Quick emissions question
#17
Lexus Test Driver
iTrader: (20)
Do you have a vacuum pump? You can tests these components by applying vacuum.
Apply Vacuum to the EGR valve, if your engine stumbles than the EGR valve is good.
To check the modulator to see if it gives the vacuum to the EGR valve. Pull the vacuum line off the EGR valve that goes to the Modulator. Rev engine, if the needle on the vacuum gauge moves the modualtor is good. If the needle doesnt move, most likey you have a bad modulator.
I would replace the modulator with a new one, I dont see cleaning it would help.
You know I just realized that you had the V8. It also can be your O2 sensors, if you have a lean condition NOx will elevate.
The cars that I see fail are the 4 cylinders and the V6s, the common problem is the EGR modulator
Apply Vacuum to the EGR valve, if your engine stumbles than the EGR valve is good.
To check the modulator to see if it gives the vacuum to the EGR valve. Pull the vacuum line off the EGR valve that goes to the Modulator. Rev engine, if the needle on the vacuum gauge moves the modualtor is good. If the needle doesnt move, most likey you have a bad modulator.
I would replace the modulator with a new one, I dont see cleaning it would help.
You know I just realized that you had the V8. It also can be your O2 sensors, if you have a lean condition NOx will elevate.
The cars that I see fail are the 4 cylinders and the V6s, the common problem is the EGR modulator
#18
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Join Date: Aug 2010
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Do you have a vacuum pump? You can tests these components by applying vacuum.
Apply Vacuum to the EGR valve, if your engine stumbles than the EGR valve is good.
To check the modulator to see if it gives the vacuum to the EGR valve. Pull the vacuum line off the EGR valve that goes to the Modulator. Rev engine, if the needle on the vacuum gauge moves the modualtor is good. If the needle doesnt move, most likey you have a bad modulator.
Apply Vacuum to the EGR valve, if your engine stumbles than the EGR valve is good.
To check the modulator to see if it gives the vacuum to the EGR valve. Pull the vacuum line off the EGR valve that goes to the Modulator. Rev engine, if the needle on the vacuum gauge moves the modualtor is good. If the needle doesnt move, most likey you have a bad modulator.
#19
Good luck with this issue, you've seen my thread and I am leaning now fully towards the o2 sensors being my problem.
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