Idle surges when it warms up.

92 camry failed smog because running rich. Why? - Toyota Nation ...

www.toyotanation.com/.../411132-92-camry-failed-smog-because-runni...

Apr 26, 2012 - 15 posts - ‎9 authors
off ignition timing, and the car was running to rich. the timing i will get fixed tomorrow but the rich .... Our 93 camry le with 4 cly engine failed agin a few weeks ago, both our toyotas always fail.. they are .... 1991 Toyota MR2 V6 91 MR2 N/A Rough Idle, Running Rich, No Accelleration
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Toyota Camry running rich Questions & Answers - Fixya

www.fixya.com > Forum > Tags > running rich > Cars & Trucks > Toyota

... running rich I have a 1991 Camry that is running rich. I just replaced the O2 sensor and a new cat, oil change, new spark plugs. The car wont pass smog. it is ...

1992 Toyota Camry XLE V6 Excessive Running Rich ...

? 0:21
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Aug 16, 2013 - Uploaded by StreetSports1
1992 Toyota Camry XLE V6 Excessive Running Rich ... 1997Toyota Camry V6 forward Oxygen (O2) Sensors .

Did you top up the oil? some cars will shut down when the oil light comes on it usualy turns off the fuel pump and is a safey design of the car to stop the engine in a roll over situation and can also save your engine if it runs low on oil.

idle learn procedure:

turn off all electrical items (AC fan, audio, lights, defogger, etc.)
Start the engine and hold it at 3,000 rpm with no load (in park or Neutral) until the radiator fan comes on or the engine coolant gauge shows normal running temp.

Now let the engine idle for a minimum of 5 mins with no electrical loads. If the radiator fan cycles on during this time, you must add the fan running time to the 5 mins.

if you tap the EGR valve and you get a response replace it
if you tap anything else and get a response replace it

petrol engine running on when switched off is excessive carbon deposits in head glowing and igniting the incoming mixture,,if in diesel the fuel shut off solinoid is not working

Check for air leaks in the vacuum pipes in and around the inlet manifold, they have a habit if going brittle and splitting.
Another possibility is the temp sender , if the ecu thinks the engine is too cold it will compensate causing the engine to " hunt". This can be something as simple as a worn radiator cap seal letting air into the cooling system and tricking the sensor.
Hope this helps, Marshall

yes it could be a fuel related problem, when was your last tune up, it could also be a spark issue, old or corroted spark plugs will sometimes not put out the correct amount of heat to ignite the gas correctly till it runs for a while, if the check engine light isnt lit, it will almost have to be something simular to this

block off vacuum hose to brake booster and see if idle returns to normal if it does you need new brake booster has hole in diaphram internally some times slight hissing noise is evident in cab when pressing brake pedal to section where engine surges or idles high. also check for fuel leaks from hoses if you can smell fuel in engine bay while running and engine warm some leaks only leak while running and hot

idle air control needs cleaned or repllaced