24
You are right in the thinking of using less gas and that's exactly what the purpose was to have the start/stop feature. The main goal of doing it (at least here in the States) is for zero fuel consumption/zero emissions while the engine is stopped. This provides for better overall fuel consumption numbers to meet what the EPA has mandated for companies to ...
20
The oil problem
You can run any engine speed you want as long as you keep the oil pressure up.
Because of the impossibility of getting a roller bearing down a crankshaft, engine bearings are "plain bearings" with polished steel floating above babbitt (a soft metal). The oil pressure makes the bearings "float", so the dynamic forces of pistons being ...
8
The engine needs a minimum rpm to idle smoothly - a v8 can idle smoothly about 500to 600rpm but a 1 litre 3 cylinder needs around 700 to 900rpm...
It is not the companies that really decided to do the start/stop, if you do some research the various governments have implemented legislation over the years that required drivers to turn off the engine when ...
5
From physical point of view, lowering the RPM means that you need to store the energy required to keep the engine running (and overcome friction) with a smaller angular speed. And the kinetic energy is proportional to speed squared.
If you want to go from 600 RPM to 100 RPM, you will have (among other things) to make the flywheel 36 times heavier. Of course,...
4
Car companies focus on stop/start of the engine simply because
There's a minimum RPM the engine can run at. You can sort of extend it using dual inlet/exhaust variable valve timing, but there are limits to that.
If the engine is running, it's consuming some amount of fuel always.
Also, some companies go bit further than stop/start. They stop the engine ...
4
If the machine is still under warranty, take it back to the dealer and have them fix it. That's what the warranty is for, and it's their obligation to do so.
New vehicle warranties come from the manufacturer, not from the dealer. If multiple dealers are available to you, you might take it to another dealer rather than the one whose "fix" was unavailing.
4
Sounds like your battery terminal connectors are stretched to the point that they are loose even when the bolt is fully tightened. Best fix would be to replace them with new connectors. Alternatively you could add a thin shim of metal between the post and the connector.
Since the metal lead (battery post) has a high thermal expansion coefficient, my guess ...
3
Welcome to Motor Vehicle Maintenance & Repair! I have a 1985 MK1 Golf Cabriolet running a Pierburg 2e2 which I've had a number of issues with so hopefully I can help.
This car runs a mechanical fuel pump so if the engine is turning over, the fuel pump ought to be drawing fuel. The fact that it ran on carb cleaner suggests to me that it isn't getting ...
3
According to this article, it may not be that the battery is drained, per se, but rather that it has lost quite a bit of its capacity.
The article states a battery will lose:
35% reduction @ 32°F
60% reduction @ 0°F
Plus, it takes a large increase of amperage to turn the engine at the lower temperatures. This is the double whammy. Just when you need more ...
3
The problem is between your battery posts and wherever you attach your jumper cables. Bad, loose, or dirty, oxidized connection.
3
Even though my old battery appeared to take a charge from a borrowed trickle-charger, I took it to Autozone and they confirmed it was bad: 11.83 volts, only 2% charged. With a new battery installed, she started right up. I was shocked!
If someone would like to summarize the answers/suggestions in the comments above and post them here, I'll mark your answer ...
2
Hybrid Newbie here. I got a CT200h and faced this problem yesterday (jumpstarting a dead IC car with my working hybrid).
After being somewhat overwhelmed with the dire consequences to all the futuristic computers aboard, I played it safe and solved it Old School.
I simply removed the tiny 12 volt auxiliary battery from the CT200. This tiny battery is ...
2
Another reason for burnt connectors could be from cargo or passengers sitting in the back seat on the driver's side. The weight on the seat cracks the plastic fuel pump cover and wiggles the connector causing the pins to heat up. If left too long, the pins will melt the plastic around them causing gas to leak through the connector. This happened to me ...
2
How are you starting the car? Do you wait till the glow plug light goes off before cranking?
