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Motor dies when letting off throttle

fhu667

Member
39
3
8
Location
Dallas
Hi guys. I've had this problem going on for a while now. I hope someone can point me in the right direction. One day my truck started dying when I would let off the throttle. It ran fine going down the road, and then it got to where it wouldn't idle. I changed the fuel and filters, and there was heaps of sludge in the filters. After that my truck ran better, and it continued to improve. Now it doesn't seem to be getting any better. It runs great going down the road, but when shifting gears or any other time I let off the throttle it wants to die. If I nudge the accelerator a bit it will idle smoothly, and it will continue to idle smoothly until I gun the accelerator. When I let off the throttle it goes to about 400 RPM, and it tries unsuccessfully to accelerate or adjust the throttle. It just seems like it can't adjust fast enough.

I read a bunch of articles, and I have watched some videos. I opened a plate around the injector pump too see if an arm was in the 7 o'clock position, and it was very close. I also sprayed all with carb cleaner hoping it was gummed up, but that didn't make any difference.

I wonder if it could be restricted in the fuel pickup inside the tank, but that's going too be a really difficult area to get to in my truck. I'm just going someone can give me some clues as to what to look for. It just seems odd that the truck runs so good at speed, and that makes me think it's not a fuel delivery problem. Honestly though, I just don't know much about fuel injection.

Thanks in advance.

Sent from my SM-N975U using Tapatalk
 

davidb56

Well-known member
1,020
1,237
113
Location
Bonners Ferry Idaho
Seems the very opposite of a clogged system. It should Idle ok and run out of fuel at higher rpm's. My guess is that you need to adjust the throttle. The dirty fuel system is a separate issue.
 

V8srfun

Well-known member
423
538
93
Location
Altoona pa
I would change the filters again and start running fungicide in your fuel. Like mentioned above it would be wise to clean the screen on the in tank unit.
 
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