I need help coil problems

T

tdogsmvp

New Member

May 5, 2008

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May 5, 2008

#1

• May 5, 2008

• #1

I swaped my speed density computer to a Mass Air, I switched to everything the ECU and wiring harness and now I can't get my coil to fire! Please someone help me I got to get the mustang back on the road.

 

88mouse

New Member

Apr 18, 2007

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Mooresville nc

May 5, 2008

#2

• May 5, 2008

• #2

What year is your car, and what year is the wiring harness?

 

T

tdogsmvp

New Member

May 5, 2008

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May 5, 2008

#3

• May 5, 2008

• #3

It is was a 91 coupe 4 cyl and now it has a 5.0 in it, the computer come out of a 90 5.0 auto

 

88mouse

New Member

Apr 18, 2007

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Mooresville nc

May 5, 2008

#4

• May 5, 2008

• #4

the computer will work. Did you use the 90 engine harness? If so you will have to find a 91-93 engine harness.

 

T

tdogsmvp

New Member

May 5, 2008

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May 5, 2008

#5

• May 5, 2008

• #5

i used the computer and harness out of the 90, why wouldn't it work?

 

88mouse

New Member

Apr 18, 2007

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Mooresville nc

May 5, 2008

#6

• May 5, 2008

• #6

87-89 are interchangeable,91-93 are interchangeable, and 90 is a year all by its self.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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May 5, 2008

#7

• May 5, 2008

• #7

What aspect are you missing? Do you have VPWR to the coil? Or is the ground signal from the TFI missing?

 

T

tdogsmvp

New Member

May 5, 2008

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May 5, 2008

#8

• May 5, 2008

• #8

so because the car is a 91 I have to have a 91 harness, but the car was a four cyl. the reason for the mass air change is I have double titanium valve springs, E cam, moded E7 heads 1 3/4 longtubes 3inch exhaust, double roller timing chain, smog is blocked off, mac cold air intake. And the car wouldnt stay at a idle with the speed density computer and I read in another thread that the speed density couldnt keep up with the cam. I don't know you tell me!

 

T

tdogsmvp

New Member

May 5, 2008

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May 5, 2008

#9

• May 5, 2008

• #9

I just ain't getting any fire from the coil, I have a msd blaster coil high tower, and when I wire it up both sides of the coil are hot , and the coil want fire .

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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May 5, 2008

#10

• May 5, 2008

• #10

In able for this to work effectively, one has to be able to provide diagnostic results.

If you put a test light across the terminals at the coil's electrical connector and crank the engine, does the test light flash? If you ground the test light and probe the positive electrical wire to the coil (with the key on), does the test light illuminate?

 

T

tdogsmvp

New Member

May 5, 2008

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May 5, 2008

#11

• May 5, 2008

• #11

yes the with the key on the test light does light up , but the positive and the negative lights up, its geting power to the coil but the coil want fire i can't figure this out. and it worked on the speed density computer it would cank right up but the mass air stuff is giving me some problems

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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May 6, 2008

#12

• May 6, 2008

• #12

tdogsmvp said:

yes the with the key on the test light does light up , but the positive and the negative lights up, its geting power to the coil but the coil want fire i can't figure this out. and it worked on the speed density computer it would cank right up but the mass air stuff is giving me some problems

Click to expand...

I'm not sure what you're saying.

If your hypothesis is correct however, you need a new coil.