Does anybody have their HC #'s that passed Echeck?
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Joined: Oct 2001
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From: Tampa, FL
Does anybody have their HC #'s that passed Echeck?
mine is 340, I dont know if my cars fine, or if Im running rich. I wanted to know what everyone else has ran, and if their vehicle is running rich. And what will running as rich as I am harm? I know over time carbon will build up but after how long? Thank god for ATF
HAILERS
Joined: May 2001
Posts: 20,563
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From: FORT WORTH, TEXAS,USA
My reply to this thread https://www.rx7club.com/forum/showth...threadid=46109 has the Hc and co for a 87 in January.
Really it's not meaningful just to compare HC numbers without knowing which test the car was subjected to.Here we have the ASM2525 test(slightly modified)ie 25%load at 25mph,no idle emissions are measured.
For what it's worth my 1999 test was 8ppmHC(with new Catco main cat).In 2001,same car,same cat,25000mile older,test result was 86ppmHC.
In any event CO is a better test of richness,HC is usually more indicative of poor ignition(although they tend to go up together when rich.
Also if your number is an idle number,on 86-88 cars the idle mixture,when correctly set,is rich in order to achieve a smooth idle.This is the reason that the O2 sensor does not go closed loop at idle(if it did the idle would be the pits).
I would not worry about an HC reading of 340ppm,but if my CO was greater than~0.2% I would start looking.
For what it's worth my 1999 test was 8ppmHC(with new Catco main cat).In 2001,same car,same cat,25000mile older,test result was 86ppmHC.
In any event CO is a better test of richness,HC is usually more indicative of poor ignition(although they tend to go up together when rich.
Also if your number is an idle number,on 86-88 cars the idle mixture,when correctly set,is rich in order to achieve a smooth idle.This is the reason that the O2 sensor does not go closed loop at idle(if it did the idle would be the pits).
I would not worry about an HC reading of 340ppm,but if my CO was greater than~0.2% I would start looking.
Rotary Enthusiast
Joined: Dec 2001
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From: Norwich, CT
Thread Starter
Senior Member
Joined: Oct 2001
Posts: 487
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From: Tampa, FL
hey
Originally posted by Six Rotors
Really it's not meaningful just to compare HC numbers without knowing which test the car was subjected to.Here we have the ASM2525 test(slightly modified)ie 25%load at 25mph,no idle emissions are measured.
For what it's worth my 1999 test was 8ppmHC(with new Catco main cat).In 2001,same car,same cat,25000mile older,test result was 86ppmHC.
In any event CO is a better test of richness,HC is usually more indicative of poor ignition(although they tend to go up together when rich.
Also if your number is an idle number,on 86-88 cars the idle mixture,when correctly set,is rich in order to achieve a smooth idle.This is the reason that the O2 sensor does not go closed loop at idle(if it did the idle would be the pits).
I would not worry about an HC reading of 340ppm,but if my CO was greater than~0.2% I would start looking.
Really it's not meaningful just to compare HC numbers without knowing which test the car was subjected to.Here we have the ASM2525 test(slightly modified)ie 25%load at 25mph,no idle emissions are measured.
For what it's worth my 1999 test was 8ppmHC(with new Catco main cat).In 2001,same car,same cat,25000mile older,test result was 86ppmHC.
In any event CO is a better test of richness,HC is usually more indicative of poor ignition(although they tend to go up together when rich.
Also if your number is an idle number,on 86-88 cars the idle mixture,when correctly set,is rich in order to achieve a smooth idle.This is the reason that the O2 sensor does not go closed loop at idle(if it did the idle would be the pits).
I would not worry about an HC reading of 340ppm,but if my CO was greater than~0.2% I would start looking.
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