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Old 05-30-2015, 04:37 PM   #1
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Engine knock/bog sound

Got an issue where I hear a sound coming from the engine when I accelerate from a high gear (4-5) in my automatic. Best way I can explain the sound is driving a manual and skipping 3rd gear and going to 5th or skipping 4th and going to 6th or overdrive then accelerating. Can't really remember hearing the sound when it was cold out. Just in the past month or 2 while the temps have been high.



Running a bama 87pv2 tune. My thoughts are to try a higher grade gas in case the tune maybe doesn't fully agree with the summer blend around my area. If that doesn't work, I thought about rolling back to my 87s tune to see if it goes away. Can't go back to stock because of my cai.



I guess I don't know if it's the tune or not but thought I'd post it up here to see if anyone had any other thoughts.



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Old 06-02-2015, 09:03 AM   #2
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So, you're saying it sounds like your car is laboring while it accelerates?
What's the RPM's your running while this is happening?


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Old 06-02-2015, 01:00 PM   #3
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Maybe 1500-2000. I know it should drag some coming out of the high gear, but I've never heard this bog down sound...
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Old 06-02-2015, 04:17 PM   #4
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When did you get the tune? Have you tried unhooking the battery for about an hour? Let the car relearn the fuel/air ratios, etc? You won't lose your tune by doing this. Just an easy and free troubleshooting step.
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Old 06-02-2015, 05:58 PM   #5
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V2 tune has been loaded for a few months. I took the car back to stock before loading the V2 tune. I can certainly try it. I used to do the relearn every few months when I had the stock tune to help with the throttle response.


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Old 06-02-2015, 06:53 PM   #6
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Or, return car back to stock and see if it still does it.
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Old 06-02-2015, 07:23 PM   #7
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Can't return to stock right now. My cai requires a tune. The venturi tube is packed away. We are in the middle of moving. Closest I could do is go back to the old 87S tune that worked well just not as dialed in as the V2 tune.


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Old 06-02-2015, 08:02 PM   #8
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Let me know if unhooking the battery helps.
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Old 06-03-2015, 01:21 PM   #9
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You don't have the stock intake to just throw back on real quick
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Old 06-03-2015, 02:44 PM   #10
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Unfortunately no. I bought the car used with the Roush CAI already installed. The stock intake wasn't included. Initially the Roush CAI had the venturi tube installed so that it could run un-tuned.
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Old 06-04-2015, 08:00 AM   #11
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Stopped by the gas station this morning and put in 93...so I have a half tank of 87 and half 93. Hopefully this will smooth things out. If not, plan B. I'm almost positive now it's an engine knock/ping sound I'm getting. I'm hearing it now when I accelerate aggressively and hit 4th gear. Bama has also been in touch so I might do some data logging as well...
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Old 06-04-2015, 08:18 AM   #12
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Well with this type of pre detonation issue, when was your spark plugs last changed? And have you tried a fuel system cleaner and changed your fuel filter? Want to make sure your system isn't being gunked up and ruining your fuel.

Wouldn't hurt to check your tune but these are just other options.
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Old 06-04-2015, 09:13 AM   #13
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I believe the spark plugs are original. 40k miles on the car. Definitely not looking forward to changing those 2 piece plugs. I also believe the fuel filter could be original but that's an easy swap. I use seafoam twice a year in the crankcase and fuel.


