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fuel mileage drop after replacing coils?

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Old Dec 1, 2016 | 10:33 PM
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Bobby Kienitz's Avatar
Bobby Kienitz
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Default fuel mileage drop after replacing coils?
i replaced the 3,4,5,6 coils and plugs the car runs great but i have noticed a dramatic drop in mileage. it went from getting 150 on the first 1/4 to getting maybe 100. any help would be great
 
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Old Dec 3, 2016 | 10:37 AM
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did the intake manifold have to be removed to change the coils?

If the vehicle uses speed density fuel metering, a vacuum leak will skew the map sensor and enrichen the fuel trim.
 
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Old Dec 3, 2016 | 03:39 PM
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Yes the manifold had to be removed. I checked many times and do not hear a "sucking" sound
 
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Old Dec 3, 2016 | 05:29 PM
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check the fuel trim with a scan tool, if its skewed at idle but within +/- 10% at 2500rpm...you have a vacuum leak.
 
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Old Jan 7, 2017 | 02:56 PM
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Did you disconnect the battery?
 
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Old Jan 7, 2017 | 03:25 PM
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Do MPG calculations with actual math and measurable fuel volumes. Don't use calibrated eye method, 1/4 tank guesses.
 
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