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Author
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Topic: engine knocking when at a stop.???
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1EVLSNKE
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Member # 4789
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posted
 
 
i have a 96 mustang 4.6 supercharged.it started making a knocking sound when at a stop,it wasnt making this sound before.i changed the spark plugs,i went from motor craft to ngk v-power and i gapped them at .40. could that be the problem?? other than that knocking sound the car runs fine. i need help??
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LS WHAT
ORGANIZATION
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GM INC,1 Sic formula(FRDEATR)
Posts: 422 | From: SAN JOSE | Registered: Aug 2004
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94gt
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Member # 3060
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posted
arent those ngk's platinum? I know that you are never supposed to run platinum plugs on a s/c car.
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2020 Explorer ST
2011 Silver Raptor 'Screw
Posts: 5777 | From: Beavercreek, OH | Registered: Jul 2003
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1EVLSNKE
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Member # 4789
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posted
they are iridium copper spark plugs. could that be the problem???
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LS WHAT
ORGANIZATION
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GM INC,1 Sic formula(FRDEATR)
Posts: 422 | From: SAN JOSE | Registered: Aug 2004
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94gt
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Member # 3060
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posted
if the only thing you changed is the plugs, that would be your issue. check the gap on the new ones and try the motorcrafts again
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2020 Explorer ST
2011 Silver Raptor 'Screw
Posts: 5777 | From: Beavercreek, OH | Registered: Jul 2003
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Joooestang66
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Member # 2828
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Sounds like spark knock, spark knock isn't good.
Posts: 581 | From: Elk Grove | Registered: May 2003
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SmokinLX
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Member # 1684
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posted
How much boost are you runnin? Do you have an aftermarket ignition?How long after the spark plug change did you notice the noise? Good luck
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Dont claim power if ya cant mile per hour. 10 second AOD
Posts: 4388 | From: East Bay | Registered: Aug 2002
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1EVLSNKE
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Member # 4789
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posted
its been 300 miles since i installed the ngk. what ive noticed is that it starts to make that knocking sound and then goes away and them comes back. what are some good spark plugs for a supercharged 4.6, think its running 8pounds of boost or so. need help.....
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LS WHAT
ORGANIZATION
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GM INC,1 Sic formula(FRDEATR)
Posts: 422 | From: SAN JOSE | Registered: Aug 2004
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Fostang
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Member # 3752
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posted
Pull out the plugs and check em.
[ August 08, 2005, 09:47 PM: Message edited by: Fostang ]
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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h8louzn
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Member # 1075
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posted
quote:
Originally posted by Joooestang66:
Sounds like spark knock, spark knock isn't good.
Wow, I have never heard of spark knock at idle.
Don't think that would be it!!
Posts: 593 | From: Sac. | Registered: Mar 2002
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92stangLX
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Member # 3252
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posted
Check your plug wires. I had one of mine fall off and it sounded like I had a knock or valve tick.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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1EVLSNKE
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Member # 4789
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posted
all wires look good,since the spark plugs im running are NGKs tr-55 and there stock heat range and i heard that isnt good.i was told to run colder spark plugs.so i went out and got some motorcraft -22c (ford lighting)spark plugs that are colder than stock and im gapping them at .34 ill see how that works out. thanks to everyone for their input. ![[patriot]](graemlins/patriot.gif)
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LS WHAT
ORGANIZATION
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GM INC,1 Sic formula(FRDEATR)
Posts: 422 | From: SAN JOSE | Registered: Aug 2004
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1EVLSNKE
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Member # 4789
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posted
i took off the ngk spark plugs and 7 of them where kind of green from the hook,and 1 of them had the hook smashed and was full of oil. what could of caused that??? need help.. ![[Confused]](confused.gif)
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LS WHAT
ORGANIZATION
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GM INC,1 Sic formula(FRDEATR)
Posts: 422 | From: SAN JOSE | Registered: Aug 2004
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TRIXSNK
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Member # 2844
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posted
quote:
Originally posted by BLOWN 4.6:
i took off the ngk spark plugs and 7 of them where kind of green from the hook,and 1 of them had the hook smashed and was full of oil. what could of caused that??? need help..
Either the electrode was damaged on install or something in the combustion chamber made contact with it.
Pics would help.
How does the oil look any particles?
Possibly bent or broken valve?
A compression test may help if the car is running rough.
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9 Sec EVO 9 is GONE!
New project in the works.......
