EGR delete reducing fuel economy?

[jcole3434]

Ok, my dads truck is a 05 lly, with an exhaust and cold air intake other than that completely stock. The egr started giving problems so we figured what the hell, eliminate it. We installed the sinister diesel delete kit with the intake tube, since installing economy has went from a steady 17.5-18 mpg (he does alot of freeway driving), to just under 14 mpg city highway doesnt matter. Everything i have read says egr delete will improve economy, has anybody else seen it decrease mpg so drastically?

 

[hondarider552]

Exhaust leaks? Boost leaks? Sinister kits are known to NOT be very good

 

[jcole3434]

whole system is sealed up that was the first thing we checked.. i mean just being a plate and a tube i dont see what could be bad about the system, just confused as to how the mpg would drop that far just from installing it.

 

[DIESELMAFIAPER.LB7]

Exhaust leaks? Boost leaks? Sinister kits are known to NOT be very good

I've installed them all believe me there are worse fitting pipes form big names in the duramax industry :thumb:

was it tuned correctly for the delete? I have seen them not make a difference but never a loss

 

[jcole3434]

no the truck hasnt been tuned at all.. just the cai and turbo back, now egr delete other than that it is untouched

 

[DIESELMAFIAPER.LB7]

It needs tuned :thumb:

 

[lts1ow]

Did not notice any difference on mine, PPE tuned and some block off plate.

 

[Dozerboy]

How would not having a tune effect the mileage?



Not saying its not the cause...A tune is a good idea regardless.


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[DIESELMAFIAPER.LB7]

Its going to code and affect the trucks performance