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New Parts, worse mileage...

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Old Apr 27, 2011 | 11:05 AM
  #1  
Green B's Avatar
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Default New Parts, worse mileage...

'92 cherokee. Last month I changed the O2 sensor, E3 plugs, exhaust, rugged ridge cold air intake, etc. I reset the computer, and I'm getting WORSE gas mileage.... Any ideas?
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Old Apr 27, 2011 | 11:08 AM
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Are the plugs platinum? Platinum doesn't always mix well with the 4.0
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Old Apr 27, 2011 | 11:13 AM
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From: Visalia, Kalifornia, ussa
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Yeah, do you enjoy listening to your new exhaust???? Cause I'd bet your pushing down on the gas pedal so you can hear it as much as possible....
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Old Apr 27, 2011 | 12:56 PM
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From: Flint/Asheville
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yea ditch the E3 plugs. Copper Champions are the best for the 4.0
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Old Apr 27, 2011 | 01:40 PM
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Originally Posted by 93gc40
Yeah, do you enjoy listening to your new exhaust???? Cause I'd bet your pushing down on the gas pedal so you can hear it as much as possible....
x2 more vroom vroom less mpgs, and take the plugs back get champs
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Old Apr 27, 2011 | 01:49 PM
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e3 plugs=holy pistons
get rid of them.
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Old Apr 27, 2011 | 02:34 PM
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Engine: 4.0 I-6 H.O.
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have you checked if any vacuum lines are disconnected? it could be pulling unmetered air causing the o2 to read erroneously
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Old May 2, 2011 | 09:47 AM
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Thanks guys, I will ditch the plugs and see if that does help. I dont know about the vac lines though. I guess that means, i'll be in my happy place... shoulder deep in the engine bay!
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Old May 2, 2011 | 10:20 AM
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Originally Posted by Green B
Thanks guys, I will ditch the plugs and see if that does help. I dont know about the vac lines though. I guess that means, i'll be in my happy place... shoulder deep in the engine bay!
just get some carb cleaner and spray it around the vac lines, if you hear the engine want to rev, you have a leak.

good luck
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Old May 2, 2011 | 04:32 PM
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Give us some gas mileage numbers.

Need at least three samples.

Must be calculated. Miles driven divided by gallons consumed. Trying to extrapolate mileage by how many miles you get to a tank of gas isn't particularly accurate.

And I agree with the others on the E3. They are overhyped and for the 4.0, give you no advantage. Champion copper plugs properly gapped to .035, changed every 30k.
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