You could be right... doesn't smell like rotten eggs. I am pretty sure it is the original because I have most of the service slips on the car and never came across a cat replacement. I have the down pipe off of it (doing some exhaust manifold work) and will check the cat to see if it is hollow.
> -----Original Message----- > From: Chad Sullivan [mailto:[EMAIL PROTECTED]] > Sent: Monday, July 01, 2002 7:06 PM > To: Ryan; CRX (E-mail) > Subject: Re: ZC running rich - many questions > > > If it was running as rich as you seem to be worried about, you're NOx > wouldn't be that high. Both values high would make me > believe it was a bad > cat and nothing more complicated than that. And a years time > is more than > time enough to finish off a cat, it either has catalyst left > or it doesn't, > there isn't really a "last leg" condition for a cat. I'm > actually kind of > shocked it lasted for 200k miles. Does your exhaust stink? > Like a rotten > egg smell? another bad cat symptom. You could always borrow > a buddies cat > for a day just to see if that is indeed the culprit. > > > -Chad Sullivan > > > ----- Original Message ----- > From: "Ryan" <[EMAIL PROTECTED]> > To: "CRX (E-mail)" <[EMAIL PROTECTED]> > Sent: Monday, July 01, 2002 8:50 AM > Subject: CRX: ZC running rich - many questions > > > > I need help cleaning up the emissions on my ZC motor > (standard ZC 1989 > > vintage). I went to have my yearly state emission test > with the new ZC > > motor and it failed on the Hydrocarbons. > > The readings for the 2500 RPM test were 67 ppm (220 > allowable) and 363 ppm > > at idle (220 allowable). The NOx was pretty high also but > they weren't > > required to test that part. > > When I put the engine in a few months ago I did all the > normal replacement > > of tune up parts - Spark plugs, spark plug wires, > distributor cap & rotor, > > and ran a bottle of SI1 fuel injection cleaner through it. > > The guy at the testing center was kind enough to test it in > manual mode to > > see what kind of HC it was putting out at different RPMs. > When he let off > > the gas the HC count went way up to 1000. He said it was > probably the > > Catalytic converter and although I somewhat agree with him > on that, it > > doesn't explain how the HC count was so low in the previous > years tests. > > Last year it was 78 at idle and the year before it was 68. > I think the > cat > > is the original with 200K miles on it, but if it was in > about the same > shape > > the year before why did it run so clean? > > I have also checked the timing and both cams are aligned > where they should > > be in relation to the crank. I was thinking of getting an > AEM adjustable > > cam gear and taking it to the dyno and see if I can dial > out some of the > HC. > > Is it possible there is too much overlap in the exhaust > cam? I also have > 3 > > different computers I can try in the car, an SI, a 88 > Integra, and the ZC > > one which is the one I have been running. > > I think by just sticking on the cat it will probably clean > it up enough, > but > > should the motor really run that rich? > > > > Ryan > > Cumming, GA > > >
