Q: 1 cylinder is down on compression 2005 Subaru Legacy

asked by on December 06, 2016

Was just told that I have 1 cylinder firing at 90, all others are up around 140-150. Is the engine done or can a cylinder be fixed/

My car has 70000 miles.
My car has an automatic transmission.

Loss of power Inspection $79.99 - $89.99 Get a Quote

Hello - there are several possible causes of low compression on 1 cylinder only. Causes include: burned valve, worn piston rings (not common for a single cylinder), worn camshaft lobes (not allowing full air charging of the cylinder), valve adjustment too tight (leads rapidly to burned valve). I would recommend an engine inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

Starting problem - 2005 Hyundai Tiburon

Hello and thank you for contacting YourMechanic. Check the mass air flow (MAF) sensor for any debris or if it has a bad connection. If the sensor is dirty, clean the sensor, and put it back on. If the sensor...

The car loses acceleration intermittently

Hello. It would be recommended to have the vehicle looked at by a certified mechanic. They should have the specialty tools and techniques to identify the problem and repair the situation correctly, and avoid any damage or injury. This could...

I have a clicking noise that comes from the clutch area

This is probably not good news, but if you have a noise that you can change by stepping on the clutch pedal, then you likely have a problem in the clutch. A clicking that goes away when you step on...

transmission question

The transfer case has its own separate oiling system and does not share fluids with the transmission. The transmission may be having a problem with sucking air from a leak in the valve body or a front pump of the...

Clutch pedal gave way

Hello. If the clutch pedal has gone to the floor and will not build pressure then most of the time this is caused by a bad clutch master cylinder. I would start by checking the fluid in the reservoir. If...

Running lights and tail lights stay on when the engine is off and the key removed

Hello. It sounds like your time delay in the control module is not working. It may also be a short in the switch but that is not as likely. The retained power relay may be failing or the control module...

Can't roll up one window

The window regulator and motor are the most likely causes of the window not going down. If you hear the motor running, but the window does not move, then the regulator is broken. If you do not hear the motor,...

About how many hours does it take to change a timing belt on a 2005 Acura MDX? I'm just trying to figure out how much the labor is

Claimed by Tim Charlet

After jump start why is check engine light on?

When the battery light comes on, this may indicate you may have a faulty alternator or a weak battery as a result of the alternator not properly charging the battery. I would suggest having a professional from YourMechanic come to...

Related articles

A Buyer’s Guide to the 2013 Subaru BRZ
This This sports car for the everyday man or woman is an irresistible combination of style, handling, and just plain fun. The BRZ offers a respectably good time on the way to work or on the way around the race...
The Best Used Cars to Buy for Families
If If it’s time for you to search for the top used cars specifically for families, check out the list we’ve put together of the top five. The list of must-haves Typical items that families are looking for in their...
2007 Nissan Versa vs. 2007 Saturn Ion: Which One Should I Buy?
Compact cars as a class are generally meant to be commuter vehicles: with excellent gas mileage, an entry-level price point, and decent safety ratings for those who are on the road the majority of their time. These cars also make...