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no compression

Old Apr 20, 2007 | 12:41 PM
  #1  
saliger64504's Avatar
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From: St.Joseph Mo
Car: 1984 firebird trans am
Engine: 383 stroker
Transmission: th350
Axle/Gears: 10 bolt posi with 373 ring and pini
no compression

well i found out y my car wont start now has no compression any idea what would case that and how to fix it. i had my g/f turn the car over wile i held my fingle over the #1 cylender and nuthen. i changed a frew things on the car since i put it in storage new tranns, flexplate and i took the old breather caps witch where connected to my intake and put new ones on that didnt hook up to the vacum on the intake. but if anyone knows y i lost all my compression please help me out


scott

Last edited by saliger64504; Apr 20, 2007 at 04:56 PM.
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Old Apr 20, 2007 | 12:50 PM
  #2  
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: no compression

Broken timing chain?

BTW, punctuation is your friend. Don't be afraid of it.
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Old Apr 20, 2007 | 02:55 PM
  #3  
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From: St.Joseph Mo
Car: 1984 firebird trans am
Engine: 383 stroker
Transmission: th350
Axle/Gears: 10 bolt posi with 373 ring and pini
Re: no compression

ok ill cheack that out. i have no compression on 1 or 3 cylender.
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Old Apr 20, 2007 | 02:59 PM
  #4  
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: no compression

Holy cow man, your spelling is brutal! I don't mean to insult, but when it gets in the way of understanding, it's a hindrance.

Ok, so no compression in 1 or 3, but ok compression in the rest?
Can you explain the valve caps? I have no idea what you mean there.

Something in valve train is my guess, which may or may not relate to the "valve caps" thing.
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Old Apr 20, 2007 | 03:09 PM
  #5  
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From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: no compression

Interesting how it's 1 & 3. Next to each other. I wonder if you cracked your head....hmmm.
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Old Apr 20, 2007 | 03:22 PM
  #6  
5678TA's Avatar
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From: Maui, Hawaii
Car: 1984 Trans Am
Engine: broken 385sbc
Transmission: G-Force rebuilt T-5
Axle/Gears: Currie 9" Ford 4.30:1
Re: no compression

here is a question.. did you happen to over rev it before storage time??? to the point of extreme valve float??

could be bent valves, broken timing chain, missing pistons and rods(joking)
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Old Apr 20, 2007 | 04:05 PM
  #7  
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From: Illinois
Car: 89 Firebird
Engine: 350 Ramjet
Transmission: 700R4
Axle/Gears: GM 9 bolt 3:27
Re: no compression

I small shot of engine oil and a new compression test will tell you if it is the rings or valves. If compression comes up then look toward the rings if not look toward the head. Not 100% look but gives an educated guess how far you have to tear it down if needed.
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Old Apr 20, 2007 | 04:13 PM
  #8  
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From: Maui, Hawaii
Car: 1984 Trans Am
Engine: broken 385sbc
Transmission: G-Force rebuilt T-5
Axle/Gears: Currie 9" Ford 4.30:1
Re: no compression

if you dont have compression, it would be best to tear it down anyway.. you will have to, to re-ring it anyway..
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Old Apr 20, 2007 | 04:47 PM
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From: St.Joseph Mo
Car: 1984 firebird trans am
Engine: 383 stroker
Transmission: th350
Axle/Gears: 10 bolt posi with 373 ring and pini
Re: no compression

Ok what i ment by the valve caps is that its the beather caps that go on top of the valve covers, my old breather caps where hooked to the top of my intake but i got read of them and went with a different set that dont hook to the top of the intake. i have no compression anywhere on my motor and i just did a compleat oil change i also put a new radiator in it.


here we go. things i have done to it since i bought the car

new plugs and plug wires.
compleat oil change
new air filter
th350 trans
168 flexplate
starter
shift cable
kickdown cable
new distributar cap
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Old Apr 20, 2007 | 05:14 PM
  #10  
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From: Maui, Hawaii
Car: 1984 Trans Am
Engine: broken 385sbc
Transmission: G-Force rebuilt T-5
Axle/Gears: Currie 9" Ford 4.30:1
Re: no compression

you can do an incomplete oil change??? but still, your list dont mean anything.. none of that has anything to do with compression.. theres only a few things that can be causing little or no compression.. thats broken timing chain, bent valves, cracked head(s), blown head gasket(s) or toasted piston rings.. your best bet would be to pop the valve covers off and check to see if the valves are moving at all when it is being cranked over.. no move=no timing chain.. make sure all of them come up all the way.. if some dont come up all the way=bent valve(s)..
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Old Apr 20, 2007 | 05:44 PM
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: no compression

see if the valves are moving at all when it is being cranked over.. no move=no timing chain.. make sure all of them come up all the way.. if some dont come up all the way=bent valve(s)..
Yea, that's good. Your valves are what will be telling you if you're getting compression. I think that's a more likely failure point than a piston...disappearing...
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Old Apr 20, 2007 | 06:09 PM
  #12  
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From: Maui, Hawaii
Car: 1984 Trans Am
Engine: broken 385sbc
Transmission: G-Force rebuilt T-5
Axle/Gears: Currie 9" Ford 4.30:1
Re: no compression

what are you talking about?? pistons can disappear....


off the shelf that is..
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