I found that in my TDI, especially in winter, I had to cycle the glow plugs a few times and then it started no problems
2
The 13 is irrelevant here! Watch the voltage when you crank over-it will drop
This figure should not be less than around 10v -if it is, then the battery has no amp power to start the car and is defective, even if new
2
It ended up being the battery!
Got it replaced.
2
As @SolarMike says, there's quite a few questions on similar subjects here - see the long-term-storage tag and the linked question
There's only one thing I'd add to the answers in the linked question, and that is to consider the environment you're storing it in - Florida is known for a warm, damp climate, which is ideal conditions for mould and mildew to ...
2
Thanks for all of the comments and suggestions for how to get my golf to run. I took a second look at the Pierburg, removed all the jets and measured the fuel flow and float angle. I found that the one of the pull down units wasn't creating a vacuum and replaced that - Unfortunately it nothing solved my immediate problem.
So I turned my attention back to ...
2
Aight, so I replaced my battery connectors this after noon along with the old battery, and she started right up.
Thanks for the help
2
Honda had a pretty big problem with their relays. Once the interior of the vehicle heated up, the small circuit board in the relay would expand and the tracings on the board would open enough to cause a no start. Leave the car and let it cool and it would contract and get contact again. Fix is to solder a jumper wire or just replace with an updated relay.
2
I have the same feeling that @dmitry-grigoryev has said,
it doesn't save fuel with every stop, but it does save fuel on average. Typical traffic lights work in cycles of 30-60 seconds, so on average you stop for half of that time, 15 to 30 seconds. There are cases where it doesn't make sense to stop the engine, like slowly moving traffic jam, or when you ...
2
Assuming you've double checked all fuses for continuity, and you're confident that no pins or wires were harmed over the course of your blinker diagnosis, we'll start simple and go from there.
You said your dash lights are functioning at the key-on position, which is a good sign. Do you also hear the Fuel Pump priming? if not, do you see a red or yellow '...
2
There's likely some variation between the setup in different vehicles, but here's how it's set up on my manual trans Mazda 3 -
The button will put the car into the 'ignition on' state if it is pressed while the clutch isn't down. There's no interlock with the brake or gear lever. As such you could do this before your helper starts pushing, or while in ...
2
This sounds like you have a power leak somewhere draining the battery as it sits overnight. This could be a simple as a map light being left on or a trunk light or something similar staying on due to a faulty switch.
The other cause of a power leak would be a short in a wire or component that isn't bad enough to blow its fuse but enough to drain the ...
1
I'm answering my own question to hep someone come across this thread in future, it was the starter motor.
1
Had problem like this before, it turned out to be the coil, once it got hot it separated an internal contact.
I fitted a new coil and it was fine. If you can get a known good spare that would be a good test.
1
The 3116 is a Diesel engine - so you need three things to start it - an air/fuel mix, compression and heat.
The voltage seems a bit low, I'd expect to see slightly over 12v with everything switched off. Give the batteries a good charge to make sure.
Things to check - is the fuel getting through? Can you smell unburnt fuel coming out of the exhaust? Is the ...
1
Many times an earth strap to the engine or the bodywork can be loose or corroded and give problems that seem like a failing battery even when the battery is new or good.
1
Batteries have voltage and they have amps (simplifying a bit here). It's possible for a car battery to "go bad" in a way that will give a good voltage reading, but not have the power (amps) to do much work at all.
Another issue that can look like your symptoms is a loose or corroded battery terminal clamp. If the connection is bad, it will show a good ...
1
One of the few things affected at fuel fill is tank pressure and the vapor recovery system.
My guess is you are adversely affecting the carbon cannister vapor recovery system during fuel fill.
First i want to verify you are NOT doing a fuel fill to the tippy top. This is really a BAD thing to do. When you are filling up the tank and the pump clicks off ...
Only top voted, non community-wiki answers of a minimum length are eligible