Posts: 3740 | From: Bay Area | Registered: May 2003
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1EVLSNKE
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Member # 4789
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posted
the car is running fine,the only thing is that at a stop it sometimes makes a kncking sound???
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LS WHAT
ORGANIZATION
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GM INC,1 Sic formula(FRDEATR)
Posts: 422 | From: SAN JOSE | Registered: Aug 2004
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CDT
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Member # 5004
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posted
quote:
Originally posted by BLOWN 4.6:
i took off the ngk spark plugs and 7 of them where kind of green from the hook,and 1 of them had the hook smashed and was full of oil. what could of caused that??? need help..
broken piston, for sure.... Come on down and get a quote on an engine...
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Custom Dyno Tuning
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Home of Flat Fee Tuning For All Cars, Trucks and SUV's, EFI & Carb, SCT, AFR, Dynatech, STS Turbos, N2O Refills
Posts: 1053 | From: Hayward | Registered: Nov 2004
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stoauto
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Member # 2803
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posted
yeah, time for a new motor.
Posts: 1054 | Registered: May 2003
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TRIXSNK
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Member # 2844
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posted
CDT and Stoauto know what they are doing so not surprised to hear such an immediate and what seems to be a definitive answer.
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9 Sec EVO 9 is GONE!
New project in the works.......
Posts: 3740 | From: Bay Area | Registered: May 2003
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BCINGUU
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Member # 2397
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posted
You need to watch your plug depth. Different heads have different plugs. What heads are you running, and what plugs? I sincerely hope your plugs aren't too long.
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93 Cobra #4563 347ci 12.0@118 505rwhp 524tq
90 GT "Saleen Cobra" style convertible 347ci
67 GT "Eleanor" style coupe 347ci
Posts: 1425 | From: San Jose, CA | Registered: Jan 2003
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h8louzn
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Member # 1075
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posted
Evan don't know squat!! ![[Wink]](wink.gif)
Posts: 593 | From: Sac. | Registered: Mar 2002
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1EVLSNKE
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Member # 4789
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posted
thats funny cause the car has been running fine ever since i changed the plugs..
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LS WHAT
ORGANIZATION
VICTORIES:
GM INC,1 Sic formula(FRDEATR)
Posts: 422 | From: SAN JOSE | Registered: Aug 2004
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Eddie510-
CAFords OG
Member # 2354
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posted
run it a day or to now and check a sparkplug again see how it looks, eddie
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"I like to be more politicaly correct than what I really believe so I can get more frinds here on CaFords"-Cummings "TIPICKLE"
Posts: 6556 | Registered: Jan 2003
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92stangLX
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Member # 3252
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posted
quote:
Originally posted by TRIXSNK:
quote:
Originally posted by BLOWN 4.6:
i took off the ngk spark plugs and 7 of them where kind of green from the hook,and 1 of them had the hook smashed and was full of oil. what could of caused that??? need help..
Either the electrode was damaged on install or something in the combustion chamber made contact with it.
Pics would help.
How does the oil look any particles?
Possibly bent or broken valve?
A compression test may help if the car is running rough.
Do a compression test. This will tell you a lot about what is going on. Also, you said that you pulled out the NGKs and inspected them. Did you pull out the plugs you just put in and do the same?
Another thing you may want to do is get a stethescope (sp) and find out which cylinder the knock is coming from and then check that plug and see what it looks like.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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BCINGUU
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Member # 2397
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posted
Hey bro, tell us what heads and plugs you have. Post up some pix of the plugs too if you can.
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93 Cobra #4563 347ci 12.0@118 505rwhp 524tq
90 GT "Saleen Cobra" style convertible 347ci
67 GT "Eleanor" style coupe 347ci
Posts: 1425 | From: San Jose, CA | Registered: Jan 2003
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RobertTS
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Member # 1022
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posted
Its a fouled plug what u have there, change the plugs to what you originally had before the knocking sound, Im pretty sure you´ll be ok,,same thing happened to me a long time ago, everyone thought it was a damaged piston but it was only a fouled plug. Try it out.
Posts: 78 | From: California | Registered: Mar 2002
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stangnut
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Member # 5937
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posted
COULD BE A BAD BEARING ,THEN DUE TO THE ETRA CLEARENCE THE PISTON HIT YOUR PLUG, NEED TO CHECK BEARING CLEARANCE.
Posts: 198 | From: vally joe | Registered: Aug 2005
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