seeleylaker
New member
'79 L82, 4 speed, stock, 25K original miles
Had a problem with misfiring when the secondaries opened. Adjusted secondary metering rods with help from Lars paper. Problem not solved, but way better. Engine also ran rough at low speed when hot and seemed to be loaded up.
Pulled the carb today and rechecked the secondary rods. Set the float level in accordance with Lars paper. Checked the measurements on the power piston.
What I found:
-The lead-in tip on both main metering rods was slightly bent (like it was so far out of the jet bore it was hitting the jet on the way down)
-The adjustment was bottomed out and the measurement was still off almost 3/16
-Visual inspection of the tower showed the arms weren't bent anywhere close to the same angle
-Bent the arms straight, remeasured, not much change
-Read Lars paper closely and set the top of the power piston about .020 above the plastic collar
-Made what I thought was a logical decision and then bent the arms to produce the correct measurement on both rods. Looking down at the rods in the jets looked much better at this point
The problem:
-Motor started right up but is making what I think are little backfires out both sides. Not big ones, but fairly fast and "crackling"
-Can't get motor to idle less than 1200 rpm (screw not touching the stop)
-This carb has no idle adjustment screws (their position in the casting is filled with a very factory looking metal plug)
-The car is in my shop so it is hard to see smoke because of the lighting. It smells bad and shining a flashlight across the pipes shows what looks like black smoke from both pipes
Any and all ideas appreciated-would like to put the car in a local parade this weekend. Am afraid to at this point.
Jim
Had a problem with misfiring when the secondaries opened. Adjusted secondary metering rods with help from Lars paper. Problem not solved, but way better. Engine also ran rough at low speed when hot and seemed to be loaded up.
Pulled the carb today and rechecked the secondary rods. Set the float level in accordance with Lars paper. Checked the measurements on the power piston.
What I found:
-The lead-in tip on both main metering rods was slightly bent (like it was so far out of the jet bore it was hitting the jet on the way down)
-The adjustment was bottomed out and the measurement was still off almost 3/16
-Visual inspection of the tower showed the arms weren't bent anywhere close to the same angle
-Bent the arms straight, remeasured, not much change
-Read Lars paper closely and set the top of the power piston about .020 above the plastic collar
-Made what I thought was a logical decision and then bent the arms to produce the correct measurement on both rods. Looking down at the rods in the jets looked much better at this point
The problem:
-Motor started right up but is making what I think are little backfires out both sides. Not big ones, but fairly fast and "crackling"
-Can't get motor to idle less than 1200 rpm (screw not touching the stop)
-This carb has no idle adjustment screws (their position in the casting is filled with a very factory looking metal plug)
-The car is in my shop so it is hard to see smoke because of the lighting. It smells bad and shining a flashlight across the pipes shows what looks like black smoke from both pipes
Any and all ideas appreciated-would like to put the car in a local parade this weekend. Am afraid to at this point.
Jim
