If the intake manifold has a huge piece broken off of it will the car still start then cut off ?

I recently discovered a piece of my manifold broken off while changing the rear valve cover,coils and plugs.
I kind of made it way worse now it's two times bigger than before.
When I try to start the car it starts then shuts right off.
I'm guessing it's due to the vacuum leak.
Any temporary fixes or only new installation is required ?

My car has 220000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
If the broken off piece is admitting unmetered air to the intake, then yes that will have the effect of stalling the engine. A big initial concern is be sure no debris gets in there because anything in the intake will be sucked into the engine with potentially disastrous consequences. So, if you are awaiting a repair tape over the hole or somehow close it off. I was going to suggest taping it shut with duct tape so you can attempt to use the car temporarily but that is actually pretty risky because if the tape breaks free that itself will be drawn into the engine. Basically, the safest and most efficient thing to do is just get it repaired. If that is all that is wrong (or broken), it is no big deal and a certified Mechanic from YourMechanic could be dispatched, if you desire, to replace the intake manifold and gasket right at your home. The manifold is probably a dealer only item, so that has to be checked. Used manifolds might be available at lower cost via Car-part.com but the savings have to be substantial (at least 50% off new) to justify using a used part in this case.

How to Identify and Fix Common car Problems ?

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A vacuum leak caused by a bad intake manifold gasket can throw off the engine`s air-fuel ratio and cause engine performance issues such as misfires, a decrease in power and acceleration, a reduction in fuel efficiency, and even stalling.
A leaky intake manifold sucks outside air in, rather than dispersing air out. This can cause performance issues including poor fuel economy, decreased acceleration, and engine misfires. Coolant leaks can cause the engine to overheat, although they may not always be visible.
If the intake manifold is bad, it can mess with the engine`s air-fuel mixture, which can then mess with the engine`s performance. You may see a reduction in power, uneven acceleration, and even backfiring. The same is true for the engine`s cooling system.
It`s not a good idea to drive your car if it has a bad intake manifold, for these reasons: If you`re losing coolant, your car could overheat. If your car is stalling or not performing properly, you could get into an accident. A minor intake manifold problem could turn into a major one, if you neglect it.
Sporadic Idling

One of the primary signs of a vacuum leak is sporadic idling. You might notice that your engine is idling fast while you are at a stop, particularly if your tachometer is bouncing up and down or resting at a setting that is too high. The sporadic idling is being caused by too much air in the engine.

Vacuum leaks, especially those that are confined to one cylinder, will cause the engine to idle unevenly and possibly misfire. This is because the vacuum leak allows additional air to reach the affected cylinder, diluting its air/fuel mixture.
Sealing Intake Manifold Gaskets. There are a couple of different sealers we like to use when doing this kind of work. To hold the intake gaskets in place on the head, we like Edelbrock`s Gasgacinch, which is a simple contact adhesive. For RTV, we like the Permatex Ultra Gray or Optimum Gray.
If the intake manifold gasket does not make a tight seal around the coolant ports, it may leak coolant into the crankcase. If it fails to seal tightly around the intake ports, it may allow vacuum leaks that upset the air/fuel mixture and cause idle and driveability issues.
Besides leaks, cracks in the manifold can allow outside air in, which in turn can cause the engine to stall or die. If the crack isn`t fixed in a timely fashion, you can also cause major damage to the engine, such as blown head gaskets and overheated heads.
Leaking Coolant

When intake manifold gaskets become damaged, coolant may begin escaping from its system. Eventually even a relatively small leak will eventually cause coolant levels to drop to dangerous levels. Be sure to take note of any signs that your car may be experiencing a coolant leak.

Usually, when the leak isn`t too bad, you will hear hissing noises coming from the engine. This may also sound like whining sounds or whimpering sounds. For more severe vacuum leaks, the noise is sucking or suction, much like a vacuum cleaner.
Typically, a vacuum leak will cause situations like hard starting, rough idle, excessive fuel consumption, and engine codes. You might even be able to hear a leak – sometimes a whooshing or whistling sound can be heard with the engine running.
Typically, a vacuum leak will cause situations like hard starting, rough idle, excessive fuel consumption, and engine codes. You might even be able to hear a leak – sometimes a whooshing or whistling sound can be heard with the engine running.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

If the intake manifold has a huge piece broken off of it will the car still start then cut off ?
ANSWER : If the broken off piece is admitting unmetered air to the intake, then yes that will have the effect of stalling the engine. A big initial concern is be sure no debris gets in there because anything in the intake will be sucked into the engine with potentially disastrous consequences. So, if you are awaiting a repair tape over the hole or somehow close it off. I was going to suggest taping it shut with duct tape so you can attempt to use the car temporarily but that is actually pretty risky because if the tape breaks free that itself will be drawn into the engine. Basically, the safest and most efficient thing to do is just get it repaired. If that is all that is wrong (or broken), it is no big deal and a certified Mechanic from YourMechanic could be dispatched, if you desire, to replace the intake manifold and gasket right at your home. The manifold is probably a dealer only item, so that has to be checked. Used manifolds might be available at lower cost via Car-part.com but the savings have to be substantial (at least 50% off new) to justify using a used part in this case.

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ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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At that point, it will use other methods to determine the fuel rate, such as pre-programmed fuel maps, throttle position, etc. I would suggest replacing the MAP sensor and retesting. If you would like to have it checked first, a certified technician from YourMechanic will be able to scan your vehicle and test components to determine the root cause of your starting issue before making a repair.

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ANSWER : Hi there:

Sometimes when you have problems starting an engine initially it is caused by a restriction in fuel flow; caused either by clogged fuel injectors or the throttle body that needs to be cleaned. Once the fuel starts to flow and engine warms up, it’s much easier to start. However, it could also be an air filter, EGR valve or other components that causes this issue as well, which is why it’s best to have a professional mobile mechanic complete a car is hard to start inspection so they can pinpoint the source of this issue.

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