Mechanics

MISS ON CYL. 2 AND 5

1990 Ford F-150 • 250,000 miles

4.9 ltr. Straight 6 missing on 2 and 5 cyl. Good compression, fire, gas, timing and new computer. Pulled a code 81, air management 2 circuit failure. Any ideas because i've run out. Billy
Avatar
Billyboy1983
August 23, 2013.



Faulty distributor cap, vacuum leads check these first.

Mhpautos
Aug 23, 2013.
Replaced distributer cap, rotor button and all vacuum leads seem to be ok. Still have a dead miss.
HELP.

Tiny
Billyboy1983
Aug 26, 2013.
Do you know what the spark voltage is, do you have a good hot blue spark?

Mhpautos
Aug 27, 2013.
I have a blue spark on all cylinder's.

Tiny
Billyboy1983
Aug 27, 2013.
I feel that there must be a vacuum leak affecting these cylinders, ensure that this is not the case first.

Mhpautos
Aug 29, 2013.