1999 Tahoe acceleration problem
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Joined: Jun 2013
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1999 Tahoe acceleration problem
I have a 99 Tahoe 4x4 5.7 180K
This has been a great vehicle up until the last few months, problems are starting to creep up. Expected for 180K and up until now I have been able to diagnose and fix everything that has come up.
Whe I try to accelerate from a stop or a rolling stop the truck will flat out not accelerate for about a block then it opens up. I can push it too the floor and the rpm climbs very slowly then she takes off. It usually happens when I have just started her and pull out of my drive way but also after driving for 50miles or so when I go to pass on the highway she wont accelerate.
I am thinking maybe a back pressure problem or fuel problem. Plugs, wires, cap and rotor are all new. Fresh oil. Fuel pump was replaced about 6K ago.
The only code is a downstream O2 sensor that has been on since before the problem started.
Any ideas the problem is?
This has been a great vehicle up until the last few months, problems are starting to creep up. Expected for 180K and up until now I have been able to diagnose and fix everything that has come up.
Whe I try to accelerate from a stop or a rolling stop the truck will flat out not accelerate for about a block then it opens up. I can push it too the floor and the rpm climbs very slowly then she takes off. It usually happens when I have just started her and pull out of my drive way but also after driving for 50miles or so when I go to pass on the highway she wont accelerate.
I am thinking maybe a back pressure problem or fuel problem. Plugs, wires, cap and rotor are all new. Fresh oil. Fuel pump was replaced about 6K ago.
The only code is a downstream O2 sensor that has been on since before the problem started.
Any ideas the problem is?
CF Beginner
Joined: Jan 2025
Posts: 1
Likes: 0
My problem was the throttle control sensor
[QUOTE=jakeatkins;250978]I have a 99 Tahoe 4x4 5.7 180K
This has been a great vehicle up until the last few months, problems are starting to creep up. Expected for 180K and up until now I have been able to diagnose and fix everything that has come up.
Whe I try to accelerate from a stop or a rolling stop the truck will flat out not accelerate for about a block then it opens up. I can push it too the floor and the rpm climbs very slowly then she takes off. It usually happens when I have just started her and pull out of my drive way but also after driving for 50miles or so when I go to pass on the highway she wont accelerate.
I am thinking maybe a back pressure problem or fuel problem. Plugs, wires, cap and rotor are all new. Fresh oil. Fuel pump was replaced about 6K ago.
The only code is a downstream O2 sensor that has been on since before the problem started.
Any ideas the problem is?[/QUOTEmy
This has been a great vehicle up until the last few months, problems are starting to creep up. Expected for 180K and up until now I have been able to diagnose and fix everything that has come up.
Whe I try to accelerate from a stop or a rolling stop the truck will flat out not accelerate for about a block then it opens up. I can push it too the floor and the rpm climbs very slowly then she takes off. It usually happens when I have just started her and pull out of my drive way but also after driving for 50miles or so when I go to pass on the highway she wont accelerate.
I am thinking maybe a back pressure problem or fuel problem. Plugs, wires, cap and rotor are all new. Fresh oil. Fuel pump was replaced about 6K ago.
The only code is a downstream O2 sensor that has been on since before the problem started.
Any ideas the problem is?[/QUOTEmy
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