What would cause my Crown Victoria to have a big boom to knock off the mufflers

Asked by Annette May 03, 2015 at 12:27 PM about the 1986 Ford Crown Victoria

Question type: Maintenance & Repair

the car was having a problem staying running or it would just shut off when you stopped.
So we replaced the wires and spark plugs. Basically a tune up. And next thing I knew
there was a loud explosion sound. I am not sure what happened? Can anyone help?

4 Answers

420

Bad plug replacement, wrong gap to plugs, misfiring occurs when the firing order of plugs is wrong. Some years were recalled for fuel system problems and fires to the engine. Check ford recalls and appropriate manual for your car.

20

If you havery coil packs I doubt you have wrong firing order. Secondly the car had an obstruction or blockage caused back up pressure then an ignition and boom. Does it run without the numbers fine if so then no problem. If not then yeah you have a problem. You gap is .54 I believe and most plugs are if for this car at least mine email Were spot on gap out of the box. Old numberschool may have changed but 104 not 103 hot plugs. Not cold plugs is right accel. Same as orig.

20

This is the Internet could be wrong. Sorry you said wires. Still question remains does it run fine without the mufflers or not if so no problem.

Your Answer:

Crown Victoria

Looking for a Used Crown Victoria in your area?

CarGurus has 5 nationwide Crown Victoria listings and the tools to find you a great deal.

Postal Code:

CarGurus Experts

  • #1
    Tracy Hooks
    Reputation
    4,810
  • #2
    Bob Beaman
    Reputation
    2,710
  • #3
    Gene Arnett
    Reputation
    1,930
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford Mustang
49 Great Deals out of 1,268 listings starting at $4,995
Used Dodge Charger
36 Great Deals out of 614 listings starting at $4,888
Used Ford F-150
299 Great Deals out of 15,725 listings starting at $1,712
Used Ford Taurus
82 listings starting at $4,880
Used Toyota Camry
49 Great Deals out of 940 listings starting at $2,212
Used Chevrolet Impala
11 Great Deals out of 118 listings starting at $5,595
Used Chevrolet Camaro
32 Great Deals out of 345 listings starting at $10,500
Used Honda Accord
40 Great Deals out of 908 listings starting at $2,799
Used Ford Ranger
15 Great Deals out of 1,439 listings starting at $2,888

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.