surges when stopping
05-25-2005, 10:49 PM
#1
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surges when stopping the only time it surges is when the TPS is 0 and moving very slow in Drive (coming to a stop) or when im driving i put the car in Neutral and it surges until i stop completely....
please help... this is the last phase
i do have a 4000 stall if that means anything
please help... this is the last phase
i do have a 4000 stall if that means anything
05-26-2005, 03:52 AM
#2
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is your SES light on? my 98 Z used to surge at idle and it was the CKP 336 code. I sold the car before I could resolve the problem. Check that out and then post back up.
05-26-2005, 04:22 AM
#3
sounds like the idle airflow vs. ECT table might be a little high (computer thinks it needs more air to stay running than it really needs).......once you STOP, the computer has time to "level out" and "figure out" that it needs less IAC......
which leads to another thing to look at also:
Did you drill your TB hole out (or adjust the idle stop screw and reset the TP sensor)? If so, you might also want to look at the IAC Position vs. effective area table. This table tells the computer how much air the engine can get in (TB hole/leaks around the throttle blade/the PCV/etc.....non IAC) with the IAC at any possision (closed to wide open). If this table is off the computer will THINK it needs more IAC than it really does so it takes longer for it to come down to where it SHOULD be.
which leads to another thing to look at also:
Did you drill your TB hole out (or adjust the idle stop screw and reset the TP sensor)? If so, you might also want to look at the IAC Position vs. effective area table. This table tells the computer how much air the engine can get in (TB hole/leaks around the throttle blade/the PCV/etc.....non IAC) with the IAC at any possision (closed to wide open). If this table is off the computer will THINK it needs more IAC than it really does so it takes longer for it to come down to where it SHOULD be.
05-27-2005, 11:44 AM
#5
Originally Posted by ty_ty13
The IAC's at idle are between 50-60 so and i drilled a small hole and then reset the TPS... did both....
Check that "IAC Position vs. effective area" table I told you about. You have increased the amount of air getting into the engine at every IAC point (because of the larger TB hole) and the computer does not know this. Move it over a cell or two and go try it. You will have to play a little till you find the right spot.
