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Fuel injector service and tuning...

This is a discussion on Fuel injector service and tuning... within the General Help forums, part of the LSx Technical Help Section category; I've got a 98 WS-6, bought it new, and outside of using some Redline injector cleaner, haven't gone to a ...

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    Fuel injector service and tuning...

    I've got a 98 WS-6, bought it new, and outside of using some Redline injector cleaner, haven't gone to a service shop or dealer to have my injectors/ports serviced and cleaned. Is this a critical maintenance item?

    Also, and I was going to post this in the tuning section, but without going into the whole long story of why my car was there in the first place... I ended up with my car at a Chevy dealership after a fuel pump failed on me. When I picked the car up they said they had "updated my computer."

    I noticed that the car seemed to have a little more pep, but I also noticed that my fuel economy went out the window. Whereas I used to get about 25-28 MPG on the highway, I'm now down to 20 MPG. I've had the car smogged since and it again passed with flying colors so I have no concerns there, but I want my fuel economy back!

    Any ideas on why this is happening and/or how I can get it "fixed?"

    Thanks

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    Just a slow Camaro KING Z28 HAWK's Avatar
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    Give them a call and ask them what all did they do

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    Quote Originally Posted by KING Z28 HAWK View Post
    Give them a call and ask them what all did they do
    Unfortunately I didn't realize the gas mileage thing until some time later. This is a dealership I would not return to and I'm doubting they would remember or have the details of what they did, at least my receipt wasn't very specific.

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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by KING Z28 HAWK View Post
    Give them a call and ask them what all did they do
    they flashed his PCM with the latest OS and cal data available for his year/VIN via their TechII I'd imagine.

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    Quote Originally Posted by Frost View Post
    they flashed his PCM with the latest OS and cal data available for his year/VIN via their TechII I'd imagine.
    That's what I figure they did too, I'm just surprised that my mileage went down so much.

    How could/would I go about finding somewhere to flash it back to the stock code?

    Also, any input on the injector maintenance question?

    Thanks

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    TunedbyFrost.com Tuner Frost's Avatar
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    O2s are running the show for closed loop fueling, so they are suspect as soon as mileage is mentioned.

    Is there some issue that you are having (mileage not withstanding) that makes you concerned about your injectors?

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    Quote Originally Posted by Frost View Post
    O2s are running the show for closed loop fueling, so they are suspect as soon as mileage is mentioned.

    Is there some issue that you are having (mileage not withstanding) that makes you concerned about your injectors?
    Nope, there are no concerns other than the mileage, but I'm really not looking at the injectors for the major part of the mileage problem because I believe this change occured after the computer code update.

    The car is performing well other than the mileage.

    There is one other oddity that now occurs since the fuel pump was replaced. My fuel gage does not appear to be completely accurate any longer. It shows slightly above full when I fill the tank but it *quickly* drops about 1/8'th below full within about 5-10 miles. When on empty I can generally only get about 13-13.5 gallons before the tank is full so I suspect the reading is lower than the actual fuel available.

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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by Bob Savage View Post
    Nope, there are no concerns other than the mileage, but I'm really not looking at the injectors for the major part of the mileage problem because I believe this change occured after the computer code update.

    The car is performing well other than the mileage.

    There is one other oddity that now occurs since the fuel pump was replaced. My fuel gage does not appear to be completely accurate any longer. It shows slightly above full when I fill the tank but it *quickly* drops about 1/8'th below full within about 5-10 miles. When on empty I can generally only get about 13-13.5 gallons before the tank is full so I suspect the reading is lower than the actual fuel available.


    they could have bent the float for the sender's wire; it's easy to do. there is little in a cal update that should affect mileage; it'd have to be a switchpoint change and that is highly unlikely.

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    Quote Originally Posted by Frost View Post
    they could have bent the float for the sender's wire; it's easy to do. there is little in a cal update that should affect mileage; it'd have to be a switchpoint change and that is highly unlikely.
    Well that stinks... where would you suggest I start in my quest to get my 7 MPG back?

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    Junior Member lloydb3's Avatar
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    Do not do the injector cleaning/fuel injection service at a dealership. When I was wrenching we used to call it the "Wallet Flush"! You can get the same stuff at your local parts store and do it yourself.

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    Quote Originally Posted by lloydb3 View Post
    Do not do the injector cleaning/fuel injection service at a dealership. When I was wrenching we used to call it the "Wallet Flush"! You can get the same stuff at your local parts store and do it yourself.
    That's the info I'm looking for. So the Redline stuff is good enough?

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    Junior Member lloydb3's Avatar
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    It works just as well as the BG stuff
    Lloyd - 2002 Pewter Z-28, T-Tops, Hurst Shifter, Corsa Exhaust, MAF Upgrade, Diablo Sport Tune, Centerforce HD Clutch, SLP lightened flywheel, SLP cold air kit w/ bellows, K&N Filter, Coming soon Ported and Polished heads.

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