at a loss on mpg loss

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Mar 23, 2014 | 01:21 PM

#31

skife

Seasoned Member

Joined: Nov 2013

Posts: 469

Likes: 3

Model: Cherokee

Quote:

Originally Posted by kjc

(snip)

Ya? And what could emissions possibly have to do with fuel economy, right? You might want to research O2 sensors and find out how they work. I could explain in some detail, but you're not really worth my time.

What's the voltage reading on the downstream o2?

Mar 23, 2014 | 04:59 PM

#32

travy

Thread Starter

Newbie

Joined: Mar 2014

Posts: 8

Likes: 0

Model: Cherokee

Quote:

Originally Posted by RTorrez1

Since you have done so much you would think that you would have noticed some increase in your fuel mileage. How is you fuel cap, Is it a locking cap? Maybe someone is stealing it? Just one more thing to look at.

no one is stealing my gas.

Quote:

Originally Posted by yarom

Where in Issaqua?

Grange Co-Op 145 Ne Gilman Blvd

so is the downstream critical to being changed? would hate to throw another $50 at it if its not gonna fix it.

Mar 23, 2014 | 05:21 PM

#33

yarom

Senior Member

Joined: Mar 2012

Posts: 512

Likes: 1

From: Bellevue, WA

Year: 1998

Model: Cherokee

Engine: 4.0L

Thanks. I think it is, so changed both.

Mar 23, 2014 | 05:22 PM

#34

Bustedback

CF Veteran

Joined: Feb 2010

Posts: 12,367

Likes: 23

From: Oroville, CA

Year: 1995

Model: Grand Cherokee

Engine: 4.0 with all of the noise and clatter

The down stream O2 is not critical to the fuel mapping strategy, it monitors the health of the catalytic converter. The sensors that help make all of the fuel strategy are the MAP and TPS sensors, about 65%.

Last edited by Bustedback; Mar 23, 2014 at 08:23 PM.

Mar 23, 2014 | 08:19 PM

#35

bloodysamflint

Newbie

Joined: Mar 2014

Posts: 5

Likes: 0

Model: Cherokee

Have you stuck a fuel pressure gauge on it and made sure your regulator is working correctly? Stuck regulator boosting fuel pressure might keep you running rich...

Mar 23, 2014 | 08:29 PM

#36

98redjeep

Member

Joined: Dec 2013

Posts: 148

Likes: 1

Model: Cherokee

Did you gap your plugs properly? I just did a tune up. Whoever put the plugs in before had a huge gap. Along with cap rotor and wires I just gained 2.5 to 3.5 mpg! Up to 20-21 now.