Diablo sent me to pre-ignition HELL!
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From: LaGrande, OR
Diablo sent me to pre-ignition HELL!
I just got my chip in tonight and wow, the power gains are very noticable. However, when ever I put the pedal to the floor my engine goes into a melee of knocks and pings. I'm running 92 octane gas right now but it is freeway gas and my experience tells me that it is lower quality. But is there some other issue with my engine that may cause this?
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From: Kokomo
I would pull the chip and run the bad gas out and then reinstall when you know you have better gas or drive very smooth and easy, as to not put a load on the engine, spark knock is very very bad, it's good to know that the chip knocks on bad gas, that means that Ken gave you a good tune that is making a lot of power, don't keep driving it the way it is, I would find a place that sells good gas and stick with it. This is deffinatly not Kens fault, but your'se or the gas station's supplyer, I guess I would run some octane booster, but that only adds like 0.02 more octane. He could have made a mistake and programmed it for 108 octane or something crazy, but I really dought that happened.
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From: LaGrande, OR
So I ran it down to 1/4 tank and put in chevron 92. The ping has all but gone away, but there is still an occaisional one at WOT at high RPM's. I'm thinking in couple of tanks it will have gone away. However, this particular engine has always had a small ping on 87. I do not think that this is the chips fault, I just would like to get rid of it. And also that whole tank was 92, but it's been my experience that gas on the freeway in Hood River tends to be bad. Unfourtunatly the convience factor overided any worry of bad gas.
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From: Kokomo
So stay out of WOT untill you get ALL good gas in it, spark knock is VERY bad, even just a little bit of it does big harm! Try to keep your foot out of it untill it goes completly away, then give it all the hell you want! If it refuses to stop pinging even after a couple tanks then you are going to need to send it back and have it slightly de-tuned, you want it as close to spark knock with out knocking as possible, timing adds big power, the more you can safely run the better.
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From: Kokomo
Like I said, you might have to get the chip slightly detuned, I would rather have a few less hp then to harm the engine, hope it all works out, were here to help!
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From: Apex, NC
Try some fuel system cleaner before you get the chip detuned. Any little buildup on the pistons or combustion chambers can change the compression ratio and cause pre-ignition. Also stick with a good name brand gas that has additves for keeping the fuel system clean.
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From: LaGrande, OR
Update
Put a bottle of fuel sys cleaner and 4 tanks chevron 92. Knock is all but gone. There is still an occasional ping but is very rare. Thinking about trying a colder plug. Do they make a colder double platinum plug?
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I would switch over to a NGK plug, When I had my L I was to lazy and never switched over to a colder plug, and that led to a engine problem. I the ping was virtually unnoticable. To answer your question though, I don't know. 
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