Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > Generation III Internal Engine
Sign in using an external account
Register Forgot Password?
Search

Generation III Internal Engine
1997-2006 LS1 | LS6
Sponsored by
Texas Speed & Performance

Welcome to LS1Tech.com!
Welcome to LS1Tech.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join LS1Tech.com today!


Reply
 
Thread Tools Search this Thread
Old 10-14-2002, 08:40 PM   #1
TECH Regular
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2001
Location: Madison Heights, MI
Posts: 410
Default What would cause no compression in one cylinder

I know a valve stuck open and I guess bad rings but what specificaly would hold a valve open or make rings go bad. I only threw a multiple misfire code and I don't hear any ticking or anything, but the dealer says no compression.
__________________
SOLD: 2001 T/A WS6 A4 Black/Black. TCI 3000, TR224, ARE Stage 2.2 Heads, Corsa Catback
1975 Porsche 914, Chevy Transplant
SOLD: 2003 Trailblazer. Almost stock
2006 Chevy HHR 2LT
Nick's WS6 is offline   Reply With Quote
Old 10-14-2002, 08:48 PM   #2
wrencher
Garage is empty, add now
 
wrencher's Avatar
 
Trader Rating: 2
Join Date: Aug 2002
Location: Chicagoland
Posts: 4,768
Default Re: What would cause no compression in one cylinder

Burnt valve,broken valve, valve not seating,hole in piston generally anthing that lets air escape combustion chamber. They need to do a leak down & see what the problem is.
wrencher is offline   Reply With Quote
Old 10-14-2002, 10:14 PM   #3
Staging Lane
Garage is empty, add now
 
Trader Rating: 0
Join Date: Dec 2001
Location: Bay Area, CA
Posts: 83
Default Re: What would cause no compression in one cylinder

Don't forget bent valve... Most common reason a valve won't seal, especially on these engines. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Please don't ask how I know this! <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />
Black Magic is offline   Reply With Quote
Old 10-14-2002, 10:40 PM   #4
FormerVendor
Garage is empty, add now
 
Redline-Motorsports's Avatar
 
Trader Rating: 3
Join Date: Aug 2002
Location: Albany, New York
Posts: 622
Default Re: What would cause no compression in one cylinder

Hole in the piston! What happened? Give us some details!!!!
Redline-Motorsports is offline   Reply With Quote
Old 10-15-2002, 07:04 AM   #5
TECH Regular
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2001
Location: Madison Heights, MI
Posts: 410
Default Re: What would cause no compression in one cylinder

Well I was just driving normal and the car started to run real rough but no backfires and no noise. Then the ses light started flashing. I pulled over and hooked up the autotap and one code was there, p0300 multiple missfires. I drove it the rest of the way home about 2 miles and I let it sit overnight. The next morning I turned it on and it was still running bad but no codes. I even had all 8 misfire windows up and not a cingle one. I checked all the sensors,wires and couldn't find anything wrong. I did find a plug for the wideband tuning was halfway out but it still ran the same after I screwed it in all the way. So off to the dealer. On the way there the ses light was flashing again but still no backfires or funny noises, dealer looked at it all day and says I have no compression in one cylinder. Today they are going to tear it apart to see whats broken.
__________________
SOLD: 2001 T/A WS6 A4 Black/Black. TCI 3000, TR224, ARE Stage 2.2 Heads, Corsa Catback
1975 Porsche 914, Chevy Transplant
SOLD: 2003 Trailblazer. Almost stock
2006 Chevy HHR 2LT
Nick's WS6 is offline   Reply With Quote
Old 10-15-2002, 07:52 AM   #6
Brought out of retirement Super Moderator
Garage is empty, add now
 
Reckless's Avatar
 
Trader Rating: 7
Join Date: Nov 2001
Location: Waco, TX
Posts: 9,799
Send a message via MSN to Reckless
Default Re: What would cause no compression in one cylinder

Sounds like a broken valve spring to me. It's not pulling the valve closed and allowing the air to escape into the intake or header.
__________________
Todd B.
2010 Cadillac CTS-V
Former cars:
2000 NHRA Edition Formula, A4, Hard Top
2000 Trans Am WS6
1998 Formula WS6 1LE

Reckless is offline   Reply With Quote
Old 10-15-2002, 08:22 AM   #7
TECH Regular
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2001
Location: Madison Heights, MI
Posts: 410
Default Re: What would cause no compression in one cylinder

Well I think I do have 941's
__________________
SOLD: 2001 T/A WS6 A4 Black/Black. TCI 3000, TR224, ARE Stage 2.2 Heads, Corsa Catback
1975 Porsche 914, Chevy Transplant
SOLD: 2003 Trailblazer. Almost stock
2006 Chevy HHR 2LT
Nick's WS6 is offline   Reply With Quote
Old 10-15-2002, 09:39 AM   #8
On The Tree
Garage is empty, add now
 
Trader Rating: 0
Join Date: Jan 2002
Location: Aloha, Oregon
Posts: 120
Default Re: What would cause no compression in one cylinder

i had similar symptooms when my compression ring on #7 broke. Eventually the piston came apart and destroyed the motor, hence the new 389. The quick diagnosis would be to pop the valve cover, back off the rockers so the valves can seat, pull plug, pump cylinder with air. have your dipstick out, TB uncovered. then while pumping air put your ear (use a piece of vac hose as a stethescope) at each the dipstick tube, T-body then at rear exhaust tips. you will hear a steady stream of air very easily. When i did this, the air pressure actually blew the dip stick out of the tube! i had a BIG hole in the piston!!
__________________
2001 Corvette Coupe 6spd
-Shirl Dickey/SDRE 454cid resleeved LS2, solid roller setup, ported LS1 heads = 581rwhp n/a. 320hp d.p.nitrous, high rise hood, chin spoiler, deep custom tubbed wells, HRE 19x13 rims, roll cage, etc. LS7 heads & new cam coming, gunning for 625rwhp n/a. Viper-eater

