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Old 02-12-2018, 08:56 PM   #1
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Default Any Jeep Guys or Gals out there?

So I bought a new project. It's a 1993 Wrangler (YJ). I have a miss in it that I can't figure out. I have done a full tune up, Temp sensor, Map sensor, throttle position sensor, fuel pump, but it's still running very rich. It's a 4.0 litter H.O. Any recommendations?
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Old 02-12-2018, 09:09 PM   #2
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Possible head gasket maybe
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Old 02-12-2018, 09:19 PM   #3
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Possible head gasket maybe
I thought that but it runs very good outside of the slight miss and burning rich. I think it may be the Manifold air intake sensor.
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Old 02-13-2018, 04:23 PM   #4
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There are Jeep forums you can join & ask questions. I have a '99 but no problems with it.
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Old 02-13-2018, 05:19 PM   #5
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Have you checked the oxygen sensor? I have seen them lock into a lean code causing the computer to feed more fuel into the engine which causes a rich condition. They do not always throw a code. If you had a reader to plug into it then you could see if the oxygen sensor is working by looking at its voltage. Could also be injectors... Air cleaner good? Compression good on all cylinders?
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Old 02-13-2018, 07:02 PM   #6
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Have you checked the oxygen sensor? I have seen them lock into a lean code causing the computer to feed more fuel into the engine which causes a rich condition. They do not always throw a code. If you had a reader to plug into it then you could see if the oxygen sensor is working by looking at its voltage. Could also be injectors... Air cleaner good? Compression good on all cylinders?
Will a o2 sensor cause it to miss. It feels like it's running on 5 cylinders. I have not do a compression check yet, that will be tomorrow. I thought a o2 sensor would cause a check engine light?
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Old 02-13-2018, 09:12 PM   #7
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Will a o2 sensor cause it to miss. It feels like it's running on 5 cylinders. I have not do a compression check yet, that will be tomorrow. I thought a o2 sensor would cause a check engine light?
O2 sensor won't normally cause a miss but if it's running rich enough it could foul a plug. O2 sensor does not always turn on the light. I have had a couple vehicles with no light but crappy fuel mileage. O2 sensor every time..

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Old 02-13-2018, 09:13 PM   #8
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Air Idle Control.
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Old 02-13-2018, 09:31 PM   #9
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Air Idle Control.
That's what I'm changing tomorrow.
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Old 02-14-2018, 08:07 AM   #10
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We have a 98 that we've owned 2xs now....My BIL passed and we bought it back from his widow. It was coated inside and out in mud so I took about 3 hours and cleaned it. Now it has the check engine light on and it has a miss too... so I probably jacked something up too. The miss I feel is sorta like a sputter as you are driving down the road like it's loosing fuel. I've ran premium and sea foam in it but don't drive it too much...
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