5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

compression

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Old Sep 4, 2007 | 06:32 AM
  #1  
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bikeboy587
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Default compression

I still can't figure out why my 95 gt is reving so slow and cant get out of its own way....[/align]I have replaced the :[/align]fuel filter[/align]cap[/align]rotor[/align]distributor[/align]wires[/align]coil[/align]took off injectors and cleaned them(going to get new ones or have the old onces professionally cleaned and balanced)[/align]checked fuel rail and fuel pump flow[/align]MAF is new already[/align]Checked CATs (took off mid pipe, looked clean, and ran open headers, car still couldn't get out of its own way)[/align][/align]my car still has white plugs...very lean....and i can't pin point y[/align][/align]anyways im doing a compression test tomorrow, and I want to know what is the correct compression in each cylinder that i should see on the compression gauge if a cylinder is healthy?[/align][/align]if anyone else has imput please let me know[/align][/align]*i am also throwing a check engine light that will come on while driving, stay on for a min or two, then go off. I have tried to have it scanned and no one can find the code in the history of the computer so i dont know what this code is...[/align]
Old Sep 4, 2007 | 06:48 AM
  #2  
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HACKGT350
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Posts: 6,635
From: new jersey
Default RE: compression

sounds to me like you have a very bad vacuum leak. take some carb cleaner and spray around the hoses and lines if you do have one the rpms will spike a little. also spray around the intake and all
Old Sep 4, 2007 | 07:13 AM
  #3  
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bikeboy587
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Default RE: compression

just re did the intake, since i had to take it off to get the fuel rail off. i replaced one line that looked a little old but thats it. the car idels and runs SMOOTH, not rough, it just has no ***** when you get on it because 3 out of the 4 plugs i pulled are whiter than a ghost, aka no fuel. when i tested my injectors they were "pissing" fuel instead of misting it so I think it might be them, also the car was driven 4k in the past 2 years....it sat alot and i dont think the guy ever took it over 2.5k rpm. i still want to know what the code it that i randomly throw and i want to do a compression test
Old Sep 4, 2007 | 06:14 PM
  #4  
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tinman
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From: Arizona
Default RE: compression

When you do the compression test, just look to see if all 8 cylinders are within 10% of each other.
I would bet they are........
Old Sep 4, 2007 | 07:40 PM
  #5  
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Curlytop
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Joined: Aug 2007
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From: louisana
Default RE: compression

check your wires again. i had a similar problem when i change my headers. the headers was melting my #3 and #5 wires. i had some arching going on. i put those taylor boot protectors around some new taylor ignition wires. also check your timing.
Old Sep 4, 2007 | 08:41 PM
  #6  
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bikeboy587
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Default RE: compression

well i did check the timing....one of the first things and somehow the guy before me had it at 24*, i set that b*tch back to 14*. the wires are new, and im sure good, i have been over all of them while taking them on and off checking the plugs....finding them white and lean
Old Sep 4, 2007 | 08:44 PM
  #7  
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mattdel
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From: Spfld, MA
Default RE: compression

well, the injectors should be spraying like the bottom of this.


Old Sep 4, 2007 | 08:47 PM
  #8  
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bikeboy587
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Default RE: compression

for lack of a better comparision, mine were spraying like you **** when you go to the bathroom, they were one solid stream, and i only got that after i cleaned them bec some were not spraying at all at first...so i need new injectors?
Old Sep 4, 2007 | 08:58 PM
  #9  
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mattdel
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From: Spfld, MA
Default RE: compression

might be cleanable, might not be.
its your decision whether you want to maybe waste money on an unsuccessful cleaning.
Old Sep 5, 2007 | 07:57 AM
  #10  
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bikeboy587
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Default RE: compression

i am just going to get new injectors....getting tired of chasing the problem unsuccessfully
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