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2007 Escalade
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26 Posts
Discussion Starter #1
Recently purchased a Diablo Intune 1000 and downloaded the 91 octane tune. I also adjusted the rev limiter and shift points to 500 rpm higher than stock through the first 3 gears. I always run premium 91 octane fuel through a brand name fuel supplier and my 07 Escalade only has 45k miles. Problem im having is at the high end of first and second gear theres a noise coming from the engine. Sounded like detonation to me but when I called Diablo they said the computer would pull timing back long before I ever heard it. They also said these 6.2L engines are known for lifter noise and that's what Im hearing just before each shift. I found it strange that such a refined engine as the 6.2 would not be able to handle an extra 500 rpms. Has anyone else had this problem and does anything that Diablo said make sense?
 

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2009 AWD Escalade Ultra Luxury Raven Black
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1,800 Posts
Yep, makes perfect sense. Some trucks were worse than others. I have mine adjusted to shift at 5800rpm through all gears, no noise. However, my truck has zero lifter noise.
 

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2010 Premium w/ ALL options + 2004 Pontiac GTO LS6 "Beast"
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1,196 Posts
Lifter noise is going to be more prominent at lower RPMs. At higher RPMs they should be sufficiently pumped up with the higher oil pressures. I would be wary of higher RPM lifter noise as you would hear more exhaust as the RPMs increase. If its loud when revving higher then you may have other more serious issues. You could wind up spinning a lifter and destroying a cam in a matter of minutes if you have issues. Does the noise increase/stay same/decrease while under load?
 

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2007 Escalade
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26 Posts
Discussion Starter #4
The noise is definitely only at high rpm, just before each shift. It also only is heard with the rev limited increased. If you run it without the tune and at the stock shift point, it will shift all day long without ever making a sound.
 

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The noise is definitely only at high rpm, just before each shift. It also only is heard with the rev limited increased. If you run it without the tune and at the stock shift point, it will shift all day long without ever making a sound.
I would just stick with the stock tune then unless you look forward to some repairs.
 

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2010 Premium w/ ALL options + 2004 Pontiac GTO LS6 "Beast"
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1,196 Posts
No I think this is good that he has found a problem. Tune or not, there should not be any noises coming from the engine. This is your golden ticket to find and repair the problem before it just simply destroys the engine. Not many people get the opportunity to dodge a bullet!
 
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