chargermll
Well-Known Member
I'll try to explain this the best I can. For the past couple of months I have been getting my 72 Charger back together. I have a 950 QF carb on my stroked 440. This is a brand new carb that I put on my brand new engine. I did the general tune and fired the engine up. The only issue I had with this carb was that it was rich at idle. I played with the IFR's and IAB's to try to fix that issue. It got better but not perfect. I decided to try a smaller IFR. Did that, put the carb back on and now I can't get it to idle. Took carb off, put back to previous set up. Still having same issue. I double checked that my transfer slots were "squared" on both the primary and secondary. Double checked float levels. Both in the middle of site glass. I cleaned everything with carb cleaner and blew out the passages with compressed air. My timing is at 25 degrees initial. Changing timing has very little effect. The engine starts fairly easy and I can keep it running if I keep my foot on the pedal but its rough and dies as soon as I let off. I discovered that I can get it to idle( but very poor) if I pull the pcv hose off and create a vacuum leak. What I found out after doing this was that if I turn the idle mixture screws in the completely on the primary it has no effect, engine keeps running. If I turn the screws in on the secondarys then the engine shuts off like it should. So I'm thinking some how gas is leaking into the primary. I tried cleaning the primary's again. No change. I have an electric fuel pump. I have it set at 6 psi according to the gauge. I dropped it down to 4 psi and still no change. At this point I'm out of ideas. I'm sure this is something simple that I am just missing. I'm open to any ideas. Thank you