I got a ported throttle body from west coast corvette, an ls6 intake manifold, and MSD ignition wires. Hooked it all up took me about 4 hours or so and started her right up and she flew up to 2,000rpm's and then just dropped back down to 900rpm's I am guessing thats just the computer retuning itself then right?

 

well if that's all it did that seemed unusual, if it was me i would just relax and enjoy!

 

haha ok I am going to try to take it out for a drive later and see if it runs ok.

 

C5 Idle Relearn Procedures:

The car will re-learn simply by driving it between 50-100 miles. Or, the actual way to do it more quickly, is the following procedure:

1) Insert key into ignition and turn to the “ON” position, but, DO NOT START THE ENGINE.
2) Open the engine compartment fuse box cover and remove the two 10 amp fuses from position numbers 16 & 23.
a) According to the manual there are two fuse boxes. Use the engine compartment fuse block for this procedure not the instrument panel fuse block.
b) Engine Compartment Fuse Block (correct one): 16 is Powertrain Control Module A and 23 is Powertrain Control Module B.
c) Instrument panel fuse block (wrong one): 16 is Air Bag, 22 is Body Control Module-Ignition and 23 is Body Control Module-Ignition 2.
NOTE: Your DIC will now display “check” messages for ABS, etc… Do not worry as this is normal.
3) Turn the ignition key to the “OFF” position.
4) Return to the engine compartment fuse box and re-insert both 10 amp fuses for positions 16 & 23.

5a) Idle relearn for an M6:

1) Start the engine and allow the coolant temp to reach a minimum of 176 degrees F. Allow the engine to run at this minimum temperature for at least 5 minutes.
2) After the 176 degree, 5 minute minimum run, shut down the engine for a minimum of 30 seconds.
3) Restart the engine and check for DIC error codes (there should be none).

5b) Idle relearn for an A4: (different)

1) Start the engine and allow the coolant temp to reach a minimum of 176 degrees F. Allow the engine to run at this minimum temperature for at least 5 minutes.
2) Allow the car to idle in DRIVE, with air ON and then OFF, for 5 minutes each, and then in NEUTRAL, with air ON and then OFF, for 5 minutes each.
3) Turn the car off for at least 30 seconds.
4) Restart the engine and check for DIC error codes (there should be none).

6) Drive car for a minimum of 30 miles at varying rpm settings and speeds. PCM will now re-learn and adjust for the new air flow and temperature at the intake.
a) If error codes persist, repeat steps 1-7. Make sure fuses are properly inserted before repeating steps.
b) Do not deviate from the sequence outlined above. If you do, restart the sequence from scratch.
c) Steps 1-4 are also necessary if you ever disconnect your battery or lose power for any reason.

 

thank you I am going to go try this.

 

thank you very much man it worked now she idles at 700 with no problem thanks!!!!

 

Have a Happy New Year

 

you too dude

 

Tell me if it actually works.I am having the same exact problems as you when I installed my ported tb and I have tried to relearn procedure 3-4 times with no results.

 

yeah it worked man. i dont understand why yours doesnt, what mods do you have?

 

my other mods were irrelevant because the high idle only started right after the TB install.

Did you follow the EXACT instructions posted or did you cheat around anything?

Also if anyone can answer this,would small leak in between the TB and the intake manifold cause a high start up idle?

 

I did the exact procedure as listed in 5a above for the M6..I actually let the car idle at that temp for about 7 minutes to be safe and i let the car sit turned off for 1.5 minutes to be safe once again..and yes an air leak will make it idle higher cause obviously its sucking more air then it should, do you still have your old TB?

 

Joe I have 2 quick question.
1)On the first startup after you pulled the 2 fuses,put them back in and turned the ignition to "off",did the vehicles startup idle jump to that 1500-200 range?
2)Did you begin the procedure on a cold engine(meaning vehicle sitting overnight)?

 

Was the trottlebody ported professionally or is it a home port job? If not done properly, it can let too much air past the TB blade, causing idle problems.


"1)On the first startup after you pulled the 2 fuses,put them back in and turned the ignition to "off",did the vehicles startup idle jump to that 1500-200 range?"

The procedure says turn the ignition off, THEN plug the fuses back it. It probably won't change your results, but its probably not a great idea to be plugging the fuses for the PCM back in with power applied.