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Old 08-30-2014, 01:04 AM   #1
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Datalog results.

Hi, I'm new in this forum. I have a 2001 v6 mustang with a windstar manifold, x-midpipe, flowmaster exhaust, and a bama tune. I datalogged my car a few days ago using my SCT X3 and LiveLink. I noticed that the fuel pump is working above 80% duty cycle at idle and between 95-100% at WOT. Moreover, the fuel pressure in the fuel rails and injectors was 65 psi and the pressure dropped to 58 psi at WOT. The average of both short term fuel trims was 1.00 and between 0.79-0.85 at WOT. The long term fuel trims were also very close to 1.00. I believe this indicates that there is not a constant rich or lean condition. I've been reading about this and I found that the recommended fuel pump duty cycle at WOT should not be greater than 80 or 85%. I also found that the fuel pressure should always be close to 40 psi. Any ideas of what could be causing this? maybe a bad fuel pump or fuel pump drive module?
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Old 08-30-2014, 09:58 AM   #2
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Yeah it's either gonna be a bad fuel pump or fuel filter. Maybe try resetting the fuel pump if that helps. I would start with the filter though it's cheaper and easier to do.


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Old 08-30-2014, 11:31 AM   #3
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I'm gonna change the fuel filter, thanks.
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Old 09-02-2014, 01:27 AM   #4
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The new fuel filter didn't make any difference. I'm not surprised I change the fuel filter regularly. I don't know how to reset the fuel pump, so I reset the computer but nothing changed. I'm gonna replace the FPDM, It's cheaper and easier to replace than the fuel pump.
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Old 09-02-2014, 07:03 AM   #5
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How long have you had the Windstar intake on this car? Did you swap to the Windstar fuel rail? And is the fuel pressure regulator connected to vacuum? If that's not that could be giving you your funky readings and high fuel pressure and with the vacuum leak causing your fuel Trim number to jump that high. Go over your engine and check all hoses and wires.


1967 coupe 351w 5 speed dual exhaust long tube headers, 2000 v6 5 speed dual exhaust lowering springs drilled and slotted rotors, 2005 ford ranger single cab 3.0 under drive pulleys auto 8.8 rear end with 4.10 gears
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Old 09-03-2014, 12:17 AM   #6
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Take the bama tune off and datalog again


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BV heads, P&P lower, comp 218/226 cam, 4.2 bottom end, 3k stall, flow 40's, O/R x-pipe, Pacesetter lt's, SCT xcal2 (93 Ortizperformance tune), Windstar upper, 65mm tb, CAI, 8.8 w/ 3.73's, SFC's, cut springs, KYB shocks/struts, MM LCA's
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Old 09-03-2014, 09:19 PM   #7
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All wires and hoses look fine. The hoses were replaced when I swapped the windstar intake like 2 years ago. I didn't swap the fuel rail. I replaced the fuel rail pressure sensor a few months ago, and yes is connected to vacuum. You said that the fuel trims are high, so what's the ideal number?

I have datalogged my car with both the stock and the bama tune and there is no difference in the data.
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Old 09-03-2014, 10:11 PM   #8
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1.0 represents a 14.7 AF which is the ideal


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BV heads, P&P lower, comp 218/226 cam, 4.2 bottom end, 3k stall, flow 40's, O/R x-pipe, Pacesetter lt's, SCT xcal2 (93 Ortizperformance tune), Windstar upper, 65mm tb, CAI, 8.8 w/ 3.73's, SFC's, cut springs, KYB shocks/struts, MM LCA's
blower/new cam soon
Dealer for Ortiz Performance, great tunes at a good price!
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Old 09-03-2014, 11:33 PM   #9
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Thanks.
Something I didn't mention that may be relevant is that when the engine is cold the values of the fuel pump duty cycle and the fuel pressure seem to be normal. For instance the fuel pressure is between 38 and 40 psi and the fuel pump duty cycle is around 50% at idle. This values stay like that for about 6 minutes and then they start to raise very fast. For example, the fuel pressure goes from 40 to 45, then 55, and finally 65 psi. It takes 30 seconds to go from 40 to 65 psi. Something similar happens with the fuel pump duty cycle.

Something else that I forgot to mention is that since I bought this car like 3 year ago I have replaced the maf sensor, spark plugs, IAC, coil and wires (both MSD), throttle position sensor, fuel rail pressure sensor, and both front O2 sensors. I didn't do this because they were bad, I did it just because I wanted brand new parts.
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