Re: AMM ? - Saab 900 Bulletin Board - Saabnet.com
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Re: AMM ?
Posted by JohnK (more from JohnK) on Fri, 28 Jan 2005 09:11:40
In Reply to: AMM ?, lms, Fri, 28 Jan 2005 08:33:14
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380 is not really stock, just a starting point, so Bentley is misleading. I would put the AMM back to where it was or hook up a digital voltmeter to the black O2 sensor wire and leave O2 sensor connected, just stick the probe into the connector and ground the other meter probe. Adjust AMM to get O2 sensor to fluctuate back and forth evenly around 0.5 volts and then tweak slightly in the direction that makes the reading on the high side to be a tad rich. You will be increasing AMM resistance to anywhere between 400 and 700 ohms. All depends on your individual car. Plugs wires, timing, ECU, fuel pump relays, FPR, injectors, AMM O2 sensor. The whole organism.
If you go too rich you will fail on CO and HC. However, you have more forgiveness on the rich side, since the Bosch system will run NOx through the roof once the mixture gets lean, but is more forgiving on HC and CO when the mixture goes rich.
A trick that has always worked for me is to retard the spark to 12-14 btdc prior to the emissions test. That usually will get the Nox to pass. Since it sounds like you're not too far over the Nox limit, I would try tweaking the timing rather than the AMM.
posted by 208.208.152...
Posts in this Thread:
- AMM ?, lms, Fri, 28 Jan 2005 08:33:14
- Re: AMM ?, JohnK, Fri, 28 Jan 2005 09:11:40 <-- Viewing This Message
- Re: AMM ?, lms, Fri, 28 Jan 2005 10:27:29
- Re: new CAT ?, kenS , Fri, 28 Jan 2005 11:12:14
- Re: new CAT ?, lms, Fri, 28 Jan 2005 12:29:23
- NOX?, eingang, Fri, 28 Jan 2005 14:46:44
- Re: NOX?, lms, Fri, 28 Jan 2005 16:43:39
- Re: NOX?, JohnK, Sat, 29 Jan 2005 07:04:06
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