David,
by changing the battery all that did was drain the power from the ecm/vcm and doing that causes all the stored codes to clear. If it is a persistent problem the code will return.
I had the same problem and as soon as I changed the battery it went away.
Areas of concern that have caused this code to set are as follows:
- Leaking air horn between the mass air flow sensor and the injection holder
( quantity 2 ). Loose bolts found.
Air leak.
- Failed air temperature sensor ( integral part of the mass air flow sensor assembly) (
quantity 4 ).
- Air temperature sensor read -45 degree C. when actual air temperature was 30 to 36
degree C..
This is an open in the Air temperature sensor circuit.
- Leaking cup seal between the injection holder and the throttlebody.
Seal was cut or folded. ( quantity 11 ).
Air Leak.
- Blocked filter in the injection holder. Fuel restriction
Leaking Main injector O-ring or seal ( quantity 2 ).
O-ring was cut and seal was cut.
Air leak.
- Cracked intake manifold. Cracks on either side of the outer intake runner close to the center
where the injection holder and throttlebody mounts ( quantity 2 ).
Suspect cracked by backfiring.
- Air Leaks and loss of fuel delivery to the cylinders.
- Air cleaner restriction. By dirt. The dirt got wet and became mud like ( quantity 1 ).
Restricted air flow.
- Vaporizer leaking internally. Fuel pressure is too high ( quantity 8 ).
Irregular air fuel ratio.
- Air fuel ratio. Fuel pressure is too low. Fuel lock plunger is stuck shut, vaporizer
malfunction, Filter screen blocked, open check valve
- Leaking injection holder check valve. Stuck valve.
what are the hrs on this unit?
E 43 is an air fuel ratio problem. Check for vacuum leaks or anything that could cause the air fuel mixture to be off. Check your O2 sensor signal wire it should fluctuate between.200 milivolts lean and.800 milivolts rich. Pinch off fuel line to see if it changes if rich or spray lp around intake if lean. You could also have an under reporting dirty MAF sensor if you are running lean.