Skip the auto shop - Our mechanics make house calls

Q: No compression on two cylinder

asked by on

Vehicle overheated... Rebuild the heads and all the gaskets but now I have two dead cylinders cannot figure out if I am maybe you one tooth out of time or not I'm not sure but have absolutely no compression on cylinder number 2 and number 5....vehicle does run just with 4 cylinders
My car has a manual transmission.

A: Hi there: Although it’s impossible for me ...

Hi there:

Although it’s impossible for me to know without inspecting the vehicle onsite, I’m not quite certain the compression issue is mechanical here. It’s quite common after a head gasket change due to an overheating issue for the crankshaft position sensor to be faulty; which could cause ignition timing problems or faulty readings on compression sent to the ECU. There are multiple engine monitoring sensors that should all be changed anytime you remove the cylinder heads and complete major repairs. However, it’s also possible that a bent intake or exhaust valve, a leaking head gasket is causing the compression issues.

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

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: Possible electrical issue - 2008 Dodge Avenger

Hello, thanks for writing in. A battery at 45% power is a bad battery. If it takes a charge and then is back to "45%" within hours, the battery is not holding a charge correctly. There is possibly a parasitic...

Q: New motor, ran good one week but now will not start. Changed multiple sensors. It will try and start with the throttle body wide open

Hi there. The first thing you could do is check all fuses. On some vehicles, for example, the fuse to the power door lock provides power to a module that initiates a "start" signal to the PCM. Although you do...

Q: Why when the front brake pads are installed onto the rotor they sit about a 1/4 of an inch higher than the rotor?

Hello. If you are referring to the brake pads extending past the edge of the rotor, then I believe you may have the wrong brake pads, or perhaps the wrong rotors installed on the vehicle. I would verify that the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...