Question

I have an MSD 6 ignition with an MSD coil in my truck. Fresh 5.2 with less than 1000 miles on it now, long tube headers, mild cam, nothing too crazy.

• Engine runs good and sounds good, but it does smell like its running rich. I can smell gas at idle.
• The truck feels really lazy like its way underpowered.
• I have a Snap On scan tool and have the fuel sync set to +3 which seems to make it run the best with my setup.

Question - MSD 8680 timing control lets you adjust timing manually. Has anyone tried one in their truck? I'm curious how well it would work.

 

If you think its running rich, changing the timing won't fix that.

How old are your O2 sensors?

 

o2 sensors are about 2 yrs old. NGK part# 23139 front and NGK part#23140 rear (my truck came factory with only 2 sensors.) I already swapped them out once and still it smells rich when I drive or if I put it in park and walk around the truck.
I was 'thinking' the timing could possibly be out of whack, just grabbing at straws trying to figure this one out. I have swapped the ECM, also ran a continuity test on all the o2 sensor wires to confirm they aren't broken/shorted.
Only code I am getting is for the coil, but I have an MSD ignition/coil so I'm not surprised by that. (the truck ran rich before and after the MSD upgrade)

 

You can smell fuel correct?

 

Is the pcm getting a correct reading on the temperature?