My 89 K3500 tbi 454 dumps fuel like its full throttle.
Very experienced mechanic has replaced the following:
tps, temp sensor, egr valve, fuel pump, plugs, wires, cap, rotor, O2, and module. He says all these tested bad. All this solved it for about 5 days. Then it came back worse than ever. He's still trying to figure it out.
A little history, never had problems like this before. I've been parking outside with hood up in all weather in Northern Colorado for 18 months. Hood is up because of rabbits and mice.
Before repairs the problem was somewhat noticeable and only happened at highway speeds, approx. 1700rpms. Then it seemed to travel into lower speeds. Symptom was slight miss, lack of response, and slight surging. All these things were increasing in noticability. Per mechanic, the problem was the system dumping way to much fuel. After repairs, it was good for about 5 days(150 miles)then one night at highway speeds it came back more pronounced. I reacted by letting up, it got even worse and essentially degraded too full throttle gas at idle. That's the last I drove it. I don't know what the mechanic is seeing now.
The question is with a good tps what would make the fuel system dump to way much fuel? What wires s/b inspected/tested?
When all this started, I got a 24 code - speed sensor.
Also, don't know if this matters, trans was replaced about 6 months ago.
Thanks.
Howard.
Very experienced mechanic has replaced the following:
tps, temp sensor, egr valve, fuel pump, plugs, wires, cap, rotor, O2, and module. He says all these tested bad. All this solved it for about 5 days. Then it came back worse than ever. He's still trying to figure it out.
A little history, never had problems like this before. I've been parking outside with hood up in all weather in Northern Colorado for 18 months. Hood is up because of rabbits and mice.
Before repairs the problem was somewhat noticeable and only happened at highway speeds, approx. 1700rpms. Then it seemed to travel into lower speeds. Symptom was slight miss, lack of response, and slight surging. All these things were increasing in noticability. Per mechanic, the problem was the system dumping way to much fuel. After repairs, it was good for about 5 days(150 miles)then one night at highway speeds it came back more pronounced. I reacted by letting up, it got even worse and essentially degraded too full throttle gas at idle. That's the last I drove it. I don't know what the mechanic is seeing now.
The question is with a good tps what would make the fuel system dump to way much fuel? What wires s/b inspected/tested?
When all this started, I got a 24 code - speed sensor.
Also, don't know if this matters, trans was replaced about 6 months ago.
Thanks.
Howard.