Q: Drop in engine compression.
I think I have lost compression in the motor.
Loss of compression in an engine is a serious problem that usually results in a complete engine rebuild or replacement. Since this is a big job to diagnose, it is very important you have a certified mobile mechanic look over your Altima before any drastic moves are taken. A mechanic will be able to perform what is known as a compression and leak down test on your vehicle. This will determine if indeed your car does have low compression and if so the leak down test can tell us why this is happening.
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
What does the forward collision alert (FCA) Warning Light mean?
The forward collision alert (FCA) system is a key safety feature in your vehicle that helps alert you when you are rapidly approaching a vehicle. The FCA Warning Light is located in the middle of the instrument panel. The FCA...
Faint pulsating sound during idle
If the noise you are hearing is coming from the dash area then you may be hearing the blend door electronic actuator controlling the temperature output to the vents. Try to turn off your a/c or heater controls and see...
Pressing on gas pedal, car loses power - 2010 BMW 335d
Excessive soot and carbon (pre-maturely) from the EGR system is most likely clogging up the intake system, throttle body, etc. Although the dealer is supposed to be responsive, if you are having further issues, or would like a second opinion,...
Went to take the gas cap off and it blew air out.
Excessive pressure inside the fuel cell could be caused by a clogged EVAP canister (https://www.yourmechanic.com/article/how-to-replace-an-evaporative-emission-control-canister-by-timothy-charlet). This system is designed to filter vapors from the fuel tank for environmental reasons. If the canister is full or the purge solenoid is damaged...
Failure code P0750
Hey there. The code P0750 (https://www.yourmechanic.com/article/p0750-obd-ii-trouble-code-shift-solenoid-a-malfunction-by-spencer-clayton) pertains to a shift solenoid. I would clear the code and test drive the truck while monitoring the shift solenoid's values and operation. Afterwards recheck for the code, stored or pending. Perform a battery...
Why does my car give a kick back?
Hi there. The most common thing that I have seen that causes this on your vehicle is a bad engine mount. When one of these fails the engine can move when it is started or when shifting gears. When this...
Oxygen sensor issue - 3.8LT V6 P0151 voltage low bank 2 sensor 1 2004 Holden Commodore
Hello - the P0151 code (https://www.yourmechanic.com/article/p0151-obd-ii-trouble-code-o2-sensor-circuit-low-voltage-bank-2-sensor-1-by-jay-safford), as you have noted. Assuming the new O2 sensor is a good one, the problem could be faulty wiring to the sensor, an air leak in the intake, or a malfunctioning Mass Air Flow...
There's a lawn mower sound coming from my engine when I'm driving
The noise could be due to an exhaust leak although it is also possible that a failed wheel bearing could cause enough "rumbling" to sound really loud. If you request a vehicle noise diagnostic (https://www.yourmechanic.com/services/car-is-making-a-noise-inspection) the origin of the noise...
What happens when the air condition stops and the check engine light comes on
Hello. There are multiple possible sources of this problem, ranging from a pulley or belt that has been damaged, to a sensor failure or electrical malfunction. The check engine light will be triggered by a trouble code that will probably...
Related articles
How Does a Radiator Keep an Engine Cool?
Car radiators cool off your engine and prevent your engine from overheating. Coolant absorbs engine heat and dissipates it through the radiator.
A Buyer’s Guide to the 2012 Nissan Altima Hybrid
The The Nissan Altima is already a favorite among mid-sized sedans, but it gained even more points with a lot of car buyers with the option to buy a 2012 Nissan Altima Hybrid. Though the four-cylinder Nissan Altima was already...
3 Essential Things to Know About Your Car’s Temperature Gauge
A car temperature gauge shows how hot the engine is. If the temperature gauge reads high, your car could be leaking coolant or have a bad water pump.
Browse other content
Estimates
Services
Maintenance