Think I May Have Found Out Why My 340 Seemed to Idle Rough...
Hey Folks,
My 340 has forged crank/rods internally balanced, and has idled rough while idling in gear since the day I bought it. Not just a cam with lots of overlap rough, but like a non-firing cylinder type of rough. Did all the basic troubleshooting. Compression test, wires, checked for vacuum leak, etc. all cylinders were firing. But it ran well overall. Weird...?
As some of you may know, the Duster's been out of action while I perform some much needed (and long put off)repairs. One of which being replacing the seals on the 727, i.e. front pump seal, bushing, shifter pivot seals, replace the converter etc. The car is a 4 speed car that someone swapped a 727 into. While I had the trans out I researched the part number and looks like it is from a 72 360 vehicle. So, the new converter arrived yesterday and I compare it to the one that was in the car. When I notice a difference. The old one has weights welded onto it....the new one for the internal balanced 340 does not.
Am I wrong or does that old TC look like one for a externally balanced 360? And would that cause that untraceable rough idling in gear?
Be well
Pat
Hey Folks,
My 340 has forged crank/rods internally balanced, and has idled rough while idling in gear since the day I bought it. Not just a cam with lots of overlap rough, but like a non-firing cylinder type of rough. Did all the basic troubleshooting. Compression test, wires, checked for vacuum leak, etc. all cylinders were firing. But it ran well overall. Weird...?
As some of you may know, the Duster's been out of action while I perform some much needed (and long put off)repairs. One of which being replacing the seals on the 727, i.e. front pump seal, bushing, shifter pivot seals, replace the converter etc. The car is a 4 speed car that someone swapped a 727 into. While I had the trans out I researched the part number and looks like it is from a 72 360 vehicle. So, the new converter arrived yesterday and I compare it to the one that was in the car. When I notice a difference. The old one has weights welded onto it....the new one for the internal balanced 340 does not.
Am I wrong or does that old TC look like one for a externally balanced 360? And would that cause that untraceable rough idling in gear?
Be well
Pat
