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cbaber 02-13-2012 02:22 PM

New guy with Civic HX
 
Hey guys glad to be here. I drive a 1998 Honda Civic HX. Its red with about 162,000 miles. Been driving it for about 1 1/2 years. I am about to replace the engine because the current one has lost compression in cyl. 2 and is running rough. I have only been getting about 34 MPG at 60 mph in the last few months. After a new engine is installed I hope to restore the car to its former glory :)

user removed 02-13-2012 05:52 PM

Before you replace the engine, do a few tests to determine exactly what is going on. Is the compression loss due to a valve problem? If so then you might consider a valve job.
In many cases the lost compression types of failures are due to blocked EGR passages, leaky intake manifold gaskets, or other vacuum leaks that make one cylinder run a lot hotter than others and cause a burned valve.

If you have tested this then ignore my advice, but a squirt of oil in the suspect cylinder and a re test of compression could tell you if the valve is your problem or the pistons-rings.

It's just cheap insurance to try to really pinpoint the problem, as well as understand the other potential causes of what has happened.

Follow a good overall diagnostic procedure, and avoid the possibility of an engine replacement that does not fix the original problem that caused the low compression on one cylinder.

Then you eliminate the risk of damage to the new engine, or damage to the same engine that has been repaired. In either case the bottom line is lower overall cost.

Welcome to the forum.

regards
Mech

mcrews 02-13-2012 05:54 PM

welcome!

Civics are great cars! 34 on a crapped out engine!
i cant get 34 on a great engine!!!

Economic Al 02-13-2012 06:59 PM

Welcome aboard.

You might have burned a valve. The engines in these cars are great and definitely worth repairing when something goes awry!

My '97 Civic Lx has over 283,000 on the original engine. Beginning to burn a little oil now but still getting great MPG!

cbaber 02-13-2012 09:12 PM

Quote:

Originally Posted by Old Mechanic (Post 286613)
Before you replace the engine, do a few tests to determine exactly what is going on. Is the compression loss due to a valve problem? If so then you might consider a valve job.
In many cases the lost compression types of failures are due to blocked EGR passages, leaky intake manifold gaskets, or other vacuum leaks that make one cylinder run a lot hotter than others and cause a burned valve.

If you have tested this then ignore my advice, but a squirt of oil in the suspect cylinder and a re test of compression could tell you if the valve is your problem or the pistons-rings.

It's just cheap insurance to try to really pinpoint the problem, as well as understand the other potential causes of what has happened.

Follow a good overall diagnostic procedure, and avoid the possibility of an engine replacement that does not fix the original problem that caused the low compression on one cylinder.

Then you eliminate the risk of damage to the new engine, or damage to the same engine that has been repaired. In either case the bottom line is lower overall cost.

Welcome to the forum.

regards
Mech

Ya it kept getting worse and worse. At first I noticed a rough idle. I did the typical tune-up with plugs, wires, cap/rotor, etc. Still ran rough at idle. Then I thought that it was weird that no CEL came on. So it turns out someone removed the CEL bulb. I had a few codes. One was for the EGR valve. Cleaned that out as well as IACV. Took care of that but didnt run better. The other code was a misfire in #2. Cleared the codes and drove to work (50 miles) and the code didnt pop up but it was still running rough. On the last part of my drive there are some stop signs. At idle it started to misfire and threw the code.

At this point im thinking its an injector or something to do with fuel. Swapped out injectors on #2. Still no luck. Finally I did a compression check. 140 psi in #1. 25 psi in #2. Put some oil in #2 and re tested. 45 psi. So now I know the rings and cylinder walls are pretty much shot with that low of compression.

mcrews 02-13-2012 09:17 PM

well, you certainly did your homework!


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