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Geo Metro Rebuild fail perhaps?
Topic Started: Jul 20 2012, 10:17 AM (2,144 Views)
Shinrin
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Compression has been known to be considerably lower with just lifter issues.
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Woodie
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That's rings. How would oil in the cylinder fix a bad lifter?
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rtp129495
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Sorry starscream5000 I forgot to answer your question, when I initially drove the car, I drove 500 miles changed oil and then again at 1000, then 3000 miles oil change. I was gentle and not to rough when i drove it the first 500. it ran great at that time with over 40MPG each tank with a top of 45.5 MPG on a trip to arizona and 50 MPG on the way back. That changed however as soon as this problem started. I read about break ins originally and it seemed like everyone had a different method, so I was just gentle at first then adjusted slowly to normal driving.

Is that wrong? :hmm
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starscream5000
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Got 70 MPG?

If there were new rings installed into the car, then they may not be seated yet because you didn't break it in hard.

I suspect either new rings not seated, or old rings were used during reassembly.
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rtp129495
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Trifecta all across!! LOL well, sorta of, looks like 3 valves have issues!!! 3 valves, 3 cylinders :whistle ok ill stop, i dont hear laughs

I decided to do a leakdown test! my first ever. This is a VERY useful test that really reveled a lot to me. First off this is what happened.

each cylinder was tested at TDC. Air compressor regulator set to 80LBS engine warm.

Cylinder #1 absolutely NO valve leakage. some out the PCV but not signifcant (in my opinion)

Cylinder #2 slight exhaust valve leak! Blowby similar to #1

Cylinder #3 BOTH Valves leaking considerably as well as more blow out the PCV valve and Oil fill cap than #1 or #2. I can hear the leakage through throttle butterfly also, when I place my hand over exhaust pipe it presurizes and blows my hand off within 2-3 seconds :O

When I ran the car after and reved it, you can hear the sound of the air being pushed back into the intake by cylinder #3 also in the throttle body. I hadn't noticaed that becuase I hadn't listened. :(

So here i am once again, leaking valves (THAT WAS THE WHOLE POINT AND REASON IT NEEDED REBUILD THE FIRST TIME!!!) :banghead

So i ask one more time, if these valves are leaking this much, are they burnt AGAIN? did the dead/improperly installed lifters cause the burning?
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944door
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you wont know till you remove the head ........ dang it
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clarkdw


You can find out by pulling the cam and lifters. Rebuild the lifters in an hour or so and reinstall them. If you then still have the problem pull the head and your lifters are already done for you. If it fixes the problem then bublam you're done. :D

No wasted gaskets and very little labour to prove the culprit before pulling the head.

rebuilding lifters
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rtp129495
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I was thinking the same about lifters, but when I take lifters out, wouldn't testing leakdown with the lifters out show you the valves had closed once the cam and lifters were off of it? Thats another way to tell? :hmm
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clarkdw


Don't even take them out. Just loosen off the cam. :D
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rjmockster
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Well, I do know if you dont initially break the engine in properly your rings will not seat against your cylinder walls. Then a glaze forms before your rings have a chance to seat and you will leak by.
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rtp129495
Advanced Member
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Before initially Starting the motor, I looked up how to break a rebuild in, i heard anything from Run it hard and fast, to being moderate to being gentle, it seemed that everyone had a different way, so I went for the "Moderate" approuch thinking that this was a good compromise. Was this wrong? are Geos different in the "Break-in" process?
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