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Old 05-25-2012, 11:29 AM   #12
SkylineNXS
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Join Date: Oct 2006
Location: Elgin, IL
Posts: 658
Re: "resistance" while starting to move forward

Hi gents,

So I took it to a shop after doing a trans flush with no luck. After reviewing it, they claimed a bad fuel pump. However, after looking into it, it seems most bad pumps show themselves on start up in certain conditions. I have none of these issues, so I am a bit skeptical. I did change the fuel filter as that seemed like a good choice, since the engine would bog down at speed with load. However, this filter change did nothing.

I took it out after the change and once again experienced the issue. To try and rule out fuel pump, once the issue started to occur, I would shift to neutral and rev the engine up to 4-5k. This to me would mean the fuel pump is retaining pressure at speed and the engine is able to run at high rpm, however, this is unloaded.

I have a slightly better issue description. It will time to time happen at a stop light, but most often at higher speed. If i am on the highway cruising at 70, and try and push it higher, rpms will seem to "stick" at 3k or so and not accelerate the vehicle. Sometimes, after fluttering the gas a bit, I can get it to accel slightly, but other times, it will sort of "cut out" and no amount of fluttering will get any power back, and I will have to coast to the side of the highway and let it sit for a while, fluttering away at the pedal, until finally it will find some power and move.

It still seems to me like a trans issue as it will hard shift every once and a while and get up to the next gear, or down to the one i want, but it is certainly resilient to do so. However, the cut out issue also makes me suspect the fuel pump, or maybe the fuel sock is just jammed with debris. I am trying to find low cost solutions as I have little to money money for a major repair, but I am running out of ideas.

Other items, fuel pressure regulator is working fine, and I plan on getting a fuel rail pressure tester soon so I can rule out fuel pump if possible.

Any other ideas would be helpful, however I think I am running out of low cost solutions. Thanks guys...

Brad
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2000 GMC Sierra EXT Cab Short 4x4, finally mine...

1966 C10 SWB Fleet, 250 I6, three on the tree....

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1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4....

1972 Chevy LWB Fleet 350/350






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