Recent content by Philip Parker

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    Hunting down a weird idle

    Hey all. The current tune in my engine runs 25° advanced at idle. This seems excessive and I think it’s causing a very rough idle. Does this seem correct for an L 29?
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    1999 K2500 continuously gets 5mpg

    There is a faint smell of fuel actually. I will check it out, thank you.
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    1999 K2500 continuously gets 5mpg

    stock.
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    1999 K2500 continuously gets 5mpg

    I should add as well: I installed a new OEM fuel rail when I did the top end and the injectors were multi hole instead of the single hole version.
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    1999 K2500 continuously gets 5mpg

    No worries, certainly need to verify! I am calculating from odometer and gallons added. The city has a speed radar display on my street and it matches to within 1mph to the needle on the dash.
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    1999 K2500 continuously gets 5mpg

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    1999 K2500 continuously gets 5mpg

    Yes rich. What you've stated is also my understanding about the ECU's ability, and why the tuner said it isn't really anything to worry about. He's convinced that the ECU (black box) is getting bunk information form something but I have literally swapped every sensor on the engine to no avail...
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    1999 K2500 continuously gets 5mpg

    Troy Brown at Howell tuned it.
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    1999 K2500 continuously gets 5mpg

    I run HP tuners and have done about half a dozen scans. The long term fuel trim show fat around 7% and the guy who tuned it said that’s nothing that will be causing such poor mileage. I have not figured out how to see torque converter clutch activity within HP tuners but I will look again...
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    1999 K2500 continuously gets 5mpg

    Before doing the engine stuff the truck is probably getting around eight average. Before I did the motor I redid all the suspension components including bearings on all four corners. Like literally tore the entire front end out and rebuilt it. The rear brakes are disconversions and I have...
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    1999 K2500 continuously gets 5mpg

    This is on my short list, however my long-term fuel trims are showing fat for some reason.
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    1999 K2500 continuously gets 5mpg

    I blocked out the EGR because it was stuck open causing bad map readings so the ECU is pulling timing like crazy. Tires are pumped up, I don’t expect amazing mileage but I do expect better than five.
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    1999 K2500 continuously gets 5mpg

    Hey all - I have a k2500 ccsb with a modded 7.4. Stock bottom end with Brodix short runner heads and all the valve train goodies. 510 cam both sides with a nice lsa for efi. The truck never gets better than 5mpgs (empty or towing). I have done it all: maf, o2s, new ECU, three new tunes, blocked...
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    L29 Build update - gremlins persist

    Actually I am getting conflicting information on this from a couple tuners. There will never be positive intake manifold pressure unless the engine has forced induction, the highest it will ever achieve is the same as the static barometric pressure of the elevation you're at. So an increase in...
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    Rear Catalytic Converter Direct Fit Options - 1999 7.4 CCSB

    I am learning that this is a way to avoid the generation break year, thanks for the tip. Apparently chevy sold GMT400 and 800s simultaneously for a couple years.
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