1999 Ford Crown Victoria Logo
Anonymous Posted on Mar 18, 2010

My 1999 crown victoria is misfiring at high speeds even after i changed all coils and put the right gapped spark plugs in i had it checked on a scanner and it said cylinder 5 was misfiring so they took the plug from 5 and switched it with 6 and told me to drive it for a couple of days and when i came back cylinder 4 was misfiring its only doing it at high speeds and i already cleaned the MAF i never had this problem untill they changed the plugs

  • 4 more comments 
  • Anonymous Mar 18, 2010

    i did twice i even put a new set of plugs in and the coils are all in tack and on the plugs perfectly unless theres a problem with the new coils which i doubt

  • Anonymous Mar 18, 2010

    so why would it be misfiring only above 50mph if the firing order isnt correct

  • Anonymous Mar 19, 2010

    oh ok lol the only other code is something about bank 2 in the exhaust but that was like that waaay before it started running like that and thx for the idea about the crank sensor but it says When a crankshaft sensor has failed or is failing, certain timing problems will arise in engine function. The engine may start normally in some cases, but will cut off after a few minutes (or seconds) of operation. More than likely the engine will be unable to start at all. Since the crankshaft sensor is responsible for engine timing, the driver may experience engine backfire or irregular rpm function, if the vehicle starts at all and thats not whats happening im getting a skipping above 45 mph

  • Anonymous Mar 20, 2010

    ive read pretty much everything on the internet on this topic lmao but im goin tuesday to the ford dealer to get a coil stress test cuz i think 2 of 8 of the new coils might not be good so wish me luck plus i still have the receipt so all i have to pay is for the test

  • Anonymous Mar 20, 2010

    ill def. let you kno thx for the good luck ill get back to you this tue

  • Anonymous Mar 20, 2010

    remember that website you told me about on autozone i found this



    Feels Like
    Symptom: Misfiring
    When: At High Speed
    Where: Engine Change

    Priority Action Part Type Cause
    1 Inspect Timing Specification Incorrect Ignition Timing.
    2 Inspect Spark Plug Fouled, Damaged, or Broken Spark Plug(s).
    3 Inspect Distributor Worn, Damaged or Faulty Distributor.

×

1 Answer

toneman2121

Level 3:

An expert who has achieved level 3 by getting 1000 points

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

Vice President:

An expert whose answer got voted for 100 times.

  • Master 775 Answers
  • Posted on Mar 18, 2010
toneman2121
Master
Level 3:

An expert who has achieved level 3 by getting 1000 points

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

Vice President:

An expert whose answer got voted for 100 times.

Joined: Feb 24, 2010
Answers
775
Questions
0
Helped
367993
Points
2445

Not only did the problem switch cylinders, it switched banks. cylinders 5&6 are on the drivers side and 4 is on the passenger side. i would recheck all wires to make sure you have the correctly installed.

cylinder locaton
2 8
dr. 8 7 6 5 7 4 coil

pass. 4 3 2 1 3 5
6 1 coil

  • 5 more comments 
  • toneman2121
    toneman2121 Mar 18, 2010





    although this diagram is marked MUSTANG, it is identical to the cv 4.6l

  • toneman2121
    toneman2121 Mar 18, 2010




    sorry

  • toneman2121
    toneman2121 Mar 19, 2010

    obviously i had the wrong diagram. you have coil on plug ignition, correct? in any case, all your coils, plugs and wires are new. the computer tells the coils when to fire. and the computer receives input from the crank sensor. maybe at that speed the sensor isn't reading right. try cleaning the sensor. is there any other codes showing up? you can go to autozone.com. for a look at engine and ignition circuits.. and just about anything else you need as far as repair goes. register and enter your vehicle. go to repair guides. then go to ignition system.

  • toneman2121
    toneman2121 Mar 19, 2010

    check for vacuum leaks.

  • toneman2121
    toneman2121 Mar 19, 2010
  • toneman2121
    toneman2121 Mar 20, 2010

    yeah man, you need some equipment to test this fault, i have a 97 cv. it had a mis and it was bank 2 coil pack. easy. please let me know what's up! i still think it's a air leak. i'll be glad to be proven wrong. good luck!

  • toneman2121
    toneman2121 Mar 20, 2010

    alrighty then!

×

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

0helpful
1answer

I can start my 1999 crown Victoria with spark plug #1 disconnected but, if I connect it, it will shut off and will blow the fuse

A bad plug boot or coil is shorted bend the boot back and forth it will show a crack or even break if it's to brittle if not that coil or the wire or plug is dhorted out look at the wire for torn insulation making contact to ground if not coils bad and maybe cracked letting the positive voltage escape to ground and blowing the fuse try to check it in the dark while someone cranks the engine the voltage leak will be seen as a spark
0helpful
1answer

How to fix code P0306 cylinder 6 misfire?

Swap spark plug with cylinder 4. Swap COP (coil over plug) with cylinder 2.
If problem moves to cyl 4, bad spark plug.
If problem moves to cyl 2, bad COP.
If problem remains in cyl 6, suspect valve or piston problem.
Start with compression check
1helpful
3answers

I am changing spark plugs on a 199- Crown Victoria. I don't know what the gap is supposed to be, can you help?

Make: FORD
Model: LTD CROWN VICTORIA
Year: 1991
Engine: V8 - 5.0L - FI - - GAS

part Number: RS14LC
GAP: .050" (Original Equipment Manufacturer and/or Original Equipment Equivalent)

Hope this helps (remember to rate this answer).
0helpful
1answer
0helpful
1answer

Car is running rough, afetr spark plug change

make sure no fuel is down in the spark plug ports it will short out the spark
2helpful
4answers

Cylinder 4 misfire on a 2000 crown victoria interceptor

first cylinder 4 is the last on the passenger side . first pull the coil out and check if there is water where the plug is. if there is take the water out and dry up the coil. if you find water you got a crack manifold or a bad intake manifold gasket. if there is no water replace the coil. good luck
0helpful
2answers

P0304=misfire in cylinder 4. coil? spark plug? spark plug wiring. 1999 crown vic 4.6 V8. runs ok, just little cutting out every now and then.

not coil coil it wouldnt fire at all it is either a plug or a wire replace the wire and plugs and that will fix it
Not finding what you are looking for?

1,279 views

Ask a Question

Usually answered in minutes!

Top Ford Experts

ZJ Limited
ZJ Limited

Level 3 Expert

17989 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

15088 Answers

xxxxxx xxx

Level 3 Expert

5117 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...