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Old 06-04-2015, 09:35 AM   #14
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If I remember correctly, I think the fuel filter needs changed every 20k miles or so? So that might be past due a little. Even though the crank case might be clean, you also want to make sure the tank itself and the fuel lines and injectors are clean also. I usually just dump a bottle of the Royal Purple fuel system cleaner in once a year and top of the tank. Haven't ran in to a fuel issue yet (knock on wood, and not fake wood either).
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Old 06-04-2015, 09:49 AM   #15
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Appreciate the help. Going to do 1 thing a week so I can at least narrow the issue before doing multiple things and guessing. For now I'm going to run this mixed tank through then fill up on 91/93 and see if it changes and go from there. I will post back results...
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Old 06-04-2015, 09:52 AM   #16
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Alright, sounds good. Luckily for the issue you are having, most of the things to try are fairly cheap.
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Old 06-08-2015, 07:51 AM   #17
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After running a 1/2 tank of 87 and 1/2 tank of 93, the pinging/knocking is 99% fixed. I've only heard a few times and the car runs so much better so I'm planning on moving to 93 for rest of the summer. I've got in a request to bama for a 91pv2 tune. I'm planning on running this tune with 93 for the rest of the summer.
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Old 06-08-2015, 09:11 AM   #18
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good plan.
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Old 06-10-2015, 12:04 PM   #19
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Good to hear it went away. Strange noises/activity is always an annoyance when all yyou wanna do is enjoy your car.
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Old 06-10-2015, 12:16 PM   #20
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Quote:
Originally Posted by Kevin.Cook View Post
Good to hear it went away. Strange noises/activity is always an annoyance when all yyou wanna do is enjoy your car.
I hear you... I've never experienced engine knock/ping before so I thought for sure it was something else. I am also truly amazed how much better my car runs on a higher octane gas. Hopefully I will have the 91pv2 tune by the end of the week.
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Old 06-28-2015, 09:15 PM   #21
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Well the pinging came back running 93 on the 87p-v2 tune but only when the temps reach over 90 degrees and the car is warmed up. For some reason, 90 degrees is the magic number. Under that, even a few degrees, no pinging. I went ahead and loaded up a new 91p-v2 so fingers are crossed.


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Old 07-01-2015, 04:43 PM   #22
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How you get it all fixed.

Is the fuel filter replacement interval really 20k miles? I don't recall seeing that in the manual for my V6 and an way past that mark...LOL.
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Old 07-01-2015, 08:16 PM   #23
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Do a kam reset
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Old 07-02-2015, 09:04 AM   #24
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Quote:
Originally Posted by utm18 View Post
Do a kam reset
I used to do the kam reset when I ran a stock tune every few months. Now that I'm tuned, shouldn't the kam reset each time I upload a tune or new tune?
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Old 09-09-2015, 08:06 PM   #25
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Figured I'd post back an update...


Problem has been solved. After replacing the fuel filter, KAM reset, and cleaning the normal stuff, I contacted Bama. I did some basic datalogging and found that my V2 tunes were running lean. They sent me out a 91P tune to test which fixed the pinging issue right away. They then sent me an updated 91R tune. Did some more extensive datalogging to dial it in and bingo, car is running perfect. I would highly recommend datalogging...at first I thought it was cumbersome, but once you get a handle on it, it's easy and can really improve the cars performance.
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Old 09-10-2015, 12:36 PM   #26
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Glad you caught it before that got any more expensive than it had to be! Detonation and pre-ignition can wreck every part of your engine.


Data-logging is the best way to tune besides dyno+data log.
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Old 10-23-2015, 10:40 AM   #27
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I have 1st hand knowledge of low octane + boost
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Old 10-23-2015, 03:13 PM   #28
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I can't tell what the problem is in that pic lmao


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Old 10-24-2015, 09:41 AM   #29
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Detonation on cyl 5. Made piston soup in oil pan.Click image for larger version

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Old 10-26-2015, 10:24 AM   #30
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Wow Mike.

I am working with Bama again to get a small ping fixed, which I believe is fixed with a revision given to me the other day. Seeing this, I'm glad I spent the effort to datalog and get it straight. Bama has been outstanding and very responsive through the entire process.
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Old 10-26-2015, 12:50 PM   #31
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Did you need a wideband sensor to datalog? And what did it consist of doing exactly?

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Old 10-27-2015, 09:22 AM   #32
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I have a SCT X4 from Bama. Downloaded the LiveLink software from SCT. Created a custom config file based on Bama's stuff. Then datalogged directly to the laptop via the X4 plugged in.

Hardest part was creating the config file since there are a lot of options. Creating it while connected to you car was the easiest way since it removed the options that do not apply to your year.
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