Quote:
Originally Posted by MB140300SD
Today I reinstalled the Monarch 314s and set them all to right at 1950. The results were drastic and immediate. It has returned to a nice quiet idle. I do still appear to have the stumbling when returning to idle. This seems to happen with the AC off, but does not do it when AC is on. I had an issue where at certain temps with AC off it will miss when its in park. Does not miss in gear or with AC on. I am getting a lot if bubbles in the line out of the bottom of the pre filter, as well as some bubbles out of the fuel heater. I am guessing perhaps this might be causing that. All of the plastic lines have been replaced semi recently and I just replaced the shut off valve and o ring. I am thinking about figuring out what size all the o rings are, pulling the plastic lines and replacing the o rings with new viton rings. Perhaps that will cure the bubbles and the stumble. Does not have any hesitation or stumbling on full throttle.
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Return to idle could be associated with base idle setting. The electronic system can do a lot, but it has a latency. SoId I’d look into how you adjust the IP for the return to idle. I’d also look if any cruise control linkages are binding up. Btdt. Granted a 99 has more throttle by wire than the older cars, but you need to look at the IP and determine what adjustments may be viable.
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