I put in a new map sensor and hit the dyno again today to see if it helped cure my car's crazy AF ratios. It didn't.

I had to abort my first baseline run because at 6,000rpm my AF ratio was spiking to 18:1 . I added a good bit of fuel with the FPR to get it actually on the chart. When it was all said and done I had tamed down the massive spike a good bit, but I had to add a ton of fuel, about 65psi with the vacuum hose off!! I'm sure my injectors won't last long with that much pressure correct?

All of my cars fuel problems happened after I reinstalled my head, the only changes were new OEM valves and Portflow valve springs. I have Skunk II stage one cams, I/H/E, VAFC and a B&M FPR. Before with just a VAFC to tune the fuel I still had a spike at 4,500 and 6,000rpm but it was not nearly as huge.

What would cause my car to run super lean at 6,000rpm then dive down super rich afterwards? Vtec is set at 5,000rpm.

The car also tries to idle low, and after a few full throttle runs it would die when letting off the throttle. It did none of this before. Car makes good compression across the board (about 230 on all 4).

 

So nobody has had there car run lean before with mild cams?

 

i dont like b&m, not very relevant to your post...but try a better fpr?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DeL SLo &raquo;</TD></TR><TR><TD CLASS="quote">i dont like b&m, not very relevant to your post...but try a better fpr?</TD></TR></TABLE>

I've been wondering that as well. Before B&M = pretty good. After B&M = lean as a loopty doopty.