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post #1 of 5 Old 02-19-2011, 06:32 PM Thread Starter
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1998 XJ Cherokee 
Join Date: Aug 2010
Location: Cuyahoga Falls
Posts: 14
Need opinions

So I've been having a fuel issue and am getting no mpg right now like maybe 10mpg at the most on highway. I also am hearing air under the hood when I rev at idle or when I take off/ shift (sounds like a semi shifting) and rough idle off and on. Now someone told me on here my fuel issue could be vacuum line related. Is it possible that a vacuum line broke, is causing the rushing air noise (very low toned and loud), rough idle, and the fuel issue? Thanks ahead, Joe.

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post #2 of 5 Old 02-19-2011, 08:37 PM
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1990 XJ Cherokee 
Join Date: Jan 2010
Location: york pa
Posts: 41
make sure to check all your vacuum lines im pretty sure this is whats making it run this way even a slight pin hole could make it do this kind of thing
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post #3 of 5 Old 02-19-2011, 09:38 PM Thread Starter
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1998 XJ Cherokee 
Join Date: Aug 2010
Location: Cuyahoga Falls
Posts: 14
Will do, I was thinking that same thing. Also I got one other question. My steering gearbox is leaking, it's soaked with fluid down the side but the power steering reservoir is still full isn't that what feeds the gear box? I'm not having any steering issues so how long could I let this go? Should I just go ahead and get the Durango steering box as a replacement?
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post #4 of 5 Old 02-19-2011, 10:17 PM
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2000 XJ Cherokee 
Join Date: Mar 2010
Location: Scottsdale, AZ
Posts: 677
For fuel: first, make sure your warming up. Engine should be operating in the 205-210 range. If anyone has put a low temp thermostat in, the engine's running "open loop" all the time. Also check the temp sensor. If it's failed, it can also cause the same problem.

Check/change your O2 sensors. As the sensor goes bad, it will work well enough to keep from throwing a code, but gives a false "lean" reading, and the computer tosses more fuel into the mix.

Power steering: Is it leaving a puddle? If not, just watch the level and leave it alone. Deal with it when it starts to drip. You might want to clean the area really well and confirm the leak location. It might just be a loose fitting or pin-hole in a hose.

"Never attribute to malice that which can be adequately explained by stupidity, but don't rule out malice."
My other car is also a Jeep,.. and so is the other one,.. and that one too. How many do you own before it's "a herd" ?
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post #5 of 5 Old 02-20-2011, 10:19 AM Thread Starter
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1998 XJ Cherokee 
Join Date: Aug 2010
Location: Cuyahoga Falls
Posts: 14
Alright I'll check the o2 sensor, the thermostat and temp sensor I know are working because when the temp sensor got bad in my grand cherokee the engine light was on almost immediately. But I will check the temp sensor, thanks for the advice.
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air , cherokee , fuel , intake , vacuum

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