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Lack Of Power.....still

GMhunter93

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GMhunter93 Enthusiast

GMhunter93

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I posted a while back about my 350 V8 seemingly getting starved for power. Since then i've replaced the plugs and wires (made a huge difference) It runs ALOT smoother and doesnt sputter as much anymore. But it still seems to lack the get up and go it should have. I can stand on the Brake and give it gas to the floor and it will only get up to about 1500RPM's and it can't pull throught the brake to save its life. Also you guys told me to put seafoam through it, I did that in the gas tank and in the intake, planning on doing ti in the oil when it gets close to changing time. Would it possibly have some kind of restrictor on it that wont let it get higher RPM's with the brake down? If you guys could shed some light on this I would appreciate it, thanks.

fbachman Senior Enthusiast

fbachman

Posted
Posted
I posted a while back about my 350 V8 seemingly getting starved for power. Since then i've replaced the plugs and wires (made a huge difference) It runs ALOT smoother and doesnt sputter as much anymore. But it still seems to lack the get up and go it should have. I can stand on the Brake and give it gas to the floor and it will only get up to about 1500RPM's and it can't pull throught the brake to save its life. Also you guys told me to put seafoam through it, I did that in the gas tank and in the intake, planning on doing ti in the oil when it gets close to changing time. Would it possibly have some kind of restrictor on it that wont let it get higher RPM's with the brake down? If you guys could shed some light on this I would appreciate it, thanks.

 

Can't comment on older model years, but I DO know that the newer ECMs have what's called a Torque Braking setting, which, when engaged (default), the engine will not exceed a nominal RPM if the brake pedal is displaced. That is part of the abuse prevention built in to the modern pooters.

 

Again, not sure what was going on in the mid-90s in terms if that, but on the newer trucks, that is by design. A custom tune can turn that off.

 

(Looking at your sig stuff and user stuff I think you are talking about a 95 model) Not sure what was in and out during that vintage.

Wires Enthusiast

Wires

Posted
Posted
I posted a while back about my 350 V8 seemingly getting starved for power. Since then i've replaced the plugs and wires (made a huge difference) It runs ALOT smoother and doesnt sputter as much anymore. But it still seems to lack the get up and go it should have. I can stand on the Brake and give it gas to the floor and it will only get up to about 1500RPM's and it can't pull throught the brake to save its life. Also you guys told me to put seafoam through it, I did that in the gas tank and in the intake, planning on doing ti in the oil when it gets close to changing time. Would it possibly have some kind of restrictor on it that wont let it get higher RPM's with the brake down? If you guys could shed some light on this I would appreciate it, thanks.

 

I thought all vehicles had to prevent movement when the brake is fully depressed to prevent situations should the gas pedal sticks.

 

Are you talking riding the brake or full pedal to the floor brake? Every vehicle I've owned will only toss the revs up until the converter stalls and then holds there.

Badass69 Senior Enthusiast

Badass69

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The old TBI trucks have none of the restriction upon restriction in the ECM's like the LS series engine equipped trucks do. Basically beyond a lazy fuel and timing curve, they do whatever 200 Hp and 300 lb ft can just like a carbed engine would.

 

Have you checked the timing on this truck? Fuel pressure? What about a compression test too while you are at it. Lack of engine power is usually fuel or timing related.

 

Has the truck ever pulled hard or has it been this way since you got a hold of it? Some of them unfortunately are just dogs.

desrtrat Senior Enthusiast

desrtrat

Posted
Posted

it's your torque converter. stalls at 1500 rpm, and your not putting out enough power to over ride the breaks. if it is so inportent to brake your wheels louse, than put a 3000 stall converter in. that should do it.. :D

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
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did you replace the fuel filter? A plugged exhaust will also act like that, it will drive fairly normal with normal throttle pressure, but die on heavy throttle/load.

GMhunter93 Enthusiast

GMhunter93

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Thanks guys, I will definitly investigate your input. My brother actually has a fuel filter for my truck I just havent gotten from him. But I do plan on getting it soon.

Nytemare Senior Enthusiast

Nytemare

Posted
Posted
Thanks guys, I will definitly investigate your input. My brother actually has a fuel filter for my truck I just havent gotten from him. But I do plan on getting it soon.

Have you tried to do the same "brake stand" in 1 and not D??

Try that and report back.

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