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Old 07-10-2003, 11:21 PM   #1
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Default why did gas mileage go up so much

i took the tps sensor off my parts car (buick lesabre crashed) and i put it in my car and my gas mileage has sky rocketed. before i had a tps off a 3100 an di was getting about 270 or so a tank and now i get almost 400 a tank!! :o why? im not complaining but i just dont understand why it jumped so much and i got lots of high end power
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Old 07-10-2003, 11:26 PM   #2
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If it was a bad TPS, then the computer was screwing things up. It would give you unnecessary amounts of fuel or not enough , or wrong air amounts of air intake and that may have screwed your milage.
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Old 07-10-2003, 11:34 PM   #3
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o ok thanx
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Old 07-10-2003, 11:37 PM   #4
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That could be it. I don't know too much about this.
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Old 07-11-2003, 02:04 AM   #5
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Yep it was calculating the air/fuel mixture incorrectly due to the ECM not knowing actual position of the throttle. Yours may have just been miscalibrated, not necessarily bad.
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Old 07-11-2003, 02:14 AM   #6
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If you were running too rich (sounds like you were) you may be looking at a premature O2 sensor failure. They don't like all that unburnt fuel. Keep an eye on the mileage for awhile.
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Old 07-11-2003, 05:50 AM   #7
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That is exactly what happened to me, I replaced my TPS and my mileage skyrocketed, a beautiful thing isn't it.
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Old 07-11-2003, 10:35 AM   #8
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what do u mean by keep an eye on my gas mileage? cuz the o2 is a year old.
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Old 07-11-2003, 02:29 PM   #9
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How much is a TPS? My milage isn't good right now, infact it'* downright bad. I'm having my plugs and wires replaced soon, and i might do my O2 while i'm at it. Is there a simple way to check if the TPS is calibrated or not?
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Old 07-11-2003, 07:49 PM   #10
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Check for leaks anywhere before you check your TPS, but you can go to any shop and have the computer read, if the TPS is bad it will say and the cost to change mine was about $190 can including labour
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