Q: What could be wrong with my engine?

asked by on

My car made a loud hiss sound and now has no acceleration along with still making the hiss, there is what seems to be a valve stem with nothing connected to it and I was wondering if that had something to do with it? There is a slight gassy smell coming from the engine on start up and when pressing the gas

The sound may be due to a vacuum leak and that would include the PCV and EGR systems. There are other possibilities but initially the latter possibilities would be considered first. To get this problem investigated and resolved, your best bet is to request an unusual noise diagnostic - suspected vacuum leak. If you request that service, a certified Mechanic, dispatched by YourMechanic right to your location, will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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. What could be wrong with my engine?

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: Power steering quit working - 1991 Cadillac Fleetwood

Hi! I'd take a look to be sure the power steering belt is still there. With the engine running, you should be able to see the p/s pump pulley turning. The reservoir should be filled to the full mark. Listen...

Q: My Camry is starting at 2000 rpm's.

Sounds like there is a vacuum leak that is causing the engine to rev up high. If there is no vacuum leak, then the Idle Air Control Valve could be stuck causing the engine idle to fluctuate on startup. I...

Q: New oil filter replaced 5 days after oil change

Hey there. Yes it can. The reason it could have been leaking is because maybe something hit the filter while driving or the rubber seal on it didn't seal properly. You can change the filter without changing the oil but...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...