So I think I broke my truck......

[KaiserM715]

The truck has always smelled rich, I have always thought it was because of the high-flow cats....<snip>

I have never noticed a rich smell with my G8 w/ high flow cats.

 

[The Tank]

I have never noticed a rich smell with my G8 w/ high flow cats.

Hmmm come to thing of it my lightning didn't smell either but its cats were normal size the ones from Stainless Works are about the size of an iPod. I don't know if that has any bearing on smell but you would think my truck didn't have cats.

 

[The Tank]

Update 1 spark plugs are on order will be in this afternoon/tomorrow morning. I'm using the Motorcraft SP 509. Also called Troyer Performance about a full retune and truck is on the books for Nov 11. Truck will be tuned on 93 octane.

 

[The Tank]

Update number 2 the plugs fixed the problem now just waiting on next week. Every spark plug was covered in fuel and plug 1 had a bent electrode.

 

[SuperRaptor]

What caused that? Surely a WOT 80-100 shouldn't have done that?

 

[GasGasMan]

Bent electrode means something hit the plug.
Putting a thinner head gasket will affect cam timing. So, proceed wisely.

 

[The Tank]

What caused that? Surely a WOT 80-100 shouldn't have done that?

I think it was the tune from JDM being to rich.

 

[Xjrguy]

Update number 2 the plugs fixed the problem now just waiting on next week. Every spark plug was covered in fuel and plug 1 had a bent electrode.

What caused that? Surely a WOT 80-100 shouldn't have done that?

I think it was the tune from JDM being to rich.

How does a tune bend an electrode on a spark plug?

 

[BigJ]

How does a tune bend an electrode on a spark plug?

Detonation. If it's detonating, he probably broke a piston (ring land?). The bit of piston flies around, nails the plug and there ya have it. Not good.

Bad O2 sensors can also screw with the AF mixture. Your tuner didn't turn them off after the engine mods, did he?

 

[The Tank]

How does a tune bend an electrode on a spark plug?

Detonation. If it's detonating, he probably broke a piston (ring land?). The bit of piston flies around, nails the plug and there ya have it. Not good.

Bad O2 sensors can also screw with the AF mixture. Your tuner didn't turn them off after the engine mods, did he?

Big J is correct on the detonation but it was only at WOT. I have to run 93 in my truck that is tuned for 87. I can't say for certain and I'm not going to bash JDM because I knew the risk of doing a mail order tune but one of the problems I had was a CEL for rear O2s and now the CEL is gone. AFR at WOT is in the 12s I just can't remember off the top of my head where in the 12s it was but I want to say it was 12.0. These hypercraptic pistons that Ford uses are fairly strong piece so I don't think I've made ugly babies in the cylinder.