Hello guys after long long time!
First about car:
126p from 1977 with 600cc engine. Engine have 120000 km.
Now about problem:
Two years ago this problem started. When engine is warmish i cannot start it.
Why is it strange? When engine is full cool or full hot it starts like whirligig but when i stop for few minutes it just don't want to start. It spins and spins and there are some signs of life but not enough to start. Now, if i try to start car by pushing it ( few guys push and i try to start) it again starts like whirligig!
It runs like a charm, i even managed 118km/h on highway, runs on idle like a charm but when i stop the engine it just don't want to start if it is warmish. If i stop the engine and after few seconds try to start it (when its full hot), it starts without any problem.
When it is warmish it has spark on both spark plugs, i can see gasoline flowing from fuel pump to carburetor, and starter spins it like it should, fast and strong ( this method is not so accurate because measuring tools are my eyes and ears)
New installed parts:
fuel pump with new hoses
carburetor
air filter
ignition coil (Iskra ATA)
distributor with new capacitor (220nF measured with Fluke instrument), cap, rotor and platinum points
starter
spark plugs (super bosna F65P)
Spark cables and cable from ignition coil to distributor
I exchanged part by part to try to see if there is any difference but without success.
I removed rubber around spark plugs to see if they became conductive somehow but they didn't.
Connected fuel pump to bottle with gasoline to see if it is problem with gasoline or hose from tank to pump, but it wasn't
Connected 10mm2 cable from - battery to ignition coil housing, and from ignition coil housing to engine, just to be sure i have good connection with - battery (even thought i have spark on spark plug all the time). That also didn't help.
Removed air filter and its housing, didn't help
Removed gasoline tank cap (don't know english term for that sorry) so there is no vacuum in tank, didn't help.
I am desperate, really don't know what to do anymore...
It is not so big a deal to wait 30 mins to start it again or find few guys to push me but i cannot pass vehicle registration because they stop the engine on some point...