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Pontiac Forum: Mileage loss after tuneup
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  #1  
Old April 14th, 2018, 08:00 PM
Anthony2 Anthony2 is offline
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Mileage loss after tuneup

About a month ago I gave my 09 torrent a tune-up. Since then I've noticed a drop in fuel economy. I went from 26mpg before tuneup to 20 after. Any ideas what the cause could be? Same gas station weekly. Same brand of plugs and wires.
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Old April 14th, 2018, 10:04 PM
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melsg5 melsg5 is offline
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Did you go over what you did?
Leave a hose disconnected?
Did you check the plug gap?
what exactly did you replace?
Have you done this before?
Did you check spark plug wire resistance with an ohm meter, old wires are easy to break internally.
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Old June 22nd, 2018, 01:55 AM
Blake06torrent Blake06torrent is offline
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Id check the plug gap just like melsg5 said. Moat ppl who dont know much but know a little will change the plugs but dont know you have to gap them even pre gapped plugs can be ****ed out of whack from shipping. Id check that first.
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Old June 22nd, 2018, 01:58 AM
Blake06torrent Blake06torrent is offline
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When you say tune up what do you mean? Plugs wires oil air filter.... what all did you have done?
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