The TTZ Failed smog for NOx readings

The Nissan 300ZX (Z32) general community discussion forum
djtoasty
Posts: 9
Joined: Sun Dec 16, 2012 4:51 am
Car: 1991 Nissan 300zx Twin Turbo

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So after some diagnosing I found the root casue of my car failing smog for NOx readings. I hooked up an Ignition scope to see the firing patterns and was actualy shocked of what I found. Seems like my Injectors are not putting out the right amount of fuel. I dont want to try to change them yet. Has anyone done SeaFoam On the TT'S? I know how it works and how to use it, but is it safe for turbo cars, never tried it on them.


nissanfreak12
Posts: 1709
Joined: Sun Jan 23, 2011 4:07 pm
Car: 92 300zx 2+2 TT
Location: Denver, CO

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Try BG44K, that stuff works a lot better than seafoam, little more pricey and you can really only get it at NAPA. About $20 can, used it in the Jeep once, definitely noticed a difference.

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DCaff300ZX
Posts: 4202
Joined: Sun Jun 14, 2009 8:18 am
Car: .
1993 CRP TT- Modified
Location: Tacoma, Washington

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I also like Lucas upper cylinder lubricant in the tank, as it definitely helps the injectors operate better and improves fuel mileage and how smooth the engine runs.
It may or may not help emissions, but it does help the injectors a lot.

djtoasty
Posts: 9
Joined: Sun Dec 16, 2012 4:51 am
Car: 1991 Nissan 300zx Twin Turbo

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DCaff300ZX wrote:I also like Lucas upper cylinder lubricant in the tank, as it definitely helps the injectors operate better and improves fuel mileage and how smooth the engine runs.
It may or may not help emissions, but it does help the injectors a lot.
Sometimes it can... espically for NOx readings, if you have lean Injectors, that causes higher cylinder temperatures which creates NOx emissions. My fail isnt too far off so I believe that it may work... Well see, Im also going to use chevron because the techron additive is the best out there.


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