Honda Prelude Forum
 
Go Back   Honda Prelude Forum > Tech-Talk > 5th Gen Honda Prelude

Thread Title
High compression reading. Head gasket?

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 12-17-2011, 02:12 PM
insanodano's Avatar
Silver Member
 
Join Date: Jun 2007
Posts: 301
iTrader: (0)
insanodano is on a distinguished road
High compression reading. Head gasket?

Hi,

Just after a bit of advice. My car is showing early signs of a blown head gasket. It was over heating and I noticed bubbles on the dip stick. I've just done a compression test and there are my results:

Without open throttle
Cylinder 1 - 16 bar
2 - 16
3 - 15
4 - 16

With open throttle
1 - 18
2 - 18
3 - 17
4 - 18

So there aren't any two cylinders with low compression but I'm do think 18 bar is quite high? And I'm worried about the 3rd. Is it possible that the gasket could be blown somewhere else, and not between two cylinders?

This all started yesterday morning when my idle was bouncing from 1k to 2k every secong. And my heating wasn't working while this was happening. On the way home from work it over heated a little when idle and then continued to do so until I put about 1 ltr of water in it. (It then got hot when I was idling in traffic)

Thanks in advance
__________________
Reply With Quote
  #2 (permalink)  
Old 12-18-2011, 03:48 AM
static420's Avatar
iTell water where to go

 
Join Date: Aug 2010
Location: Planet of the rains
Posts: 1,867
iTrader: (0)
static420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond repute
Re: High compression reading. Head gasket?

If im correct, than 16 bar is 224 psi, that is very high, but i cant say its bad...
Bouncy idle says u might have a little air pocket in your coolant.
Heater not blowing warm air could be thermostat seizing, so could the overheating issue.

do thermostat test, fill rad, Bleed coolant, top off overflow and do a leakdown test to determine whether it really is the headgasket..

Last edited by static420; 12-18-2011 at 03:51 AM.
Reply With Quote
  #3 (permalink)  
Old 12-18-2011, 11:32 AM
HardKnoxBB2's Avatar
POSITION > SPEED

ROTM!
 
Join Date: Oct 2008
Location: Knoxville
Posts: 3,996
iTrader: (6)
HardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond repute
Re: High compression reading. Head gasket?

For your idle issue.
the FINAL idle problem thread!!!!!
Reply With Quote
  #4 (permalink)  
Old 12-18-2011, 11:41 AM
HardKnoxBB2's Avatar
POSITION > SPEED

ROTM!
 
Join Date: Oct 2008
Location: Knoxville
Posts: 3,996
iTrader: (6)
HardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond reputeHardKnoxBB2 has a reputation beyond repute
Re: High compression reading. Head gasket?

As for the high compression readings.
I'm curious if the tester or accurate, but it's possible you have a lot of carbon build up to cause those high readings.
Reply With Quote
  #5 (permalink)  
Old 12-18-2011, 03:41 PM
static420's Avatar
iTell water where to go

 
Join Date: Aug 2010
Location: Planet of the rains
Posts: 1,867
iTrader: (0)
static420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond repute
Re: High compression reading. Head gasket?

very very high, carbon makes perfect sense tho, would that prevent a leakdown test from being effective ? maybe seafoam it first ?

SEAFOAM DAT ISH !!
Seafoam

Last edited by static420; 12-18-2011 at 11:01 PM.
Reply With Quote
  #6 (permalink)  
Old 12-20-2011, 01:28 PM
insanodano's Avatar
Silver Member
 
Join Date: Jun 2007
Posts: 301
iTrader: (0)
insanodano is on a distinguished road
Re: High compression reading. Head gasket?

Seafoam? WHat's that? And what would cause such a high carbon build up? The compression tester is brand new from a reputable company but I suppose it could still be wrong.

And you don't think the idle could be related to the HG?

Thanks!
__________________
Reply With Quote
  #7 (permalink)  
Old 12-20-2011, 02:44 PM
static420's Avatar
iTell water where to go

 
Join Date: Aug 2010
Location: Planet of the rains
Posts: 1,867
iTrader: (0)
static420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond repute
Re: High compression reading. Head gasket?

Quote:
Originally Posted by insanodano View Post
Seafoam? WHat's that? And what would cause such a high carbon build up? The compression tester is brand new from a reputable company but I suppose it could still be wrong.

And you don't think the idle could be related to the HG?

Thanks!
one of the simplest things that'll cause carbn buildup is using less octane fuel than is prescribed for your car, would u eat 87 food? or 91? ok, the next thing is the FITV, that keeps your rpms high when u startup the monster, we want rpms high for a few reasons, sounds better when cold, so it wont bog or be erratic, heater core will heat up quicker when u are cold (brr), and lastly but really, the engine hates burning that cold s*** and doesnt seem to fully get through it, so when your engine is not burning through all the fuel u are leaving deposits in the form of carbon all around your valve heads and seats. Which is why when u are starting a cold car, never let it sit there and warm up for 5 minutes (maybe that hangs around from the days of carb'd cars) thats useless, instead, just go drive asap, and let her warm up smoothly, but never push or redline cold engines, just get it warmed up quick, and it wont have a chance to leave such deposits. Engines hate idling.
Vehicles that sat in traffic much of their lives (like in L.A.) I can imagine would have alot more buildup inside than a highway driven vehicle.
Have u ever pulled your spark plugs to see if they look like poop ? that could also tell u in which cylinder there may be a problem.

