Spark Knocking or Exhaust Leak?

70stangcoupe

Founding Member

Nov 12, 2001

2,895

0

0

Winston-Salem, NC

Sep 2, 2004

#1

• Sep 2, 2004

• #1

Getting sort of a rattling sound when I get on the gas, and I can only hear it with the windows up.

On the highway in 5th gear at 65 mph, If I floor it, I can hear a pinging sound, kind of like a marble in a metal container bouncing around. My mods are in my sig, so I figured I was spark knocking and needed to run a higher octane. I filled up with 93, and after 20 miles, it's still doing it.

Could it be spark knocking, or could my professionally installed BBK o/r X be leaking?

 

70stangcoupe

Founding Member

Nov 12, 2001

2,895

0

0

Winston-Salem, NC

Sep 2, 2004

#2

• Sep 2, 2004

• #2

...Please?

 

R

Roger_4.6_96

Founding Member

Jul 16, 2002

1,209

0

0

Reno,NV

Sep 2, 2004

#3

• Sep 2, 2004

• #3

Pinging Detonation. I had the same Problem and got rid of it with octane booster.

You might need

1. Octane Booster
2. Fix Your Timing
3. And if it only does it when its hot you probally need better cooling system.

 

70stangcoupe

Founding Member

Nov 12, 2001

2,895

0

0

Winston-Salem, NC

Sep 2, 2004

#4

• Sep 2, 2004

• #4

How can I fix my timing? I obviously dont want to run octane booster with every tank.

Why will I need a better cooling system if it didn't ping when the car rolled off the factory floor?

Can I use a Steeda Timing Adjuster to move my timing back to 87 Octane?

 

02LaserRed2V

New Member

Jul 30, 2004

379

1

0

Augusta, GA

Sep 2, 2004

#5

• Sep 2, 2004

• #5

*bump*

I have the same problem also. And my "Service Engine Soon" light is now on. I think my ride has lost some "giddy-up" as well, because of that.

 

R

Roger_4.6_96

Founding Member

Jul 16, 2002

1,209

0

0

Reno,NV

Sep 3, 2004

#6

• Sep 3, 2004

• #6

Probally something in the fuel system. get some octane booster and see if it burns it out of there.

 

70stangcoupe

Founding Member

Nov 12, 2001

2,895

0

0

Winston-Salem, NC

Sep 14, 2004

#7

• Sep 14, 2004

• #7

Fuel system cleaner or octane booster?

 

dbucfan

New Member

Aug 13, 2004

23

0

0

Indian Trail, NC

Sep 14, 2004

#8

• Sep 14, 2004

• #8

check to see if the egr has come loose from the exhaust pipe

 

BMan5150

Founding Member

Feb 19, 2002

309

0

16

Columbus, OH

Sep 14, 2004

#9

• Sep 14, 2004

• #9

70stangcoupe said:

Getting sort of a rattling sound when I get on the gas, and I can only hear it with the windows up.

On the highway in 5th gear at 65 mph, If I floor it, I can hear a pinging sound, kind of like a marble in a metal container bouncing around. My mods are in my sig, so I figured I was spark knocking and needed to run a higher octane. I filled up with 93, and after 20 miles, it's still doing it.

Could it be spark knocking, or could my professionally installed BBK o/r X be leaking?

Click to expand...

It's spark knock/ping/predetonation. Considering you've got a 1997 GT, I'm guesssing you also have a fair amount of mileage on your car. Regardless, get some electrical component cleaner, remove your MAF (carefully - and I think it takes Torx security bits) and clean your MAF. Bet that fixes your pinging/preignition problem - especially since you are already running 93 octane. Good luck and report back! This is a cheap fix too, by the way, even if you have to buy a few torx bits!

 

StangDriver5650

New Member

Mar 5, 2003

115

0

0

Atlanta, Ga

Sep 14, 2004

#10

• Sep 14, 2004

• #10

Good advice, I think that many people overlook the importance of keeping a clean MAF. I clean mine every 15k miles just to make sure.

 

twogts4us

15 Year Member

Apr 1, 2004

4,188

12

79

Dunedin, FL

Sep 14, 2004

#11

• Sep 14, 2004

• #11

Sounds like the addition of the O/R X caused you to go lean. You asked about "moving the timing back to 87 octane" - has your timing been adjusted? Do you have a chip or tune of any sort that bumped your timing? Did you just get the O/R X installed and then this started happening?