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Old 08-04-2020, 06:35 PM
Dieselchessy Dieselchessy is offline
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Join Date: Dec 2019
Location: SW Washington
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Dieselchessy Dieselchessy is offline
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Join Date: Dec 2019
Location: SW Washington
Posts: 595
Dieselchessy has a spectacular aura about Dieselchessy has a spectacular aura about Dieselchessy has a spectacular aura about
High NOx means your chamber temps are high.

You should flush your coolant system, refill with 50/50 and maybe put in some water wetter.
You should run a tank of gas with a full bottle of Seafoam, maybe 2 tanks with full bottles to clean out any carbon.
Make sure you don't have any vacuum leaks, change your fuel filter, clean the IAC, MAF, and replace O2 sensor. Anything that would cause it to run lean.
When was your timing belt replaced. Any chance timing is off?
Correct plugs installed?
What oil you running and when was it changed? Maybe run some Marvels to remove sludge.
When was the fuel filter changed.
Thermostat installed correctly?

You need to cool the combustion chamber some and prevent pre-ignition.
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Owned 82, 83, 87 pickup, 98, 99 SR5 4runner
Currently own a 98 SR5, 5spd, 4x4, e-locker, no sunroof. 2012 LTD with the normal options.
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