Miss and very lean
Posted: Mon Aug 20, 2012 8:19 pm
Took the car out in May and had the following problems: car missed in some corners. Real rough at idle when the engine cycles down from 1200 rpm to 900. Just started to work on the car last week and here is what I have done. New plugs and wires. Changed air box out with our other car that is working fine. Checked fuel pump flow as per Mike instructions, very good result! cleaned lifters. Replaced pcv. Replaced fuel filters. changed computer and edis. Changed green and brown relays.
Checked the engine codes test while not running. Had the following code:113 intake air charge temp above max voltage. Fixed this problem by changing the air temp connector to box.
Engine codes while running. 172 02 sensor fault/lean , 411 can't control rpm at low rpm check
412 Can't control rpm at high rpm check, 538 insufficient rpm change during response test. I know that A/F is all over the place when the car is not on the track, but compared both of our cars at idle and at 4000 rpm. Much higher readings on the car that I am having problems with. Not sure that means anything.
Replaced o2 sensor. replaced o2 connector. replaced pcv valve, replaced all vacuum hoses. Codes still there.
Car ran well last year. The only thing I did over the winter was take out the fuel cell and checked box etc. Could this be source of problem. Sounds electrical to me.
Checked the engine codes test while not running. Had the following code:113 intake air charge temp above max voltage. Fixed this problem by changing the air temp connector to box.
Engine codes while running. 172 02 sensor fault/lean , 411 can't control rpm at low rpm check
412 Can't control rpm at high rpm check, 538 insufficient rpm change during response test. I know that A/F is all over the place when the car is not on the track, but compared both of our cars at idle and at 4000 rpm. Much higher readings on the car that I am having problems with. Not sure that means anything.
Replaced o2 sensor. replaced o2 connector. replaced pcv valve, replaced all vacuum hoses. Codes still there.
Car ran well last year. The only thing I did over the winter was take out the fuel cell and checked box etc. Could this be source of problem. Sounds electrical to me.