ok i have a 04 ford f150 supercrew lowered 4-6" on 24's with 275-30-24s, performance mods are jlt intake sct sf3 tuner with the specific tune for the jlt intake set of 93 octane and also running 93 octane, banks exhaust dumped right after it goes over the rearend, my truck has a cervinis ram air hood ok lets get to the problem my truck runs like a bat out of hell but when im at highway speeds and get on it the motor starts poppin sounds like a machine gun for a couple seconds then it runs like its no bodys business but when i take off from a red light and get on it the motor doesnt make that sound what do yall think and by the way my truck has 76,000 miles on original plugs and a new fuel filter

 

Sounds like it could be detonation.

 

That's what I was thinking what can I do for that new plugs?

 

back off the timing in your tune

new plugs

higher octane gas


sounds like you should be running 91 Premium at a minimum. I'd try to get 93 premium in there

 

Read above I am running 93

 

yeah, totally missed that.


suggest you try another gas station then as well. I had an issue with my blower on the F-150. 1 of the local gas stations and it didn't get along. She ping'ed a tiny bit when I used their gas. Never had a problem with the other local stations. so I avoid it like the plague now

 

Anyone else have a educated guess lol

 

Anyone else have a educated guess lol

 

Sounds like your tune may need a bit of tweaking.

Also, before I had my hydrolocked engine problem due to my bad 05 injectors I noticed some pinging (detonation) with my pHP 93 tune. After the new short block and all new injectors I have no more pinging on that tune. My pinging could have been caused by the bad injectors. Maybe your injectors need some runs with a blend of gas with techron. Just throwing that out there. :o

 

How did it hydrolock?

 

The 05 5.4's had a fuel injector issue. Someone correct me if I'm wrong, but I think the injectors would malfunction and stay open and dump fuel into the engine.

 

O ok well mine is one of the first 04s

 

Heavy carbon build up can increase compression and start detonation where it wasn't occurring before. Knock sensors may not be doing their thing either or not as responsive as they were.

 

Yes it is an 05 5.4 issue, I was just using that as an example of how my engine was pinging.

 

Ok so what do I need to try oh and stealth your mirrors are going out monday