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85 GT intermittent miss at highway speed

  • Thread starter Thread starter rwordenjr
  • Start date Start date Jan 29, 2025
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rwordenjr

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#41
  • Feb 1, 2025
  • #41
Noobz347 said:
How many miles?
Click to expand...
86k og miles
 

Noobz347

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#42
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That's not a lot.
 
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rwordenjr

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#43
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Noobz347 said:
How many miles?
Click to expand...
Plugs 5 and 8
 

Noobz347

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#44
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Those are more normal looking. Still show signs of being a little lean.
 
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rwordenjr

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#45
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Spark plugs changed… just test drove. It did it once in 5 min
 
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rwordenjr

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#46
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Noobz347

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#47
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It looks to me like you're not getting enough fuel.
 
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rwordenjr

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#48
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Noobz347 said:
It looks to me like you're not getting enough fuel.
Click to expand...
That would cause intermittent miss only at certain rpm at certain speed ? That’s what nuts about this. It’s very specific conditions to make it happen
 

Noobz347

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#49
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Wait for some more opinions to come through this evening but my next step would be to rebuild the carb and check for vacuum leaks.
 
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85GTStangGuy

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#50
  • Feb 2, 2025
  • #50
Noobz347 said:
.... my next step would be to rebuild the carb and check for vacuum leaks,
Click to expand...

Agree (other than it's actually a throttle body). I'd think that would be a good thing at this point in it's life...

More Information for STANDARD MOTOR PRODUCTS 1522
 
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General karthief

wonder how much it would cost to ship you a pair
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#51
  • Feb 2, 2025
  • #51
85GTStangGuy said:
Agree (other than it's actually a throttle body). I'd think that would be a good thing at this point in it's life...

More Information for STANDARD MOTOR PRODUCTS 1522
Click to expand...
Not a bad idea
 

Noobz347

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#52
  • Feb 2, 2025
  • #52
85GTStangGuy said:
Agree (other than it's actually a throttle body). I'd think that would be a good thing at this point in it's life...

More Information for STANDARD MOTOR PRODUCTS 1522
Click to expand...

Tomato/tomato pineapple/hand grenade whatever

I'll rephrase: Convert to carb
 
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AeroCoupe

lube between the nut and the face. I know my lubes
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#53
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The other thing about all of this is the ECU harness is almost 40 years old and most likely brittle. The one on my 83 T-Bird was and it had all kinds of bare spots on wires. Pulled the CFI system off and went carb and never looked back.
 
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rwordenjr

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#54
  • Feb 2, 2025
  • #54
AeroCoupe said:
The other thing about all of this is the ECU harness is almost 40 years old and most likely brittle. The one on my 83 T-Bird was and it had all kinds of bare spots on wires. Pulled the CFI system off and went carb and never looked back.
Click to expand...
One issue with me swapping to carb… is the state I live in. I won’t be able to pass smog. CA
 

AeroCoupe

lube between the nut and the face. I know my lubes
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#55
  • Feb 2, 2025
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Interesting. So even though they came stock with a carb on stick cars you cannot swap due to the VIN showing it is an automatic with CFI? Can you swap it to 89-93 injection?
 
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rwordenjr

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#56
  • Feb 2, 2025
  • #56
AeroCoupe said:
Interesting. So even though they came stock with a carb on stick cars you cannot swap due to the VIN showing it is an automatic with CFI? Can you swap it to 89-93 injection?
Click to expand...
Correct. And I don’t think you can swap anything on it legally unless you use parts that are “CA legal” stickered which are premium priced. For example… there is only 1 street legal CA x pipe with cats and it’s $2K +
 

AeroCoupe

lube between the nut and the face. I know my lubes
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#57
  • Feb 2, 2025
  • #57
So can you swap it to a factory injection setup off an 89-93 car?
 

Noobz347

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#58
  • Feb 2, 2025
  • #58
AeroCoupe said:
Can you swap it to 89-93 injection?
Click to expand...

That would suck so much balls to have to do. lol
 

gkomo

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#59
  • Feb 2, 2025
  • #59
rwordenjr said:
Correct. And I don’t think you can swap anything on it legally unless you use parts that are “CA legal” stickered which are premium priced. For example… there is only 1 street legal CA x pipe with cats and it’s $2K +
Click to expand...
Ooo I have that x-pipe and yes it sucked major balls to have to buy.
 
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rwordenjr

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#60
  • Feb 2, 2025
  • #60
Just installed that Renan distributor with new pip and tfi… car running even worse now. Idling so low so in park, sluggish. I correctly set timing after installed diz. Wtf !
 
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