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Unread 10-19-2013, 03:58 AM   #1
jeepyj13
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1993 YJ Wrangler 
 
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Location: greenville, mississippi
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1993 jeep yj bogging down.

What up yjers. I need some help esp. from some who has experienced this issue before. For the past couple of months my 93 jeep yj 4.0 w/3 sp auto nhas been bogging down when working hard on hwy. I would be doing 65mph for a period of time and then I would feel a sudden jerk kinda feels like a sudden hard wind hitting head on. Then it begins the rpms starts to drop, speed starts to reduce, and if I press the gas pedal harder the engine will sound as it was starving for fuel and sputtering. If I pull over, cut the engine off for a least a minute, and start it back up the jeep runs fine on hwy again. I thought it only did this in hot weather, but now it's cooler and still does it. Things I looked up on here that could possibly be the problem, but not limited are TPS, Fuel filter, fuel pump, clogged cat, o2 sensor. Things I replaced so far are a new distributor cap and rotor, map sensor, cts, fuel filter. I haven't replaced o2 yet and cat converter. I checked fuel pressure btw and it's where it should be. Unfortunately I can't pulling codes cause the cel hasn't worked since I got the dang thing. Help or suggestions would be greatly appreciated.

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Unread 10-19-2013, 04:32 AM   #2
Islander_child
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1989 YJ Wrangler 
 
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Location: San Antonio, Texas
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Just a thought but the fuel lines haven't been replaced have they? Could they be collapsing under vacuum?
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Unread 10-19-2013, 05:21 AM   #3
billybooster2
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It could be injectors crapping out under loAd or duel pump ditto.

Trace the pink wire to the cel. I think its pink. Might really help

Could be a blocked cat if u have one
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Unread 10-19-2013, 06:30 AM   #4
ashland82391
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Quote:
Originally Posted by jeepyj13 View Post
What up yjers. I need some help esp. from some who has experienced this issue before. For the past couple of months my 93 jeep yj 4.0 w/3 sp auto nhas been bogging down when working hard on hwy. I would be doing 65mph for a period of time and then I would feel a sudden jerk kinda feels like a sudden hard wind hitting head on. Then it begins the rpms starts to drop, speed starts to reduce, and if I press the gas pedal harder the engine will sound as it was starving for fuel and sputtering. If I pull over, cut the engine off for a least a minute, and start it back up the jeep runs fine on hwy again. I thought it only did this in hot weather, but now it's cooler and still does it. Things I looked up on here that could possibly be the problem, but not limited are TPS, Fuel filter, fuel pump, clogged cat, o2 sensor. Things I replaced so far are a new distributor cap and rotor, map sensor, cts, fuel filter. I haven't replaced o2 yet and cat converter. I checked fuel pressure btw and it's where it should be. Unfortunately I can't pulling codes cause the cel hasn't worked since I got the dang thing. Help or suggestions would be greatly appreciated.
Sounds like the o2 sensor on the down tube to me. This is exactly what happened to me.
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Unread 10-19-2013, 11:37 AM   #5
jeepyj13
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1993 YJ Wrangler 
 
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I will get a o2 nxt wk when I get paid. Yes I still have the cat converter, but the po replaced the stock one 3yrs ago before selling it to me. Still has the paperwork ha. I will trace the cel wire light soon to get the light to work. Heck the light has probably been triggered long ago, but I never knew. I drove home from work this morning on my 40mi commute and nothing happened. It held 65mph and purred smooth all the way home. Seems it does it when it wants too. It was about 56 degrees outside though. I keep updates after o2 replacement.
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Unread 10-19-2013, 11:42 AM   #6
jeepyj13
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1993 YJ Wrangler 
 
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Quote:
Originally Posted by Islander_child
Just a thought but the fuel lines haven't been replaced have they? Could they be collapsing under vacuum?
No never been replaced. Everything on the jeep is stock 20yr stuff. Just recently the brake booster went bad and stock radiator as well. I replaced both. The sensors on engine were stock orig. equipment, but since the bogging I replaced half of them.
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