Skip the auto shop - Our mechanics make house calls

Q: low compression on number 5 cylinder

asked by on

Compression is 75 and I'm pretty sure it's a blown head gasket but the car misses all the time and the plug was wet but it only smell like fuel but couldn't really tell my coolent is a little dark but not bad.

My car has 75000 miles.
My car has a manual transmission.

A: Low compression in a cylinder can be from d...

Low compression in a cylinder can be from different things. The piston and its rings, the valves leaking, a head gasket leaking, or a cam lobe worn. A broken spring for a valve may also be the problem. If you have a cylinder pressure leak down test to see where the pressure is leaking, this will tell you what is the cause of the low compression. If you want a technician to check this for you, they can look for any leaks and inspect the misfire to determine what is going on.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: My a/c blower don't blow.

The blower is under the black panel you smack every time to get it going. You may need to pull the cover off and pull the carpet back and remove a bracket and module to get access to motor. The...

Q: How do I unlock the doors using the keyless entry?

To unlock the doors with the keyless entry system, simply input the factory set entry code, or either of the personal entry codes.

Q: Engine coolant disappeared

The engine could have an internal coolant leak and the coolant is being consumed into the motor. This is is you do not see any leaks anywhere on the round or on the engine. I would recommend having a mechanic...

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...
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 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...