forumrunner_20121111_134910.jpg
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Old Nov 11, 2012 | 01:16 PM
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Okay.... Well it started doing it again! Fml i have codes for o2 sensors.. But its obd1 so it doednt tell me which one it is, how do i find this out?
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Old Nov 11, 2012 | 01:50 PM
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Originally Posted by 97xjCrow
Okay.... Well it started doing it again! Fml i have codes for o2 sensors.. But its obd1 so it doednt tell me which one it is, how do i find this out?
I believe you can do the (on then off key flick) x5 and watch the times the check engine light flashes. Right the times and the pauses down and it should give you a "code".
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Old Nov 11, 2012 | 01:56 PM
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Yeah i got a 2 1 code, which is oxygen sensor.. Only prob is it dorsnt say which one, im guessing upstream to be effecting my engine.. But do i only have 1 upstream?
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Old Nov 11, 2012 | 03:28 PM
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Originally Posted by 97xjCrow
Yeah i got a 2 1 code, which is oxygen sensor.. Only prob is it dorsnt say which one, im guessing upstream to be effecting my engine.. But do i only have 1 upstream?
Take them out and clean them. Then see what it does. Couldnt hurt.
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