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1993 Cobra Mustang Hates Me .....sos .. Help ..sos ..help

  • Thread starter Thread starter 1993cobra5.0
  • Start date Start date Jan 24, 2015
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Mstng93SSP

You have a nice rear end there Dave.
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Jan 26, 2015
#41
  • Jan 26, 2015
  • #41
I am also betting you have a major vacuum leak. Just went through this myself. What lower intake gasket did you use. For a cobra you can't use a standard 5.0 intake gasket. It will leak. A LOT. You need a felpro 1250 or similar gasket set that is specific for the heads/intake of a cobra/gt40 head.
 
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1993cobra5.0

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#42
  • Jan 26, 2015
  • #42
Wouldn't I hear a big vacuum leak. I had it running , but back firing last week and that's when I started throw new parts and checking things out .
 

1993cobra5.0

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#43
  • Jan 26, 2015
  • #43
Ms 95952.
1993-95 mustang cobra gasket set
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
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#44
  • Jan 26, 2015
  • #44
1993cobra5.0 said:
After market one . The car comes stock with 24 lb injectors , right ?
Click to expand...

Yes, but OEM setups don't use a "calibrated MAF" that's purely an aftermarket way to trick the computer so that you can use different injector sizes. The proper way to change size is with a tune or through the computer.

The Cobra uses programming in it's EEC to run the 24's with a special meter (as in not the same meter as the standard 5.0 HO"

You basically cannot run an aftermarketr MAF calibrated for 24's on the car because both the MAF, AND the computer are telling the car it has 24# injectors.

I would try and find an OEM 1993 Cobra 70mm MAF.
 

TOOLOW91

If you're the village idiot what's that make me?
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#45
  • Jan 26, 2015
  • #45
1993cobra5.0 said:
Wouldn't I hear a big vacuum leak. I had it running , but back firing last week and that's when I started throw new parts and checking things out .
Click to expand...
No it won't run as your describing only maybe with your foot on it to keep it running
 

1993cobra5.0

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#46
  • Jan 26, 2015
  • #46
Before I changed the intake gaskets , that's what I had to do to keep it running
 

1993cobra5.0

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#47
  • Jan 26, 2015
  • #47
This car hates be , it is only getting worse any thing I work on it . Well I ordered the new fuel psi gauge . If fuel is good . Nd if i can't find a vaccum leak . I will buy a new maf . That maf had been on the car for 6 years . And ran great on the car . The lasted owner b4 me installed it . It's a 70 mm
 

1993cobra5.0

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#48
  • Jan 26, 2015
  • #48
If I need to remove the intake again . I'm going to buy a new one . How's the. Trick flow track and heat
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,260
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#49
  • Jan 26, 2015
  • #49
1993cobra5.0 said:
That maf had been on the car for 6 years . And ran great on the car . The lasted owner b4 me installed it . It's a 70 mm
Click to expand...

Then there's probably a chip, or a different computer in that car. You may want to investigate that further.

Also, what codes were present when you ran them? Did you run them?
 

Shakerhood

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#50
  • Jan 26, 2015
  • #50
1993cobra5.0 said:
This car hates be , it is only getting worse any thing I work on it . Well I ordered the new fuel psi gauge . If fuel is good . Nd if i can't find a vaccum leak . I will buy a new maf . That maf had been on the car for 6 years . And ran great on the car . The lasted owner b4 me installed it . It's a 70 mm
Click to expand...
That just doesn't sound right as the Stock Meter would have been 70mm, why would the previous owner swap it out for another 70mm. You should do as said above and do a little investigating on that.
 

TOOLOW91

If you're the village idiot what's that make me?
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#51
  • Jan 26, 2015
  • #51
If you don't mind me asking what's your mechanical back round ?
 

90lxwhite

I'm kind of a She-Man
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Between the Red and Rio
Jan 26, 2015
#52
  • Jan 26, 2015
  • #52
Mustang5L5 said:
Yes, but OEM setups don't use a "calibrated MAF" that's purely an aftermarket way to trick the computer so that you can use different injector sizes. The proper way to change size is with a tune or through the computer.

The Cobra uses programming in it's EEC to run the 24's with a special meter (as in not the same meter as the standard 5.0 HO"

You basically cannot run an aftermarketr MAF calibrated for 24's on the car because both the MAF, AND the computer are telling the car it has 24# injectors.

I would try and find an OEM 1993 Cobra 70mm MAF.
Click to expand...
He said it ran good for 5 years with the same maf he has now. I don't think it's a maf/tuing problem unless that is the maf he has crapped out. I've had stock maf's go bad, when they do the car will start and kinda choke, stumble, and die. Tell us the codes that you got when u ran codes? What are the numbers?
 

TOOLOW91

If you're the village idiot what's that make me?
20+ Year Stangneter
Nov 29, 1999
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#53
  • Jan 26, 2015
  • #53
90lxwhite said:
He said it ran good for 5 years with the same maf he has now. I don't think it's a maf/tuing problem unless that is the maf he has crapped out. I've had stock maf's go bad, when they do the car will start and kinda choke, stumble, and die. Tell us the codes that you got when u ran codes? What are the numbers?
Click to expand...
The Prob is its not as simple as tbat now because he touched so much stuff at this point it just sounds like a big vac leak
 
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90lxwhite

I'm kind of a She-Man
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#54
  • Jan 26, 2015
  • #54
TOOLOW91 said:
The Prob is its not as simple as tbat now because he touched so much stuff at this point it just sounds like a big vac leak
Click to expand...
Oh I hear ya. I'd rule out the maf deal though. Did he ever say what codes? Is it time for the soapy water test?
 

Shakerhood

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#55
  • Jan 27, 2015
  • #55
I was hoping he dumped the codes too.
 

90lxwhite

I'm kind of a She-Man
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#56
  • Jan 27, 2015
  • #56
Shakerhood said:
I was hoping he dumped the codes too.
Click to expand...
He said he did but never reported what they were.
@1993cobra5.0 How bout some codes Maddog?
 

1993cobra5.0

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#57
  • Jan 27, 2015
  • #57
Mustang5L5 said:
Then there's probably a chip, or a different computer in that car. You may want to investigate that further.

Also, what codes were present when you ran them? Did you run them?
Click to expand...
The computer is stock .ford . No chip . I opened it up . Looks good inside .
 

1993cobra5.0

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#58
  • Jan 27, 2015
  • #58
Shakerhood said:
That just doesn't sound right as the Stock Meter would have been 70mm, why would the previous owner swap it out for another 70mm. You should do as said above and do a little investigating on that.
Click to expand...
Maybe it's bigger . How can I put some pix up here for you guys to see the MAF
 

1993cobra5.0

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#59
  • Jan 27, 2015
  • #59
TOOLOW91 said:
If you don't mind me asking what's your mechanical back round ?
Click to expand...
Oh boy , I restore 60's camaros and work on a lot of 1985 to 92 TPI bodies
I've done many 4 to v8 swaps on mustang . I rebuilt my 1987 GT and 85 GT from the ground up .
 

1993cobra5.0

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#60
  • Jan 27, 2015
  • #60
90lxwhite said:
He said he did but never reported what they were.
@1993cobra5.0 How bout some codes Maddog?
Click to expand...
90lxwhite said:
He said he did but never reported what they were.
@1993cobra5.0 How bout some codes Maddog?
Click to expand...
I'm going to check for codes today
 
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