problem corolla s 2004 - Toyota Nation Forum : Toyota Car and Truck Forums

sarathrp88 · 10-20-2011, 11:37 AM

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mikered30 · 10-20-2011, 12:27 PM

Is this a 1zzfe engine? Can you clean the throttle body and idle air control valve? Check for Any vacuum leaks.

sarathrp88 · 10-20-2011, 08:19 PM

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mikered30 · 10-20-2011, 09:03 PM

Check here to clean the TB and IACV: http://matrixowners.com/index.php/to...idepics-incld/

You can clean the IACV by spraying throttle body cleaner down the IACV port (small rectangular hole just in front of the butterfly valve in the throttle body), but that will not clean it as thoroughly as the guide shows above. Make sure you have the correct gaskets before you dig into the removal of the IACV. Disconnect the battery after cleaning for about an hour and then reconnect it.

Any check engine lights on? If cleaning that does not fix it, you will have to look for vacuum lines that are loose or broken.

invader · 10-20-2011, 11:55 PM

How many kms on it? If you're still on original intake manifold gasket, it most likely is leaking (vacuum leak) and affecting idle quality. New revised Totota gasket is orange instead of black, and is inexpensive. Oily dark residue by the gasket will be visible where the intake manifold sits on engine head if it is leaking. It's easy enough to replace.

Quote:

Originally Posted by invader

1st pic shows elusive brake booster vacuum hose on intake manifold, which is hidden once throttle body is installed... Intake manifold gasket was easily replaced on friend's 2005 without draining any coolant or disconnecting throttle body coolant lines, by setting (+cleaning) throttle body aside.

sarathrp88 · 10-21-2011, 11:30 AM

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mikered30 · 10-21-2011, 04:04 PM

Idle at 800 is perfect, is it vibrating? That screw is not for idle adjustment, I believe that is a hose clamp for the air filter housing. Can you reword what you said about the brake pedal?

sarathrp88 · 10-21-2011, 04:51 PM

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mikered30 · 10-21-2011, 09:38 PM

So are you saying that your rotors may need to be resurfaced along with new pads?

invader · 10-21-2011, 09:44 PM

sarathrp88's engine vibrates when idle rpm drops while braking hard under more brake booster's vacuum assist... Replace intake manifold gasket, and also check all vacuum hoses.