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.

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: Motor sounds

Hi There, It sounds like you may have some valve train noise as a result of the low oil that may have caused some damage. If the motor is still low on oil, this may also cause the ticking sound...

Q: What should be the total cost including labor, parts and shipping be for a low mileage engine replacement?

Billing question sent to CS for the cost to send and replace the engine in a Jeep Liberty V-6 3.7L.

Q: Rat under Hood.

Of course, you want to be sure that the noise is really from the serpentine belt and/or connected rotating elements. If you simply take all of the belt driven accessories out of the picture by removing the drive belt and...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.