Almost got to the starting point today hardware wise. Found similar rotor I had for 5000 miles (5Kohm) on the spare parts bin and installed it. Also installed new distributor cap and the old bosch plugs I had when it ran fine BUT tried the 0.04 gap everyone uses.
Started the car and backfire.
Adjusted timing to where it was earlier at around 40BTDC!! and no more backfiring and nice idle but it still does not run good. One or two cylinders are out I think, atleast when driving. When I got back from a small testdrive the 5Kohm rotor had already cracked on the epoxy.
I don't think I have ever had nice consistant non_misfire idle so something might have been done wrong before I got the car?
Strobo cuts atleast on cylinders 1,2 and 3every couple of seconds. I haven't swapped the plug wires yet as I don't have spares. Resistances look ok though.
1 1.86
6 4.86
2 2.07
4 4.01
3 2.5
5 4.36 Kohm
Forgot to measure the coil wire : (
Now the strange part:
Quote:
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Check the polarity of the magnetic pickup wires of the distributor. Reverse the connectors and check the timing again. For Analog ignitions the correct polarity is whichever orientation gives the most retarded timing.
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I changed the polarity on the magnetic pic-up wires (had to cut the connector a bit to be able to change the polarity). It does change the timing to more normal values (more retarded and according to the quote above is the correct way to wire those) and it idles ok but sounds like an v8 rumble but also makes some kind of mechanical noises. I did not try to drive it as it makes the engine click/knock slightly on the front of the engine (fuel distributor end)?
Swapped back to the high advance polarity like it has been for one year when I got the car.
I did not check the exhaust leaks as this clearly seems ignition related.
So no more bacfiring on idle (more advance) but it does not run on 6 cylinders.
It almost sounds like the 1 6 2 4 3 5 is not the correct order for this engine but when I adjusted the valves this order had the valves loose.
Tomorrow I will once again strip the IC and stuff and try much smaller spark plug gap. Not much more I can think of doing unless the polarity change makes sense even though it gives the mechanical noise?
I have to check the coil too.
Any more ideas?
TIA