Need some help please

Reply #15 – June 16, 2014, 09:27:30 PM

An idle test is the hardest. An idle 1500 and 2500 non dyne is the hardest of the stationary tests because the EGR does not work on some cars unless it is moving. So NOX might be an issue as we have dun many tests and they are different. Example 1995 and lower is required to pass an ASM25-25 . BUT the state dyne does not have twin rollers. So any full time 4 wheel drive vehicle not OBD2 1995 and older can not be spun on the state dyne. So a idle 1500 2500 is used. All obd2 cars are just scanned for set monitors codes and SES light operation. The ASM 25-25, test is easy as the vehicle is run on a dyne @ a steady 25 MPH and sampled. This test is the easiest. Some states have full blown IM240 and that is the test that will fail just about every car on this forum that is not completely stock down to every nut and bolt with absolutely no engine wear or issues. So when people say emission control devices have been removed and still pass a tail pipe that is subject to the test at hand. other than OBD2. Have a good evening guys

Need some help please

Reply #16 – June 17, 2014, 12:49:59 AM

Also depends on the nox levels of the city/county/ state.

some places in california allow 450 nox before failing, where my county is limited to 220.

Our test they do an idle test for 30 seconds, 1500rpm for a minute and then another minute idle. if it ever exceeds 220 ppm on nox you fail. same procedure with the 2500rpm test.

I still beleive that test to be much easier then the roller test we used to have. once i figured out my cougar was so far advanced and dropped it down, i hit 76ppm on nox for 1500rpm's and 75 ppm for 2500rpm's i beleive.

cougar is the first car I've had where everything actually works the way it should. all emissions are in tact and functioning properly on it.

Need some help please

Reply #17 – June 17, 2014, 05:43:56 AM

Stacks the emission numbers are set up by the FEDS then the states can make them easier when adopting emission regs. (Other than OBD2) And they can pick the way the vehicle is tested. Like i said . The feds use an IM 240. That is why people remove emission devices and pass local tests. It is different for every car as to it"s transmission axle ratio engine option and weight of the vehicle ETC. Example a 3.8 Cougar compared to lets say a 5.0. And a 2.73 compared to a 3.73 final drive. And every year is different. Example years back i had a Pontiac 9 passenger wagon when the kids were small. It had a GVW of 6800 LBS. That car had to pass phase 2 emissions which allowed my numbers to be higher than one that is under 6000 GVW., Like i said every car and year is different. Bottom line hear is the states can and do reduce the numbers lower to an unreasonable number to meet as designed but normally do not use an IM240 standard. It is a scam and there is nothing we can do about it because every car was designed to meet IM240 when built. But at least OBD2 cars do not have to go on the DYNE. That is in my state i do not know about other states. So if you are correct in your statement different areas even in the same state can make you life miserable depending on there emission numbers. But basically an ASM 25-25 is the easiest test to pass. Also you said they time the test at idle. That makes no sense as to why. Normally an idle tailpipe test does not change and does nothing to see if the car is clean. As far as i know no state does an idle only test. Not 100% on this but that test is useless. Have a great Tuesday guys

Best example i specialize in Cosworth Vegas and have a big following. That car from the factory idles @ 1600 RPM'S. It fails every Emission test for high idle specks. In CT we had to meet with the law makers to exempt the car for non compliance on excessive idle speed. This happened in transition when ct first started tasil piping and went to as you come tailpipe test. So in CT idle speed on certain cars were exempt for excessive as designed. So there fore an engine pollutes much less when it runs faster. Not all the time but most of the time under 1500 RPM'S hope this explains it.

Stacks if you are talking NOX a roller test is is much better because the EGR does not work at idle!!! And normally most cars block EGR when not rolling in gear. Another words when the ECM does not see VSS it blocks the EGR from opening and the NOX goes HIGH. If you know lets say Tuebo coupes you know the EGR solenoid is on the passenger side firewall under the right front fender along with the over-boost sensor. It blocks vacuum to the EGR unless the ECM sees a VSS signal. Just an example.