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Unread 04-13-2011, 06:20 PM   #1
InEmberClad
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1989 YJ Wrangler 
 
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2.5 sputters, hesitates while accelerating

Hey all,
So my heep has been acting a little weird. All I can tell you that I know is wrong with it is that the clutch slave is in need of replacement. Not sure if this could cause it to behave the way it is though.
Only happens sometimes, but lately when I'm accelerating in first from a dead stop or getting up to around 2000 in second it sputters and hesitates a lot. To get it up to speed usually I need to be in third which is not ideal.
Fuel injector is 1 year old almost exactly and the fuel filter has been replaced within a couple months along with plugs and oil. Any thoughts?

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Unread 04-13-2011, 06:30 PM   #2
oldtime_ironman
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Throttle position sensor (TPS) comes to mind
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Unread 04-13-2011, 06:39 PM   #3
moonshinefuel
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Outside chance of a failing fuel pump, testing fuel pressure might not be a bad idea.
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Unread 04-13-2011, 06:47 PM   #4
oldtime_ironman
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Quote:
Originally Posted by moonshinefuel View Post
Outside chance of a failing fuel pump, testing fuel pressure might not be a bad idea.
x2 on the fuel pump too... ask me how I know!
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Unread 04-14-2011, 10:30 AM   #5
Que89YJ
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Does it matter if the engine is cold or warm?
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Unread 04-14-2011, 10:48 AM   #6
5.7YJ
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Check your intake manifold bolts and gasket. My bolts loosened up and sucked part of the gasket in and was acting just as you described.
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Unread 04-14-2011, 11:19 AM   #7
EABiker
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Quote:
Originally Posted by Que89YJ View Post
Does it matter if the engine is cold or warm?
Answer this one and you will know if it could be a bad sensor; some do nothing until the engine warms up!
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Unread 04-14-2011, 12:05 PM   #8
Whimppey
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I agree with EABiker. I had the same problem. Once it was warm it would sputter in lower gears. Replaced the upstream (?) O2 sensor, which only sounds intimidating and took longer to get the wranch out than to replace it. No problems since.
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Unread 04-15-2011, 03:06 PM   #9
InEmberClad
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Thanks for the tips guys! I will take a look at all these things on Sunday when I get a day off and report back.
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Unread 04-19-2011, 02:21 PM   #10
InEmberClad
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Alright, so I checked the fuel pressure and it was good, tightened some other things up, swapped fuel filter and plugs again just for good measure. Now it has a miss around 1200 rpm (idle) and it still hesitates at times. Problem is it will do the sputtering/hesitating thing both hot and cold, and then sometimes it wont do it for days.

I hate just throwing parts at it but you can't pull codes in Jeeps this old, and the TPS hasn't been replaced as long as I've had it. O2 sensor I did replace but over a year ago so it could be all fowled up too...

I did also notice that my plugs are getting fowled up fairly rapidly. Mostly the white kind, not the black crusty kind. Could this be part of the same problem?
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Unread 04-19-2011, 02:34 PM   #11
Drix
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What kind of plugs are u using? Also did u check the wires distributor cap and rotor? Clean the rotor and cap see
If that helps. If your wires are old ohm them out anything over 5 ohms is bad. But realistically 2 or higher u might need to replace them.


Sounds like your running hotter spark plugs if they are turning white try a cooler running plug like champion or autolights.
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Unread 04-19-2011, 03:02 PM   #12
InEmberClad
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I actually am running champs in there right now so we'll see if that helps the fowling problem, but it still has a little miss. I'll take a look a the cap and rotor and wires when I get home today, they're both about a year old but you never know when stuff will just crap out so that could be it.
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Unread 04-19-2011, 03:58 PM   #13
maddoc
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Here is a good site on interpreting your spark plugs

http://www.classictruckshop.com/club...park/plugs.htm
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Unread 04-19-2011, 08:15 PM   #14
tmontana
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I had the same issue and it became worse rapidly. The engine bucked at around 1800 rpm hot and cold when shifting from 1st to 2nd gear, replaced the throttle position sensor for $35 bucks, fixed it instantly.
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Unread 04-20-2011, 07:37 AM   #15
91yjrig
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I am going through it right now and it was my fuel pump its getting replaced today I did it all plugs wires cap button complete tune up and then I would completely lose power so your pump may be going out cause mine would start off in first fine but Escondido and on I would completely lose power and it would almost die. And just yesterday the fuel pump went completely.
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