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Low Compression, need some help

 
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Old 01-14-2011, 04:09 PM
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Low Compression, need some help

Well this is my first post so now I can read the DIY guides.

I have an 01 with 170K and stock internals.

The problem I have is hard cold starts and cold idle issue. Since I burn a lot of oil I thought to check my compression and it is really low, 110-80-80-165.

What are the possible causes of it being like this? Other than rings I was thinking maybe a head gasket since 2 and 3 read the same but not sure if that will affect the excessive oil burn. Is that common on a h22a4?

I don't have a leak down tester so I can't give any of that info. I was going to do a valve adjustment to see if that helps.

Thanks
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Old 01-14-2011, 09:32 PM
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Re: Low Compression, need some help

possible chance in head gasket but burning oil usually means rings or even valve stem seals!!
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Old 01-14-2011, 10:08 PM
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Re: Low Compression, need some help

piston rings, or valves. but replacing piston rings should bring up compression ratio but the car will still burn oil sinces its a h22...
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Old 01-15-2011, 01:13 AM
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Re: Low Compression, need some help

squirt a bit of engine oil into cylinder and redo the compression check, and see what the results are, if higher then its your rings, if same than possibly your head gasket, maybe a crack between 2 and 3.
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Old 01-19-2011, 12:32 AM
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Re: Low Compression, need some help

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Originally Posted by fezz_tec View Post
squirt a bit of engine oil into cylinder and redo the compression check, and see what the results are, if higher then its your rings, if same than possibly your head gasket, maybe a crack between 2 and 3.
Agreed, this is what I would do. Man those middle two numbers are horrible you sure you had a good tight gauge sometimes the gauges you get from autozone on the loaner tool program are crap and leak like crazy and give you bad results. Plus it helps to have a friend to crank the car while you write the numbers down as they do backoff a bit.

I have 160,000 on my 97 base and my results were
198, 210, 210, 209 or close to that the lower cylinder was in cylinder 1 but it was due to a valve seating problem (carbon build up)

Drip a few drops of motor oil down thru the spark plug holes, let it stand for about 10 minutes or so and try the compression test again if it come up a great deal then I would say it is definetly the rings.

I had a 87 Supra way back in the day and I had the head gasket blow on cylinder 2 into the water jacket. I was leaving the motorpool at Ft. Bragg and notice a cloud of white smoke out the exhuast and shut it down right away. I towed it home for a four day weekend and torn the head off sent it to the machine shop had the whole valvetrain done shaved the head (port and polish) and decked the motor, replaced head gasket with a metal one and bam, wow what a difference. I had to leave the car and come back once the head work was finished to put it back on.

Let us know after you try the oil thing.

Last edited by Rob; 01-19-2011 at 12:40 AM.
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Old 01-20-2011, 02:07 PM
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Re: Low Compression, need some help

If two cylinders next to each other are very low, its most often a leaking head gasket. A leakdown test would tell you for certain. Other than that, you're just pissing in the dark.
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Old 01-20-2011, 10:08 PM
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Re: Low Compression, need some help

Im also having low compression readings with my H22a4. My car has around 203,000 miles and it burn oil like a cigarette. I have to check the oil every week my reading were around 115,125,112 and 120 so im guessing my rings are toasted. The new engine will be coming soon though. JDM H22a here we go....
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