Fuel Injectors question??

[Honestmike]

I know this has been asked many times, but I cant seem to find any that are up to date and for an 03. My mileage has deteriorated in my dually. I bought it back in 09 and it got 19mpg hwy and 13-14 city. Now I am lucky to see 15 hwy and 10 city. I do have a lot of stiction issues and have put rev-x in it for past year. But it seems to not work as good as it used to. I see some smoke when I start it up and it also tends to lose power if I don't let it warm up to at least 120 deg. I have only ran synthetic oils in it and I have a edge cts to monitor vitals. FICM reads 47.8 - 48 at all times, fuel pressure 62 at idle, 56 WOT. I am ready to replace the injectors and was wondering whats the best for just overall MPG/ Economy. I am not looking to race this truck. It pulls my 20ft car hauler around the country. SO I wanna purchase EGR delete, oil cooler, injectors asap. I have the money sitting in the bank. Any advice be greatly appreciated. Thanks

[dowmace]

There is a thread floating around showing how to polish the spool valves on your injectors. That will alleviate your stiction problems.

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[Honestmike]

Could that be linked to the cause of my MPG loss? Thanks

[dowmace]

I'm sure it could. After doing it on my injectors I gained about 1.5mpg back. My stiction wasn't terrible though.

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[twoicebergs]

Unless you are having stiction issues, it may be something else, such as EGR or EBP sensor issues, boost or dirty turbo, or even low compression related items. It could also be injector nozzle related.

So if you have narrowed it down to injectors, then you have nothing to loose by trying this procedure. However, rather than pull them all, it would be better to know which cylinders are under contributing and perhaps do one bank at a time.

You do not have to remove the spool-valve housing from the injector. You need a T-10 and a 4mm socket to remove bolt holding the the coils. It may need way more force than you would expect for such a small nut. Do not install it as tight as it was on removal. If it moves easily in the housing, there is no need to pull it out, but there is no harm in having a look at it.

Here are the links:

Fixing stiction

SPOOL VALVE STICTION POLISHING

[Honestmike]

thanks for all the great info. I am going to order a auto Enginuity scanner and verify which injectors are acting up. I for sure am going to try the spool valve trick.