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Hey Ranger Station,
I put a can of seafoam through the fuel tank and my mpg went down from 25 to 19 highway miles and stayed there for 3 tanks. Did some research and decided to replace pcv valve, fuel filter, plugs, and both o2 sensors. (wires were on back order). I disconnected negative battery terminal to reset the computer. After this the truck ran alot better for around a tank and a half and mpg went up to 22. Then the wires came in and I installed them as well as cleaning the mass airflow sensor, cleaning the throttle body, and replacing the air filter. Truck ran good for 100 miles and then started missing very badly to the point that it would only drive at above 3000 rpms. Hooked up odbii and had codes for cylinder misfires (3 codes: 1 for cylinder 2, 1 for 3, and 1 for multiple) as well as a code for bank 1 sensor 1 (o2 sensor) sending lean signal. I realized that I had hooked the wires from the coil to the plugs up in the incorrect order. I fixed that and still bad misfires. I tried taking the new plugs out and checked them for damage, cleaned them (some carbon on them) and checked the gaps. Reinstalled them and still missing badly. Took the new wires off and tried the old wires. Still misfires. Tried switching out the coil pack. No luck. Tried taking out the new plugs and putting the old plugs back in. Still misfiring. Could a lemon o2 sensor be causing such severe misfires? Could it be the pcv valve? Or the fuel filter. Thought it was less likely the fuel filter or pcv valve since i got no codes for them. I need some expert help here. Seems I have done all I can. Thanks for your time, Mike.
I put a can of seafoam through the fuel tank and my mpg went down from 25 to 19 highway miles and stayed there for 3 tanks. Did some research and decided to replace pcv valve, fuel filter, plugs, and both o2 sensors. (wires were on back order). I disconnected negative battery terminal to reset the computer. After this the truck ran alot better for around a tank and a half and mpg went up to 22. Then the wires came in and I installed them as well as cleaning the mass airflow sensor, cleaning the throttle body, and replacing the air filter. Truck ran good for 100 miles and then started missing very badly to the point that it would only drive at above 3000 rpms. Hooked up odbii and had codes for cylinder misfires (3 codes: 1 for cylinder 2, 1 for 3, and 1 for multiple) as well as a code for bank 1 sensor 1 (o2 sensor) sending lean signal. I realized that I had hooked the wires from the coil to the plugs up in the incorrect order. I fixed that and still bad misfires. I tried taking the new plugs out and checked them for damage, cleaned them (some carbon on them) and checked the gaps. Reinstalled them and still missing badly. Took the new wires off and tried the old wires. Still misfires. Tried switching out the coil pack. No luck. Tried taking out the new plugs and putting the old plugs back in. Still misfiring. Could a lemon o2 sensor be causing such severe misfires? Could it be the pcv valve? Or the fuel filter. Thought it was less likely the fuel filter or pcv valve since i got no codes for them. I need some expert help here. Seems I have done all I can. Thanks for your time, Mike.
