Q: Low compression cylinder 2 and 4

asked by on

Hi, I got into an accident in my car listed above it is the SHO model. My car ran perfectly before my accident. I thought I just needed a new rim and to replace the inner fender well and bottom splash guard. I was crossing railroad tracks and my wheel went off of the cement panel and slammed down extremely hard. After the rim was fixed, I picked up my car and drove it to the grocery store. I came out and my car would not start, battery was drained. We had to try to jump my car for over and hour and finally it started. Then I get home and notice my car is leaking some sort of oil and running super rough and bouncing when the car was almost at a stop. I took the car to a separate mechanic and he told me my car was leaking from the power train unit (PTU) and the force from my accident definitely could have caused that to leak. He put a diagnostic tester on the engine and apparently my car now has super low compression in cylinder two and four.

My car has 58000 miles.
My car has an automatic transmission.

If the compression is below the minimum specified in the service manual, the mechanical (or head gasket) issue causing that will have to be resolved. Either the cylinders (2 and 4) are leaking through the head gasket, the valves or the rings. The compression test should be repeated, by the way, just in case the results are in error. At this point, if you want a diagnostic and a repair plan to get the car back in working order, please use YourMechanic’s service request page and the responding certified mechanic will address all of your concerns and let you know of your repair options and costs. 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. Low compression cylinder 2 and 4

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: Belt popped off car

The majority of the time, if the belt pops off the engine, either the belt or something else has broken. If the belt is not what broke originally, the belt may have been damaged after it came off by the...

Q: What could be the causing loss of power while accelerating leading to engine stalling? 2011 Chevrolet Aveo

Hi there - based on the symptoms you describe, I suspect that either the throttle position sensor or the fuel pump (or fuel pump relay) are failing. The result is either incorrect throttle position reported to the engine computer, or...

Q: 2002 Ford Mustang Key programming but only one original key

All you need is to have one original key that works to program new keys. All you do id turn on the ignition to run position with good programmed key and then turn off ignition and pull out key and...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...