I have a 1990 Ford F150. Cranks but wont fire.

15

Asked by Aug 08, 2015 at 11:45 AM about the 1990 Ford F-150 XL Extended Cab LB

Question type: Maintenance & Repair

I have a 1990 Ford F150.  It was running fine and then all of a sudden it wouldn't start.  
It Cranks like mad and I can smell gas but it will never fire.  I tested the ignition control
module (with a home made tester) and it tested fine.( One wire continuous 12 V, the
other flashing when cranking).  I replaced the coil to no avail.I had the trucked towed to
a service center and they also tested the ICM(with a real tester) and again it was fine.  
They then replaced the coil (again), and the truck will still not fire.  Anyone have any
ideas?Thanks

8 Answers

18,230

If everything is checking out ok the plugs must be fouled out and not firing.

15

I don't suspect that is the problem as it ran perfectly once second and not the next. Also there is no spark from the high voltage coil wire. I'm curious how the coil is grounded?

18,230

Instand of guessing remove one of the spark plugs out plug back in spark plug wire and hold plug close to a ground and have someone turn engine over you should get a spark if its firing. If you get a spark the plugs are not firing and if not check ground to coil.

1 out of 1 people think this is helpful.
15

I tested the main output coil wire and got not spark. I also did the test you are suggesting and again got no spark.

1 out of 1 people think this is helpful.
91,005

If all of the wiring checks and you still don't have fire out of the coil then it is a bad coil even though it is new, if you finally get fire from the coil but nothing at the distributor replace coil wire, however if the ignition wires have not been replaced in the past 3 years now would be a good time to replace them, so if you have fire at the distributor but not at the plugs replace the cap and rotor, and that should give spark at all of the plugs.

18,230

If know power going to coil check ignition fuse.

1 out of 1 people think this is helpful.
15

I have tried 2 new coils to no avail and I guess it is possible they were both bad. Is there any way to test a coil independent of the vehicle? IE some kind of resistance test?

91,005

Go to : http://www.ehow.com/how_5941137_test-ford-ignition-coil.html

Your Answer

Add photo

Related Questions

F-150

Looking for a Used F-150 in your area?

CarGurus has 209,704 nationwide F-150 listings starting at $1,499.

ZIP:

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 7,700
#2 dandyoun
dandyoun
Reputation 4,330
#3 tennisshoes
tennisshoes
Reputation 2,690
View All

Related Models For Sale

Used GMC Sierra 1500
799 Great Deals out of 67,169 listings starting at $2,700
Used Ford Mustang
388 Great Deals out of 47,511 listings starting at $1,800
Used Ford F-250
464 listings starting at $3,975
Used Ford Explorer
830 Great Deals out of 75,041 listings starting at $1,200
Used Ford Ranger
186 Great Deals out of 6,019 listings starting at $1,750
Used Jeep Wrangler
275 Great Deals out of 18,613 listings starting at $2,995

Used Cars For Sale

2017 Ford F-150 For Sale
21 Great Deals out of 126,273 listings starting at $16,464
2016 Ford F-150 For Sale
116 Great Deals out of 21,594 listings starting at $18,897
2015 Ford F-150 For Sale
190 Great Deals out of 7,578 listings starting at $10,999
2014 Ford F-150 For Sale
380 Great Deals out of 12,548 listings starting at $7,995