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Discussion Starter #1 (Edited)
Hi folks,

I used to have a K&N airfilter installed that looked like this (obviously after removing the stock
one).

Today, I decided to put the stock back, and so I did.

Then, I went to connect the battery, and start the engine.

The engine starts fine. BUT, it idles at around 500RPM and when I turn on the
AC it doesn't cool properly.

But when I open the throttle a by stepping on the pedal a bit, causing the RPM
to raise to around 550 or higher, then the AC starts to cool properly.

EVERYTHING was working OK. All I did is putting the stock air-intake system
back.

Any idea what's going on?


APPENDIX:
Stuff I connected:
* 2 pipes (one is thin, one is thick),
* air sensor.
 

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Just drive it around for ten minutes, it should fix itself. If you disconnected the battery the computer needs to figure out how your engine should run/idle at your altitude and such. It takes a few minutes, especially on toyotas, for the engine to idle normally after the battery is disconnected.
 

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If its not fixed after putting some miles on it, you may have a vacuum line or something undone that you didnt notice. Im pretty confident it just needs to be driven/learned though.
 

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It wouldn't hurt to clean out the throttle body and MAF sensor. The K&N are notorious in getting them dirty if over-oiled.
 

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what he said....

Also, make sure the MAF sensor plug is in the right spot. I had a buddy who switched his after installing a CAI and we couldn't figure out what was going on... UNTIL we reviewed the pics of the CAI swap and noticed that the sensor plugs were switched.

I thought he was going to cry... He thought he broke his FJ...

After we figured it out (1 day later) he has now put on more than 60k miles on his rig without incident.

clean the MAF sensor and then make sure you walk through each step carefully. You will be fine.
 

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Discussion Starter #10
Hi! You guys are awesome. All it needed is to wait a bit until it re-learns
the proper settings (as you've suggested).

But I did not drive it yet. I just did some really minor stuff like letting the car
stand in idle position for a few minutes, then did a few changes, namely: turned AC
on, put the gear on D, and R and drove a bit backward and forward. Maybe just
1 or 2 meters of distance.

While I was doing that, the car shutdown two times. But then it got somehow
stronger and could survive while learning. Once the process above was over,
the car was perfectly on normal RPM.

Neat :)
 

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Hi! You guys are awesome. All it needed is to wait a bit until it re-learns
the proper settings (as you've suggested).

But I did not drive it yet. I just did some really minor stuff like letting the car
stand in idle position for a few minutes, then did a few changes, namely: turned AC
on, put the gear on D, and R and drove a bit backward and forward. Maybe just
1 or 2 meters of distance.

While I was doing that, the car shutdown two times. But then it got somehow
stronger and could survive while learning. Once the process above was over,
the car was perfectly on normal RPM.

Neat :)

its really weird how that stuff works, huh? Glad that took care of it for you!
 

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Mine always dies on the first start after disconnecting the battery. Without fail. It is totally fine on the second start and thereafter. Just the ECU tuning itself to the engine.
Ditto
2nd start fires up normally after battery disconnect
cheers
Baz
:blueblob:
 

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Ditto
2nd start fires up normally after battery disconnect
cheers
Baz
:blueblob:
You have to prime the fuel lines, let the fuel pump run for about 5 sec., by turning the ignition switch to ON (don't start engine right away.)
 
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