nosaj2k
Jr. Member
Alright fellas,
I realize diagnosing drivability issues via the web is difficult at best, especially given the numerous variables potentially involved. But I’ll go against conventional thought here anyway. I have a 1970 Bronco w/a relatively stock 302. I say relatively stock because I suspect the PO had the engine rebuilt/installed with a slightly larger than stock camshaft. Additionally, I am running a Pertronix distributor. I am guessing the engine has roughly between 10,000 to 40,000 miles. Carburetion is handled by a recently rebuilt Autolite/Motorcraft two-barrel 1.08 venturi 2100 carburetor. Gearing is 3.50:1, and I’m running 33” tires (I know). The issue I am having occurs under normal, low key street driving conditions. Just off-idle, the Bronco tends to stumble, or hold back for a second before beginning to accelerate. This also occurs upon acceleration immediately after shifting (manual trans). This issue was present prior to the carb rebuild - In fact I have had this same problem with two other 2100 carbs (so you're telling me it's not the carb?). I am currently running 46 jets (6200’ in elevation), and have moved the accelerator pump rod to the top hole in the over travel arm. This problem tends to get better as the engine warms, but even at full operating temperature it's still very apparent. Aside from this annoyance, the thing runs EXCELLENT. Oh, and no vacuum leaks to speak of.
Any thoughts? Thank you in advance.
I realize diagnosing drivability issues via the web is difficult at best, especially given the numerous variables potentially involved. But I’ll go against conventional thought here anyway. I have a 1970 Bronco w/a relatively stock 302. I say relatively stock because I suspect the PO had the engine rebuilt/installed with a slightly larger than stock camshaft. Additionally, I am running a Pertronix distributor. I am guessing the engine has roughly between 10,000 to 40,000 miles. Carburetion is handled by a recently rebuilt Autolite/Motorcraft two-barrel 1.08 venturi 2100 carburetor. Gearing is 3.50:1, and I’m running 33” tires (I know). The issue I am having occurs under normal, low key street driving conditions. Just off-idle, the Bronco tends to stumble, or hold back for a second before beginning to accelerate. This also occurs upon acceleration immediately after shifting (manual trans). This issue was present prior to the carb rebuild - In fact I have had this same problem with two other 2100 carbs (so you're telling me it's not the carb?). I am currently running 46 jets (6200’ in elevation), and have moved the accelerator pump rod to the top hole in the over travel arm. This problem tends to get better as the engine warms, but even at full operating temperature it's still very apparent. Aside from this annoyance, the thing runs EXCELLENT. Oh, and no vacuum leaks to speak of.
Any thoughts? Thank you in advance.
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