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post #1 of 7 (permalink) Old Oct 1st, 03, 05:09 PM Thread Starter
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i have a 88 iroc camaro with a stock 350.it passed everything except for excessive NOx.what would cause my car to do that.please give me some clues.
thanks billy

69 rs/z28 <br />711 72 72<br />12c x33
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post #2 of 7 (permalink) Old Oct 1st, 03, 06:18 PM
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A malfunctioning/disconnected EGR valve would result in high NOX.
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post #3 of 7 (permalink) Old Oct 3rd, 03, 12:38 PM
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NOx is a lean mixture condition.

-dnult

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #4 of 7 (permalink) Old Oct 3rd, 03, 04:46 PM
 
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also make sure your timing is not advanced over stock. it can cause high NOx, as can a worn out converter.
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post #5 of 7 (permalink) Old Oct 3rd, 03, 04:50 PM
 
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also make sure your timing is not advanced over stock. it can cause high NOx, as can a worn out converter.
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post #6 of 7 (permalink) Old Oct 3rd, 03, 09:46 PM
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Quote:
Originally posted by dnult:
NOx is a lean mixture condition.

-dnult
sorta... a lean mix will increase combustion temps...

NOx is caused by high combustion temps...

the EGR system is intended to reduce combustion temps...

and an ORC cat helps control NOx...

can you post the results of all the gasses from the test??? as well as the RPM they occured??? or is it a chassis dyno test???

68 camaro... your tipical hipo 350... stl crnk... h beam rods full floating pistons mild cam, auto trans (wanting 700r4)... gears 3.73's... smokes tires lots of fun... also 87 IROC 305TPI 5-speed
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post #7 of 7 (permalink) Old Oct 4th, 03, 04:38 PM Thread Starter
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hey i bought the car with the speedo-cable broken and it would pull up code 24 v.s.s.i fixed the speedo cable.i read the v.s.s. helps activate the e.g.r.so do you think this might be the problem with my high HOx???????
thanks for the replies!

69 rs/z28 <br />711 72 72<br />12c x33
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