Gas mileage and RF noise Improvement all in one fix! - Ranger-Forums - The Ultimate Ford Ranger Resource

2.3L & 2.5L I4 Tech General discussion of 2.3L and 2.5L I4 Ford Ranger engines.

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Old 05-28-2009
Thread Starter
Join Date: Jan 2007
Location: Tacoma, WA
Posts: 45
Gas mileage and RF noise Improvement all in one fix!

Hello all,

I recently heard lots of buzzing in time with engine speed (especially when using the radio tuner iPod adaptor, and noticed gas mileage was down to about 26 MPG. I usually average about 29-32 (this is a 94 2.3L 4-cyl, 5-speed) so I knew something was up. I changed the plug wires and all is well. My hypothesis is that the spark was grounding out to the block on occasion causing the radio frequency noise. I was back to about 29 MPG last time I checked. The #3 cylinder plug under the intake manifold is difficult to access but using a long set of needlenose pliers with a curved end allowed me to reach right through the opening between the intake manifold branches and pull the cap. The right tool for the job makes it much easier than removing the whole manifold. Another recommendation is to disconnect and replace only one lead at a time (especially on the twin plug engines) so you get the right firing order. It's easier to match lengths that way too.

Hope this helps someone!

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Old 05-28-2009
FRJR's Avatar
Join Date: Sep 2008
Location: Houston area
Posts: 52
I think I know of the problem too, but never suspected that. My friend's Silverado did that with the FM tuner and it sounded really high pitched but followed the RPMs. Glad to know it helped you.
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