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  #1  
Old 12-19-2010, 07:11 PM
rleighton rleighton is offline
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Join Date: Dec 2010
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Unhappy poor fuel economy after changing plugs/wires

I am a NEW member from Windsor, Vermont. Bought this 80,000 mile 2.5L 4 cyl truck a few months ago and noticed the plugs were very rusty so I decided to have the local garage replace them and this is when the problems began. THEY DAMAGED THE PLUG WIRES WHEN REMOVING THEM and charged me for the new ones. Within ten miles of leaving the garage the engine began to missfire and the check engine light came on. The error code revealed a cyl 1 AND a cyl 4 missfire. After much discussion (I'm being nice here) the garage agreed to replace the plugs and wires and clear the error codes. Now the engine runs smoothly but the fuel economy went from 25 mpg down to 18-19 mpg and power is less especially in 4th & 5th gear. It also missfires when the weather is wet. What gives??

P.S. they did not remove the intake when changing the plugs.
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2001 Ford Ranger XLT Regular Cab, 2.5L 4 cyl, 5-speed, Stepside.

Last edited by rleighton; 12-19-2010 at 07:21 PM. Reason: more info
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  #2  
Old 12-19-2010, 07:23 PM
WildlandFirefighter WildlandFirefighter is offline
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Posts: 394
Default Re: poor fuel economy after changing plugs/wires

Check the timing...it can be off.
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1979 Ford F150 4X4, 7.5L, C6, 38s Super Swampers TSL

1978 Ford Courier 4x4, 2.3L carbed, 5 spd manual, dry-rotted tires

1985 Ford Ranger 4x4, 2.3L FI, 5 spd manual, 29s Power Kings

1990 Ford Bronco 4x4, 4.9L, 5 spd manual, 31s Maxxis Bighorns
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  #3  
Old 02-12-2012, 10:38 AM
rangerboy1994 rangerboy1994 is offline
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Join Date: Jun 2011
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Default Re: poor fuel economy after changing plugs/wires

I've had my plugs changed by a shop once. Same thing happened to me..They didn't even gap them correctly. The closest one was like .035 off. Get a gap tester and make sure theyve don't their job right.
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1994 Ford ranger. 91k miles. Auto trans. 3.0lwith a rod shot thru block. Flowtech Terminator exhaust w/ turndown. 27X8.5X14 General Grabber AT2 tires. Pretty much a stock truck. Hoping to resurrect her pretty soon
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  #4  
Old 02-12-2012, 08:09 PM
Lalogga Lalogga is offline
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Join Date: Jan 2012
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Default Re: poor fuel economy after changing plugs/wires

I have also heard that motorcraft parts work best on these engines. What brand plugs and wires were used?
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  #5  
Old 02-14-2012, 12:23 PM
CDA CDA is offline
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Default Re: poor fuel economy after changing plugs/wires

Check to see there all tightened down and that the wires are connected
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  #6  
Old 03-01-2012, 03:12 PM
StockBlueFord StockBlueFord is offline
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Join Date: Feb 2012
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Default Re: poor fuel economy after changing plugs/wires

Quote:
Originally Posted by rangerboy1994 View Post
I've had my plugs changed by a shop once. Same thing happened to me..They didn't even gap them correctly. The closest one was like .035 off. Get a gap tester and make sure theyve don't their job right.
agreed. check the gap. they must have really not liked you in order to leave the plugs loose and then not even gap them. good luck!
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2011 Ranger XL Extended cab, 2x4, 2.3 L Duratec, Automatic, Mis-colored Leer camper shell, Ultragauge, LED plate bulbs, DDM "cree" reverse lights. Staying as stock as possible
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Originally Posted by robertmcclure View Post
and yeah, you wanna spend dat moneh on dat pusseh!
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ignition wires, poor mpg, spark plugs

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