My 67 Rivi has a hesitation when the first pressure is applied to the gas pedal with the car in gear. This happens when your coming off a dead stop or coasting and ingage the pedal. Once past the first 1/4 inch, or so, of the pedal there is no hesitation in any other area of acceleration. I suspect a carberator problem but don't see anything obvious (the accelerator pump is working and no noticable vacuum leaks). When the engine is in nuetral or park no hesitation exists. Any Ideas? the Carb's a Q Jet on a stock 430.o No:
leak sounds lie a vacume leak to me or it could have something to do with the accelerator pump on the carburator
It is easy enough to determine which is causing the problem. This is mainly based on a Q-jet. Did the '67 have a Q-jet? For an accelerator pump, with the car off, breather off and choke blades open, just work the throttle and see if gas is visible down the front two barrels. Don't do it more than once or twice or you'll flood it. As you say, it is the early part of the stroke so pay attention to that portion for your test. Replacement is simple and/or cheap, even if you have to pay to have it done. For a vacuum leak, use something harmless like WD-40 and with the breather off and car running, squirt little bits of WD-40 at the base of the carb and around the various lines. When you find the vacuum leak, it will generally pull the motor down as WD-40 is displacing air needed to burn the gasoline, making a rich mixture. Good luck
hesitation On your problem many things 1- make sure you see a good stream of fuel in both barrels right from the start of movment. 2-chech for ported vacuum going to the vacuum advance, then check the vacuum advance by applying vacuum to the vacuum advance and see if the timming mark moves 3- would be the primary metering rods being stuck and not opening up on vacuum drop ( when you crack the throttle open )4- Buford made a good post on throttle shaft worn out, this could also cause a rough idle and having trouble setting base idle speed. Hope this helps, AL.
Check for a sloppy front shaft..common on QJets. It causes a variable vacuum leak and lean condition at idle and low speed. Good luck! :beer Frank
