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OP, something I have read will help with HC is a set of new plugs, even though the plugs in the car are not by any means worn out. Put in a new set of plugs, and new engine lube oil, less than 100 miles before the test.
I think your car could benefit from an "Italian tuneup" as well - get out on the freeway and run 80 for a while.
Uhhhh... NO. Have been using acetone in most of my cars for years, as mileage improving additive. Sorry, but I DO KNOW what I am talking about. And so on. Years, I said. NO issues. Running in my Camry Hybrid for over 2 yrs by now.
Spoken like a true garage chemist! Here is a science project for you; take some nitrile rubber o-rings (of which your fuel system contains many), place them in a GLASS dish of acetone, record results over the next few days... Report back!
Last edited by Lux Hauler; 07-22-2013 at 09:32 PM..
A bad EGR valve typically makes NOx too high. Cat for HC and CO. However your thermostat can have a big effect on HC and CO if it opens up too soon (too cold). Also adjust your timing if you can.
A bad EGR valve typically makes NOx too high. Cat for HC and CO. However your thermostat can have a big effect on HC and CO if it opens up too soon (too cold).
My dashboard temperature gauge never goes above 1/4 of its full range. It's been this way since I bought this car ('95 Corolla) 8 years ago.
I don't know if this is normal for this model, but if the temperature sensor is broken, can this have an effect on the HC levels?
Usually if the temp sensor is actually broken the temp gauge does not work. Very few factory installed water temp gauges have normal operating temp anywhere outside of 12:00, straight up or maybe straight to the right or left, occasionally straight down. But almost always 1/2 scale.
You can borrow (or break down and buy) an infrared thermometer, check the upper coolant hose.
High HC would be consistent with a failed water thermostat. This is a relatively easy fix, and the car will run better at the correct temp.
My dashboard temperature gauge never goes above 1/4 of its full range. It's been this way since I bought this car ('95 Corolla) 8 years ago.
I don't know if this is normal for this model, but if the temperature sensor is broken, can this have an effect on the HC levels?
I think you should research on 1/4 probably on Toyotanation. Most of the toyotas I have owned it's always closer to 1/2 mark.
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