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post #1 of 14 (permalink) Old 08-17-2004, 05:37 AM Thread Starter
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Pinging/Spark Knock

Does anyone have any ideas? I have put 93 Octane in my car and it still is spark knocking. I don't get it? Is there anything to clean or replace that would fix this problem? If I accelerate at a normal pace it doesn't do it, but if I give it alot of gas (over half throttle) it spark knocks.
Any help would be greatly appreciated.

Thanks,
Brad
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post #2 of 14 (permalink) Old 08-17-2004, 07:13 AM
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Do a full tune up: plugs, wires, air filter. If you've never changed the fuel filter change it. Also do a search for cleaning the MAF.

Is your car completely stock?

B

97 T-Bird Sport: Dynomax catback, Removed silencer w/ K&N panel, DReinhart chip, Lightning AGSF12-FM1 plugs/180 stat, Tokico 1.25" dropped stance, bye bye fender gap

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post #3 of 14 (permalink) Old 08-17-2004, 08:54 AM
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post #4 of 14 (permalink) Old 08-17-2004, 09:20 AM Thread Starter
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Where is the octane plug? And yes, it is bone stock!
I haven't done a tune-up either.

And what in the world is seafoam? I've never heard of that before. Someone educate me!

Thanks for the help!
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post #6 of 14 (permalink) Old 08-17-2004, 01:39 PM
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run colder plugs... like 32C's or 22C's... that took care of my friends problem in his bird


autolite 734's i think??? someone will know for sure or just search spark plugs or someting like htat
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post #7 of 14 (permalink) Old 08-17-2004, 07:22 PM
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Quote:
Originally posted by Red96Bird
run colder plugs... like 32C's or 22C's... that took care of my friends problem in his bird

colder plugs? But his engine is bone stock, he said. would running the colder plugs on a stock engine cause problems?

I'm interested in doing this, too. But most people have said it's not good/possible to run colder plugs if the engine is stock...
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post #8 of 14 (permalink) Old 08-17-2004, 07:33 PM
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if you are getting spark knock pull the plugs and tell us how they look.

The brand is real important, you will want motorcraft or autolite coppers.

A cooler plug will just help you fight detonation (knock), its ok to run it on your stock motor, but if you run too cool of a plug you will just foul them.

I'm going to bet that you have some weirdo plugs in there and thats your problem.

This is all assuming that your mass air sensor is clean as a whistle.

AGSF32CF6 is the stock heatrange plug
AWSF22C is one range colder
AWSF12C is two ranges colder and is not for your application.

I would try the 32c's first and see how that goes.

JH
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post #9 of 14 (permalink) Old 08-17-2004, 07:59 PM
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I had the same problem with my stock 97 4.6 w/ 80km miles and tried everything to get rid of the knock that slowly developed after owning it for two years. Here is a run down of the things I tried over a period of six months and their result.

1. 89 octane worked very well and I only heard a few knocks while going up hill.
2. 93 octane took care of all knocks including going up hill.
3. Full tune up with new plugs, wires, fuel and air filters. This got me better mileage but still a knock.
4. one step cooler plugs and back to 87 octane helped.
5. 89 octane with cooler plugs took care of everything but read here that cooler plugs can foul in a stock engine.
6. Seafoam had no change so the knock in my motor was not due to carbon buildup.
7. Cleaned maf but it was not dirty and had no change even with computer reset.

Eventually the check engine light came on and I had the codes read. I don't remember the code but it was for the fuel emissions system. I tracked that down to a bad gas cap that would not seal.

Went to Wal-Mart and bought the cheapest gas cap that would fit. After resetting the computer all was good.
I have since gone back to stock plugs and 87 octane with out a knock for over 8,000 mi.

The moral of the story is if your car is stock and it knocks then something is wrong. Don’t try to alter anything with cooler plugs or pulling the octane plug. I’m not saying that it is your gas cap but I will bet there is some kind of vacuum leak, bad plug, or plug wire.
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post #10 of 14 (permalink) Old 08-17-2004, 08:33 PM
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The other thought is that the MAF may be failing... Starts anytime, but usually after 50k the thing cost me a lotta bucks(even 02 sensors) and grief, finally failed, threw the code, and was replaced... BANG! the end of my troubles, after replacing everything else, go figure.........good luck
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post #11 of 14 (permalink) Old 11-29-2004, 04:30 PM
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My T-Bird is bone stock - it knocks at WOT on ANY octane above 3000 RPM! It is fine at part throttle on 89 octane. Car is fully tuned up - just cleaned the EGR ports, and ran Sea Foam thru it - didnt matter! Also cleaned the MAF, cleaned everything!

I have personally never seen a computer controlled Ford that didnt knock at WOT. I am surprised this isnt the #1 topic on the forum!

I am looking to change to AWSF-22C plugs, but cant find the damn things!

Would like to try the Octane plug mod - anyone got a valid link? The one above doesnt work anymore.

Thanks!
Al

97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
Previous Fords:
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles
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post #12 of 14 (permalink) Old 11-29-2004, 05:02 PM
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its not a mod, you just pull the plug out, and it retards the timing.

Its a grey plug near the wiring harness on the passanger side of the engine bay. If its factory it has some black electrical tape covering it.

Pull the plug and it retards the timing.
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post #13 of 14 (permalink) Old 11-29-2004, 05:32 PM
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T6Rocket; my motor doesnt ping... however if I get a bad load of premiun gas, My octane bridge is hardwired to a switch in the dash....
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post #14 of 14 (permalink) Old 11-30-2004, 07:40 AM
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Quote:
Originally posted by JustinH
its not a mod, you just pull the plug out, and it retards the timing.

Its a grey plug near the wiring harness on the passanger side of the engine bay. If its factory it has some black electrical tape covering it.

Pull the plug and it retards the timing.
So, this is what advances the timing, and pulling it will run base timing only - used for checking the timing?

My knock is only at WOT above 3000 RPM. The car runs great otherwise.

I just pulled the plug on the harness that has a huge controller mounted to the shock tower - that also goes to the MAF - is this the correct one? The one I pulled last time was on the harness that runs over the shock tower.

I will run it after work and see!

Thanks,
Al

97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
Previous Fords:
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles

Last edited by T6Rocket; 11-30-2004 at 12:07 PM.
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