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...

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

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・Save up to 30%

Get a quote

What others are asking

Q: My oil pressure gauge read high with lights on

There is possible a loose or bad ground to the instrument cluster or possible within the cluster itself. Check the connector to the cluster as well as any ground wires you can find. The connectors come from behind the instrument...

Q: Won't start

Hi there: In many cases when you turn the ignition and you hear a single click, it's due to the battery not having enough cranking amps to activate the starter motor. The power required to activate the starter is much...

Q: Engine is difficult to start, it frequently dies and it takes several attempts to keep it running normally

There are many potential causes for your problem. There is a recall for the fuel pump, which indicates that this is a common problem. It's recall #220, and may be covered by Volvo if your VIN is on the list...

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...