I know some transmissions can be left in neutral while being towed or when going downhill,so is an accord trans one of these? it's a 92
rolling downhill in neutral...
- Thread starter daves66nova
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It depends on the individual car.
Are you planning on having the engine running? If not, you shouldn't do it in any A/T car. For the sake of the transmission, and the fact that you have no P/S and very limited brakes.
Some cars' transmission fluid pumps run any time the engine is on, and others only kick on when the car is put into gear. I don't know which is the case with the Accord. But rolling the car down the road without the transmission fluid pump operating is basically denying the moving parts any cooling or lubrication.
If you're trying to save fuel, you'd be better off leaving it in "D". When idling, the engine requires fuel to keep running. But if the inertia of the vehicle is keeping the engine above it's idle speed, fuel is cut off. It's a gas saver that's been used by many (and by now, probably all) fuel injected cars. Honda's been doing it since the early 90's.
Are you planning on having the engine running? If not, you shouldn't do it in any A/T car. For the sake of the transmission, and the fact that you have no P/S and very limited brakes.
Some cars' transmission fluid pumps run any time the engine is on, and others only kick on when the car is put into gear. I don't know which is the case with the Accord. But rolling the car down the road without the transmission fluid pump operating is basically denying the moving parts any cooling or lubrication.
If you're trying to save fuel, you'd be better off leaving it in "D". When idling, the engine requires fuel to keep running. But if the inertia of the vehicle is keeping the engine above it's idle speed, fuel is cut off. It's a gas saver that's been used by many (and by now, probably all) fuel injected cars. Honda's been doing it since the early 90's.
I just don't see how a car an have its fuel cut off without some major commotion. I mean, when the fuel is cut off, wouldn't it backfire or stumble? And when the fuel system turns back on, wouldn't it surge or buck hard?
Use a trailer or a set of wheel dollies 
Originally Posted By: 55
I just don't see how a car an have its fuel cut off without some major commotion. I mean, when the fuel is cut off, wouldn't it backfire or stumble? And when the fuel system turns back on, wouldn't it surge or buck hard?
nope, none of those happen. They would happen if the ignition system was shut off and the engine still received fuel. Hybrid vehicles turn on and off the engine as needed. Ford is starting a new system in its 2010 gas powered trucks that aggressively cut off fuel at closed throttle while the vehicle is in motion.
I just don't see how a car an have its fuel cut off without some major commotion. I mean, when the fuel is cut off, wouldn't it backfire or stumble? And when the fuel system turns back on, wouldn't it surge or buck hard?
nope, none of those happen. They would happen if the ignition system was shut off and the engine still received fuel. Hybrid vehicles turn on and off the engine as needed. Ford is starting a new system in its 2010 gas powered trucks that aggressively cut off fuel at closed throttle while the vehicle is in motion.
If fuel is cut off, then why is the engine still on?
do you mean why is it still spinning?
I would not do this with an automatic trans.
But a manual can go downhill/coast in neutral with the engine running with no ill effects.
When towing trucks on their own wheels, the engine is kept running, or the driveshaft is removed.
BTW, the fuel is cut off with the throttle closed and in gear on most new FI cars when you let off the gas at higher RPMs. The fuel is again returned to normal/turned on at around 2,000 RPMs, as you decelerate.
But a manual can go downhill/coast in neutral with the engine running with no ill effects.
When towing trucks on their own wheels, the engine is kept running, or the driveshaft is removed.
BTW, the fuel is cut off with the throttle closed and in gear on most new FI cars when you let off the gas at higher RPMs. The fuel is again returned to normal/turned on at around 2,000 RPMs, as you decelerate.
Most FI cars for about the last 20 years cut the fuel off upon deceleration.
Originally Posted By: brianl703
Most FI cars for about the last 20 years cut the fuel off upon deceleration.
True. Even my '84 GN goes into fuel cut when the rpms are above 1,200rpm and my foot is off the gas.
To the OP, most autos have the pump on the front driven by the torque convertor. If you shut the engine off, the trans gets no lube yet the tires are still spinning the internals. It's a good way to burn it up.
Coasting with the car in gear engine running downhill uses absolutely no fuel. Make sure it's in a gear where the rpms are close to 1,000rpms above idle to make sure it goes into fuel cut.
Most FI cars for about the last 20 years cut the fuel off upon deceleration.
True. Even my '84 GN goes into fuel cut when the rpms are above 1,200rpm and my foot is off the gas.
To the OP, most autos have the pump on the front driven by the torque convertor. If you shut the engine off, the trans gets no lube yet the tires are still spinning the internals. It's a good way to burn it up.
Coasting with the car in gear engine running downhill uses absolutely no fuel. Make sure it's in a gear where the rpms are close to 1,000rpms above idle to make sure it goes into fuel cut.
Seek the owners manual for the towing notes. If there's speed limit for towing on drive wheels at neutral you know up to which speed it is safe.
Quote:
I just don't see how a car an have its fuel cut off without some major commotion. I mean, when the fuel is cut off, wouldn't it backfire or stumble? And when the fuel system turns back on, wouldn't it surge or buck hard?
This is answered but it could still feel erractic if fuel "cut off" isn't timed for progression (phase in slowly). In carburated fashion it is the deceleration valve which takes 5-10 seconds to open fully. And it is not even begin before releasing pedal for several seconds.
It could also be erractic w/o cut-off system anytime you close the throttle. This is programmed within the carburation (acceleration pump or injection). For example French practice of close paced traffic persuades for rather rapid integration to the "compression" (engine-brake) mode so that it is before one could apply the brakes after releasing gas pedal, for time advantage of slowing down as a safety meaure. Consumers think it is a light car.
Quote:
I just don't see how a car an have its fuel cut off without some major commotion. I mean, when the fuel is cut off, wouldn't it backfire or stumble? And when the fuel system turns back on, wouldn't it surge or buck hard?
This is answered but it could still feel erractic if fuel "cut off" isn't timed for progression (phase in slowly). In carburated fashion it is the deceleration valve which takes 5-10 seconds to open fully. And it is not even begin before releasing pedal for several seconds.
It could also be erractic w/o cut-off system anytime you close the throttle. This is programmed within the carburation (acceleration pump or injection). For example French practice of close paced traffic persuades for rather rapid integration to the "compression" (engine-brake) mode so that it is before one could apply the brakes after releasing gas pedal, for time advantage of slowing down as a safety meaure. Consumers think it is a light car.
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