Seafoam is just a nice cheap tool to clean out alot of gunk from your engine and injectors without having to dismantle anything. Use it as your keyword in a u-tube search and you will see. But i'm thinking u should use it first and then do the compression and leak down test.
EDIT: i can also imagine that poor/no filtration could cause tons more gunk.

Quote:
Originally Posted by insanodano View Post
And you don't think the idle could be related to the HG?
Thats what i mean, a leak down test will sort it all out for u, before u go ripping out a HG.... pricey stuff (but in short, yes, bad HG CAN and WILL affect idle, because 1 or 2 cylinders would lose compression, car would vibrate too.

Do u have any moisture in your engine oil ? bubbles etc. also bad HG may emit white, sweet smelling smoke from exhaust i think.


man here's a vid explaining the leak down, i hope i dont get into s*** for all the vids i put here... mods, lemme know if its not cool

Last edited by static420; 12-20-2011 at 06:24 PM. Reason: remember to change spark plugs after seafoaming
Reply With Quote
  #8 (permalink)  
Old 12-22-2011, 05:07 PM
insanodano's Avatar
Silver Member
 
Join Date: Jun 2007
Posts: 301
iTrader: (0)
insanodano is on a distinguished road
Re: High compression reading. Head gasket?

In the UK we have higher octane in our fuels I think. The minimum we have is 95. I've had a good read of the "idle thread" and I'm gonna check the FITV.

I've got new plugs and they're pretty dirty considering their age, actually. So I've ordered some of that and I'll give it a go then retest the compression.
__________________
Reply With Quote
  #9 (permalink)  
Old 12-22-2011, 05:17 PM
playludesc's Avatar
Junior Member
 
Join Date: Nov 2011
Location: Fort Collins, CO
Posts: 73
iTrader: (1)
playludesc has a reputation beyond reputeplayludesc has a reputation beyond reputeplayludesc has a reputation beyond reputeplayludesc has a reputation beyond reputeplayludesc has a reputation beyond reputeplayludesc has a reputation beyond reputeplayludesc has a reputation beyond reputeplayludesc has a reputation beyond reputeplayludesc has a reputation beyond reputeplayludesc has a reputation beyond reputeplayludesc has a reputation beyond repute
Re: High compression reading. Head gasket?

The U.K. uses a different measurement.

Educate Thyself
__________________
BECAUSE PRELUDE
Reply With Quote
  #10 (permalink)  
Old 12-22-2011, 06:01 PM
static420's Avatar
iTell water where to go

 
Join Date: Aug 2010
Location: Planet of the rains
Posts: 1,867
iTrader: (0)
static420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond reputestatic420 has a reputation beyond repute
Re: High compression reading. Head gasket?

compression compression compression.... leakdown tests are what works...
your plugs could be dirty from either bad valve seals or piston rings..
endless compression tests will have u running in circles bro, leakdown tests ftw !!
__________________

Quote:
Originally Posted by Sideswipe SI View Post
Youth is truly wasted on the young
Reply With Quote
  #11 (permalink)  
Old 12-28-2011, 01:11 AM
Silver Member
 
Join Date: Nov 2011
Location: Chattanooga, TN
Posts: 408
iTrader: (1)
rjschmon is on a distinguished road
Re: High compression reading. Head gasket?

That leak down video is great!!! Going to go do a compression test tomorrow and I am praying that my engine is in good shape.
Reply With Quote
  #12 (permalink)  
Old 12-28-2011, 04:28 PM
Nusdogg's Avatar
Silver Member
 
Join Date: Dec 2009
Location: St. Paul, MN
Posts: 311
iTrader: (0)
Nusdogg has a reputation beyond reputeNusdogg has a reputation beyond reputeNusdogg has a reputation beyond reputeNusdogg has a reputation beyond reputeNusdogg has a reputation beyond reputeNusdogg has a reputation beyond reputeNusdogg has a reputation beyond reputeNusdogg has a reputation beyond reputeNusdogg has a reputation beyond reputeNusdogg has a reputation beyond reputeNusdogg has a reputation beyond repute
Re: High compression reading. Head gasket?

Leak Down test is your best friend for this kind of work.
__________________

Quote:
Originally Posted by JSA Motors View Post
The H22 wakes up the Accord in the same way a set of secondaries did to your father's Oldsmobile.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
High compression reading insanodano DIY Engine 1 12-17-2011 02:12 PM
cometic head gasket, arp head studs... on a stock h22. need opinions! HpreludeH Forced Induction 4 03-31-2011 12:19 PM
high compression turbo Andrei 5th Gen Honda Prelude 6 01-28-2011 11:40 PM
Speedometer reading too high WERD General Tech Talk 8 05-08-2008 08:28 AM


All times are GMT -4. The time now is 08:19 AM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors


Copyright © 2006-2009 PreludeZone.com All Rights Reserved.