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Mileage has plummeted

 
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impala2k
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PostPosted: Sat Jan 28, 2012 3:10 pm    Post subject:  Mileage has plummeted Reply with quote

I think I may be having some tranny issues. Since I have had the car there has always been a whine ( not super charger its a 3.4l, though it sounds like one at times) But it seems as the whine has progressively gotten louder, the mileage has gone down. I used to get about 20 in town, last fill I calculated 17.5. the tank before around 18, and before that around 18.5 Terrible! No change in driving, still babying it. tune up was done about 18k miles ago with all AC Delco parts. I don't know what is going on. My transmission used to occasionally slip from 1 to 2 but that has not happened in a long time. Fluid levels are normal. Fuel filter has been changed within last 5k. I am at a loss, at only 105,xxx miles. Any Ideas?

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IffyG
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PostPosted: Sat Jan 28, 2012 3:16 pm    Post subject:   Reply with quote

Have you checked that all the pulleys are spinning freely? I had an issue with the AC pulley dragging on the Intrigue and it was killing my mileage.

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topgun
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PostPosted: Sat Jan 28, 2012 3:54 pm    Post subject:  Milage Reply with quote

Other whines from under the hood would be from Power steering pump or alternator. Neither would contribute to lower gas mileage.
Winter weather will contribute to lower gas mileage. Tend to idle car longer to get it warm.
You may want to do a trans service with new filter, help with slipping. Not sure on much else. Cool

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impala2k
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PostPosted: Sat Jan 28, 2012 4:20 pm    Post subject:   Reply with quote

I have not checked the pulleys. Will have to find time this next week to take the belt loose and do so. As far as transmission service I had the pan dropped and new filter at around 75,xxx miles ish. I am going to try running tires with more pressure than the factory recommended for the car. Tires are Pirelli P6's rated max 55psi so I may try like 40 psi. I just can't believe how crappy my mileage has been. If I wanted less than 18mpgs I would have just kept my 1986 Buick Park avenue. lol.

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PostPosted: Sat Jan 28, 2012 9:20 pm    Post subject:   Reply with quote

My car whined a bit when the fuel filter and catalytic converter got plugged up.

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impala2k
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PostPosted: Sun Jan 29, 2012 3:07 am    Post subject:   Reply with quote

Lingenfelter wrote:
My car whined a bit when the fuel filter and catalytic converter got plugged up.


Just changed the Fuel filter, and about the cat...had that taken care of too...

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grimsin
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PostPosted: Sun Jan 29, 2012 9:47 am    Post subject:   Reply with quote

was you 20 mpg intown before or after the 65mm tb install? bigger tb and cold winter air=alot more fuel?

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impala2k
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PostPosted: Sun Jan 29, 2012 1:59 pm    Post subject:   Reply with quote

grimsin wrote:
was you 20 mpg intown before or after the 65mm tb install? bigger tb and cold winter air=alot more fuel?


hmmm.... This could make sense.. it does seem like its been getting colder as its been getting worse...I can't seem to remember when I did the TB though, lol I think this may be the first winter with it.

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PostPosted: Sun Jan 29, 2012 3:00 pm    Post subject:   Reply with quote

I noticed that after I changed the lower intake gaskets (even though my engine is a 3.8, same should apply to 3.4) I picked up like 5 mpg.
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topgun
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PostPosted: Sun Jan 29, 2012 4:47 pm    Post subject:  Milage Reply with quote

Also, my mileage has gone down from around 20mpg in summer to now around 17mpg. Pretty much same journeys, driving conditions. I am running Pirelli P4's at about 32psi. Gotta move south or south west. Dang winters. Cool

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