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Old 01-24-2010, 01:24 PM   #1
bingles
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Default Low Compression on all cylinders whats wrong?

Hello Everyone,

about 6 months ago I installed a fully rebuilt head on my dads 1989 civic 1.8l (i think). Everything worked great passed timing has been running like a champ for my dad. Then during a really bad winter storm we had he said he started it up it ran, he moved it, it sat now it won't start. I did a compression test and its about 30psi on all plugs. So I thought timing was screwed, pulled timing belt it was dead on. Put timing belt back on and still bad compression. Can anyone point me in the right direction?

Had plenty of antifreeze so I don't think it cracked, but not sure what I should check. If rings were bad why would it start then not start few days later? After I did the new head it had about 130 to 150psi accross the pistons now its 30psi.

Thanks

Brian
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Old 01-24-2010, 01:41 PM   #2
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Default Re: Low Compression on all cylinders whats wrong?

Here is a picture of how I did the timing with #1 at TDC
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Old 01-24-2010, 04:52 PM   #3
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Default Re: Low Compression on all cylinders whats wrong?

A leakdown test would/should tell you what's going on internally.

130-150psi seems on the low side so maybe there was a problem prior to the head swap and it's just now become enough of a problem to prevent the car from running.
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Old 01-24-2010, 05:07 PM   #4
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Default Re: Low Compression on all cylinders whats wrong?

I guess I am going to have to do some searching, I have never done a leak down test. I hope I don't have to buy expensive tools. Don't get me wrong I love tools and I love to learn new tests.. LOL

I am wondering if it has burnt valves or something? but would they all go at once? Same with the rings do they normally all go at once? I was expecting to find a few real low compression cyl and a few normal not all at or below 30psi. It behaves as if valves are open on compression stroke which I dont see how that can be when all the timing is perfect.

Well I most certainly thank you for the leakdown test suggestion and will check into what I need to buy.

Brian
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Old 01-24-2010, 05:13 PM   #5
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Default Re: Low Compression on all cylinders whats wrong?

http://www.superhonda.com/forum/f49/...n-test-257985/

I just found a excellent step by step on how to do leak down test, now all I got to do is buy the tool. Still seems wierd all cylnders went at same time

Brian
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Old 01-24-2010, 08:32 PM   #6
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Default Re: Low Compression on all cylinders whats wrong?

How can I do a leak down test with out warming up the engine first?
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Old 01-24-2010, 08:49 PM   #7
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Default Re: Low Compression on all cylinders whats wrong?

This Compression test was done on a Cold Engine since it wont start but 30 t0 35 psi still seems way to low even if it is cold. Also the battery wasn't the best. I have it charging and will test again tomorrow.

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Old 01-24-2010, 08:58 PM   #8
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Default Re: Low Compression on all cylinders whats wrong?

even on a cold engine30-35 is extremely low, when u changed the head what kind of head gasket did u use? And when u had the head work done were quality parts used?
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Old 01-24-2010, 10:03 PM   #9
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Default Re: Low Compression on all cylinders whats wrong?

Fel-pro gasket it wasn't a cheap one thats for sure, All head work was done performance machine shop, new valves, surfaced head, seals, the works. My dad wanted it done with good parts, so thats what I got him. This whole thing really confuses me because he said it ran fine moved it now it won't start. Correct me if I am wrong but if it was a head gasket wouldn't one or 2 cyl have low compression, not all equally real low? Only other thing I can say is its been sitting for 3 weeks because I been busy.
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Old 01-24-2010, 10:06 PM   #10
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Default Re: Low Compression on all cylinders whats wrong?

yes on the head gasket thing, unless it was some shitty one and it just disintegrated, thats what happened with my exhaust gasket.
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Old 01-24-2010, 11:15 PM   #11
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Default Re: Low Compression on all cylinders whats wrong?

I have seen this multiple times. I am willing to bet you have carbon deposits keeping your valves open. You need to get a solvent based product like "GM Top Engine Cleaner" or Seafoam and with the plugs out fill the intake and cylinders and in anyway you can get the stuff on the valves, let it soak for a while, then crank the engine over for a while to loosen the gunk up that is on the valves, then put the plugs back in, change the oil and try and start it, it will most likely still take a lot of cranking, then slowly come back to life. My self and a few of my friends have resolved a problem vary similar to yours using this procedure. I would at least check it out.
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Old 01-25-2010, 05:59 AM   #12
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Default Re: Low Compression on all cylinders whats wrong?

Quote:
Originally Posted by bingles View Post
Here is a picture of how I did the timing with #1 at TDC
that camshaft timing is correct if the engine is a D15B1 or D15B2 - it is not correct for the D16A6 engine - D16A6 cam gear has a mark at about 7 o'clock which lines up with the pointer on the inside back timing belt cover - the two marks at 3 o'clock and 9 o'clock won't be used and won't line up with anything
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Old 01-25-2010, 07:03 AM   #13
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Default Re: Low Compression on all cylinders whats wrong?

did you floor the gas pedal while you where cranking it? unplug the main relay?
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Old 01-25-2010, 09:04 AM   #14
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Default Re: Low Compression on all cylinders whats wrong?

I am pretty sure its the stock D15 type engine.

No I didn't floor the gas peddle, I will try that today.

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Old 01-25-2010, 09:19 AM   #15
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Default Re: Low Compression on all cylinders whats wrong?

besides that I timed it this same way when I did the head last spring, and it passed smog and timed perfect on timing light.
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Old 01-25-2010, 01:09 PM   #16
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Default Re: Low Compression on all cylinders whats wrong?

You should find out what motor it is because up top you said 1.8 and the old civics like ours never came in a 1.8 variant.
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