What are some things to replace when a car hesitates at low rpms?
First off figure out and diagnose why its doing that, or else you wont have a clue what it is or else youre going to just be throwing parts at it and money down the drain by just simply guessing. From my experience its not one cut and dry answer It could be lots of things. Most likely if it has a carburetor the carburetor needs an adjustment, or spark plugs are old and worn out, air filter is possibly worn out and clogged with debris so its restricting the airflow. Oxygen sensor is a possibility. Or it could be a fuel filter/injector clogged/ fuel pump blocking proper fuel flow. The catalytic converter or exhaust could be clogged up with carbon deposits, but i doubt that. Lastly if its really high mileage like 200,000–400,000 miles and it could just simply be old and worn out and the piston rings arent sealing very well, so its low on compression which will make most engines low on power but thats pretty unlikely especially if youve taken good care of it, done oil changes on time and its maintained. All these items are consumables, they are regular car maintenance repairs. Its amazing how much better a car will run when you replace all those things and wear out over time. Take it to a reputable ase certified mechanic or if the car is under warranty go to the dealer. Or if you got a buddy thats good with cars take it to him. The good news is its usually something simple, and all those things arent hard to fix unless its the fuel filter/fuel pump. tell me how it goes. Good luck dude!
Can a bad car battery cause engine misfire?
So everyone on hear that says a weak battery cannot cause a misfire is wrong especially with a Subaru!!! I recently ran into this exact same problem with my 2013 Subaru Impreza 2.0L. My car began to have a rough idle anytime I was sitting at a stop light. Then the CEL came on for a misfire in the cylinder and the dealership wanted me to do $1000 worth of work replacing the coil packs and spark plugs. I specifically asked them if a weak battery would cause the problem and they said no as well. I knew my battery was weak because I couldn't leave my car radio on for 5 min with out the battery dying. All battery tests I did said the battery was fine. Today I finally got sick of having to worry about it not starting from leaving the door open or the radio on while it wasn't running. Sure enough my check engine light turned off and now my car has greatly improved performance! Also my car now idles like it is supposed to. I'm thinking my fuel pump was not getting enough power which caused the misfiring. Either way the problem is fixed and I suggest looking into the battery first!
Is it natural for an old diesel vehicle to blow black smoke on acceleration? Or is this a sign of a worn engine?
This is soot. It occurs when too much fuel is injected into the combustion chamber for it to burn completely.In older engines, the fuel system will make assumptions about how well the engine is breathing and the maximum injection volume will be tuned accordingly. If the engine has trouble breathing, e.g. due to a clogged air filter, the assumption will be wrong.Modern engines have control units that actively measure air mass and make appropriate adjustments.
What does it mean if a diesel engine throws white smoke?
White smoke from a diesel is usually from unburned fuel. When combustion is incomplete, a diesel mist comes from the exhaust. It is very common when starting a diesel in very cold weather.It can occur from bad rings or valves not properly sealing the combustion chamber, an engine running too cool for complete combustion, defective injectors, or bad injector timing.The other possibility is a leaking coolant system. Coolant can enter the combustion chamber from a cracked block or head, a bad injector sleeve, blown head gasket, or even a leaking intercooler.The difference is that coolant smells sweet, and white smoke smells like fuel.
What are the symptoms of a burnt exhaust valve?
The symptom you’re likely to notice the most when you have a burnt exhaust valve is a loss of power from the engine and an increase of fuel consumption as the engine is run harder to do the work expected of it. Other symptoms will be dependent upon how badly burn the valve is. You’ll be looking at a valve job to correct it, or else swap out the cylinder head altogether.When the edges of an exhaust valve burn, the combustion chamber no longer seals and not only do you lose compression in that cylinder, unburnt hydrocarbons will be exiting before they can be ignited.Running an engine low on oil will often burn one or more valves before the main bearings start to pound. Otherwise, a lean fuel mixture can cause this, too.On modern vehicles with a full exhaust system, the sound can be hard to discern. However, a cylinder leakage test will pinpoint it fairly well. Your pressure loss will be fairly high and you’ll hear the pressurized air escaping through the exhaust system, rather than through the intake or the crankcase. If you hook up a vacuum gauge, you may notice a steady loss of vacuum at idle if a valve is burnt or sticking.