ScoobyJD
Newbie
- Joined
- Feb 19, 2013
- Messages
- 20
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22Throttle position (TP) sensor – voltage low
44Oxygen sensor (O2S)/heated oxygen sensor (HO2S) – mixture lean
54Fuel pump circuit – voltage low
1994 GMC Sierra SLE K1500 5.7
What could the causes of these codes be? The codes are active after about 5-7 seconds after start up. The truck jumps to 1500 rpm and after about a minute drops to between 1000 rpm to 700rpm. I have also noticed that going into second (auto) the truck shifts pretty hard but goes away after it gets up to temp.
I just recently replace the TPS, IACV, completely new fuel system from tank to front lines (yes I remembered to bolt both ground straps), rebuilt tbi, new oxygen sensor, distributor, plugs, wires, both coolant temp sensors, water pump, thermostat, coolant flush, power steering pump, alternator.
44Oxygen sensor (O2S)/heated oxygen sensor (HO2S) – mixture lean
54Fuel pump circuit – voltage low
1994 GMC Sierra SLE K1500 5.7
What could the causes of these codes be? The codes are active after about 5-7 seconds after start up. The truck jumps to 1500 rpm and after about a minute drops to between 1000 rpm to 700rpm. I have also noticed that going into second (auto) the truck shifts pretty hard but goes away after it gets up to temp.
I just recently replace the TPS, IACV, completely new fuel system from tank to front lines (yes I remembered to bolt both ground straps), rebuilt tbi, new oxygen sensor, distributor, plugs, wires, both coolant temp sensors, water pump, thermostat, coolant flush, power steering pump, alternator.
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