Quote:
Originally Posted by MidnightAuto
I’ve been trying to dial in my carb a bit after adding 1i ch spacers under all 3 of them. Car ran great but the A/f was a little volatile fluctuating 2-6 points. Over the last week the car has started to run poorly. Here are the specific symptoms:
Idle a/f is good at 13 with 11 vacuum at 740 rpm. Low rpm cruise (1200-1900) with 16 vacuum is runs fine, fluctuates between 12 and 14 a/ff. When I slowly move up rpm (2000-2500) vacuum drops to 8 and a/f goes to 16-17. Car runs bad hesitating, light back fire/miss, etc.
Dick b was helping me troubleshoot the carb, it is a new rebuild and has run great for last year. But as we dove into, all the carb checks seem fine. So I am starting to think it’s something else.
What would cause a lean condition as vacuum drops?
Timing is initial 17 and total of 36.
I do have a petronix 2, but have never had any issues with it. Not sure how I would trouble shoot that to begin with.
Thoughts
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Dick Bonesake is Top Notch great guy in my Book!
Selfless and always more than happy to help and keep the hobby alive!
I'm sure he had you modify the cluster per your engine specs.
You can test your Pertronix with a good timing light and rev it up to assure it's not doing something crazy.
Also, monintor your fuel pressure.