Braden Posted September 30, 2009 Report Share Posted September 30, 2009 hey guys i have an l20b running a stock rebuilt hitachi, i just finished the rebuild and i also swapped from heat riser intake/exhaust to non heat riser, all of the egr has been removed and im having a little bit of tuning trouble. when the truck is warm i can get it to idle smooth, but when i drive it and i come to a stop sometimes it idles and sometimes it will idle down then quit, its quite annoying and i was wondering if any of you had any tips, i know one guy on here was saying something about the idle and mix screws, tinkering with them both in a certian way but i couldnt make sense of what he was saying, i have set my mix screw to 2-2.5 turns initially and set my idle screw, thanks Quote Link to comment
Braden Posted October 1, 2009 Author Report Share Posted October 1, 2009 BUMP!!!! this is a daily driver guys!!! Quote Link to comment
]2eDeYe Posted October 1, 2009 Report Share Posted October 1, 2009 Check for vacum leaks? Check your choke adjustment. Mixture adjustment: With the engine running turn in the mixture screw until the rpms drop. Then turn the screw out 1/4 turn. Then adjust your idle. Quote Link to comment
datzenmike Posted October 1, 2009 Report Share Posted October 1, 2009 Here's what I do. Warm the engine up. Turn the mixture screw in till idle starts to stumble then turn out untill it stumbles. Select a point 1/2 way between. Adjust idle speed screw up or down. Repeat as many times as needed to get the idle smooth and around 650-750. You may have trouble with idle to start, so turn the idle speed up a bit. Be sure the valve lash is set properly and the timing is set or this is a waste of time. Quote Link to comment
Braden Posted October 2, 2009 Author Report Share Posted October 2, 2009 Here's what I do. Warm the engine up. Turn the mixture screw in till idle starts to stumble then turn out untill it stumbles. Select a point 1/2 way between. Adjust idle speed screw up or down. Repeat as many times as needed to get the idle smooth and around 650-750. You may have trouble with idle to start, so turn the idle speed up a bit. Be sure the valve lash is set properly and the timing is set or this is a waste of time. thanks mike, will do, and as far as vacumm leaks i am proud to saY I have none!!!! I SPENT 2 days swapping out my intake and exhaust manifold for the non heat riser version and i replace the intake exhaust gasket, i also got rid off alll of the egr stuff, its alot nicer under the hood and leake free, i will tune up some more tomorrow and get back to you Quote Link to comment
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