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 Old 07-09-2016, 04:58 PM   #1
 
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Default fuel pressure dropping to 200psi

my car threw a P064D code. i took a 3rd gear log (WOT from 3500-4500RPM) and fuel pressure is dropping really low (~200psi) and AFR is pegged at 14.85. i've had CS internals for ~20-30k miles now and never cleaned them. i occasionally run an e30 blend but have mostly been running 93 lately. any help would be much appreciated

edit: the P064D code usually goes away after a day or so if i dont go WOT, but immediately returns once i go WOT
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2013 Black Mica MS3 w/ Tech

Cobb AP V3 - JR TUNED - E85 - ST coilovers - CS hpfp internals - CS sri - CS tip - CS rsb - CS short shifter - CS shifter bushings - UR axle-back - ATP catless dowpipe - CP-E rmm - Denso ITV22

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 Old 07-09-2016, 08:35 PM   #2
 
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With the AFR not changing, sounds like a bad O2 sensor.

As far as the fuel pressure, you could try cleaning the spill valve and see if that helps. To me it doesn't look real. You are getting over 2 load with no KR. I would think if the pressure was that low, you would knock

Have you don't anything to the car recently? Forgot to plug something back in? Forgot to reattach that ground by the HPFP?
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 Old 07-11-2016, 04:03 PM   #3
 
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Originally Posted by sheston View Post
With the AFR not changing, sounds like a bad O2 sensor.

As far as the fuel pressure, you could try cleaning the spill valve and see if that helps. To me it doesn't look real. You are getting over 2 load with no KR. I would think if the pressure was that low, you would knock

Have you don't anything to the car recently? Forgot to plug something back in? Forgot to reattach that ground by the HPFP?
haven't done anything recently. the last thing i did was a catless downpipe and dyno tune last summer.

here's a log of when the check engine light turned on. no CEL before the pull and it turned on halfway through the log which is what makes me doubt that its an o2 sensor problem, because it was working fine until i went WOT
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 Old 07-11-2016, 06:24 PM   #4
 
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That log looked better, until you get about half way thru it. AFRs go to straight line. The P064D code does look like it might be related to O2 sensor, but....

Did a quick search and saw where someone changed their spark plugs when they were having this issue and it cleared up. Might be worth a try. Otherwise, check your wiring harness, most likely around the ECU, and look for rubbing or shorted wires.
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 Old 07-13-2016, 09:53 AM   #5
 
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Originally Posted by sheston View Post
That log looked better, until you get about half way thru it. AFRs go to straight line. The P064D code does look like it might be related to O2 sensor, but....

Did a quick search and saw where someone changed their spark plugs when they were having this issue and it cleared up. Might be worth a try. Otherwise, check your wiring harness, most likely around the ECU, and look for rubbing or shorted wires.
i'll be doing the spark plugs today. we'll see what happens
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rice : Rally Armor mud flaps - Deep Red powder coated pu wheels - 20% tint
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 Old 07-13-2016, 03:46 PM   #6
 
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spark plugs fixed it !
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Cobb AP V3 - JR TUNED - E85 - ST coilovers - CS hpfp internals - CS sri - CS tip - CS rsb - CS short shifter - CS shifter bushings - UR axle-back - ATP catless dowpipe - CP-E rmm - Denso ITV22

rice : Rally Armor mud flaps - Deep Red powder coated pu wheels - 20% tint
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