Having problems with your 1998 Toyota Avalon ?

I own a 1998 Toyota Avalon XLS and I'm having a problem with emission test, the NO reading is 3 times higher than the limit. Can you please let me know what cause this problem as I already replaced the EGR Valve and Catalytic converter. THANKS!

Posted / edited by AnonymousUser on : 13-08-2018

Answers :

If the CO, HC, and O2 readings are average, then I still suspect the ERG is not being controlled correctly. The EGR should be cold at idle because the EGR ruins the engine vacuum at idle, so must be shut off. And get hot at mid range speed. You can usually feel it with your hand. If it is not opening, then try to manually open it. If it is vacuum, then put a vacuum to its hose port directly. It is it electric, then hot jump it. It is does not cause idle to drop, it is frozen or clogged.

If CO, HC, and O2 readings are below average, then the engine is just running too lean and that gets too hot. Check the sensors, temp, O2, an air mass. An ohmmeter reading of 0 or infinite is bad. The air mass and O2 sensor often are just dirty and need cleaning. PCV foam on the air mass sensor, and carbon on the O2.
Repair Help & Product Troubleshooting for 1998 Toyota Avalon

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