Piston Damage

[Rickmartin2nd]

Paragraph breaks would be very helpful.

Yeah i apologize this is actually my very first thread on any forum site and I used voice to text a lot of the thread but I will try to remember that thanks

 

[Lee Peterson]

Is that short term knock or long term? After the PCM see's ST spark knock it will start to permanently pull timing. My truck tuned monotoring with Diablo tuner only ever see's 2.0 St sometimes when climbing a hill at like 2600 rpm with a greene 87 tune running 87 the rest of the time it stays at 0.

 

[2020PW]

Sounds really odd. Got pics of the damage?

 

[Xsen]

For what it's worth - I've seen a custom tune, presumably done by Diablo, for a truck that had its original engine swapped for a 6.4 from a low mileage SRT8. The purpose was to adapt the calibrations but keep the original ECU. Long story short - that tune had everything related to knock retard zeroed out. Plus they zeroed out the component protection enrichment. I never figured what could really be the purpose behind such alterations, but I'd say that it's a straight road to a severe engine damage.

This could be your case as well, although I always thought that it was just some sloppy custom job, and their production tunes would be better.

 

[Scottly]

Yeah i apologize this is actually my very first thread on any forum site and I used voice to text a lot of the thread but I will try to remember that thanks

Learn to ignore ****** like that. I'm sure he has a chubby from correcting those who's writing skills are not up to his personal standards, as he hides behind his own weaknesses...

 

[Rickmartin2nd]

Sounds really odd. Got pics of the damage?

 

[Rickmartin2nd]

Is that short term knock or long term? After the PCM see's ST spark knock it will start to permanently pull timing. My truck tuned monotoring with Diablo tuner only ever see's 2.0 St sometimes when climbing a hill at like 2600 rpm with a greene 87 tune running 87 the rest of the time it stays at 0.

wow thats good to know. no my knock sensors were always actively moving similar to o2 sensor just bouncing all around

 

[1999 White C5 Coupe]

What about this second engine that’s never ran anything other than 93 octane on the 91 tune. And when I started suspecting trouble this 2nd. Time around I started monitoring the knock sensors and I’m not exactly sure what the scale is (voltage or resistance, or millivolts, etc.) but the values would constantly fluctuate between 0.5 - 2.0 and never stay at any value for any length of time like maybe a half second or so . Similar to how an O2 sensor fluctuates. I checked around but couldn’t get a recommended or suggested value as to what they should read. So of course I had to rely on Diablo Sport tuning support, so when I inquired about these values I was told I should only be concerned if I see values that are 4.0 and above or any value that would indicate for any length of time . Like 4.0 and above for more than one second. But I never saw this like I said the highest reading I ever logged and/or witnessed was around 2.0-2.2 maybe but immediately back down. So my thinking is the only sensor the ecu reads to adjust improper timing is these knock sensors. I’m just too new o all of this modern technology and performance tuning but every precaution a reasonable person could and would take to prevent damage to my truck or engine I really feel like I’ve done all the homework and been very skeptical about tuning my engine, way too much to be having these kinds of issues but deep down I know something has failed me with my first performance tuning experience and it’s really unfortunate that so many people can have such great luck with the same tunes I was supposed to receive with my purchase in the performance tuning game. And exactly how much mistiming would / could cause this kind of damage? And would /could I really have never heard the pre-detonation or whatever the conditions are that causes this piston deterioration until a piston breaks and would / could I have missed the wrong timing conditions twice even when looking for such issues. Is this a zero tolerance condition that is a once and done situation.?

See post #8.

 

[Pjc87]

I’m running a custom 91 octane tune from hemifever, he had me send him log info with knock sensor, knock sensor 1 and knock sensor 2.
I believe I also sent the lambada stats, the fuel trim stats.
I’ve only noticed my knock sensors reading around 1.0 at the highest so far, but I will watch that a little more closely at higher rpm’s.
What spark plugs were you running in both engines?

 

[chri5k]

If you like replacing engines keep the tuner and buy another engine. I don't like replacing engines so I would ditch the tuner. It appears the tunes are too lean and/or spark overly advanced.

I have never seen a tune advertised to destroy engines so it is no surprise the tuner folks say "We've never seen that before".