8track

Hi all,
I just bought a beautiful civic cvcc hatchback ED3 (California) with hondamatic transmission and only 84000 miles. It's in superb condition with one exception : the acceleration performance in either range 1 or range 2 has a dead spot between idle and high rpms. Acceleration is strong for the first inch and a half or so of pedal travel, then engine bogs down for the next three inches of pedal travel, then returns to stronger accel for remaining pedal travel to the floor. Its like a flat spot. I tried richer & leaner idle mixtures, but hesitation remains. With choke on, acceleration is better, but the dead spot remains although narrower. I have replaced spark plus and same results. I tried adjusting main and aux float levels and same results. This seems like a solvable problem. Any ideas out there?

sdaidoji

iTrader: (1)

fuel filter/line? clean the carb completely?
PS: Not many here is used to carbs adjustment, so be prepared to few responses...

maybe ezone will reply soon, 'nother old schholl guy

8track

Additional info: under no load (engine running in Park/Neutral), the throttle/rpms rev up normally with a smooth, continuous ramp. No sign of a flat spot or hesitation. When I am in gear under load, the acceleration is good from a dead stop until I push the pedal beyond a point. If the car is moving slowly (low rpm's), the acceleration never reengages even down to full throttle. As I hit higher speeds/rpm's, the throttle power returns closer to the floorboard. Does that make sense?

8track

Additional info: under no load (engine running in Park/Neutral), the throttle/rpms rev up normally with a smooth, continuous ramp. No sign of a flat spot or hesitation. When I am in gear under load, the acceleration is good from a dead stop until I push the pedal beyond a point. If the car is moving slowly (low rpm's), the acceleration never reengages even down to full throttle. As I hit higher speeds/rpm's, the throttle power returns closer to the floorboard. Does that make sense?

sdaidoji

iTrader: (1)

new cable?

8track

I don't see any throttle linkage issues related to the cable.

I've decided to go ahead with a carburetor cleaning/rebuild. Got advice on a supplier for a rebuild/gasket kit from another forum. Great part selection at rockauto.com for classic cars. Will update as things progress.

sdaidoji

iTrader: (1)

good luck, sorry for not being too much help...
been 10 years since i worked in carbs...

8track

While I'm waiting for the carb gaskets to come in the mail, I think I'll check out the distributor. It has a vaccuum assisted timing advance / timing retard function that might have an engine load / rpm response like this if it's not working right. Maybe that will jog a few memories.