91 civic special edition 1.5 liter no compression?
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Honda-Tech Member
Joined: Jun 2004
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From: Calgary, AB, Canada
91 civic special edition 1.5 liter no compression?
so a friend dumped off a 91 civic special edition 4 door sedan at my house and he said that he wanted to me to see if I could fix it.
I'm quite confident that I can repair it but I would like some insight from other honda pros from HT.
I measured the compression on all cylinders after the motor warmed up to operating temp.
cylinder 1 = 180 psi
cylinder 2 = 185 psi
cylinder 3 = 0 psi (that is no typo there is NO compression whatso ever on this engine)
cylinder 4 = 180 psi.
what the heck would cause this 1 cylinder to have zero compression??
The motor still starts but obviously runs like crap.
please tell me its a simple fix like a cylinder head swap. The car has 330, 000km's and its in great shape.
My friend even said that I can have the car if it will cost him too much money to fix.
I highly doubt that its a damaged piston and I'm sure the connecting rod is still in tact since it would make an awful noise if it broke.
suggestions?
I'm quite confident that I can repair it but I would like some insight from other honda pros from HT.
I measured the compression on all cylinders after the motor warmed up to operating temp.
cylinder 1 = 180 psi
cylinder 2 = 185 psi
cylinder 3 = 0 psi (that is no typo there is NO compression whatso ever on this engine)
cylinder 4 = 180 psi.
what the heck would cause this 1 cylinder to have zero compression??
The motor still starts but obviously runs like crap.
please tell me its a simple fix like a cylinder head swap. The car has 330, 000km's and its in great shape.
My friend even said that I can have the car if it will cost him too much money to fix.
I highly doubt that its a damaged piston and I'm sure the connecting rod is still in tact since it would make an awful noise if it broke.
suggestions?
Honda-Tech Member
Joined: Sep 2004
Posts: 401
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From: Cincinnati, OH
Well, 0 compression means 100% of the air is escaping from the cylinder. So.. hole in piston, completely eaten valve? Either way, it's not going to be pretty. I'd line up a different motor to install in that puppy.
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Joined: May 2004
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From: Oak Ridge, TN, USA
Re: 91 civic special edition 1.5 liter no compression? (stevescivic)
That's usually a burnt exhaust valve. put the cylinder on top dead center compression stroke and blow some air into it and listen where it comes out. If it comes out the exhaust=exhaust valve comes out the air filter than an intake valve if it comes out the crankcase=burnt piston
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Joined: Jan 2006
Posts: 517
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From: ny, ny, usa
Re: 91 civic special edition 1.5 liter no compression? (Super Chicken)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Super Chicken »</TD></TR><TR><TD CLASS="quote">That's usually a burnt exhaust valve. put the cylinder on top dead center compression stroke and blow some air into it and listen where it comes out. If it comes out the exhaust=exhaust valve comes out the air filter than an intake valve if it comes out the crankcase=burnt piston</TD></TR></TABLE>
Yes, this is true, the leak down test will pinpoint where the damage has occurred.
Yes, this is true, the leak down test will pinpoint where the damage has occurred.
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Joined: Feb 2006
Posts: 1,278
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From: Portland, OR, USA
Re: 91 civic special edition 1.5 liter no compression? (Super Chicken)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Super Chicken »</TD></TR><TR><TD CLASS="quote">put the cylinder on top dead center compression stroke and blow some air into it and listen where it comes out. If it comes out the exhaust=exhaust valve comes out the air filter than an intake valve if it comes out the crankcase=burnt piston</TD></TR></TABLE>
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