why do i lose power on hills

90

Asked by Oct 17, 2013 at 08:11 PM about the 2000 GMC Sierra 1500 SLE Standard Cab LB

Question type: Maintenance & Repair

I lose power on hills change the fuel pump and checked timing changed catalytic converters  almost like a restriction but nothing shows on the computer

12 Answers

could be any number of concerns...fuel pressure regulator...malfunctioning EGR...bad IAT (intake air temp) and Block temperature senders~ if well over 80,000 miles would argue that the egr valve is sufficiently clobbered with carbon and a bath in paint thinner or brake cleaner will make it operate properly~

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Best Answer

connect a fifteen dollar OBD-II reader and read/reset your trouble codes~....NO codes will appear for a bad fuel pressure regulator~

1 out of 1 people think this is helpful.
90

tried all that the computer says everything is working fine, new fuel pump the air is flowing good changed catalytic converters if you push slow on fuel peddle it goes to top RPM.S kick it fast it starts bogging down and loses power

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90

it will not show any codes

1 out of 1 people think this is helpful.

nope...but if not functioning properly will not idle or accelerate properly now I'm thinkin' TPS~ those are about fifty bucks~

you know the purpose of the EGR is to introduce exhaust gas back in on deceleration and also when combustion temperatures get TOO hot, kicks in to put a little cat food in the chili (so to speak)~ ...so yours may very well be clobbered with exhaust carbon or the diaphragm is inoperative~

1 out of 1 people think this is helpful.

The TPS will make the ECU "go nuts" as it says...I'm here..NO I'm to the floor NO I'm mid positon....no I'm here to confuse the air/fuel mix..so yes they wear out...tho entirely optical DO get fouled up with use...it's a relatively cheap thingamabob so once it has been replaced...we can omit it from the spectrum of troubled areas~

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35

Mine has been having the same problems, but is actually throwing codes. P0171, P0174, P033, P1133. Replaced 02 sensors, Checked MAF (good), replaced air filter, replacing spark plugs and wires. Any ideas?

3 out of 3 people think this is helpful.
90

I tried everything so now putting a new computer in it I hope this works Sorry you are having the same problem

2 out of 2 people think this is helpful.

....everything...we haven't tried the MOST basic...that is the 1/0 CABLE that connects the battery to the chassis ground...gets smoked with deposits from the mating surface....then becomes unreliable issuing varying voltages and available amperages~....so get a NEW battery and assure the ground connection is SHINY and able to pull 300 cold cranking amps with no care~

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90

2000 gmc sierra 4.3 shows lean feul but can not find how or where to look

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90

my 2000 sierra starts good and ideals good the only thing that shows up on the scanner is the fuel is lean everything else shows good pls help

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