PT Cruiser Forum  
Advertisements
       

Go Back   PT Cruiser Forum > General Forums > Tech & Performance Forum

PT Cruiser Forum

Advertisements
Low compression test with only 93K miles

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 03 Sep 2010, 03:53 pm
Fresh Cruiser
 
Join Date: Feb 2010
Posts: 46
Default Low compression test with only 93K miles

I have a 2003 2.4L that has 93000 miles.It won't start. I just did the compression test on the cylinders and it gave me 60 on cylinder one and 30 on cylinder 4. Book says it should be between 175 and 225 with no more that 25% variation between. Why would i get such a low reading when the engine only having 93K miles. The timing cover was taken off and I checked the belt and the timing marks are right on when checked.
Reply With Quote
  #2 (permalink)  
Old 03 Sep 2010, 04:34 pm
cruserdad1976's Avatar
Obsessed Cruiser
 
Join Date: Sep 2009
Location: st james mo
Posts: 8,217
Default Re: Low compression test with only 93K miles

wow thats just not right 30 is almost nothing at all what did you get on the other 2 cylenders?????? you would almost have to have a burnt valvue or a stuck ring or both did the car run really rough before????? it would have had to have a big time miss if it was running on 2 cyls
Reply With Quote
  #3 (permalink)  
Old 03 Sep 2010, 04:52 pm
Fresh Cruiser
 
Join Date: Feb 2010
Posts: 46
Default Re: Low compression test with only 93K miles

I haven't taken out the intake to gain access to the other 2 cylinders. I bought the car from an individual who really didn't know why it wouldn't start for a thousand with a worse case scenario in mind to swap out the engine. The body and interior are in mint condition so i figured if i had to drop another engine in it I would cause it would still come out to only a total 2 grand investment. So I'm going down the list of checking stuff to see what could possibly be wrong with it. The timing belt and marks have been checked out and are accurate and in good condition. I'm still thinking worse case scenario but before that I would like to consider if the head might be warped and maybe that's why i'm getting bad compression readings. Tomorrow i'm going to pour a little heavy oil into the cylinders and see if the compression goes up. If it does i'm guessing the compression rings are out if it maintains the same compression i'm contemplating if the head might be warped.
Reply With Quote
  #4 (permalink)  
Old 03 Sep 2010, 05:00 pm
Cool Cruiser
 
Join Date: Nov 2007
Posts: 394
Default Re: Low compression test with only 93K miles

Pull the head, check the valves, gotta be that or rings/neglect.

Is it conceivable that the timing belt broke and the person changed it only to find that valves hit each other and didn't want to do the head work? 93k is exactly where a lot of these cars break the timing belt.
Reply With Quote
  #5 (permalink)  
Old 03 Sep 2010, 05:18 pm
Fresh Cruiser
 
Join Date: Feb 2010
Posts: 46
Default Re: Low compression test with only 93K miles

I don't think it's conceivable that he replaced the belt. The belt looks old and grungy. I was the one who removed everything to get access to the timing belt, it looks like it needs replacing but for the moment that couldn't be the cause of the low compression since even though it needs replacing it's tight and the timing marks all match up when i turned the crank, every time i turned the crank to set up tdc for 1 cylinder the timing marks matched up.
Reply With Quote
  #6 (permalink)  
Old 04 Sep 2010, 07:58 am
Cool Cruiser
 
Join Date: Nov 2007
Posts: 394
Default Re: Low compression test with only 93K miles

Quote:
Originally Posted by luckybadazzboy View Post
I don't think it's conceivable that he replaced the belt. The belt looks old and grungy. I was the one who removed everything to get access to the timing belt, it looks like it needs replacing but for the moment that couldn't be the cause of the low compression since even though it needs replacing it's tight and the timing marks all match up when i turned the crank, every time i turned the crank to set up tdc for 1 cylinder the timing marks matched up.
OK good. I don't think I've heard of very many valve issues on these boards, but you never know. Heavy oil trick will tell you if the rings are good. If the previous owner overheated the fudge out of it the head will warp/crack.
Reply With Quote
  #7 (permalink)  
Old 07 Sep 2010, 10:29 am
quicksilverdon's Avatar
Obsessed Cruiser
 
Join Date: Nov 2003
Location: Felton, Delaware
Posts: 20,501
Default Re: Low compression test with only 93K miles

Unlikely head warped and you don't have oil in coolant or coolant in oil....-I am assuming you checked that?
I have not read of any ring issues - a few valve issues....
Can you trust the complession tester? Have you tried it on another (known good) engine?
__________________
"Anti-intellectualism has been a constant thread winding its way through our political and cultural life,
nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge."
Isaac Asimov"

'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler. Mods: E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in '02 Silver Touring Edition w/87,000 miles
Reply With Quote
  #8 (permalink)  
Old 07 Sep 2010, 10:45 am
Fresh Cruiser
 
Join Date: Feb 2010
Posts: 46
Default Re: Low compression test with only 93K miles

I thought it was a possibility so I tested the compression tester meter on another car with the same 2.4L engine gave me 225 and above on cylinder 1 and 4. so it could not be the tester.
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
Interpret compression test results fixing timing belt makku Tech & Performance Forum 8 22 Nov 2009 05:12 pm
engine low on compression LoWandSloW Tech & Performance Forum 7 02 Jul 2007 09:58 am
Compression fittings on terminals 2step Sound and Security Forum 4 15 Jan 2005 05:02 pm
compression fittings Punch Exterior & Interior Styling 10 11 Nov 2003 10:36 pm
compression fittings? Punch General PT Cruiser Discussions 4 02 Oct 2003 12:59 pm


All times are GMT -5. The time now is 11:09 am.




Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors