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GMC 1500 Direct Fuel Management System
Posted on 10/8/26 at 9:12 am
Posted on 10/8/26 at 9:12 am
I read on Youtube that certain 5.3L engines in a GMC/Chevrolet 1500 pickup are susceptible to failure because of the Direct Fuel Management System. Anyone have experience with this?
Posted on 10/8/26 at 9:13 am to Chuck49
Yes, it's talked about weekly here
Posted on 10/8/26 at 10:24 am to Chuck49
Could totally see it.
Posted on 10/8/26 at 10:30 am to Chuck49
there is infinity information on this on the internet.
the answer is yes they are. you can buy a hundred dollar plug in device that will give you peace of mind but not actually do anything, or you can spend ten grand to fix the actual problem, or you can just buy the warranty and trade it in before it expires.
the answer is yes they are. you can buy a hundred dollar plug in device that will give you peace of mind but not actually do anything, or you can spend ten grand to fix the actual problem, or you can just buy the warranty and trade it in before it expires.
Posted on 10/8/26 at 10:49 am to Chuck49
quote:
I read on Youtube that certain 5.3L engines in a GMC/Chevrolet 1500 pickup are susceptible to failure because of the Direct Fuel Management System. Anyone have experience with this?
Yes. It sucks.
DFM differs from AFM because the same 4 cylinders would shut off in AFM and it caused lifter issues. DFM can shut down any cylinders down to I believe two cylinders. Driving in hills it is a pain in the arse because you will start going up an incline and have to really mash the skinny pedal to get all eight cylinders going to move the massive piece of shite vehicle.
Posted on 10/8/26 at 11:10 am to Chuck49
My 2018 5.3 has the AFM and approaching 140k miles with no issues. I had my mechanic quote the full delete and it was around $6-7k and I’ve heard the plug in device ($200) helps but doesn’t completely solve the issue since the lifters are still in there.
I’ve also read on GM forums that tightening the oil change intervals to 5k~ miles helps a lot since the lifters operate better with clean oil and that’s what I’ve been doing.
Really is a shame because the 5.3 pre 2007 didn’t have these systems and was a very reliable and durable engine capable of lasting for a long time.
I’ve also read on GM forums that tightening the oil change intervals to 5k~ miles helps a lot since the lifters operate better with clean oil and that’s what I’ve been doing.
Really is a shame because the 5.3 pre 2007 didn’t have these systems and was a very reliable and durable engine capable of lasting for a long time.
Posted on 10/8/26 at 12:14 pm to Sam Quint
You can get them fixed for under 2k at the right shops. Its just a lifter failure.
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