Go Back   EcoModder Forum > Introductions
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-13-2012, 03:22 PM   #1 (permalink)
Master EcoModder
 
cbaber's Avatar
 
Join Date: Feb 2012
Location: Missouri
Posts: 540

Lean and Mean - '98 Honda Civic HX
Team Honda
90 day: 46.69 mpg (US)
Thanks: 30
Thanked 190 Times in 110 Posts
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

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-13-2012, 06:52 PM   #2 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,018 Times in 1,302 Posts
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
  Reply With Quote
Old 02-13-2012, 06:54 PM   #3 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 658 Times in 474 Posts
welcome!

Civics are great cars! 34 on a crapped out engine!
i cant get 34 on a great engine!!!
__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
  Reply With Quote
Old 02-13-2012, 07:59 PM   #4 (permalink)
High MPG Hopeful
 
Join Date: Apr 2008
Location: Louisville, KY
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
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!
  Reply With Quote
Old 02-13-2012, 10:12 PM   #5 (permalink)
Master EcoModder
 
cbaber's Avatar
 
Join Date: Feb 2012
Location: Missouri
Posts: 540

Lean and Mean - '98 Honda Civic HX
Team Honda
90 day: 46.69 mpg (US)
Thanks: 30
Thanked 190 Times in 110 Posts
Quote:
Originally Posted by Old Mechanic View Post
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.
  Reply With Quote
Old 02-13-2012, 10:17 PM   #6 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 658 Times in 474 Posts
well, you certainly did your homework!

__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com