idle raises to 2000rpm when car moves
#1
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idle raises to 2000rpm when car moves
I have ls1 edit and was wondering if anyone can tell me what to change to stop the idle problem. The car was tuned with a different combo since then i changed the cam and map sensor and now the car does this. PLEASE DONT TELL ME ITS A VACUME LEAK! it was tuned to do this with the old cam i just dont know what to change. the car idles perfect in p,n, and drive but as soon as you start rolling it raises iam guessing the speed sensor in the trans tells the computer the car is moving?
#7
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the numbers are additional airflow... this table offsets the IAC. Personally, when I tune a car, I set the whole table at 0 and add 1.5g to the 400 RPM column everywhere except the 0 MPH row. This is just used to help catch things if it ever dips this low. If your base running airflow table is correct, I'm not sure why this table would really be needed in most cases.
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#9
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Originally Posted by Frost
the numbers are additional airflow... this table offsets the IAC. Personally, when I tune a car, I set the whole table at 0 and add 1.5g to the 400 RPM column everywhere except the 0 MPH row. This is just used to help catch things if it ever dips this low. If your base running airflow table is correct, I'm not sure why this table would really be needed in most cases.
The reason people usually think it's the throttle cracker is because the car stops adjusting the IAC to keep idle rpm when you cross the throttle cracker threshold (when you start moving). It makes sense, the idle trims shouldn't learn if the throttle cracker is messing with IAC position. But the root problem is not the throttle cracker value, it's the idle airflow value.
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Use a scan tool for the IAC, see what the counts or steps are. If they are above 60ish then use the set screw to open the throttle blade a bit, reset the tps, and monitor steps again. RAF is the base aiflow table in the PCM, the IAC is the mechanical part that executes all the RAF, throttle caracker/follower functions.