Isx 15 mpg dropped 1.5 mpg
02-05-2019, (Subject: Isx 15 mpg dropped 1.5 mpg ) 
Post: #1
Isx 15 mpg dropped 1.5 mpg
Hey guys , my single cam 2013 isx dropped 1.5 mpg over night , demandated a year ago, and no real running issues to speak of , just lost mpg, was showing a low rail pressure code and replaced fuel filters to fix that , so no more codes , new cam and rockers 200,000 ago , and no real black smoke i can see , but she is a grass burner , and i see no external leaks , any ideas ? Its hard to trust anyone out here , and im way too far from jerry to get to him for a few weeks ,
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02-05-2019, (Subject: Isx 15 mpg dropped 1.5 mpg ) 
Post: #2
RE: Isx 15 mpg dropped 1.5 mpg
I am a little redundant on this ......has your fuel pump been updated/checked?
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 Thanks given by: smorgan87 , Waterloo
02-05-2019, (Subject: Isx 15 mpg dropped 1.5 mpg ) 
Post: #3
RE: Isx 15 mpg dropped 1.5 mpg
Could be a boost leak.
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02-05-2019, (Subject: Isx 15 mpg dropped 1.5 mpg ) 
Post: #4
RE: Isx 15 mpg dropped 1.5 mpg
make sure your doser injector is not leaking fuel. Just because you may not have it active, does not mean it can't get leaky and lower fuel mileage.


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