 D-Jet lean theories |
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| Morrie |
 Oct 1 2019, 04:33 PM
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#41
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Member  Group: Members Posts: 181 Joined: 8-October 07 From: Cedar Park, Texas Member No.: 8,198 Region Association: Southwest Region 
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QUOTE(ConeDodger @ Oct 1 2019, 05:27 PM)  QUOTE(ChrisFoley @ Jul 1 2019, 01:35 PM) QUOTE(914_teener @ Jul 1 2019, 10:48 AM) This needs to be investgated and checked or you will chase your tail. (IMG:style_emoticons/default/agree.gif) Cracked plenums can have a big effect on idle performance, when manifold vacuum is high and total air load is small. Shine a light through it in a darkened room. They also develop pinhole rust through. Smoke tested and no leaks. I think I am good there. (after replacement of all vacuum hoses and sealing a couple small leaks at fittings.) |
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| Morrie |
Oct 8 2019, 07:13 PM
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#42
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Member Group: Members Posts: 181 Joined: 8-October 07 From: Cedar Park, Texas Member No.: 8,198 Region Association: Southwest Region
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QUOTE(Morrie @ Oct 1 2019, 05:23 PM) QUOTE(ChrisFoley @ Oct 1 2019, 12:36 PM) My suggestion is to make an additional smaller adjustment in the same direction I made the first one. I backed the center screw out one full turn. Go another quarter turn and see if the engine seems to like it. Hey Chris, Thanks again for checking out the MPS and making it externally adjustable for me. There was an immediate improvement in how the engine runs, as you suspected. I'll give it another quarter turn and report back. Thanks again! The further adjustment made the engine come to life. My idle bypass screw now works as it should, my idle mixture screw on the ECU is now close to center. Next is to do some fine tuning with the LM1 and see where I end up. |
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