Throttlebody Idle Adjustment?
01-11-2009, 12:28 PM
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Throttlebody Idle Adjustment? I purchased a new throttlebody (90mm MSD) and it doesn't have and idle hole just a set screw and of course no instructions. So my question is how do i adjust the screw to make the car idle properly? Help would be greatly appreatated!!
01-15-2009, 09:55 PM
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While the previous poster is somewhat correct, it's not the full story. The IAC motor will attempt to change position, but if the default position of the set screw is too far off either way, it will go out of range and be unable to compensate.
You need a tune to go to a 90mm TB, since some table will be messed up. After attaching TB and correcting the tables, monitor your IAC steps. It should be somewhere below 100. I've seen recommendations for cammed cars in the 50-60 range, but I think slightly higher is fine. Once dialed in, shut the car off. Unplug the TPS connector. Put key in ignition and turn on (not start) for about a minute. Turn key off and plug TPS back in. This should reset the sensor. Monitor TPS and TPS voltage. TPS should be 0% and voltage should be under 1.25 volts.
That should be it.
You need a tune to go to a 90mm TB, since some table will be messed up. After attaching TB and correcting the tables, monitor your IAC steps. It should be somewhere below 100. I've seen recommendations for cammed cars in the 50-60 range, but I think slightly higher is fine. Once dialed in, shut the car off. Unplug the TPS connector. Put key in ignition and turn on (not start) for about a minute. Turn key off and plug TPS back in. This should reset the sensor. Monitor TPS and TPS voltage. TPS should be 0% and voltage should be under 1.25 volts.
That should be it.
01-16-2009, 09:01 AM
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While the previous poster is somewhat correct, it's not the full story. The IAC motor will attempt to change position, but if the default position of the set screw is too far off either way, it will go out of range and be unable to compensate.
You need a tune to go to a 90mm TB, since some table will be messed up. After attaching TB and correcting the tables, monitor your IAC steps. It should be somewhere below 100. I've seen recommendations for cammed cars in the 50-60 range, but I think slightly higher is fine. Once dialed in, shut the car off. Unplug the TPS connector. Put key in ignition and turn on (not start) for about a minute. Turn key off and plug TPS back in. This should reset the sensor. Monitor TPS and TPS voltage. TPS should be 0% and voltage should be under 1.25 volts.
That should be it.
You need a tune to go to a 90mm TB, since some table will be messed up. After attaching TB and correcting the tables, monitor your IAC steps. It should be somewhere below 100. I've seen recommendations for cammed cars in the 50-60 range, but I think slightly higher is fine. Once dialed in, shut the car off. Unplug the TPS connector. Put key in ignition and turn on (not start) for about a minute. Turn key off and plug TPS back in. This should reset the sensor. Monitor TPS and TPS voltage. TPS should be 0% and voltage should be under 1.25 volts.
That should be it.
01-16-2009, 10:29 AM
#6
While the previous poster is somewhat correct, it's not the full story. The IAC motor will attempt to change position, but if the default position of the set screw is too far off either way, it will go out of range and be unable to compensate.
You need a tune to go to a 90mm TB, since some table will be messed up. After attaching TB and correcting the tables, monitor your IAC steps. It should be somewhere below 100. I've seen recommendations for cammed cars in the 50-60 range, but I think slightly higher is fine. Once dialed in, shut the car off. Unplug the TPS connector. Put key in ignition and turn on (not start) for about a minute. Turn key off and plug TPS back in. This should reset the sensor. Monitor TPS and TPS voltage. TPS should be 0% and voltage should be under 1.25 volts.
That should be it.
You need a tune to go to a 90mm TB, since some table will be messed up. After attaching TB and correcting the tables, monitor your IAC steps. It should be somewhere below 100. I've seen recommendations for cammed cars in the 50-60 range, but I think slightly higher is fine. Once dialed in, shut the car off. Unplug the TPS connector. Put key in ignition and turn on (not start) for about a minute. Turn key off and plug TPS back in. This should reset the sensor. Monitor TPS and TPS voltage. TPS should be 0% and voltage should be under 1.25 volts.
That should be it.
