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'84 Mustang Hesitating


ellersk's Avatar
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09-24-04, 08:48 PM   #1  
'84 Mustang Hesitating

I have an '84 Mustang with a 5.0, manual transimission and approx. 82,000 miles. During acceleration and between 1,000 and 2,000 RPM, the engine hesitates or misses badly and after 2,000 RPM, it runs smoother, but lacks pick up. Car idles and starts fine.

I changed the plugs, cap & rotor and rebuilt the stock Holley 4180 carb, but this has not helped the problem (I also recently changed the clutch for an unrelated problem to this).

Any idea on what to check or look for? All help is appreciated.

Thanks.

 
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the_tow_guy's Avatar
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FL

09-25-04, 05:07 AM   #2  
How old are the plug wires?

 
ellersk's Avatar
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09-25-04, 10:42 AM   #3  
I changed from the stock wires to Accel wires on 8/29/88 at 30,157. Long time ago, but they look okay. Is there a certain life on wires and would old wires cause a problem like this?

 
slickshift's Avatar
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09-25-04, 11:57 AM   #4  
Your Mustang Routine Maintenance Guide says 2 years or 24K so I guess it's time...lol!
They can gradually deteriorate and cause a problem like this
You could check the ohms on them but to do so you have to take them off-might as well replace them

As a side note I have heard the 5.0s don't like aftermarket wires
I personally have had no problems with Accels on these engines
You might want to stick with Accels or FoMoSpos

 
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09-27-04, 06:31 AM   #5  
I had put an Accel Ignition Coil at the same time I changed the wires in '88 - do ignition coils also tend to wear out or should I just replace the wires?

Thanks for your help.

 
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09-27-04, 06:53 AM   #6  
I would be less likely to think the Accel coil is worn out but you bring up a good point
If you have the square one on your strut tower it's easy enough to check
Dissconnect the wires from the coil and run an ohmmeter across the primary (small wire, should say + & -) terminals
Then from the - to the secondary (big terminal that goes to dist cap)

The stock specs are:
Primary: 0.8-1.6 ohms
Secondary: 7.7-10.5 K-ohms

I suspect the Accel specs are different, but this may get you in the ball bark
PS if you find the Accel specs please let me know, thanks

 
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09-27-04, 11:12 AM   #7  
mr gasket

I had a chance to goto www.mrgasket.com, then to the Accel section, then to Tech
You can e-mail or call them with your part # and they'll send you specs
And from the site it looks like you might have the cylinder coil, the test process is the same
There was also a post about wire resistence being 3K-7K per foot (of wire)
I assume this would vary from model to model also

 
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