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I had exact same problem but I have opinions
Posted by dave n (more from dave n) on Wed, 13 Jun 2001 16:48:22
In Reply to: Re: LH2.2 Cold Start Idle Hunt SOLVED!!, Kevin K
[Profile/Gallery]
, Wed, 13 Jun 2001 12:27:09
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I solved my rough idle by adjusting my amm screw. That tells me the amm is used from the time the car is started. The rough idle started right after I lowered the fuel pressure 5 psi. I even replaced the NTC sensor! Then I remembered that changing fuel pressure leans out the startup mixture, since o2 sensor doesn't compensate for it for awhile. SO I turned amm screw until I got proper 02 gage fluctuations which turned out to be 3.5 turns CW. Believe me, the very next morning it started idling smooth as silk again. I agree that putting a resistor in series with the NTC works.. Only it does the exact same thing adjusting the amm screw CW does: enrich the mixture. What you really need is a variable resistor in series with NTC that goes up in value with boost! Kind of like the boost transducer..
dave n
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