I have 71 spit, mark IV. I recently changed the fuel pump because it appeared to have blown a diaphragm (gas was spraying out of the weep hole). Since the change the car has not performed correctly. At first the car would crank, but would not maintain idle. During this failure mode, I noticed that the car?s idle would degrade (it would move from 1000 rpms to 800, 600, 400 and stop) in a time frame of about 4 seconds. I changed the oil thinking the gas draining in the fuel pump had weakened the viscosity of the oil in the crankcase. I started the car and the same failure mode was present. I also noticed that the carburetor (Stromberg 150 CDSE) was leaking gas from around the choke area. This led me to believe that the float was stuck. I removed the carb and removed the float chamber cover to look for debris and other possible causes. I could not find any culprits. The float appeared to be working as designed and it did not have any gas in it. I did notice that the needle valve in the float chamber was clean but the piston actuated by the float assembly seemed to be a sticking. I reassembled the carb and attached it to the car. The leak went away but the car still would not maintain idle. I adjusted the throttle speed screw to achieve idle. This improved the situation, but the car was not running as well as it was before the fuel pump failure. Since then I have removed the carb several times and disassembled the top and bottom looking for potential root causes to the problem. I have not found anything that could be the cause. The car acts like it?s running rich and then it will act like it is running lean. I have reviewed the new fuel pump to ensure that it is performing correctly. I was wondering if I have missed something obvious or have forgotten a detail in my haste to ?fix? the carb? I am not convinced that the needle valve is working correctly. I am planning to test tonight with lung- power (push the piston up and blow through the fuel hose). How can I determine if the carb has a biased needle or unbiased needle set up?
I have checked some of the major stuff: the distributor is not loose (timing should be the same); spark plugs are in and the wire are connected; the car has plenty of gas; all coil wires are connected, etc. Any help would greatly be appreciated. Thank you, Danny /// [EMAIL PROTECTED] mailing list /// Send admin requests to [EMAIL PROTECTED] /// or try http://www.team.net/cgi-bin/majorcool /// Archives at http://www.team.net/archive /// Send list postings to [EMAIL PROTECTED] /// Edit your replies! If they include this trailer, they will NOT be sent.
