[4x4crazy12345]

I did the deckplate mod about a month ago and had no problems but when I install my flowmaster 50 series muffler it took about 3 tanks of gas but I notice a rattling nosie coming from my engine compartment. First thing I did was put the deckplate back in to see if it help and after about 2 tank the noise went away. Just woundering what it might have been. I have a 2004 ext cab with a 3.4 no other mods.

 

[Boheefus]

didja check to see if you have a screw loose?, but seriously, did you reset the ECU by disconnecting the battery for 5 minutes? The MAF will recalibrate and give you a denser fuel charge because it is detecting a higher rate of flow. On a side note, I installed my muffler 2 days after I removed my mud flaps. I noticed a rattling noise too and it took me 2 weeks to figure out that it was the mudflap screw banging around every now and then...good luck!

 

[4x4crazy12345]

Thanks for the reply. I did disconnect the batter both time for quite some time but I sure it probably is something as simple as a loose bolt somewhere.

 

[Boheefus]

No Problem, Merry Christmas