Q: Engine swapping on a Subaru

asked by on

I'm interested in engine swap on my Subaru. If it's cold outside, it starts up fine, but if it's hot or the car has been running for a while, it takes multiple times before it turns over. Car runs fine if it starts. The compression is good.

When the car starts cold, it needs extra fuel. That’s just how the cars work. So if you have a normal car that is running perfectly and when you turn the key, the computer sends extra pulse to the fuel injectors so it starts when it is cold.

If your car starts fine when it is cold, but then when it’s hot, it doesn’t start and you’ve got to crank it over. That generally means that the fuel injectors are probably leaking or the fuel pressure regulator’s leaking. Because a hot engine is hard to start if it has too much fuel. It doesn’t need extra fuel. So you probably have a leak in the fuel injection system somewhere. Have the car looked at by a professional so they can locate the leak and make the repairs needed to resolve this issue.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Engine swapping on a Subaru

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car leaking water into driver's side when air conditioner on

The most common cause of the floor becoming wet when the AC is on is due to the AC vent becoming clogged. When this happens the evaporation which is a by-product of the evaporator core working properly and can begin...

Q: I checked the Check Engine Light and the code P1700 came on which relates to the throttle position sensor. How do I fix it?

Hi and thanks for contacting YourMechanic. The code P1700 is stored from a faulty vacuum box on the transmission kickdown cable or a vacuum leak. Check under the hood for any vacuum hoses that are broken especially the ones to...

Q: Could a bad fuel injector be making my 2007 Pontiac Grand Prix smell like gas?

It's possible that a leaking injector or injector o-ring could be making your Pontiac smell like gas. These items could also cause driveability issues, such as the ones you describe.There are other potential causes as well though, such as a...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.