car struggles to start then runs fine

Your car is hard to start and its definitely not the battery. You cant unlock the doors roll the windows down nothing works.

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If that is the case you can try replacing the wires or cleaning the connections.

. But after sitting starts right up I have a 1994 Mustang and after it has been running will not start. Turn the ignition on and see how much fuel the pump is pumping you shouldnt need much on a carb engine so. Thats because the fuel pump only runs for a second or two and then shuts off when the ignition switch is turned to the run position.

This is what I have done. Well unfortunately this could mean a damaged alternator. Up to 8 cash back The most common problem encountered that will cause this problem is a fuel pump in the fuel tank not holding fuel pressure up to the engine for any length of time.

This throws off the expected air fuel ratio and causes the vehicle to run lean in other words too much air for the amount of fuel that has been injected. - Tested battery with car not running 131 volts - Tested battery with car running 136 volts - Checked all wires and connections. This can be caused by a weak battery or starter motor.

Dont let the name fool you it can even malfunction when its warm. Your car is only slow to start first thing in the morning. So the fuel pump doesnt cycle enough times to reprime the fuel system.

There could be a hidden drain on the electrical system causing the issue. Up to 8 cash back There are many causes of hard starting but illustrative ones are a faulty engine coolant temperature switch sensor malfunctioning idle air control IAC valve vacuum and EGR leaks inadequate fuel delivery or pressure clogged fuel filter injectors and contaminated or old gasoline. This time I had to have it jumped and it took about 10 minutes of charging to get it to start.

2 Bad Vacuum Leak. To diagnose the fuel pump an amp clamp is placed over the positive pump-wire. The fuel system needs to hold pressure to the fuel injection in order to start after sitting.

The car wont be able to start if the alternator cant provide enough voltage output necessary. How to address it. In addition a fuel injector or weak battery may be reason of such an engine-starting problem.

However if I drive it around 30 mins stop the engine and then try to start it again it almost doesnt start at all. The simplest test would be to take the fuel line off the carb and put it in a jam jar. If engine spark plugs are not dirty or damaged then the choke needs to be repaired or adjusted.

If I start it in the morning -- no one has used it for about 12 hours -- the car starts perfectly with a smooth key turn. The most common problem encountered that will cause this problem is a fuel pump in the fuel tank not holding fuel pressure up to the engine for any length of time. Faulty Cold Start Valve.

If you do not fix the alternator this. An engine needs a minimum cranking speed to start if the starter or battery is weak the engine cranking RPM will be low which causes the engine to build compression slower and make it harder to start. Sometimes this issue makes your car hard to start but runs fine once it gets going.

If it does either the fuel pump is getting weak fuel filter partially plugged or injector is leaking off. Inspect Fuel Pump. It has to turn over eight or nine times before it starts.

Then compare the recorded readings to the manufacturers defined specification. The only solution to this is to fix or replace the alternator. You can check it with a DVOM checking its resistance at cold and.

If your car does run fine and there are no signs of leaks smells or bad wiring this could be your issue. A failed cold start valve will keep your car from starting when the engine is cold. Turn the ignition switch to the run position so that the dash lights come on for two seconds and turn the ignition switch off.

Measure the health of your battery to make sure it isnt failing. Next start the vehicle and use a voltmeter to set and record the amperage reading. Resolving car wont start unless I give it gas problem.

If either of those wires are making a poor connection or have become broken or corroded they could be giving a weak signal or insufficient power for your car to start. A bad battery will make your car start slower and slower over time as it outputs less and less power. Since then I have this strange problem with it.

Maybe there is something wrong with it causing it to not get off cold start mode which is fine when the engine is cold but once it warms up floods the engine and makes it hard to start. After sitting for a bit it starts up. If it is an EFI which just about every car has been for a long time car maybe the car has a bad 02 sensor if it is a very old car it could be a carburettor car with a carburettor problem.

It is like the battery is dead. Get this code read if you can as it may tell you the exact wire that is causing the issue. Slow to crank over.

Try turning the key to the run positiondo not try to start it just have the dash lights on for 2 seconds turn the key to the off position. Second if your car wont start then starts the next day this can be due to an alternator voltage leak. A mechanics diagnostics will point toward your next step.

An engine burns fuel most efficiently at a ratio of 1471 air to fuel known as AFR. Since cold air is denser than hot cold starts will require a fuel adjustment so that the engine has a rich fuel mixture for cold starts. An increase in viscosity of engine oil in the cold also causes slow cranking that leads to taking time to start or warm up engine.

Poor readings from a bad coolant sensor or wiring will cause incorrect fuelling and poor cold starts. A loss of pressure over time will cause the fuel not to be at fuel injectors when starting. Electrical system issue or weak battery.

- Compression tested again 161 psi - 183 psi. Next move on to check your battery and all of its connectors and wiring. A bad injector can throw the entire fuel system off and keep the engine from firing especially when the engine is warm.

A vacuum leak is a hole in a vehicles air intake system behind the mass air flow MAF sensor that allows unmetered air into the engine. Do this 3 times and see if car starts easily when you try to start it. But once it start it runs smooth and strong.

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