Stock '02 ping on 87, 89 seemed to fix it. - Mustang Evolution

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Old 04-12-2015, 01:48 PM   #1
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Stock '02 ping on 87, 89 seemed to fix it.

Hey guys, so the last day or so my 02 seems to have developed a pretty serious ping at more than 1/2 throttle between the 2k-3k rpm range. I first started noticed it yesterday when the weather finally decided to warm up a bit. I was running a full tank of 87. After lots and lots of driving yesterday up and down the garden state parkway, I managed to run the tank to E this morning. Well about an hour ago I filled up with 89, and upon leaving the gas station I still noticed the slight ping, after about 5-10 minutes of driving it seems to have next to completly dissapeared 👍. Now could this have something to do with the warm weather and the so called "winter" and "summer" gas? Idk if I should stick with 89 for now on and say screw it, or if I should begin to track down what's causing it to ping on 87. Spark plugs less than 20k, maf cleaned recently, air filter cleaned 6 months ago, fuel filter changed less than 20k. and I am on the STOCK TUNE.
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Old 04-13-2015, 01:52 PM   #2
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You didn't mention how many miles are on the car, but here is one thing that can cause pre-ignition.
This is a big block Ford with around a quarter of a million miles on it.


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Old 04-13-2015, 01:58 PM   #3
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That carbon gets red hot and acts like a spark plug, prematurely lighting off the air/fuel charge.
You can see a spot that was staying "lit" in this photo.
And, NO, SeaFoam will NOT remove this! It needs to be scraped off of the pistons and combustion chambers.

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Old 04-13-2015, 02:03 PM   #4
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This may not be your problem but one of the symptoms of this is hyper-sensitivity to temperature changes, requiring more octane the hotter that the OAT gets.

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