Skip the auto shop - Our mechanics make house calls

Q: Overheating

asked by on

Okay so today I did the compression test on the car and I'm kinda scared and stumped at the same time most of the cylinders where about 130 to 135 and the 2 on the the front cylinders 1 and 3 where 120 the first time I did the test and I let then sit for a couple minutes but I did the test again and cylinder 1 got to 135 and held it and cylinder 3 would only get to about 125 I also looked for bubbles coming through the radiator and nothing from any of them when I took out the spark plugs they looked good on the front head and the back ones looked kind of oily when I took the 2 cylinder the first one for the rear head it was kind of hard to get out and looked like it was burning coolant and smelled odd and different from the rest the other ones the rest smelled like gas I thought it was a head gasket leak because the symptoms are the car will run good for a couple of days after I bleed the air out of the system and after like after 3 days it will overheat again and it bubbles at overflow

My car has 110000 miles.
My car has an automatic transmission.

A: When you put pressure in the radiator you a...

When you put pressure in the radiator you are only going up to about 15 psi, but when a cylinder fires, it puts out a lot more than the compression test showed at 125 psi. This is why you are only getting pressure in the radiator while running the engine. You most likely have a blown head gasket on the cylinder number two. When you remove the intake manifold and heads on both sides, check the corners to see if the head and intake is not rotted away and needs replacement. Your compression looks pretty good so you have good pistons. Your best bet may be to have a trained professional come to your car’s location to pinpoint the fault in person and diagnose the cause of the overheating issue.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: f250 5.4 v8 automatic 4x4. It spit a spark plug in a cylinder and still runs just misses. Shop is asking 4500. What damage can it cause and how much to fix it?

If the spark plug is spitting out, then the threads in the cylinder head or on the spark plug have been stripped out. Check the spark plug if you still have it and see if its stripped. If the plug...

Q: My car cranks and seems to fire once but won't start - 1991 Toyota Tercel

Hi there. From the description you have provided, these symptoms need to be properly diagnosed. Replacing parts, without diagnoses, can be expensive and time consuming. Assuming the engine is mechanically sound, the description you provided about the spark plug condition...

Q: Stereo system wiring

Hi! If the reflector is broken it would be best to have a technician inspect it to see exactly which part is broken. Usually a broken tail light will have to be replaced but at times they can be repaired....

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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 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.