# EMISSIONS **URL:** \ **Category:** SON240sx Automotive\ **Created:** [September 3, 2010, 2:13pm UTC](https://forums.speedlife.net/t/emissions/159934 "2010-09-03T14:13:43Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![MoNtAjNiK](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@MoNtAjNiK](https://forums.speedlife.net/u/MoNtAjNiK)\ **Post date:** [September 3, 2010, 2:13pm UTC](https://forums.speedlife.net/t/emissions/159934/1 "2010-09-03T14:13:43Z")
Hallo guys! Need your help ASAP, I hope someone has seen something like that before. I have yr 93 240 with the ka-de, went to emission test yesterday, and here is what it shows: ASM2525 TEST(when rolling 40 kph): HC ppm: 80 (limit is 64) CO% : 0.42 (limit is 0.35) NO ppm: 1543 (!!!wtf) (limit is 485) CURB IDLE TEST HC ppm: 198 (limit is 200) CO% : 0.36 (limit is 1.00) NO ppm: NA NA RPM 923 Dilution 15.0 Why is NO 1543, three times more than the limit? Perhaps someone did encounter situation like that, what would be the cause, and what do I fix? ---
**Author:** ![jzavalinsk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jzavalinsk/32/5713_2.png) [@jzavalinsk](https://forums.speedlife.net/u/jzavalinsk)\ **Post date:** [September 3, 2010, 2:18pm UTC](https://forums.speedlife.net/t/emissions/159934/2 "2010-09-03T14:18:07Z")
id say your cats pooched, how long has it been on the car? the no reading was like that on my old ford, changed the cat, passed. ---
**Author:** ![MoNtAjNiK](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@MoNtAjNiK](https://forums.speedlife.net/u/MoNtAjNiK)\ **Post date:** [September 3, 2010, 2:21pm UTC](https://forums.speedlife.net/t/emissions/159934/3 "2010-09-03T14:21:38Z")
Couldn’t that be egr problem as well? Cat definitely needs changing. It’s been on the car forever. ---
**Author:** ![89\_coupe](https://avatars.discourse-cdn.com/v4/letter/8/e0b2c6/32.png) [@89\_coupe](https://forums.speedlife.net/u/89_coupe)\ **Post date:** [September 3, 2010, 7:12pm UTC](https://forums.speedlife.net/t/emissions/159934/4 "2010-09-03T19:12:16Z")
yes it can be an egr problem. mine was double the limit because of my egr. but i bypassed the BPT valve and it passed ---
**Author:** ![MoNtAjNiK](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@MoNtAjNiK](https://forums.speedlife.net/u/MoNtAjNiK)\ **Post date:** [September 4, 2010, 4:58am UTC](https://forums.speedlife.net/t/emissions/159934/5 "2010-09-04T04:58:01Z")
What’s the BPT valve? How did you bypass? ---
**Author:** ![89\_coupe](https://avatars.discourse-cdn.com/v4/letter/8/e0b2c6/32.png) [@89\_coupe](https://forums.speedlife.net/u/89_coupe)\ **Post date:** [September 4, 2010, 9:47am UTC](https://forums.speedlife.net/t/emissions/159934/6 "2010-09-04T09:47:23Z")
the bpt valve monitors the exhaust pressure to activate a diaphragm that controls the EGR vacuum. im not to sure how we bypassed it. i had someone do it for me. maybe someone else on here knows what to do. but it will bring you HC up a little ---
**Author:** ![MoNtAjNiK](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@MoNtAjNiK](https://forums.speedlife.net/u/MoNtAjNiK)\ **Post date:** [September 8, 2010, 9:57pm UTC](https://forums.speedlife.net/t/emissions/159934/7 "2010-09-08T21:57:11Z")
The thing is that the exhaust gas return pipe cracked, and is now blocked. How about if I partially block the exhaust pipe, leave a hole, say, only 1/2 inch in diameter, this as well should reduce the burning temperature in the cylinders, and lessen NOx emissoins. What do you think? ---
**Author:** ![derass](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/derass/32/5691_2.png) [@derass](https://forums.speedlife.net/u/derass)\ **Post date:** [September 10, 2010, 12:09am UTC](https://forums.speedlife.net/t/emissions/159934/8 "2010-09-10T00:09:22Z")
if you try to restrict (plug) the exhaust it will still fail. change your cat and you’ll be good. i remember when i replaced the cat on my vr6 swap and it still had high NO emissions. the tech said it was because they threw the car on the tester without much of a warm up. the cat works best when it is hot like after a hard drive ---
**Author:** ![MoNtAjNiK](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@MoNtAjNiK](https://forums.speedlife.net/u/MoNtAjNiK)\ **Post date:** [September 13, 2010, 6:34am UTC](https://forums.speedlife.net/t/emissions/159934/9 "2010-09-13T06:34:18Z")
Yep, that’s what I think I gonna do…