No fire to cylinders five and six

Tiny
BILL COOK4
  • MEMBER
  • 1986 FORD F-150
  • 4.9L
  • 6 CYL
  • 4WD
  • MANUAL
  • 200,000 MILES
I am getting fire on my cap to cylinder number five and none on number six.
Friday, February 23rd, 2018 AT 2:29 PM

6 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Is your firing order correct?

How are you testing for spark?

Have you swapped number six plug wire with another (like number one)?

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Friday, February 23rd, 2018 AT 3:52 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,489 POSTS
Pull the cap and see if the contact inside the cap is corroded away.
When was the last time it got a cap/rotor/wires/plugs?
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Friday, February 23rd, 2018 AT 5:06 PM
Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Also, a hairline crack on the distributor cap could cause this. I had one do the same to me. I chased it all around the ignition system, replacing the plug, the wire, cleaning the cap contacts, and so on. Finally I put a new cap on. When I got the old one into the light, I could see the crack in it leading from the number one cylinder (the one that was not firing) towards the center contact. Presto change-o, it purred like a kitten again when I fired it up. So, get a new cap.
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-1
Friday, February 23rd, 2018 AT 7:59 PM
Tiny
BILL COOK4
  • MEMBER
  • 1 POST
Two new caps no fire on six all five others okay.
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Saturday, February 24th, 2018 AT 8:54 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
No answers for my questions?

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Saturday, February 24th, 2018 AT 12:44 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,489 POSTS
Okay, you had two new caps and get spark at all towers except number six?
How and where did you test for the lack of spark? End of the wires? At the plug? With a spark plug or spark tester?
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Sunday, February 25th, 2018 AT 6:46 PM

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