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First smog test on my 99. Passed, but... (long)
Posted by Pat Hurley [Email] (more from Pat Hurley) on Mon, 1 Sep 2003 00:37:49
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2.3 LPT, 63,000 miles.
Was reading the results, and noticed that in one of the tests, the hydrocarbons (HC) part of the test was high (still under the limit,but just barely). The rest were above average, but not right at the limit like HC was.
At 15 MPH (this is the "on the dyno" test), HC reading was 49 PPM, and the limit is 51 PPM. The average reading (I assume they average by model year, or california emissions category -- like LEV, ULEV, etc.) is 9.
Up at 25 MPH , They dropped a bit -- 16 PPM, compared to a max reading of 35 PPM, and an average of 7.
I'm not sweating this big time, but that high HC reading worries me a bit. I've often noticed that the exhaust does smell like it's a really rich mixture, and wondered if something wasn't quite right.
I've had tons of vacuum leaks over the years, but just had one hose replaced less than a week before the test, and don't think i have any other active leaks.
So, I guess I should turn this into a question, rather than just an observation :
Any thoughts on what would cause these high HC readings? I assume that vacuum leaks can cause issues here...but I'm also wondering if there are other things that might be causing this..... deposits in the intake system, etc. ????
I've had some "driveability issues" with this car (pinging, surging at low speeds, etc.) for quite some time, and no one (dealer, indy, etc.) has really been able to do much about it.
Perhaps I'm making too much out of this (it DID pass)...
Thanks
posted by 66.75.15...
Posts in this Thread:
- First smog test on my 99. Passed, but... (long), Pat Hurley, Mon, 1 Sep 2003 00:37:49 <-- Viewing This Message
- Consider the Cat converter..., Al S, Mon, 1 Sep 2003 13:30:21
- Re: First smog test on my 99. Passed, but... (long), Jason 0W-40, Mon, 1 Sep 2003 04:44:58
- Do techron every 3k, plugs only 3k old, Pat Hurley, Mon, 1 Sep 2003 12:11:18
- Re: First smog test on my 99. Passed, but... (long), TG, Mon, 1 Sep 2003 09:57:11
- Re: First smog test on my 99. Passed, but... (long), Dean, Mon, 1 Sep 2003 07:39:59
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