AF Ratio Gauge question

[Bone]

Has anyone seen a difference between a dyno's AF ratio results and a wideband gauge installed on your truck?

I have installed an AEM Wideband system and I am reading rich at WOT between 3000-6000 RPMs. Normally, I run around 12.5 A/F in the same RPM band, real tight tune. The only difference (mod) has been colder spark plugs since the tuning.

Any ideas or seen this before?

 

[Nowwhat]

Has anyone seen a difference between a dyno's AF ratio results and a wideband gauge installed on your truck?

I have installed an AEM Wideband system and I am reading rich at WOT between 3000-6000 RPMs. Normally, I run around 12.5 A/F in the same RPM band, real tight tune. The only difference (mod) has been colder spark plugs since the tuning.

Any ideas or seen this before?

any changes to your meth mixture....?

 

[Bone]

any changes to your meth mixture....?

Nope, I mix a 50/50 solution.
I doubt the gauge is in error, but was wondering if the colder plugs would do it? Still pulls hard after the plug install.
I guess the only thing I really could do to verify it, is go back to the dyno. But I really installed the gauge to do my own tuning, instead of dropping a few bills for the dyno everytime.

 

[Blakewilder]

did u instal the widebands o2 sensor before or after the cats?

 

[BLACK10]

Bone

I am having the same problem with mine I only see the rich condition under WOT my AEM gauge reads fine even at 1/2 throttle to 3/4 but when I put it all the way to the floor my A/F drops to 10:1 ..I have tried a few things to fix it tried changing the disc in the fmu and it didnt help .... :dontknow:

 

[Blakewilder]

Mine was doing that too before the engine blew up....but my tech had another wideband hooked directly up to the VEC and they were reading the same. I dunno how he fixed it but he did.

 

[BLACK10]

thanks blake makes me feel good to know yours was doing the same the same thing " Right before the motor blew up" now I am gonna have to get this fixed for sure..if you can maybe your tuner can tell you what he did to fix it