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Increased my MPG & helped my rough idle a bit thanks to this site

bjtheman427

Member
Joined
August 2, 2013
Messages
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City, State
Texas
Year, Model & Trim Level
2003 Ford Explorer EB
I've got an 03 Eddie Bauer V6 4.0 that I bought used and have been trying to improve the lifespan of it as well as increasing the mpg and fixing this rough idle.

I had done all these first:
Cleaned TB & MAF
Air box mod
Sea foam through brake booster
Fuel injection cleaner through tank
New spark plugs & wires
New fuel filter

Now with all this done I was seeing about 14mpg hwy and still had a rough idle.

Just recently did these:
K&N Air filter
New Motorcraft IAC
Started using 89 Octane

Currently, idle is better but still noticeable. I have read a lot on here though that the V6 4.0 is just very common with this. I'm now seeing 17-18 MPG Hwy which really has me feeling better with this stuff.

I have 2 more upcoming things to be done:
Need an alignment
New Accel Coil Pack on the way

Hoping for just a bit more from these but overall definitely appreciate all the insight from everyone here.
 






Well, installed the Accel Coil Pack and it feels like the engine idles a little rougher now!

Any ideas?
 






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