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Old 08-26-2015, 04:23 PM   #1
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Need advice

I took my car to a different mechanic to get a once over as I'm taking a trip across the country. He informed me it has blowby or blowack( whichever) apparently taking the oil filter off there's air coming out. I got it home and did the same with the oil fill cap. As soon as I took it off it had air coming out. Mechanic seems to to think, rings at the minimum . What else could this mean. I'd just had the head redone a month or so ago. Do you think it could be any thing to do with the head work.?


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Old 08-26-2015, 07:27 PM   #2
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Usually not a great sign, but if you PVC is not flowing you could get some pressure in the crank case. A compression check is the best way to check the cylinder.
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Old 08-26-2015, 07:29 PM   #3
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And find another mechanic...
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Old 08-26-2015, 09:03 PM   #4
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Personally, if the car seems to be running right and no light are on, I wouldn't worry about what the mechanic said. It sounds like a whole lot of baloney to me.
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Old 08-26-2015, 09:21 PM   #5
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Alright I'll definitely take it to another place. Ive never heard one bad thing about this current shop. He said he thought the rings were going bad allowing the exhaust gasses to pass thru. Idk much about motors( unless they're electric , I'm an electrician). I use this site regularly and find it very useful, and figured I'd get some feedback on this.
I've got bad luck with mechanics around here. Three months ago the last mechanic bent some valves in the head. I brought it in for a new belt and it slipped off. In his defence, I got everything done free of charge plus a few more things. CV axles ,bearings ,calipers and rotors
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Old 08-26-2015, 11:16 PM   #6
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"oil filter off" doesn't add up - might mean air filter.

Breather to air filter box should only have a small amount of oil/vapor coming out normally as long as the PCV valve/hose is working right/clear.

If you get a lot of "blowby" coming back into the box and the system is otherwise OK that does indicate the tings/pistons/cylinders could be worn.

As mentioned earlier, a compression test is the basic one to give you an idea of where you stand on engine condition with a leakdown test being a more advanced version for diagnosis if the compression test is bad.


Pulling off the fill cap while running always makes a mess from air/oil puffing out, hard to diagnose anything from that unless it's really smoking.
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Old 08-27-2015, 08:39 AM   #7
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Alright I'll get a compression tester on the way home from work. The car runs fine. My main concern is taking it on the trip and breaking down in the middle of nowhere.
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Old 08-27-2015, 10:10 AM   #8
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Do a compression test to put your self at ease and to make sure , Saying that anyone with a SVT or Zetec goes out and takes the oil filler cap off will get a LOT of air moving out , this is very normal and they all do it , to me it sounds like your Mechanic is full of BS , I would ask him if he sells you another engine is he going to guarantee you that air wont be coming out with the new engine and if it does you dont have to pay the bill ????

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Old 08-27-2015, 05:44 PM   #9
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Just got done with the compression test. 3 or the 4 were right around 90. One on the driver's side read 80. After reading in some somewhat related threads I feel those numbers are within reason. Is the fact that one is ten lbs lower than the others show that that would be my culprit?
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Old 08-27-2015, 11:17 PM   #10
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10% variation is acceptable, so it's not looking bad that way.

Absolute numbers are harder to figure, gauges can vary and even more it's affected by how you do the test.

Throttle open or closed, how long you crank it (small number of turns, crank until the pressure stops rising) just how it's done can change the numbers quite a bit.

SVT has lower numbers than you'd otherwise think normal from the low speed cam timing. IIRC 120 is about the max. from the highest typical pressure method (throttle open, crank until it stops rising). That would only be fair on many other types.
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