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Showing results for tags 'dfm'.
Found 9 results
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I have a 2020 gmc sierra sle 5.3, I bought it may 13th. Starting at about 800 miles check engine light would flash for a minute or two and then go off, this occured every 300 miles until I got in one day around 1500 or 1600. Check engine light stayed on. Called the dealership and took it in was throwing misfire codes, the diagnosed it as fuel pump module reset the codes and ordered the part and sent me on my way. Come back in and had it replaced when the part arrived, well now fast forward to a tank and a half later and now the check engine light is on for the evap system/gas cap, and fuel pressure at 2200 miles. Right at a week from the time it come out of the shop. I've been extremely happy with the truck but I can't believe I'm going to have to find time to get it in the shop to be looked at and fixed again. I'm at wits end already. Anyone else having these issues? -
Hello to all, new to forum and have a few questions. Purchased a used 2019 RST with the 5.3. Not new to AFM but first truck with DFM and Auto Start/Stop. I installed a Pulsar LT unit, programmed per instructions/videos. Maybe it's me but it seems the DFM delete function isn't working as it should but the Auto Stop/Start functions works fine. It seems that there is still a bit of hesitation and shuddering when accelerating. Any thoughts or should I be considering other issues. Thx -
Around 15K I had the transmission issue with it slipping and the dealership replaced the fluid with the mobile 1 which seem to resolve it enough that i could live with. The transmissions still clunks into first when down shifting but whatever. Well now at 30K I have something similar going on, but seems just slightly different. When I'm cruising around 35-40 it almost feels like the truck is braking or downshifting and then speeding up, but enough everyone in the truck can feel it. At first i was thinking it was the DFM kicking in and its opening and closing valves so i bought a pulsar box ( i needed it for tires and autostop/start as well) and disabled the dfm, but it still does this weird shimmy. I know that doesnt necessarily still mean its not dfm but... still. This may sound crazy, but its much worse when its really hot outside and the truck has been sitting for bit. This morning it was cloudy and about 80 degrees. Didn't notice it too bad when i left, but this afternoon it was about 95 (truck had been sitting in the sun for several hours) and when i went to leave even the passenger was thinking i was about to run out of gas once we leveled out around 40. After stopping and going a few times it settles down enough that its back to just being very subtle, but still noticeable. Is anyone else experiencing something similar? Is it DFM, Torque converter, transmission or just something i will have to trade out to resolve. I appreciate any answers that are offered up because i really, really don't want to get rid of this truck. -
Looking at crew cab short bed 4x4’s with the V8’s. I just can’t wrap my head around not having low range so it’ll either be a Z71 or a Trail Boss. Been watching prices and I’m seeing Custom Trail Boss trucks starting to get close to the prices of the LT. As in within a grand or even less. Anyone bought a Custom and regret it? I have a 2011 Silverado 1500 4x4 and my wife has a 2017 Yukon 4x4. Both have the 6L80 transmission and hers has the Ecotec 5.3 V8. Very happy with that engine and transmission combo and even with less power my ‘11 moves and drives well with the 3.42 gears. Will I miss anything with a Custom instead of a regular LT Z71? 6 spd vs 8 spd? Gas mileage? Something else? -
Has anyone heard any news on the dfm for the 6.2 with the 10 spd transmission? I'm having a horrible time with mine.
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Chevy passed out a 2019 Silverado information book to journalists during this week's media drive. I'm working on scanning the entire thing and sharing it here. There's a lot of information packed into this flip book. I thought the most interesting was the engine line up and an AFM vs DFM diagram. This is the best comparison blowout diagram I've seen so far. Here's the four pages related to the engines.
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Zane Merva Executive Editor, GM-Trucks.com 6/29/2018 Even with an all new dynamic fuel management system, the 2019 Silverado equipped with a 5.3L or 6.2L engine won't see any better fuel economy then their 2018 predecessor. Today Chevrolet released more information on what the 2019 Silverado will cost and what fuel economy we'll see. Here's the new chart.. 2019 CHEVROLET SILVERADO CAPABILITIES 4.3L V-6 w/AFM (6-spd.) 5.3L V-8 w/AFM (6-spd.) 2.7L I-4 Turbo w/AFM (8-spd.) 5.3L V-8 w/DFM (8-spd.) 6.2L V-8 w/DFM (10-spd.) 3.0L I-6 Turbo-Diesel (10-spd.) Horsepower 285 355 310 355 420 TBA Torque 305 383 348 383 460 TBA Max towing 8,000 11,000 7,200 11,600 12,200 TBA Max payload 2,500 2,430 2,280 2,190 2,100 TBA EPA-estimates (city/hwy/comb) N/A N/A N/A 17/23/19 16/20/17 N/A From these official figures, a 2019 Silverado with the 5.3L is rated 17 MPG City , 23 MPG Highway and 19 MPG Combined. The 2019 6.2L is rated at 16 MPG City, 20 MPG Highway, and 17 MPG Combined. Chevy does not specificy if these numbers are for 2 or 4 wheel drive, so we can only guess. If it's 2WD, then the 5.3L gains 1MPG in the City but stays flat in the Highway and Combined ratings compared to 2018 figures. The 6.2L also gains 1MPG in the city but loses 1MPG in the Highway rating. The Combined rating stays flat. So, where is the big benefit to DFM? Is GM's new fancy technology going to wow in real world driving or just with fancy words? We'll find out soon when we take delivery of our 2019 Long Term Silverado LTZ in a few weeks. See Also:
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Is there a drive mode where AFM is shut off?
