Q: low compression on number 5 cylinder
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.
Recommended Services
| Engine is misfiring Inspection | $94.99 - $114.99 | Get a Quote |
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.
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
Car jerking while driving
If the transmission is not shifting gears even after a fluid service, the problem may be internal transmission failure. I do not suggest driving a vehicle with these symptoms as you risk damage to the engine. You will need to...
Car vibrates/shakes when sitting still in idle (in gear or in neutral).
This sounds as if you have a low idle condition. I can say your car isn't likely to suffer a catastrophic failure because of this. With a condition such as this, it is normal for it to run rougher (https://www.yourmechanic.com/services/car-idle-is-rough-inspection)...
Air vents cannot turn off on 2006 BMW 530xi
Hello. The issue you are experiencing with your 2006 BMW 530xi is likely from a faulty blower motor (https://www.yourmechanic.com/services/cooling-radiator-fan-motor-replacement), faulty blower motor resistor (https://www.yourmechanic.com/services/cooling-fan-resistor-replacement) or a faulty blower motor control switch (https://www.yourmechanic.com/services/ac-control-switch-replacement). If left on for too long, yes, it...
Warning lights come on while backing down a hill, Infiniti G25
There is a short somewhere causing the lights to work intermittently. However, to provide more insight as to where the short might be, I would need to know exactly which lights are illuminating intermittently. I'm guessing that it is not...
Low rpm & stalling
This is often times related to what is called an idle air control module which regulates the air flow at idle as the air enters the intake system and is mixed with fuel before being injected into the motor. When...
I got my RPMS too high before shifting into third gear. Is it possible that I blew the cam seal?
Hey there. The engine computer will limit the maximum RPMs your engine will go before it limits it from over revving. This limit will feel like a sudden loss of power with the power then coming back. Revving the engine...
Can a car jump start with a bad fuel pump?
Jump starting due to a bad battery will not make a bad fuel pump start working. I would recommend replacing a bad battery and then doing a thorough diagnosis of the fuel system to diagnose the fuel pump not working....
Car jerking often, check engine light flashed and stayed on.
What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement) monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital...
I have a 97 jeep Cherokee thats has been running rough. It smells like gas when I drive for awhile and then this morning after dri
From your description, the cylinders are being oversupplied with fuel. If the fuel trims (from a scanner) are high negative, for sure there is too much fuel and a diagnostic would be required to determine why. Just as an example,...
Related articles
Top 10 PZEV Cars for Eco-Friendly Drivers
Teddy Leung / Shutterstock.com The whole idea of a PZEV (that is, a partial zero-emissions vehicle), seems paradoxical. You’d think it’d have to either be zero-emissions or not in the category at all. But as contradictory as...
2012 Ford Fusion vs. 2012 Toyota Camry: Which Should I Buy?
While most people believe that domestic sedans just cannot compete with the Honda Accord and the Toyota Camry, the industry leaders, that is not necessarily true. Yes, there are some metrics where the Camry just excels, however the Ford Fusion...
The Best Used Cars to Buy If You Just Retired
Here’s Here’s a cruel, hard fact – car manufacturers no longer target seniors. Instead, they devote their time and energy to appealing to the 18-45 demographic. Still, some features make certain cars more suitable for older drivers. We have evaluated...
Browse other content
Maintenance
Cities