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Brandon
Dodge Dakota
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7/14/2009
13:29:58
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 Subject: 15mpg?
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Message:
Hey guys im running into a problem with my 3.9L engine. I used to get 16.25mpg but in the last 7,000 miles it has gone down to 15mpg. I did a tune up on the engine 20 or 30,000 miles ago and had walmart do there fuel system fogging treatment 6,000miles ago. I have a 1.7 rockers, intake, exhaust, V8 TB, superchips on 87 setting, and use quality oil. The engine has 120,000 miles.
Any ideas on what this could be?
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Brandon
Dodge Dakota
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7/14/2009
13:51:08
|  RE: 15mpg?
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Sorry, I didnt mean to post this topic twice.
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well
Dodge Dakota
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7/14/2009
14:14:56
| RE: 15mpg?
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Message:
What year?
Did you check for codes?
Does the engine ping?
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Brandon
Dodge Dakota
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7/14/2009
17:05:51
| RE: 15mpg?
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Its an 03 QC Auto and 2WD. No pinging and no codes. That is why i am stumped.
I just cleaned my K&N filter as well.
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daddio
Dodge Dakota
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7/14/2009
17:15:29
| RE: 15mpg?
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Message:
Could be an O2 sensor about to take a dump and just ahdn't thrown a code yet. When those start to go you'll start to see a decline in mpg.
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harry from ct
Dodge Dakota
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7/14/2009
21:18:01
| RE: 15mpg?
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hook it up to a snapon scanner and find out if it has pending codes...an look to see if you have a lazy 02 sensor
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SHAD
Dodge Dakota
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7/15/2009
11:52:21
| RE: 15mpg?
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Message:
could be summer bled fuel vs winter blend, the summer fuel tends to fetch less mpg's
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