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  #1  
Old 06-19-2010, 01:06 PM
longbow longbow is offline
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Question Ping when going out of MDS- after mods

Has anyone heard of this before ? I installed a DiabloSport tuner ( 87 octane tune )and Catch Can , I've noticed a ping when the truck goes out of MDS on acceleration , (its only one almost sounds like a valve ) .

09 -1500 4x4 5.7
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Old 06-19-2010, 01:52 PM
erm
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It's running a bit lean during the switch because the fuel hasn't gotten to the other 4 cylinders quick enough.

Not sure how you'd fix that, though, unless you turn off MDS with the tuner.
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Old 06-19-2010, 02:34 PM
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Michael, could it be that the timing is coming on a bit too agressively or perhaps low quality fuel?
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Old 06-19-2010, 02:57 PM
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I agree, Randy. It's just hard to tell from the info provided. I suspect it might be the fuel octane rating. Even if the timing is stock, an 87 octane or even an 89 octane, might be too low. I know they recommend at least 89, don't they?

My HEMI does NOT like 87 or 89 octane fuel. I don't have MDS but it just pinged like crazy, especially during hot ambient temps pulling a long hill.
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Old 06-19-2010, 03:01 PM
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You must be throwing a lot of advance at yours.
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Old 06-19-2010, 03:05 PM
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Mine has a canned 91 octane Predator tune on it.

I didn't check the fuel or timing curves but even before I put the Predator on it, it pinged. I'm sure the program does change those parameters. I also know I can add a bit more fuel with the tuner under WOT conditions. But I don't need to. The air/fuel ratio at WOT is right where it needs to be.

The top line in the chart below is stock air/fuel ratio at WOT (14.2:1.0) which is very lean. You can see it drop sharply to a rich condition at around 4300 RPM. With the Predator I start a bit leaner (14.6:1.0) but it dips quickly as we get into the power band around 2630 RPM and continues downwards as the engine demands more fuel. 12.5:1 to 12.8:1 seems to be the sweet spot for the HEMI. Each engine is a bit different and that's why that tool allows you to add or delete fuel to fine tune the ratio. However, don't try it unless you absolutely know what your air fuel ratio is.


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Old 06-20-2010, 01:23 PM
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Default Thanks Guys excellent feed back

I'm going to look over this info and try a higher octane .
My suspension is that after I installed the Catch Can from Diablo (one month later) , I began to notice this metallic ping , although the weather here has been cool and driving with the windows down is the only way to here it . It does almost sounds more mechanical than internal combustion, like a valve slapping up or down hard and it is only a part of a second . I don't have the problem on WOT, or maybe I just can't hear it .



Another thing I found , is that if I use the manual shift select up to 5th gear , it disables the MDS, it runs through the gears from stop to speed but never allowing the MDS on .

Last edited by longbow; 06-20-2010 at 01:33 PM.
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Old 06-20-2010, 02:28 PM
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I know you said you run the 87 tune but are you running 87 octane fuel? Michael is correct, the Hemi calls for mid-grade (89 octane) fuel.
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Old 06-20-2010, 02:42 PM
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Good point. I don't know how (if it does at all) the 87 octane tune changes the timing to avoid a ping on an engine that requires 89.
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Old 06-20-2010, 10:26 PM
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Default Refueled At 91 Octane Or is it the Catch Can ???

You guys are right , it definitely is ping ( detonation problem)

While I was at Costco , they only have 87 and 91 Octane , so I had about 1/3 tank of 87 left before refueling , toped up with 91 . Running back on the highway about 2 miles didn't seem to change anything but maybe too soon to tell.

[/B] I think I'll need to reverse engineer the Catch Can to elliminate it as a possible problem ( I belive the problem started after I installed it . The only problem is I cut the boots to get it off the OEM hose , I'll need to reorder (Damn)

Here is an excerpt from this web page[B] Read #2 EGR,
http://www.misterfixit.com/deton.htm

A DOZEN WAYS TO PREVENT DETONATION

1. Try a higher octane fuel. The octane rating of a given grade of gasoline is a measure of its detonation resistance.
If switching to a higher octane fuel fails to eliminate a persistent detonation problem, it probably means something else is amiss. Anything that increases normal combustion temperatures or pressures, leans out the air/fuel mixture, or causes the engine to run hotter than normal can cause detonation.

[B]2. Check for loss of EGR. The Exhaust Gas Recirculation (EGR) system is one of the engine's primary emission controls. Its purpose is to reduce oxides of nitrogen (NOX) pollution in the exhaust. It does this by "leaking" (recirculating) small amounts of exhaust into the intake manifold through the EGR valve. Though the gases are hot, they actually have a cooling effect on combustion temperatures by diluting the air/fuel mixture slightly. Lowering the combustion temperature reduces the formation of NOX as well as the octane requirements of the engine.
If the EGR valve is not opening, either because the valve itself is defective or because its vacuum supply is blocked (loose, plugged or misrouted vacuum hose connections, or a defective vacuum control valve or solenoid), the cooling effect is lost. The result will be higher combustion temperatures under load and an increased chance of detonation.
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