Hi folks,
I have a 78 403 Olds with a rebuilt matching 17058253 with parts and specs from Cliff. It was running well a number of years ago, then the vehicle went into project stage of sitting around.
I'd occasionally kick it up and needed to adjust the choke for better start or idle as it was never perfect. As usual, somewhere along the way it got worse and I'd tried a few things, I adjusted nearly everything in and out just to record where they were at compared to my original notes and have a think.
The choke fast-idle cam was giving me some grief. In typical carb style I could get it back to starting nicely but stumbling as it warmed up, or hard to start, but then idling nicely once warm.
Then it sat some more, moved house, car is in storage and hasn't been accessible until now. I can't even recall where I was up to but now upon attempting to start it is popping and banging and hard to start like the timing is way off. I haven't touched the timing. I also don't want to at this point as something else has done it that I'm not aware of.
So basically, before I go stare at it again, is there a choke or adjustment setting that can affect timing? Obviously vacuum-advance is connected, hasn't been touched. The choke fast-idle is perhaps a little high but I didn't think it was high enough to pull the timing right out on cranking. And do you think I can find my notes of all the current settings, no chance!
