Civic DX Coupe L4-1590cc 1.6L SOHC MFI (1999)
^
Turn the screw clockwise, and count the number of turns (both full and partial) it takes to fully seat the screw.
^
Turn the screw counterclockwise back to its original setting.
^
Subtract the number of clockwise turns it took to seat the screw from 3-1/2. Record that number. Example: If it took two full turns to seat the
screw, subtracting 3-1/2 from that gives you 1-1/2.
3.
Start the engine, and let it warm up to its normal operating temperature (the cooling fan cycles twice).
4.
Turn off all electrical items (A/C, audio unit defogger, lights, etc.). Center the steering wheel so there is no power steering load.
5.
Connect the PGM Tester or HDS to the 16P data link connector (DLC).
6.
Turn on the PGM Tester or HDS. Enter the VIN and odometer reading.
7.
Follow the screen prompts on the PGM Tester or HDS to get to DATA LIST. Scroll down the list to IAC.
8.
While watching the IAC counts on the PGM Tester or HDS, slowly turn the air bleed screw (either counterclockwise or clockwise) until the IAC
count reaches 1 (or 7 for '99-00 Odyssey) or you have turned the screw counterclockwise a total of 3-1/2 turns. (Count the number of
counterclockwise turns you have made, and add that number to the screw setting you recorded in step 2.)
^
If you see an IAC count of 1 (or 7 for '99-00 Odyssey), turn the screw clockwise 1/2 turn, and then go to step 9.
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If you do not see an IAC count of 1 (or 7 for '99-00 Odyssey), and you have turned the screw counterclockwise a total of 3-1/2 turns, leave the
screw set where it is. Go to step 9. You should never set the air bleed screw counterclockwise more than 3-1/2 turns from its seated position. If
you set the screw further it could work itself out of the throttle body over time.
9.
Let the engine idle for 10 minutes to allow the ECM/PCM to learn the new idle parameters.
10.
Turn the ignition switch to LOCK (0). Turn off and disconnect the PGM Tester or HDS.
INSPECTION PROCEDURE B
1.
Access the air bleed screw on the throttle body.
2.
Record the current setting of the screw:
^
Turn the screw clockwise, and count the number of turns (both full and partial) it takes to fully seat the screw.
^
Turn the screw counterclockwise back to its original setting.
^
Subtract the number of clockwise turns it took to seat the screw from 3-1/2. Record that number. Example: If it took two full turns to seat the
screw, subtracting 3-1/2 from that gives you 1-1/2.
3.
Start the engine, and let it warm up to its normal operating temperature (the cooling fan cycles twice).
4.
Turn off all electrical items (A/C, audio unit, defogger, lights, etc.). Center the steering wheel so there is no power steering load.
5.
Connect the PGM Tester or HDS to the 16P data link connector (DLC).
6.
Turn on the PGM Tester or HDS. Enter the VIN and odometer reading.
7.
Follow the screen prompts on the PGM Tester or HDS to get to DATA LIST. Scroll down the list to IAC.
8.
While watching the IAC counts on the PGM Tester or HDS, slowly turn the air bleed screw (either counterclockwise or clockwise) until the IAC
count reaches 7 or you have turned the screw counterclockwise a total of 3-1/2 turns. (Count the number of counterclockwise turns you have made,
and add that number to the screw setting you recorded in step 2.)
^
If you see an IAC count of 7, turn the screw clockwise 1/2 turn, and then go to step 14.
^
If you do not see an IAC count of 7, and you have turned the screw counterclockwise a total of 3-1/2 turns, leave the screw set where it is. Go
to step 9. You should never set the air bleed screw counterclockwise more than 3-1/2 turns from its seated position. If you set the screw further
it could work itself out of the throttle body over time.
9.
Turn the ignition switch to LOCK (0). Remove the throttle body (see the Fuel and Emissions section of the appropriate service manual).
