I purchased my 240z last spring and have been delighted with its reliability, until the cooler weather set in. Now it seems to take longer and longer to start when cold (4-6) tries with patience in between-I don't rush her, but I am becoming concerned. Once she is warmed up she starts right back up. What should I be considering as a cause/solution, so my mechanic doesn't take me to the cleaners?
All my early Z's with SU carbs were harder to start in cold weather. I made sure that the choke was engaged as much as possible and the linkage was adjusted so the throttle plate openned just enough so the engine would run ok at idle when it was choked. Keep it rich at start-up. On a '72 I actually ran a different cable for the throttle (disconnected the throttle linkage from the choke linkage) so at start-up I could keep it extra rich. It was the only vehicle I owned and needed to use it in Minnesota winters. At best it only worked down to -10 to -15 F. No matter what it will still crank a long time before it starts. I hope this helps. There is probably nothing drastically wrong with the engine.
My '71 starts fine, just cranks longer, especially in winter. I have the stock roundtops, BTW...Try adjusting your 'enrichment circuit' cable. (Did I get that right, TonyD?) That is "choke" for us old carb guys......-----Bob
So I have a similar issue here in Sacramento (highs for day about low 60's) anyways, at the front of the air filter there's a "winter/summer" switch. I switched it to "winter" and now the Engine warms up faster (2-3 mins)
meant to post a "don't forget to switch the air filter switch" message, but guess this is good enough. Most people I would assume remember...
Crank starting takes 3-4 seconds instead of 5-6. Agree with the "make it rich" when starting...