Nettet16. feb. 2007 · The idle screws turned full in is usually a sign of an internal leak. One idle screw when turned fully in should cause the car to stumble and both will normally … Nettet2. mar. 2005 · Hold off on the radical diagnosis until you check it out at 180 or "normal" operating temperature. A cold engine is always stumbly. Let us know how that goes, and we'll continue the virtual tune up then. FYI- Every Holley carb I've ever "cured" of the flat-spot was way out of proper adjustment or was mis-timed.
Accelerator Pump Tuning for Holley Carburetors
Nettet29. mar. 2010 · I have been talking to a few Holley carb gurus, and they all told me that it is not un-common what I had to do to fix the problem. +1. After playing around with bigger squirters, larger accelerator pumps, different accel pump cams and trying various power valves, the only thing that fixed an off idle bog was larger jets. Nettet1. mai 2010 · Too rich would have it pouring black smoke when floored and slow acceleration but not have a real stumble that you can "catch back" by feathering the throttle, feathering will just make a rich condition worse. If you can throttle back and the engine"catches up" with the carb it is not a rich problem. prolite led lighting
Lean Holley "tip in" - Page 2 - Don Terrill’s Speed-Talk
Nettet27. aug. 2010 · I got an issue with my 63 nova. The engine idles ok and revs up nice in park but when I'm cruising in first gear and I floor it, the engine stumbles for about 2 seconds and then wants to rev up ok. Feels like its pinging almost. Coolant temp is around 170. I have a 350 with about 9:1 compression, a COMP Cams 12-676-4 - COMP Cams … Nettet1. sep. 2004 · Instead of 16 to 18 inches of manifold vacuum at idle, many big cams will support barely 4 to 6 inches. This reduced vacuum requires more throttle opening to … Nettet11. apr. 2024 · Looks close to stock from what I can tell so far. Down leg boosters, 50cc, 28 squirter, brown cam, 6.5 pv. The metering block doesn't look modified, but I still need to check the metering block and bleed sizes. This is a gas 6cyl class @ 250cid engine. The car had a major stumble off idle on quick throttle moment last year. labeless water