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Old 06-29-2011, 09:09 PM
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[B][/B]10 MPG NEED HELP

I have an early 99 7.3 i have gotton 10-11 mpg the last 10- or more fill ups

i have some DTC's

P0238- turbo/super charger boost A (tc/sbc-a) ckt

P1249- Wastegate control valve performance

P0603- Internal control module keep alive memory (kam) error

P0478- Exhaust pressure (ep) control valve high

P0470- Exhaust pressure A ckt

P1211- Injector control pressure higher/lower then desired (engine running)

MODS

AFE STage 2

i think its a 3.5 Down pipe to 4"

sct DP tuned it seems like any tuner i use bad mpg i had hyper tech, and sct tunes,

when i first got it i was getting 18 with a ATS CHIP on the back of the computer , it went down slowly every time i filled up

and i have some 33" mud grapplers with 20s 2" lift

4 door short bed...

Last edited by 7.3 "Smokey"; 06-30-2011 at 03:31 PM. Reason: no one helped lol
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Old 06-30-2011, 03:29 PM
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Can anybody help? i have a lot of info up, and i got a new fuel filter today, didnt think that the old one was that bad but it may be...
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Old 07-01-2011, 10:23 AM
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mpg drop

I feel your pain as i have been fighting a MPG drop in my truck. One thing i found on mine was leaky intercooler boots. They were very dirty. Now i have not had a chance to reallly test mine yet to see if it helps. But i was told that is something to check.
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Old 07-01-2011, 10:50 AM
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Probably a boost leak. Check every connection you can and all those vacuum lines by the turbo too.
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Old 07-01-2011, 09:57 PM
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I have seen down under the y pipe there is alot of oil, looks like the boots on the intake runners have oil on them so do u think they are leaking?
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Old 07-01-2011, 10:33 PM
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boots

Im not an expert just learning. But if you mean the orange boots under the spider like manifold that connects to the turbo yes. And there are 4 boots that hook the intercooler pipes together. They were leaking and very dirty on my truck. Joe
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Old 07-02-2011, 08:28 AM
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yea, when i do this i was wanting to chang the x pipe to a afe blade runner, and change the intake runners...
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Old 07-03-2011, 11:20 AM
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Question Best intercooler for 99 7.3?

I want to know witch won to buy I'm ready to buy, any help would be awesome thank you, and I'm thinking of doing the beans intake runners, and afe blade runner, any info on those would be awesome like I said, thank you for your time and thought
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Old 07-03-2011, 06:01 PM
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leaky boots

Well just to follow up, by changing the fuel filter and haveing the intercooler boots cleaned and tightened up helped. It appears that my good mpg is back to normal. Only had about a 175 mile trip to test it but came back with an excellent mpg just over 20! Joe
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Old 07-03-2011, 11:07 PM
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Quote:
Originally Posted by renoduckman View Post
Well just to follow up, by changing the fuel filter and haveing the intercooler boots cleaned and tightened up helped. It appears that my good mpg is back to normal. Only had about a 175 mile trip to test it but came back with an excellent mpg just over 20! Joe
What was you getting before? and what did you do to fix it?

Thanks

Andrew
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