Misfires on Bank 1 - 02 4.6is

[johnqpublic99]

Originally Posted by upallnight

If the misfire is only at idle, but smooth out once the throttle is opened, then most likely you have a vacuum leak. Vacuum is highest at idle because the throttle plate is closed.

Real data (Short Term Fuel Trim) on Torque will show you if bank one is running lean compared with bank 2. If the Short term data shows a plus value that means the computer is adding fuel to the bank because the mixture is lean. If the number is negative, that means the bank is running rich and the computer is taking fuel away from the bank.

Learn to use Torque and report what the fuel trim data are for both bank.

Ok... I configured torque to show me the fuel trim for sensor 1 on bank 1 & 2 but for some reason only shows me the option for short term fuel on bank 1 only... the numbers vary continuously between +- 7 on both fuel trim when I'm running above idle. On multiple occasions, as I'm slowing down at a red light, sensor 1 bank 1 number goes really high (like +25)... coincidentally, as I stop at a red light, the component status window shows me falling into open loop "because of system failure" and the fuel trim goes to 0.0 on both banks. Once I get going again, I come back into closed loop operation and fuel trim numbers start showing up again.

One last thing... on the emissions readiness panel... everything shows ready except for CAT which is in not ready state.

DF