Ok, So my car is pulling timing. Still no clue why.

I actually had the same problem with my 2012 3.7. I had an annoying knock at part throttle. I tried race fuel, fuel system cleaner,returning back to stock tune. the only thing that helped was a cleaning with carb cleaner.with mine I hooked it up to the crankcase vent on the passenger side of the motor. easiest thing to do is get a cooling system rubber plug assortment. find the one that fits tightly on the port on the intake then make a hole just small enough to put the straw through for the cleaner.while it's running give it small shots so you don't kill the engine.don't do too much because it will cause a code O2 sensor stuck rich condition. hope this helps

Grimace427 said:

Watch the crank sensor signal when doing your datalogging. It may be erroneously be detecting misfiring.

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this.

Just datalog every paramater you can for a day.

Could be something tripping the knock sensor as mentioned or it could be a throttle or MAF calibration issue or even Ford's "torque managment". I'm guessing it feels sluggish?

I had my OBDII up yesterday because often my car will randomly bog if I'm too aggressive with the throttle. Sure enough I couldn't get it to open past 69% so you know the ECM is cutting in a lot. This was in a strait line so TC or stability shouldn't be a factor.

jdbrand said:

Ok so i have posted a couple threads and so far the only thing we have been able to figure out for sure is that it is pulling timing between 4k and 6k, and pulling timing bad.

So far i have re-flashed it with a bama tune, returned it to stock, replaced the MAS, checked every place i could think of that it could be pulling in un-metered air. I'm lost at this point.

I'm curious if anyone has broke valve springs or anything crazy like that to cause the knock sensor to go ape **** like this thing is.

Tomorrow I'm going to change the plugs and log it on a stock tune and see if i can figure it out that way. Aside from that I'm going to pull the heads and see if there is any major mechanical issues.

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jdbrand,

There's a lot of information in this thread, let me try and pull everything together for you. Timing is commonly a problem for one of three reasons.

1. Temperatures - If the Intake Air Temps or Coolant Temps get to a certain point timing will be pulled for safety.

2. Knock Sensors - Knock Sensors are always listening for problems. It could be a loud exhaust system or actual detonation in the cylinders. We don't touch the knock sensor calibrations on 2011+ Mustangs because their ability to pull timing is important to the safety of the tune.

3. Fuel - It's important to stick to the octane level that the tune is set up for. You can always run a higher octane than the tune is set up for, but you can't run a lower octane. It's also possible that you could pick up a bad tank of gas. Your best bet is to stick to name brand gas stations such as Sunoco and Shell, etc..

Anything outside of these three symptoms is pretty uncommon. There are things like fuel filters being dirty and engine blow-by that could affect the quality of the fuel. However, in most cases, it relates back to one of these variables.

If you give the Bama team a call, they can datalog with you and pinpoint exactly what's going on. They'll know the exact parameters to datalog to figure out what the culprit is. You can reach them at 888-226-9764 at the hours listed in my signature below! I hope this helps. I'm confident they'll have your Mustang running great soon.

-Dan

Thanks for the input guys.

Dan, Thanks a bunch. I'm going to log the car this evening and get that stuff sent over to your guys and see what you can come up with. I don't think its a ghost knock from the exhaust, its just not that loud and i have factory shortie headers right now. Who knows, I'll get some logs to you guys tomorrow.

jdbrand said:

Thanks for the input guys.

Dan, Thanks a bunch. I'm going to log the car this evening and get that stuff sent over to your guys and see what you can come up with. I don't think its a ghost knock from the exhaust, its just not that loud and i have factory shortie headers right now. Who knows, I'll get some logs to you guys tomorrow.

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jbrand,

Sounds great. Once we get our hands on the datalogs the Bama team will get you squared away quickly! Hang in there, you'll be enjoying that 412RWHP again shortly .

-Dan

Well pretty much back to square one. Sent my logs off and was basically told its something mechanical.

I'm lost at this point. I have no clue what it could be on the mechanical side that isn't throwing some for of CEL. I've got a couple logs if any one wants to take a look and see if they have any clue what it could be. I'm not going to sit here and blow smoke, i have noe clue what 99% of these logs mean.

AMDanBailer said:

jdbrand,

2. Knock Sensors - Knock Sensors are always listening for problems. It could be a loud exhaust system or actual detonation in the cylinders. We don't touch the knock sensor calibrations on 2011+ Mustangs because their ability to pull timing is important to the safety of the tune.

-Dan

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Just out of curiousity, how much timing does the computer pull and do your tunes leave that amount in?

Need fuel injector stats

Need fuel injector data to make a final judgement. But from what you have so far, it looks like the timing is being pulled because the ECU can't get enough fuel into the engine. Data speaks for itself, but my guess to why is that between the Boss intake and the CAI, it's taking in too much air and can't get enough fuel to get the AFR it wants. The only thing it can do is pull timing. Didn't see any knock, but I didn't look too far. The fuel trim kind of jumps out at you.

Is MAF frequency the only thing you can data log from the maf or can you actually get the flow rate?

Calibrating the maf is not difficult and should be done anytime you change an intake or use a canned tune.

I think this would have been pretty easy to spot by watching your aFrs and fuel trims regularly which is probably a good idea with an aftermarket intake.

Was there not a boss specific tune that you loaded when you got the manifold?

Sorry for the questions...im still trying to learn how Ford ecus work and I'm about to start turning myself.

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