NOISE...DETONATION??

[DDSTANG94]

WHEN i give my car wot there is a noise like a metal slapping something or like a loud tic (kinda) but its more like a "tinging" noise.....i think its detonation timing is a 12* on 87 octane....any suggestions???



Thanks guys!!!!

 

[red95gtconvert]

Run some Seafoam through it, put higher octane fuel in or back the timing off a little bit.

 

[Stanger007]

That sounds like detonation that you are hearing.

+1 on the comment above.

 

[RAD]

My car is pinging in hot days but 93 octane fuel cured it.

 

[HISSIN50]

Agreeed. If this is a new noise, it's likely detonation. As everyone said, back your timing down a couple degrees or up the octane.

Good luck.

 

[DDSTANG94]

thanks guys. i think ill try some 93 octane

 

[dstang01]

Does anyone know how many degrees the stock timing can be bumped so that the car will still run safely on 87 octane? Sorry if I hijacked, im just lookin for a quick answer

 

[HISSIN50]

Does anyone know how many degrees the stock timing can be bumped so that the car will still run safely on 87 octane? Sorry if I hijacked, im just lookin for a quick answer

There's no magic number - especially on these ping machines. State of tune, ambient temps, how well the MAF is functioning and many other factors play into it.

You will really just have to experiment. Keep bumping till you start to hear pinging and then back it down 1-2* if it's summertime (you might need more if you do this during the winter). There's a point where power goes down but pinging isnt heard by the human ear (the cars always ping - we just dont normally hear it). This is a reason to not run on the ragged edge of detonation.

Good luck.

 

[DDSTANG94]

one more thought on this problem, mine only does it when the motor is warmed up, if its cold and i give it wot it doesn't make any noise. Also whenthe motor is warmed all and I give it wot, the temp gauge goes up higher than it normally runs.....do u guys still think its detonation??

 

[red95gtconvert]

It sure sounds like detonation to me. I think 10* of timing is all you are going to get by with on 87 octane.

 

[Stanger007]

Yup, sounds like detonation dawg.

 

[StinkinLincoln]

more heat causes it to detonate easier.
to raise the timing, can it be done at idle and then hear the pinging and back it off for does it need to be wound up?

 

[HISSIN50]

to raise the timing, can it be done at idle and then hear the pinging and back it off for does it need to be wound up?

The engine needs to be under load to test for detonation.

 

[StinkinLincoln]

so raise the timing a few degrees and get on it, hear some pinging, then back it down 2 and try it again basically?

 

[HISSIN50]

so raise the timing a few degrees and get on it, hear some pinging, then back it down 2 and try it again basically?

That works.

 

[badstang123]

You are fortunate. Detonation has been the story of my ownership of the vehicle running 91 octane (The best you can get in California) and the stock ten degrees. No matter how many sensors I replace or how much seafoam I run through the thing it still pings.
- Justin

 

[DDSTANG94]

is onyone running 14* with 93 octane without problems or is 12 about all im gunna hett out of 93

 

[94 Black GT]

i know im bringing up an old thread but i was just curios what seafoam is and what it will do?? thanks guys..

 

[94mustangcobra]

what type of plugs are you running too, aren't certain types more likely to detonate than others, wich is why you don't run them on nitrous or blower combos. just tossing the idea out there

 

[HISSIN50]

i know im bringing up an old thread but i was just curios what seafoam is and what it will do?? thanks guys..

A search (on here or Google) will reveal more than you ever wanted to know.
It's just a top-end cleaner.

94MustangCobra is talking about plug heat ranges. Too cold and they foul, too hot and they begin to favor preignition.