 Help emissions failure, bah! fail HC at idle |
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| TravisNeff |
 Apr 14 2005, 01:35 PM
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#1
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914 Guru  Group: Members Posts: 5,082 Joined: 20-March 03 From: Mesa, AZ Member No.: 447 Region Association: Southwest Region 
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Well, I tuned up the 914 (72 1.7) and drove the hell out of it before my emissions test. It failed HC at idle, here's the results:
HC Loaded Reading: 123 PASS Loaded Standard: 400 Idle Reading: 431 FAIL Idle Standard: 400 CO Loaded Reading: 0.27 PASS Loaded Standard: 4.2 Idle Reading: 0.30 PASS Idle Standard: 5.50 I set the ECU all the way counter clockwise and adjusted my idle to around 1100 for the test. Maybe I set this the wrong way? I set it per Brad Anders' webpage suggests. Or maybe TPS? Since I passed so well on the others, I don't want to undo what I did right for my idle test. Could be a vacuum leak I have a 200-300 rpm hunt - hoses check out so I am left with plenum gaskets, cold start gaskets or a cracked plenum. Gimme some ideas! |
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| phantom914 |
Apr 14 2005, 01:42 PM
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non-914-owner non-club member Group: Benefactors Posts: 1,013 Joined: 24-February 04 From: Covina,CA(North ofWest Covina) Member No.: 1,708  |
HC is unburned fuel. If you lean it out too much you can have misfires which will dump raw fuel. Judging by the CO readings, you can afford to richen the idle a bit if that helps you have a smoother idle (less misfiring). The ECU knob only affects idle so it won't mess up the loaded readings.
I have also seen the suggestion in the past to set the idle speed on the high end of the acceptable range. Andrew |
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Posts in this topic
Travis Neff Help emissions failure Apr 14 2005, 01:35 PM
Aaron Cox you have to smog a 72? http://www.... Apr 14 2005, 01:37 PM Travis Neff Yeah, have to test back to 1967 here in metro Phoe... Apr 14 2005, 01:44 PM Aaron Cox unburned fuel...
get a CD ignition http://ww... Apr 14 2005, 07:10 PM jim_hoyland When my '75 was last smogged it would always p... Apr 14 2005, 07:32 PM Travis Neff All happy after her report card... Just need to w... Apr 14 2005, 07:32 PM jasons Hey Travis, did you have to sit in the car and shi... Apr 14 2005, 10:09 PM
Travis Neff Thanks Jason.
I sat in the passenger seat and had... Apr 15 2005, 10:29 AM |
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