Originally Posted by
freakshow__
Wondering if someone can tell me what my problem might be....
Engine is a P5XLT with 2 gallons of 20% on it. HSN is just barely out from flush, LSN is out 2 turns from fully IN.
After it gets up to temp and heat-soaked (approx 230 degrees).....
It runs fine but I get a pretty long 2-stage idle and when it drops down it wants to stall, so I have to kinda keep it running. By blipping the throttle though, it seems to idle up, then down, and generally erraticly. When the engine is colder (180 degrees approx) it runs fine and seems to idle better.
I have been all over the place with the LSN and idle screw and can't seem to get this to stop. It likes to load up at idle too so it smokes quite a bit if you let it sit for 10+ seconds, then take off, yet if I start to lean the LSN it will 2-stroke when I'm on the track....particularly after going wide open down the straight.
Any ideas from what I have described?
This could be several different things but lets start at the basics. How long have you been using the same glow plug and how much fuel have you burned through it? May need to change your plug. The settings you described on your needles are backwards. You should start with your LSN at flush and your HSN about 4 turns out. You need to set your idle screw at 1mm gap AND NEVER TOUCH IT AGAIN. This is a big mistake most people make when their tune gets outta whack and they think its an idle issue when its actually improper needle settings. Once idle is set you should never have to mess with it again. Always set your HSN first and then your LSN. If your idle hangs after a WOT run then your too lean on the HSN. If the idle comes down then goes back up its too lean on the LSN. With your needles set backwards the LSN is way too lean and the HSN is way too rich and is trying to compensate for the improper LSN setting. Also, what you're describing can be an air leak. Have you sealed the engine back plate and carb base? And check your fuel tank cap seal. If its not sealing properly you will get an erratic tune that cant be fixed without solving the air leak problem. Check all your lines and fuel tank.