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Discussion Starter · #1 · (Edited)
Backround: electric f.p. gauge shows 46-47lbs of f.p. at idle (no vac). when plugs were changed a little under a month ago (took out 104s, put in new 104s), they were all white, and ranged in gap from .42 to .58. (they all went in at .55).


Well, I recently changed my fuel filter, and that was not the culprit of my lower f.p. problem. Now, the search goes on to find out why I'm running lean. I did some autotap runs and was picking up about anywhere from 3-4.5* of KR throughout the rpm range. o2's ranged from .910-.940 through most of the WOT runs. Never really dipped below .910.

On one run at 5200rpm (2nd gear) I saw:
9.5* of timing
18.51 mS - IPW #1
4.7* of KR
33.064 lb/min - MAF rate
10243.7 hz - MAFF
10.9:1 - A/F
3.9v - TPS
2.3% LTFTs
.915 mV - 02s
81* IAT

Different run - 5697rpm (1st gear) -
10* Ign. timing
17.81 mS - IPW #1
2.7* of KR
2.3% LTFTs
33.547 MAF rate
10395.9 Hz - MAFF
910mV - o2s
84* IAT
4v - TPS

Now, ambient temps were about 63* outside, low humidity. I have the a idle log, cruise log, and the 3 wOT logs if anyone wants to view them. Any help would be greatly appreciated.

Car has 56k on the clock. Mods are: 180* drilled thermo, 3.4", open intake, ubend/reson, 104s, new oem plug wires at 42k miles. I'll provide any other info at your request. Thanks guys!
 

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Have you tried a different fuel preasure gauge? Just to make sure the one you have is reading correctly?
 

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I don't understand. .910-.940 is very acceptable. At your mod level, 4 degrees of KR or less is also acceptable.

Stock FP at idle with the regulator unplugged from vacuum should be 52psi.
 
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