After a few years sitting, I got the 84 SVO (LA3 swap) back up and running. All was well for a little while, but it is having some intermittent misfires. Ran a KOEO test and here is what I got:
O Codes
54- IAT Sensor Open, Vane sensor out of range
81- Air diverter fault
82- integrated relay control module
83- EGR fault
For 54, I plan on cleaning out the VAM and replacing the IAT. If that doesn't work maybe a new meter is the way to go.
81, 82 and 83 all makes sense since the car has a gillis valve to control boost and the EGR is blocked off. Please correct me if I am wrong.
C Codes
27- vehicle speed sensor fault
54- IAT Sensor Open, Vane sensor out of range
72- system power circuit fault
The car has an LA3 swap, so the 27 code makes sense since its not installed.
For code 72, I have no idea where to start, open for suggestions.
I did do the normal tune up procedures. Motorcraft parts all around, new plugs, wires, cap and rotor, fuel filter, fresh unleaded 93 octane. I did do some research about this sort of problem and found that others have had a fuel line in the tank break and as the tank went down there were misfires around 3000 rpm. This kinda makes sense since the car did start missing as the most recent tank went down, but the above codes are making me think something is wrong under the hood. Especially since fuel pressure is steady at 39 psi when the engine is revved up.
Appreciate any help. Thanks
Greg