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I took the car through Virginia emission inspection and failed. the motor was recently rebuilt with new rings, rod and main bearings.. valve job etc... Something is terribly wrong as the (HC pm) hydrocarbon at the tailpipe at 15mph on the rollers had a limit of 119 and the car read 201. At 25 mph the limit was 115 and the car read 170. The (NO pm) ......, not sure what it is at 15 mph had a limit of 945 and the car read 4959 and at 25 mph had a limit of 855 but the car read 4839.... Does anyone know what the problem may be? Any help will be appreciated.. Thanks guys
The motor is a stock usdm motor... Modifications include headers, intake and a thermal research exhaust system. All the emission stuff is on the car. The
Yeah im having the same problem except the only thing i have is an intake. My HC count was like 251 or some crazy sh*t like that. I hope its not my CatCo Hi-Flow Cat...
when was the last time you did a tune up? how old is the cat? could you post all of the exhaust gas #'s from the test to give you a hand
The plugs and oil were changed about 2k ago but thats about it... I have not had the car that long.... Its beel only 6 months i bought the car with the cat on it but it looks pretty rusted on the outside.... You think that may be my problem? I left the test results at work so i will post the numbers tomorrow.... Thanks in advance....
if you have both High NOx and High HC's at the same time its usually the cat.
If you have just one or the other, the go search and destroy on some vacuum leaks. If you dont have any then play with the timing especially since you said that you just had that motor rebuilt.
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Hmm yeah Ive got some bad misfire. My timing is at 15*, replaced my sh*tty autolites with NGK Bk6re VPOWAH plugs , NGK wires, cap and rotor. Still the samn thing misfires.
If the ECU was reset lately (maybe with all the engine work?) it will need about 300 to 500 miles to "learn" all over again before it adjusts everything right for emissions.
if you have both High NOx and High HC's at the same time its usually the cat.
If you have just one or the other, the go search and destroy on some vacuum leaks. If you dont have any then play with the timing especially since you said that you just had that motor rebuilt.
You were partially right... It turns out that the cat was not working like it should but the egr tube was also blocked.... I cleared the blockage and replaced the cat... It passed the emissions inspections.... Thanks
If the ECU was reset lately (maybe with all the engine work?) it will need about 300 to 500 miles to "learn" all over again before it adjusts everything right for emissions.
