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.

HESITATING engine please help!!!!!!!!!

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Old 06-17-2006, 06:14 PM
  #1  
number1_kid
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Default HESITATING engine please help!!!!!!!!!

Hey guys

1987 Mustang Cobra GT with 5.0 H.O

bought this car a week ago
runing bad since
a small hesitating from 2500rpm to 5500

sometimes it runs good but only for like 15 seconds.

Fuel pump new
new fuel filter
new plugs
new plug wires
new cap
new rotor

I did not install these but they are new

Anyways

here is what is done numbers are marked on the cap with a marker like this

Wires--------------------Cap
1---------------------------1

2---------------------------2

3---------------------------5

4---------------------------7

5---------------------------3

6---------------------------6

7---------------------------4

8---------------------------8

Ok the marking on the cap could be wrong.

Dont know who did it what

Can someone please help me with this

thanks
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Old 06-17-2006, 07:09 PM
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RacquetballRyan
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Default RE: firing order please help!

ORIGINAL: silver91gt

if it is a HO motor your firing order will be 1-3-7-2-6-5-4-8.
the distributor turns counterclockwise, so find the 1 on the distributor cap, this should go to the #1 sparkplug.
ford numbered their cylinders from 1-8 starting on the passenger side front working to the firewall.
left is 1234
right is 5678
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Old 06-17-2006, 07:49 PM
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silver91gt
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Default RE: firing order please help!

ya got here before me ryan,
you have the firing order for a non-HO motor.
change the firing order and it will be fine.
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Old 06-17-2006, 07:59 PM
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number1_kid
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Default RE: firing order please help!

ok guys this is what was in my car exact as this site.

http://autorepair.about.com/library/...l-fo-11838.htm

So nothing is wrong with the wiring


Cause it did work fine the car for 2 days when I got it

Now all that stuff is new.

I cleaned the EGR valve

Still that damn hesitating sound

now what????????
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Old 06-17-2006, 08:11 PM
  #5  
ckyguy68
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Default RE: firing order please help!

whats your voltage read? did you clean the MAF? maybe you need new 02s
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Old 06-17-2006, 08:18 PM
  #6  
number1_kid
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Default RE: firing order please help!

I have the 87

they dont have mass air flow I think

voltage little over half the gauge

new baterie
new altenator

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Old 06-17-2006, 08:57 PM
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brutal_gt
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Default RE: firing order please help!

hmm coil, possibly...
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Old 06-17-2006, 09:09 PM
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ckyguy68
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Default RE: firing order please help!

how does it run right after you start it, as opposed to when you reach operating temp.?
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Old 06-17-2006, 09:10 PM
  #9  
number1_kid
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Default RE: firing order please help!

had my car 8 days
havent been able to take 1 no problem ride

sucsk real bad

if I cant fix it in a week

for sale.

wanted one for 7 years I get one and all new stuff
still dont work
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Old 06-17-2006, 09:11 PM
  #10  
ckyguy68
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Default RE: firing order please help!

dont just give up over something this stupid, youd be surprised what it could be. keep answering our questions so we can narrow it down for you.
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