Car recently had tune up. Idling beat is not uniform and there is indication that it may cut off but does not. No matter how long the engine is kept idling and the car is in reverse it will cut off. If I give it sudden gas or if I take my foot off the gas pedal it cuts off in reverse. Going forward the car will shake, buck and cut off. Turning the ignition will start the engine promptly.
Once car begins to work properly after the above, it continues to accelerate and only when I am slowing down or come to a stop light it threatens to do the above.
The top part of the carburator was sprayed. The module in the distributor was changed. My mechanic says that the only thing left is to clean the gas tank which to my knowledge has never been cleaned. Car is mazda 323 1987 model, 4-door sedan
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Re: Is it a Gas Choke
How many miles on this car? providing the choke is all the way open at operating temps and the engine is still not smooth and the tune-up parts are new, i would search for a vacuum leak somewhere on the intake manifold and carb. using carb cleaner with engine running spray around intake and lower carb if idle changes, you have found a leak. make sure the choke is working properly!! dirty fuel tank is possible but not likely, with a tune-up i would assume the fuel filter was changed. was it dirty? was the timing checked? does car run well at speed driving down the road?
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Possible that the timing/Tuning of the engine is not correct, the compression and firing on all cylinders is not uniform or that the engine suspension/foundation is weak or gone bad.
You need to check on all the above to confirm the fault , set the idling RPM and see the vibration , then check compression and firing in all cyclinders to get to the fault.
Good gas mileage on this car should be 19City 27Hwy. Gas mileage can be affected by many things. Assuming that the car has been recently tuned as you have indicated, I would:
Check tire pressure first<-you'd be surprised what low tire pressure can do.
Check for low oil level <-engine friction
Cheap spark plugs.
Let me know.
Your car doesn't have a choke. Fuel injected engines alter the mixture using information from the sensors to give the right mixture all the time, thus negating the need for a choke. This is only for carbureted engines, and your car is not. If it's idling fast, you can change the settings on your idle set screw, or have it tuned.
the only thing that can cause this is maybe you have a bad planium gasket but before changing this you could also have gotten some bad gas cause most gas have 12% water or more so try STP gas treatment first
the problem you are stating here could be a combination of problems, meaning it could not be solve with a single solution.
based from your description, it could be starving fom gas .
it would starve from gas if the filter is clogged( fuel filter) then before the carburator, there is still a strainer. might be a good place to check that one too.
then the tank as your mechanic has stated, could be dirty and needs to go down.
another thing to look at the tank is the water. since it is getting cold, water condensate couls slip in specially on cold weather.
then the carburator itself. it may have a clogged cavity or dirt could have accumulated and could not be solve by spraying with carburator cleaners.