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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Fuel pump installed, now running rich

  • Thread starter Thread starter vertigasen
  • Start date Start date Jan 23, 2009

vertigasen

Active Member
Apr 28, 2004
366
18
29
Falcon, CO
Jan 23, 2009
#1
  • Jan 23, 2009
  • #1
I'm sure some of you remember the old thread I started (old thread) but that one got out of hand.

Anyway, I got the SVTF pump installed. It was a piece of cake, an hour and a half and it was done (with 1 army since I had surgery a month ago). The install included, fuel pump, fuel filter, air filter, MAF cleaned. Everything is runnning good now, but, after the test drive, I have some questions. While driving, the AFR is pretty good except at WOT. The higher the RPMs the more rich it gets. @ 3k 13.8, @ 4k 12.8-13.2, and > 5k 12.2-12.4. I was pretty much 14.4-14.8 across the board prior to the pump going out. What gives?

I talked to the shop that did my tune, they said I dont need a tune after the pump install, they also said that me going from DC, pretty much sea level, to Colorado Springs, 6+k ft, shouldnt make much of a difference. I was only in Colorado for about a month before the pump went out, and I was never really on it much so I didnt notice the AFR going rich at higher RPMs. (on a side note, after searching google, it has been said that altitude should not change the AFR)

So, what is causing me to now go rich at higher RPMs? The pump? The MAF going south? Bad O2 sensors? Dorked up AFR sensor?

Thx for the help
 

bhuff30

Founding Member
Dec 11, 2001
6,037
35
129
Olathe KS
Jan 23, 2009
#2
  • Jan 23, 2009
  • #2
The AFs you see at WOT look very normal to me. Running 14:1 at WOT a bad thing. It won't make as much power and can be very dangrous to your engine. If you wanted, you could get a custom tune to lean it out a little, but that's plenty safe.
 

fasthippo

New Member
Oct 22, 2008
52
1
0
OC, CA
Jan 23, 2009
#3
  • Jan 23, 2009
  • #3
bhuff30 said:
The AFs you see at WOT look very normal to me. Running 14:1 at WOT a bad thing. It won't make as much power and can be very dangrous to your engine. If you wanted, you could get a custom tune to lean it out a little, but that's plenty safe.
Click to expand...

+1

i'm not very experienced with tuning but 14.4-14.8 sounds way to lean to me.
sounds like ur pretty close to where you should be.
 

BurningRubber

10 Year Member
Dec 6, 2004
1,865
24
58
Jan 23, 2009
#4
  • Jan 23, 2009
  • #4
Holy ****!!! 14.8 AFR?!?! God you are lucky your engine still runs.

Like Bhuff said, your fine now... 12.2-12.4 isn't optimal for a N/A engine, but it IS safe. 13.0 is the "sweet spot" generally on an N/A car.
 

SaleenGT2001

Well-Known Member
Jul 18, 2005
2,811
4
58
Four Oaks NC
Jan 23, 2009
#5
  • Jan 23, 2009
  • #5
looks fine to me also.
i dont like to see over 12:1 on my car
 
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