Sean1980

Thanks for the response. It is doing it only during driving time. It's strange. Now that I removed the intake again, it hasn't done anything out of the norm. NO noise whatsoever. It's driving me nuts now just because I would like to know what is causing it. Either way, the intake will never go on the truck again. I wish I trusted dealerships or I was one of the people who have good luck when they go there. But, I don't have the time or the patience for the "we couldn't reproduce the problem" bit.

Just to be clear: When I put it on, I disconnected the battery and pumped the brakes a few times (to discharge whatever that discharges) to clear everything from the computer. That is the right thing to do, correct? Or, should I drive it for a few hundred miles and then throw it on without disconnecting the battery? I thought I did it all right but I just want to check to make sure. Thanks again fellas.

aiobst

Did it rattle only in certain conditions while driving?

81Ian

I have a 2011 SCREW 5.0 with 68K and have the same noise. It is detonation I know it is, happens under load in high gear or passing. I too have removed my AirRaid Jr intake and this helped a lot. I only buy gas at Chevron and Shell and if I get mid or premium it doesn't do it. I think the stock ignition and fuel mapping is the cause. We don't get 19-20 mpg due to magic these trucks run lean! I would like to know if anyone running a tuner has these problems or if it fixed them? The only other fix I can come up with is colder heat range plugs or maybe just smaller gap? Could anyone else help us with this, its the only thing that bugs me about my truck.

aiobst

Same issue for me, towing can be maddening up grades. Dealer tech heard it and said it sounded like it was ping, but they checked vacuum and it was fine, I first noticed it when I had the air raid Jr intake on, took it off and like you it was better, but not gone. I would also like to know if a tune gets rid of this as I have crawled all over this truck trying to find it. Sounds like it is right on the other side of the passenger footwell.

ncgator8

Are you sure that the maf sensor is installed correctly- oriented and tight? I have the higher- end airaid cai, and I have had no issues with it. If the junior's inside diameter is different from stock, that is your problem, and you will require a tuner to adjust. A different diameter tube will cause the maf to report an incorrect air flow rate which in turn will shoot the wrong amount of fuel into each cylinder. I have read where the fuel mixture can be too lean because of this. Another idea- remove the jr. again and see if the problem goes away. I also agree with using top tier gasoline. Where I live (NC), you can find it closely priced to non top tier around the discount zippy marts. You don't have to pay much if any extra more for it.

ColeLarry

These engines are engineered by Ford. I don't see how we can play with the intake and exhaust and not expect their to be possible problems. Can you get a custom tune and improve performance? Probably. Engine pinging will (not can) cause damage.

Donutz

What u are hearing is spark knock. NOT detonation. It happens on these engines due to the lean condition during low rpm moderate load and summer temps..use premium fuel and it will go away. Detonation sounds like a bad knock. Not a tick. Diesels detonate.....

aiobst

So is there a way to make it go away without spending $0.30/gal more?

ColeLarry

You can hear that and diagnose it? Research this and find out the truth:

Knocking (also called knock, detonation, spark knock, pinging or pinking) in spark-ignition internal combustion engines occurs when combustion of the air/fuel mixture in the cylinder starts off correctly in response to ignition by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front.

The fuel-air charge is meant to be ignited by the spark plug only, and at a precise point in the piston's stroke. Knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle. The shock wave creates the characteristic metallic "pinging" sound, and cylinder pressure increases dramatically. Effects of engine knocking range from inconsequential to completely destructive.

Knocking should not be confused with pre-ignition – they are two separate events. However, pre-ignition is usually followed by knocking.Knocking term is finds in Gasoline engine and Detonation is occured in Diesel engine

Donutz

Whatever you guys want to think i guess is the truth. In the summer run premium fuel and u wont hear the harmless ticking of spark knock due to these engines being leaned out for the MPG that we all want. I dont know where u got ur info but spark knock and detonation are two very different things. Detonation is an explosion. Spark knock is the sound of two flame fronts colliding in the cylinder head.

I dont need to research it for myself.... Not everyone here is a garage mech... I know these engines......