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Old 02-23-2006, 01:31 PM   #1
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gas mileage

Hey guys i hjave got a quick question for yall. on my 94 yj i am getting horrible gas millage. it went from like 18-19 to like 14-15 so it sucks really bad. i have just done a tune up except for an oil change does anyone have any ideas that could help me get my gas millage back.alsoi was look and my throttle body had oil all over it so i took it off and cleaned it out. and my air filter had a little bit of oil in it. could that be my intake gasket or something. anyhelp would be great.

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Old 02-23-2006, 02:39 PM   #2
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Is there anything else you have recently done to it that might have caused this? Like lifting it or putting bigger tires on?

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Old 02-23-2006, 03:28 PM   #3
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Oil in your air filter and your throttle body? Sounds like you have really bad blow-by meaning you could have bad rings. Being that this wouldn't just suddenly pop up out of nowhere, check your seals around your throttle body. If you just pulled it you may not have seated it back correctly causing a vacuum leak which will kill your gas mileage. Use a can of carb cleaner and spray around it while it's running. When the engine RPM changes you've hit the spot.
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Old 02-23-2006, 04:13 PM   #4
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Check the PCV tube on the valve cover. Mine did the same thing and it was clogged shut.
Have you changed the O2 sensor?
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Old 02-23-2006, 05:51 PM   #5
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Replace your PCV. It's gone bad. The oil in the air filter will tell you every time.
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Old 02-23-2006, 07:35 PM   #6
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Ditto...change the pcv valve first. I would think that you would get a check engine light if the O2 sensor was bad, but you never know. If this is a sudden thing with no other mods that could have effected it, I would try hunting down a vaccuum leak as naviathon suggested. It may not be at the throttle body, could be anywhere.
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Old 02-23-2006, 11:26 PM   #7
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well thanks guys i checked the pcv vale and it was bad. so i am going to replace it in the morning. and i believer that i have found the vaccum leak. it apears to be the intake gasket so i am hopefuly going to replace that also. anyone know how hard it is to do that doesn't really look that hard
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Old 02-24-2006, 06:35 AM   #8
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It's not difficult, I did mine in about 2 hours, but I had other things I was doing with it. It's a one piece gasket for both the exhaust and intake and they use the same bolts for both.
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Old 02-27-2006, 10:25 PM   #9
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well i got it done.it was pretty easy. when i had got it all apary i found that there was no gasket on the manifold at all. and the very back bolt on the manifold was broken off in the head so that was a lot of fun trying to get it out but it is done and it is running great thats for all yalls advice.
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Old 03-01-2006, 07:53 PM   #10
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Glad you got it all figured out. Weird that thre was no gasket at all...guess that explains the leak.

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