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Member
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Join Date: Jul 2019
Location: Silent Hill
Posts: 289
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Member
Join Date: Jul 2019
Location: Silent Hill
Posts: 289
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What are the rest of the readings besides Nox?
Nox is created by high combustion temps. Some things that can cause high nox are:
Lean fuel conditions (vacuum leaks, bad or poor injector spray patterns, etc)
Carbon build up in combustion chamber/piston (causes slightly higher compression # causing higher exhaust temps)
Bad cat/cats, 21 year old cats have probably exceeded their service life to be honest. Expensive to replace, but if they are toast, they should be replaced.
You can try all the snake oil out there to get you to pass, but it's best to fix issues that are present.
Also what state are you in? Be aware that you 4runner may be put on the gross polluter list if the emissions are double what is permmited for the 4runner.
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Last edited by 2TH4IST; 08-04-2020 at 05:11 PM.
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