1999 Dodge Viper GTS/ACR:
-Roe Supercharger, 522ci forged stroker motor w/blower pistons- (build in progress), 14psi, CCW wheels. Anticipating >750rwhp/800rwtq on pump gas. Vette-eater
nitrousc5 is offline   Reply With Quote
Old 10-15-2002, 10:17 AM   #9
LS1Tech Co-Founder
Garage is empty, add now
 
Pro Stock John's Avatar
 
Trader Rating: 34
Join Date: Nov 2001
Location: Chicago, IL
Posts: 41,610
Default Re: What would cause no compression in one cylinder

Probably a broken spring.

Black Magic, I edited your sig... You are not a paid advertiser, cannot advertise unless you contact me.
__________________
2010 Camaro | 11.90@112 1.60 | Stock Internal H/C soon
2000 Camaro | 10.00@134 1.38 | 348, 150 shot sold
1998 Formula | 9.40@145 1.35 | 348, 88mm sold
1998 Camaro | 12.1@118 | 150, stock internal sold

LSX RECORD LIST
Pro Stock John is offline   Reply With Quote
Old 10-15-2002, 10:33 AM   #10
FormerVendor
Garage is empty, add now
 
XtraCajunSS's Avatar
 
Trader Rating: 2
Join Date: Dec 2001
Location: Baton Rouge, LA, USA
Posts: 1,956
Default Re: What would cause no compression in one cylinder

Ditto the spring theory. Just pull the valve cover...

Shane
XtraCajunSS is offline   Reply With Quote
Old 10-15-2002, 11:57 AM   #11
TECH Regular
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2001
Location: Madison Heights, MI
Posts: 410
Default Re: What would cause no compression in one cylinder

Cylinder number 3 valve spring is broke. If I give them a new spring the total cost will be $265. I guess i have a cool dealer.
__________________
SOLD: 2001 T/A WS6 A4 Black/Black. TCI 3000, TR224, ARE Stage 2.2 Heads, Corsa Catback
1975 Porsche 914, Chevy Transplant
SOLD: 2003 Trailblazer. Almost stock
2006 Chevy HHR 2LT
Nick's WS6 is offline   Reply With Quote
Old 08-26-2011, 10:53 AM   #12
Teching In
Garage is empty, add now
 
NevaslowLs1's Avatar
 
Trader Rating: 0
Join Date: Aug 2011
Posts: 7
Default

How long can you drive around with a dead cylinder
NevaslowLs1 is offline   Reply With Quote
Old 08-26-2011, 11:03 AM   #13
LS1Tech Platinum Sponsor
Garage is empty, add now
 
Sales2@Texas-speed's Avatar
 
Trader Rating: 5
Join Date: Jan 2008
Location: Texas!
Posts: 4,848
Default

You should really make a new thread...this one you dug up has been dead for about 9 years!
__________________


Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!

COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Sales2@Texas-speed is offline   Reply With Quote
Old 08-26-2011, 08:26 PM   #14
Brought out of retirement Super Moderator
Garage is empty, add now
 
Reckless's Avatar
 
Trader Rating: 7
Join Date: Nov 2001
Location: Waco, TX
Posts: 9,799
Send a message via MSN to Reckless
Default

Holy Reborn Thread Batman!
__________________
Todd B.
2010 Cadillac CTS-V
Former cars:
2000 NHRA Edition Formula, A4, Hard Top
2000 Trans Am WS6
1998 Formula WS6 1LE

Reckless is offline   Reply With Quote
Old 08-26-2011, 08:47 PM   #15
Restricted User
1999 Chevrolet Camaro
 
Trader Rating: 12
Join Date: Feb 2010
Location: kansas
Posts: 1,794
Default

lmao! Where do people keep getting this 9 year old threads from
z99ls1 is offline   Reply With Quote
Old 08-27-2011, 11:44 PM   #16
TECH Senior Member
Garage is empty, add now
 
LilJayV10's Avatar
 
Trader Rating: 36
Join Date: Apr 2007
Location: Evansville,IN
Posts: 5,967
Default

Quote:
Originally Posted by Black Magic View Post
Don't forget bent valve... Most common reason a valve won't seal, especially on these engines.
Yeah because a bent valve seals better on a non LS based engine.
LilJayV10 is offline   Reply With Quote
Old 08-27-2011, 11:44 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Tags
05, 3, burn, burnt, compression, cylinder, engine, hhr, loss, lost, low, misfire, piston, rings, trailblazer, valve, valves


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help please!!! bad rings? wilwhite2kss Generation III Internal Engine 7 09-17-2014 01:03 AM
Piston rings or valve seals? Freefallin Generation III Internal Engine 6 01-08-2014 12:17 PM
Who Thinks This Is A Bad Idea? Sinister_Z28 Forced Induction 2 12-05-2013 06:59 PM
Possible PCV valve, vacuum problems Thenextlevel LT1-LT4 Modifications 4 04-01-2013 07:46 AM
What causes blowby? AznMuscle Generation III Internal Engine 5 09-22-2012 06:05 PM



All times are GMT -5. The time now is 04:13 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details