Idle - slow and surging ? - Toyota Nation Forum : Toyota Car and Truck Forums

alotawatts · 05-10-2007, 05:31 PM

My idle is a bit slow and surging ...
Any ideas ?
2000 4cyl
thx

popeye08 · 05-10-2007, 06:11 PM

ECT(engine coolant temperature) sensor problem

MIC0417 · 05-11-2007, 11:53 AM

Do you mean hesitant, weak idle, that can be fixed by cleaning the TB and a new air filter.

alotawatts · 05-11-2007, 06:52 PM

Quote:

Originally Posted by MIC0417

Do you mean hesitant, weak idle,

No ...... it's just that the rpms are not steady........

***toyomoho*** · 05-11-2007, 10:27 PM

Look at the IAC valve and MAP sensor.

Mike Gerber · 05-12-2007, 04:45 PM

Check carefully for vacuum leaks. Also check the large tube leading to the throttle body for leaks and cracks. Unmetered air entering through cracks there can cause an unstable idle.

Mike

popeye08 · 05-12-2007, 09:32 PM

At first find wherer the sensor connector is on the engine, you can download the manual to find it. When the engine is surge, just pull out the plug to disconnect the sensor, if stable, you must have a bad ECT sensor. About $40 in Autozone.

It probably has a dirty IAC valve as well, so the idle is low. Just search in this forum and clean it

Quote:

Originally Posted by popeye08

ECT(engine coolant temperature) sensor problem