Idle learn procedure for Newer 2.0L

Post by **PrecisionBoost** » Wed Jun 15, 2005 6:43 am

If you reset your ECU and you don't do the proper IDLE learn procedure your car will idle funny.

Here is the idle learn procedure for the Optra/Forenza/Optra5/Reno....

1) Attach Battery cables (which were off for the reset of the ECU)
2) Turn off all accessories
3) Start engine, let it run for 10 seconds
4) Turn off ignition and leave it off for 1 minute
5) Start engine and allow car to warm up so that the coolant temperature exceeds 85 degrees Celcius
6) let the car idle for another 10 minutes
7) Turn on the A/C for 1 minute (if equiped)

Turn off the ignition

Idle learn procedure finished.

kinkyllama · Post by **kinkyllama** » Wed Jun 15, 2005 6:49 am

how do you know when the coolant is 85 degrees?

I havnt done that and my idle is fine... so far

Post by **PrecisionBoost** » Wed Jun 15, 2005 6:58 pm

That's 85 degrees Celcius so that's 185 degrees F

It says 85/185 or higher.... so as long as the temperature needle has moved up a little ways.

Basicly they want to make sure that the car is warm.... so that would be the regular temparature you would get if your car was sitting there at idle

If your idle is fine after a reset then your fine and you don't have to do this procedure..... I've reset the ECU about 15 times now and this is the first time I've had a problem with the idle.

Somehow my Idle air control valve was open when the power was removed so when I reset the ECU and reattached the power it wasn't in it's fully closed position.

Since the IAC system does not "sense" the position of the valve it simply moves back and fourth a certain number of steps (24 each way)

So my valve was allready open 10 steps and when it was cold it opened it up way too much (since it did not realize that the valve was open allready)

Needless to say my car idle is at 3000RPM all the time..... it's really annoying.... speaking of which I should go do this idle learn procedure.

ChiPPy · Post by **ChiPPy** » Sat Jun 18, 2005 2:43 am

My Optra seems to have an idle issue when revving down..... it seems to take an excessive amount of time to idle down after revving. It can take 6 seconds or more to slow down from 3000rpm after putting the car in nuetral or putting in the clutch pedal after an acceleration. Would this be related to a bad idle learn setup? Would most dealerships know this procedure? The only time i've ever had the battery removed was when I had a warranty issue resolved with the timing belt cover.

kinkyllama · Post by **kinkyllama** » Sat Jun 18, 2005 6:35 am

It wont hurt to try...

Post by **PrecisionBoost** » Sat Jun 18, 2005 6:04 pm

That problem your having is not related to the idle air control valve and I should add that I tried this idle learn procedure several times and I didn't like the way it set the car up so I did something different.

With the idle learning procedure the car would stay at 3000rpm until the car is warmed up.... which is basicly the same annoying problem I was having before.

So this time I warmed up the car until it was at normal operating temperature, disconnected the battery, let it sit for 15 minutes, started up the car and drove it around right away.

Now it starts up at 3000RPM... sits there for about 5 seconds.... drops to about 1800RPM and stays there until the car warms up ( about 30 seconds of driving )

So now.... I'm going to leave it alone.... I'm happy with this setup.

I also have the problem of the RPM being slow to go down but that's due to the huge mother flywheel on the car.... which keeps the RPM from dropping quickly.

The heavy flywheel is good and bad.... it sucks for shifting but supposedly a heavier flywheel will give you more torque.

kinkyllama · Post by **kinkyllama** » Tue Jun 21, 2005 9:38 pm

Wow that still idles high though. If it isnt cold out my car just jumps up to 2k rpms when i start it up for maybe a couple seconds then goes normal the rest of the time...

woo · Post by **woo** » Tue Jun 21, 2005 11:47 pm

ever since i put an intake on, and more so ofter the exhaust was done, my car revs a bit higher on start up and idles a little higher, but it idles smoother so i dont care

Post by **PrecisionBoost** » Wed Jun 22, 2005 5:10 am

My car used to idle lower but it's just since I've been screwing around with the ECU's that I encountered the problem.

I think I'm going to have to make a pulsing circuit to move the idle air control motor a couple of steps closed... this would make it idle lower at startup and during driving ( which is still fairly high.... usually around 1500 RPM )