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Old 06-26-2014, 08:30 PM   #1
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Arrow Do all jeeps need time to warm up before driving

Hi, I bought a 98' wrangler last week. When I bought it the previous owner said because of the oil pan the car has it has to run for a little before driving. Everytime after I leave the car for a hour or more it will drive fine then randomly start to put put and it drives rough and you hear popping so you put it in nuetral(five speed) and coast for a little while it goes through an episode then it will run fine for the rest of the time and until you leave it for a while. It doesn't bother me that much but sometimes it happens right down the block and sometimes it happens when I get on the main road so it can be a bit dangerous. I'm wondering if this is a common thing and if it can be fixed. It's a four cylinder with 111k miles

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Old 06-26-2014, 08:44 PM   #2
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...the previous owner said because of the oil pan the car has it has to run for a little before driving.
27 years of continuous Jeep ownership and I never knew that!!! (Which is not to say that I didn't know that Jeeps had oil pans.)

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Old 06-26-2014, 08:55 PM   #3
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Car?
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Old 06-26-2014, 09:11 PM   #4
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I would say that is not common, sounds like a fueling issue.....

Maybe fuel filter, pump or injectors....
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Old 06-27-2014, 03:54 AM   #5
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I know exactly what you are talking about, my 97 2.5 does the same thing. I am pretty sure it is due to my fuel pressure regulator/filter needing to be changed. Tell me, does it take longer to start after it has been sitting? My theory is that when the fuel drains back into the tank since the valve is not holding pressure, some air gets into the fuel line. When it starts, after about a minute or less of running fine, that 'air bubble' reaches the fuel rail and causes a slight stumbling for a few seconds. I usually can just 'rev through it' now that I expect it. I have the part, just gotta drop the tank and change it. One thing you can do to check if that's the problem is before you start your JEEP, turn the key to the on position without starting the engine, wait a few seconds, then repeat that twice, then start it. If it starts a lot quicker, that's probably your problem.
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Old 06-27-2014, 06:10 AM   #6
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I would lean towards the fuel pump also.
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Old 08-20-2014, 01:39 PM   #7
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Forgot to post that I took it to a friends shop and they said it wasn't throwing any codes and the fuel pump was fine. The rest of summer went by and I started researching again last night And came across a thread with the same problem. I ended up unplugging the o2 sensor and the problem did no occur. Still no codes so I'll look into replacing it
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Old 08-20-2014, 01:52 PM   #8
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Start the engine, give it a couple seconds for oil pressure to build and your good. I don't know what could possibly be special about our oil pans that would require a warm up period.
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Old 08-20-2014, 06:57 PM   #9
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I only warm mine up when its cold.

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