Avionics86

Was the motor cold when the adjustment was done?

TRD_Celica

very cold

vroom992

yeah reset the ecu

unplug battery for like ten minutes then start the car and let it idle for like 5 - 8 minutes and it will learn how to idle

then drive it around!

I do this after any type of modification (exhaust, valve adjustment, ..) i was told that what is necessary so make sure you dont forget

Kirpich

Don't _just_ unplug the battery for 10 mins.

1. Disconnect the batt.

2. Pull out the 'backup' fuse in the main fuse box (under dash).

3. after a few (like 15) seconds replace the fuse.

4. hook the battery up again.

5. put the code for the stereo and the radio presets.

6. let the car idle, _don't_ help it with throttle when it almost stalls.

lols2000

This is a very important step. The engine dying is a very important part of the ECU learning how to manage the engine.

redlining

Not wanting to thread jack or anything but i have a question...so when I went to a car show the other day we had to have our batteries disconnected and after the show when I started to drive back home the car was having problems with idle. Like when I pressed in the clutch it would go all the way down to a bar or two and then gradually go back up and it only lasted for like 15 mins. Was that the cause because it had to relearn its idle? If that is the case does that mean I probably need to do a valve adjustment on mine already? If it had to relearn an idle then it would have a little bit of a difference then stock valve adjustments and would make it do that right??

TRD_Celica

Probably had to relearn its idle, yes. As far as valve adjustment, if you feel you needed one then go for it. Here was my reason I wanted mine done

1. A lot of ticking clatter noise
2. Idle hesitation
3. Sluggish acceleration
4. Car had 107k miles without a single adjustment
5. Was sitting on jackstands for 2 weeks so I had some free time
6. I didn't want to waste money so I had the confidence to do it myself (never opened a valve cover in my life)

Results: Other than the idle problem (had a vacuum leak/bad plugs) the engine idles a lot smoother now, the clatter noise minimized, the engine response was defiantly increased, and I hate to say it but my even my mpg went up a tad. Feels like a new car!

dr.s2k

if the change was sudden, it's because you need to let your ecu relearn idle after it was reset. your valve clearance hasn't suddenly gone out of spec because you disconnected the battery - if you let the car re-learn idle it should go back to how it was before the car show.

however if you have the tapping sounds etc and want to adjust the valves anyway you should go ahead and get it done.

rsx>s2k

my motor went bye bye after i did mine lol