Hope everyone is doing great.
Please clear up some confusion I have related to my LM7 which is a drive by cable throttle body. I have a throttle position sensor (TPS) and an idle control valve (IAC) on my throttle body. I have confirmed after cleaning the IAC and the hole it installs into on the throttle body (disconnected the battery for 30+ min) that with my Torque Pro app that my IAC is providing the correct range of “counts” moves at the appropriate times and settles in around 38 to 40 at idle.
So here is the question. Should the absolute throttle position read 0% at idle? Mine reads sometimes 0.39 and others 0.0. Sometimes at idle it even fluctuates between the two. There is a correct range to 100% at WOT. With KOEO, it reads 0.0%. Then most of the time, when the engine is started, it goes to 0.39%. Funny thing is, with the 0.39 readings, I get random misfires in most of my cylinders. (No misfires other than at idle) Not many just 2 to 4 per cycle. If I put the A/C on to induce a load, the throttle position stays at 0.39, RPMs stay at 550, pulse width increases and the misfires seem to go away.
Is the ECM seeing the 0.39 and it’s associated voltage and thinking more air is entering the system than is really being supplied? Fuel trims (short and long) are below 5 on both banks and MAF reads a steady 4.8 g/s. If 0.39 is not what it should be reading at idle on a drive by cable throttle body than maybe that is a good place to start given the additional load test. Please confirm so I do not go off chasing a dead end.
Thanks.
Please clear up some confusion I have related to my LM7 which is a drive by cable throttle body. I have a throttle position sensor (TPS) and an idle control valve (IAC) on my throttle body. I have confirmed after cleaning the IAC and the hole it installs into on the throttle body (disconnected the battery for 30+ min) that with my Torque Pro app that my IAC is providing the correct range of “counts” moves at the appropriate times and settles in around 38 to 40 at idle.
So here is the question. Should the absolute throttle position read 0% at idle? Mine reads sometimes 0.39 and others 0.0. Sometimes at idle it even fluctuates between the two. There is a correct range to 100% at WOT. With KOEO, it reads 0.0%. Then most of the time, when the engine is started, it goes to 0.39%. Funny thing is, with the 0.39 readings, I get random misfires in most of my cylinders. (No misfires other than at idle) Not many just 2 to 4 per cycle. If I put the A/C on to induce a load, the throttle position stays at 0.39, RPMs stay at 550, pulse width increases and the misfires seem to go away.
Is the ECM seeing the 0.39 and it’s associated voltage and thinking more air is entering the system than is really being supplied? Fuel trims (short and long) are below 5 on both banks and MAF reads a steady 4.8 g/s. If 0.39 is not what it should be reading at idle on a drive by cable throttle body than maybe that is a good place to start given the additional load test. Please confirm so I do not go off chasing a dead end.
Thanks.