2002 Ford Mustang Engine Knocking

Tiny
THEFORESYTHE
  • MEMBER
  • 2002 FORD MUSTANG
  • 4.6L
  • V8
  • RWD
  • MANUAL
  • 138,000 MILES
I've been having a problem with my car misfiring for a while now and am starting to think it could be serious cause its starting to occur more often. When I start my car it will begin to turn over then stop and there will be 2-3 loud metal knocking sounds that com from an area around the cat converters is where it sounds like its coming from. After it misfires the first time I can start the car up normally and it will run just fine. I'm just starting to get tired of hearing that loud knocking in my car the first time I start it and want to know what is causing it and get it fixed
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Wednesday, July 30th, 2014 AT 1:39 PM

10 Replies

Tiny
CJ MEDEVAC II
  • MEMBER
I FEEL SURE SOMEONE ELSE WILL JUMP IN WITH OTHER POSSIBILITIES (THEY USUALLY DO)

MAYBE THE KNOCKING IS THE MISFIRES SETTING OFF RAW FUEL IN THE EXHAUST SYSTEM

IS THE OLE CHECK ENGINE LIGHT ON?

HERE'S MY POSSIBILITY

MAYBE YOUR PROBLEM IS MUCH LIKE MY NIECE'S WAS

WELL, MY NIECE DRUG HER '03 6 CYL. MUSTANG IN HERE THE OTHER EVENING (WELL NOW, A FEW MONTHS AGO)--BEEN SKIPPING AND MOSTLY SHAKING FOR A WHILE.

-THERE WAS NO CHECK ENGINE LIGHT OR CODES

MY FAMILY FEMALE PHILOSOPHY:

DRIVE IT TILL IT WON'T GO NO MORE!

THEY SORTA FIGURED IT WAS THE PLUGS, BUT UPON POPPING THE HOOD WHILE IT WAS RUNNING, IT SORTA APPEARED TO BE HAVING A "LIGHT SHOW" GOING ON UNDER THERE.

WE REPLACED THE PLUGS (THEY HAD 'EM ON HAND), AS IT HAD BEEN TIME TO DO SO LONG AGO. THIS WAS NOT THE PROBLEM THOUGH

BUT THE LIGHT SHOW WAS THREE DIFFERENT PLUG WIRES HAD RUBBED "UNDERHOOD STUFF" UNTIL THEY WERE ARCING ON THE METAL COMPONENTS THEY TOUCHED

THE ALL TIME AWARD WINNER WAS THE ONE THAT WAS RUBBING ON THE BRAKE BOOSTER---IT WAS GNAWED A THIRD OF THE WAY THRU!

THIS TIME WE INSTALLED NEW--LIFETIME WARRANTY WIRES AND I PURCHASED A FEW FEET OF 3/8 FUEL LINE, I CUT THE FUEL LINE INTO VARIOUS LENGTHS--SPLIT THEM AND COVERED PORTIONS OF THE WIRES, EVERY PLACE A WIRE DID OR COULD RUB OR TOUCH ANYTHING.

THAT WAS THE FIX FOR HER!

HOPE THIS HELPS

THE MEDIC
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Wednesday, July 30th, 2014 AT 3:09 PM
Tiny
THEFORESYTHE
  • MEMBER
Thank you this will help me a lot! I have new plugs coming in tomorrow or Friday and if that doesn't fix it I'll probably replace the could and wires as well I believe that's what you're saying fixed it pretty much replacing all the spark wirings
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Wednesday, July 30th, 2014 AT 6:28 PM
Tiny
CJ MEDEVAC II
  • MEMBER
YES, THE NEW WIRES DID THE TRICK

PROTECTING THEM WITH THE SPLIT FUEL LINE SLEEVING, SHOULD KEEP IT FROM HAPPENING AGAIN! (I DON'T MEAN TO FULLY COVER THEM, JUST PLACES WHERE THEY RUB STUFF)

KEEP US POSTED ON PROGRESS

SHOULD THAT NOT HELP YOU OUT, FEEL FREE TO SUBMIT ANOTHER QUESTION, THIS TIME I'LL LET SOMEONE ELSE HAVE A SHOT AT IT

THE MEDIC
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Wednesday, July 30th, 2014 AT 6:39 PM
Tiny
THEFORESYTHE
  • MEMBER
Ok so I got the spark plugs in and got the installed. Unfortunately one spark plug I can't change myself. The intake manifold is covering up the hole and I can't get the socket down there to remove it and I don't feel comfortable removing the manifold.
But the old plugs were pretty rough. On first start it fired up perfectly but I turned it off and restarted it and it still knocked. Then it fired up right after like it did before. So I don't know what to do now. I don't know how much a shop would charge me just to change that one plug or if theyd even do it for me.

So I'm not sure what to do now.
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Thursday, July 31st, 2014 AT 12:21 PM
Tiny
HMAC300
  • EXPERT
They will change theplug if you ask nicely and let them diagnose it. It might be the converter shield hitting the floor or converter.
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Thursday, July 31st, 2014 AT 1:14 PM
Tiny
THEFORESYTHE
  • MEMBER
Would the converter shield banging cause it not to start though?
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Thursday, July 31st, 2014 AT 2:03 PM
Tiny
THEFORESYTHE
  • MEMBER
Could it be the o2 sensors causing it. I did some reading and a guy was having the same prob and it was the o2 sensors
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Thursday, July 31st, 2014 AT 2:39 PM
Tiny
HMAC300
  • EXPERT
Wouldn't think so ut that is why you scan for codes and check fuel pressure with a gauge so you know where to start. If you disconnected the battery try resetting the anti theft that would cause it for sure. If no manual look online. Also to protect your plug wires go to an autoparts and get wire loom protector you would need 9 or 10mm for your plug wires and you put those around your wires where they rub.
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Thursday, July 31st, 2014 AT 3:32 PM
Tiny
THEFORESYTHE
  • MEMBER
Well the engine light is on cause of the o2 sensors being one of the codes it brings up when I did the service. But there are 13 total check engine codes that came up when I got it checked. So I'm thinking start clearing those codes and that will probably fix it. Also I got an oil change and when midas started it to move it, it misfired they suggested a tune up and said that would most likely fix it. Any thoughts in that idea?
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Thursday, July 31st, 2014 AT 3:41 PM
Tiny
HMAC300
  • EXPERT
Misfires are a b___h to diagnose it's better to have a pro do it because it can be any sensor along with other regular engine stuff as well as injectors. Oil change places only know how to change engine oil and nothing else. Have battery checked for condition because if low it will sendout false codes also clean terminals but disconnecting means you have to reset anti theft. Autoparts check batt for free it can also check charging system at same time.
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Thursday, July 31st, 2014 AT 3:45 PM

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