CrankShaftKid Posted June 7, 2008 Share Posted June 7, 2008 Having a hell of a time getting my emissions to pass inspection. First time I took it in, failed. Realized the PO took the dam the cat off. Okay so I take it in and get a cat installed. Took it in today, hydrocarbons are good, but Nox is way high. Actually 4 times higher than pre cat, which really doesnt make sense. Assuming the guy didnt screw up the second time and I do in fact need to get Nox down, where should I start? Thanks guys Link to comment Share on other sites More sharing options...
87ComancheLB Posted June 7, 2008 Share Posted June 7, 2008 O2 sensor my guess. Link to comment Share on other sites More sharing options...
my87manche Posted June 9, 2008 Share Posted June 9, 2008 check EGR. nox caused by excessive combustion temps. EGR sends exhaust gases in to lower temps and nox. Link to comment Share on other sites More sharing options...
CrankShaftKid Posted June 9, 2008 Author Share Posted June 9, 2008 Thanks guys, changed the EGR and 02 and am now compliant. Throttle response is much more lively as well. Link to comment Share on other sites More sharing options...
FxRacing282 Posted June 10, 2008 Share Posted June 10, 2008 also when you go to test your engine you want it real hot and whatnot. when the engine is just slowly driven to the garage it has less of a chance of failing. but it looks like you are all set Link to comment Share on other sites More sharing options...
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