Civic VX cant get over 41ish MPG

[Jakins]

looks beautiful man! no slam that thing on the ground! haha. but yah, with my hx i couldnt get that thing over like 41 until i got an mpguino. from then on ive been getting no lower then 47 mpg. its worth the investment. it will pay its self off in 3 tanks.

[Rusty94cx]

Looks nice. Hook up a mpguino or even a volt meter to the 02 and you'll see how to keep it in lean burn. It's the secret. Until I figured it out I was at the 40-45 mark. Sometimes you need to be in 4 th on the freeway to keep the lean burn. It's pin d14 and d16. Orange with stripe and blue with a stripe I believe. There is a lengthy post on how to do it. Good luck. what rpms are you turning on freeway at say 65? 2000-2100 them you at least have the right trans.

[jlk16188]

Well i took my intake manifold off thinking my EGR passages were clogged. Drilled out and removed the plugs all to find the ports were perfectly clean. So, i drilled and tapped the ports for plugs and reinstalled the intake and cleaned the EGR. I also installed the missing resonating chamber of my stock intake which was missing when I purchased the car and I bought new injectors. I bought a set of 4, Osidetiger's Custom Fuel Injectors off ebay and installed them as well.

First tank out, i hit 47.1 MPG. Im quite happy with these results and will be looking into so instrumentation next.

Thanks everyone for the help.

[jooky]

so your egr wasn't dirty.. seems like the new injectors gave you an extra 7 mpg?

[jlk16188]

egr had some dirt in it, but not enough to clog it. Im thinking the old injectors were leaking

[jlk16188]

been doing great, high 40's for the past few weeks

[fifteenwindow]

From that May 21st picture it looks like your vx may be missing the rear diffuser that guides air past the rear bumper behind driver's rear wheel. That piece improves aerodynamics (FE). Check for the front pan under the engine compartment, too.

[jlk16188]

Well I beat my personal best this past week. I drove the car from Pittsburgh to Chicago and back for work averaging in the high 40's until I filled up at a Shell station along the way home.

I managed to pull 56.5 MPG's throughout this tank. I was pretty happy since I set a goal of breaking 50 MPG's without instrumentation.

I beat that goal so I bought an MPGuino! Installed it this weekend and am seeing a $-5 MPG gain on my daily commute while still tinkering with it.

[jlk16188]

Originally Posted by fifteenwindow

From that May 21st picture it looks like your vx may be missing the rear diffuser that guides air past the rear bumper behind driver's rear wheel. That piece improves aerodynamics (FE). Check for the front pan under the engine compartment, too.

Thanks for the heads up, my rear panel is there but My front under panel isnt there? My VX looks just like my CRX underneath and i wasnt aware there was an additional front panel? Do you have a parts number or diagram for this?

[fifteenwindow]

Its called a splash shield, part numbers 74111SR3A01 or 74000S01A00. There is a diagram at cmsnl.com, but I don't have enough posts on ecomodder to allow me to link it for you.

JCWhitney sells replacements for $40, but I have no experience with them.

Congrats on blasting past your mileage goal.