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: I have bled the power steering several times and still groaning.

These power steering systems can be VERY difficult to bleed and require a vacuum be held on the reservoir before even turning the wheels or starting the engine. A special tool is required to be attached to the reservoir which...

Q: Red oil light just came on - 2010 Ford Flex

A quick "diagnosis" can be obtained by unscrewing the pressure sensor and installing an external oil pressure test gauge. YourMechanic will compare the oil pressure at idle to the factory spec., but normally at idle you should see approximately 10...

Q: Qashqai has delayed response when taking off then after few seconds it has loads of power 2011 Nissan Qasqai

Hi there - your vehicle has a relatively small engine, which is also turbocharged - an "air pump" driven by the exhaust - to provide additional power on-demand. Turbocharged engine, especially smaller ones such as your, are subject to hesitation...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.