Inconsistent startup on street ported 12A

dr.occa · 03-07-2012, 09:40 PM

Pulled the plugs and spun the motor until it was spitting clean (ok, cleaner).

I found that the trailing plugs were covered in oil and fuel. Upon testing them only one (the plug wire to the front housing trailing) was sparking (very feint) and erratically while the other wasn't sparking at all. I thought it may just be the plugs. I plugged them up to the lead plug wires and they came to life. I confirmed by testing the lead plugs again in their home wires and then on the trailing wires. The same thing occurred with the lead plugs as with the trail plugs on the trailing wires. As soon as I replaced the cap and rotor - BANG! Houston we've got lift off!

THEN, I found that just with the fuel pump going before the car even starts, the pressure on the gauge shoots up to 6 psi! I'm using a Carter 4070 and Holley low press. fpr and 3/8 from tank to pump to fpr and carb (6AN). Looking down the carb I'm also seeing the pump jets dripping (rapidly - more like dribbling) onto the throttle plates. So I'm discovering that it's flooding badly!

I was able to drive it down the street a few hundred yards but when I did an about face it puttered out.

I'll need to inspect the accelerator pump assembly and play (hopefully there's no play) and hopefully a rebuild and float adjustment will fix it.

03-07-2012, 09:40 PM	#8
dr.occa Rotary Fan in Training Join Date: Mar 2011 Posts: 73 Rep Power: 15	Pulled the plugs and spun the motor until it was spitting clean (ok, cleaner). I found that the trailing plugs were covered in oil and fuel. Upon testing them only one (the plug wire to the front housing trailing) was sparking (very feint) and erratically while the other wasn't sparking at all. I thought it may just be the plugs. I plugged them up to the lead plug wires and they came to life. I confirmed by testing the lead plugs again in their home wires and then on the trailing wires. The same thing occurred with the lead plugs as with the trail plugs on the trailing wires. As soon as I replaced the cap and rotor - BANG! Houston we've got lift off! THEN, I found that just with the fuel pump going before the car even starts, the pressure on the gauge shoots up to 6 psi! I'm using a Carter 4070 and Holley low press. fpr and 3/8 from tank to pump to fpr and carb (6AN). Looking down the carb I'm also seeing the pump jets dripping (rapidly - more like dribbling) onto the throttle plates. So I'm discovering that it's flooding badly! I was able to drive it down the street a few hundred yards but when I did an about face it puttered out. I'll need to inspect the accelerator pump assembly and play (hopefully there's no play) and hopefully a rebuild and float adjustment will fix it.