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hind site is 20/20,LOL

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Old Apr 27, 2007 | 01:22 AM
  #1  
hwcoll95's Avatar
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From: middle TENNESSEE
Car: 1989 Iroc rebuild
Engine: 355 carb'd
Transmission: 5spd
Axle/Gears: 3:08 pos for a while
hind site is 20/20,LOL

well got her put all back together and seemed to run as before,plenty power,just wandering,lopey idle,well after playing with it on the scope,#5 had a unusually high firing line,so let's pull the plugs,and #5 was all carboned up,here's the compression test,all cylinders as is(no adding oil for wet test)

#1 165 #2 170
#3 155 #4 155
#5 40 #6 140
#7 165 #8 175 pulling @12inHg @ 750rpm idling

may do cylinder leakage test to determine further actions,but for now just drive it like you stole it!!hehehe

shame didn't know then what I know now



how it started


somework


and wala

Last edited by hwcoll95; Apr 27, 2007 at 01:25 AM.
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Old Apr 27, 2007 | 05:25 AM
  #2  
Viprklr's Avatar
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From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: hind site is 20/20,LOL

Originally Posted by hwcoll95
shame didn't know then what I know now
What would that be?

Nice car.
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Old Apr 27, 2007 | 10:24 AM
  #3  
Damon's Avatar
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From: Philly, PA
Re: hind site is 20/20,LOL

When you're seeing 40 PSI in a cylinder there's a good chance something has gone horribly wrong (mechanically speaking). Just please make sure you don't have the one SIMPLE thing it could be before tearing into the motor.... a rocker adjusted down too far and hanging one off the valves slightly off it's seat. It can cause all the problems you describe and takes only a matter of minutes to fix.

If you can, back off the rocker nuts 1 turn each on both valves of #5 and try your compression test again. If it's suddenly much higher compression you've gotten lucky and all you need to do is properly adjust the valves.
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Old Apr 27, 2007 | 03:05 PM
  #4  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
A wet compression test would be valuable as well.
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Old Apr 27, 2007 | 07:54 PM
  #5  
jjb's Avatar
jjb
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Joined: Apr 2006
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From: Mesa, Arizona
Car: 1986 Z28
Engine: 350
Transmission: T5
Axle/Gears: 3.42
Re: hind site is 20/20,LOL

I would reccomend doing a leakdown test on #5 and seeing where all that compression is going. I hope it's something simple for yah!
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Old Apr 28, 2007 | 12:29 AM
  #6  
hwcoll95's Avatar
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Joined: Mar 2002
Posts: 587
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From: middle TENNESSEE
Car: 1989 Iroc rebuild
Engine: 355 carb'd
Transmission: 5spd
Axle/Gears: 3:08 pos for a while
Re: hind site is 20/20,LOL

thanx guys for some input,so glad to finally start driving it haven't gotten around to actually tracking problem down,probably pulled valve cover next week,maybe even the leak down test,suspected a blown head gasket long before the accident anyways,use to get the milkshake,but only at the top of dipstick,and after highway long cruises,never saw the milkshake anywhere else,and coolant wasn't disappearing form overflow tank,but hey it's a 18 year old car with 103K,a couple of accidents,and no telling what was done before I even got it back in '02,the repair is long and costly,struts,A/C compressor,retro kit,accumulator etc,the engine (hope something easy)the rear end(housing),the brake with rotors,the headliner,the list seems to never end.hehehehe
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