2002 5.3 Tahoe 102mm Intake, 226IN/238EX Cam, Long Tube, Decapped Inj. New need help!
Need help, not to far from stock but still so far. Truck runs an drives like complete trash. It will hardly start, very rough idle, almost dies when i come to a stop, bad exhaust fumes. Im trying to save it but i cant seem to get it there. Ive attached a log an tune to go with this so HELP PLEASE!!!
2002 L59 1st ECM2.hpt
Better , worse, same
You would be much better off getting a good set of injectors.
Are you at a high elevation (5000 ft?) if not looks like you might have a map sensor issue too.
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im about to write it. be with you shortly. thankyou
Alvin I have another set i believe the Flex Fuel 33.05/flow. As for the map sensor, when i did the 102mm intake the map sensor is at the back of the intake not the top well i ran the stock map for a while, it did good it just didnt fit accordingly so the one the summit recommends was a 2.5 bar but im not boosted. so i got a sensor that looks identical to the recommended one its just a stock sensor from autozone. it fits good.
Elevation 470 ft.
What is the MAP part number currently installed. "Fits" and "looks identical" doesn't help much.
Have you changed the MAP sensor settings in the tune as you changed these back and forth?
Its likely going to be the 128kpa x -0.31 one
Need part number to know for sure.
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map sensor ACDelco-55573248
yeah your map sensor stuff should read 128kpa x -0.31Originally Posted by Collin Smith
Where it reads 94.43 x 10.34
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Can I leave the sensor in just change the number on editor? Or do i have to get another sensor?
Change it in the tune to 128kpa linear and -.031offset.
I can defenitely tell a difference. its bogging down or sputtering at like half throttle. Also when im starting the engine it back fires or barley fires up. takes about 10 - 20 sec to catch up.
Im personally not a fan of "decapped" injectors but did you have them flow tested to ensure they are all flowing the same or did you buy off the market?
With your current mods i dont see why you would want "Decapped" injectors.
Do you have part number of the injectors by chance?
Last edited by tana99ss; 06-01-2023 at 12:41 AM.
I do not. I do know that they are Flex Fuel injectors Denso 33.05 flow rate. I do have another set 253417628 these came out of a 2004 Chevrolet Tahoe Z71.
change the injectors out to stock injectors if you have them, update the data and see where you stand.
Quick search for 253417628 doesn't really show much info, and I don't see anything that I would trust to pull injector data from.
Adjust your ve or maf for fuel trims and it should clean up. Also your wot fueling is not kicking in so I would get that straight before continuing to test WOT. I suspect you also either have exhaust leak issues or your wideband is faulty.
Adjust My VE or MAF for fuel trims? What does that mean?
WOT fueling is not kicking in? Would that be from the injectors?
he is talking about adjust your VE table and or MAF table.
Let me start by asking
is everything on this vehicle like maf o2s intake and does it have full exhaust?
as reubone mentions, the wideband is all over the place so it can possibly be because of a bad sensor or exhaust leak or just bad information from injectors.
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