320,000 mile NSX Diagnostics Continue! Fuel pressure testing...

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Recently we noted some low/mid RPM hesitation while driving our now 320,000 mile 1992 Acura NSX. Today we continue diagnosing this hesitation by testing fuel pressure with and without the fuel pump resistor!
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0:00 Intro and Why we're still diagnosing vs fixing?
1:16 Test Drive 1: With resistor
2:38 Test Drive 2: Without resistor
3:25 Download & Take-aways
4:52 Unexpected Twist and new suspect
5:33 What now?
6:51 NSX community: still awesome!
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Due to factors beyond the control of Lap of the World/Richard, I cannot guarantee against improper use or unauthorized modifications of this information. Lap of the World/Richard assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. Lap of the World/Richard recommends safe practices when working on or driving vehicles and or with tools seen or implied in this video. Due to factors beyond the control of Lap of the World/Richard, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Lap of the World/Richard.

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22 июл 2024

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Комментарии : 14

@acura2g 14 дней назад

Chasing electrical gremlins on a 30 y/o car is always a treat. It does look like the pressure at idle and at rpm is off from reference but I don't know where you're measuring from. Just from experience, Fuel pump performance dips off faster as age ticks on. It wouldn't surprise me if it's a simple fuel performance issue. I keep a pump on hand for road trips since they're small and cheap. Cant wait for the diy

@dabuzz6611 14 дней назад

Good data, thanks for sharing. I did the fuel pump in my 95 NSX. It is not that hard to do.

@deuceandguns 14 дней назад

Interesting. I don't know much about the NSX but depending on where that gauge is plumbed in I'd also assume it should hold pressure after shutoff. FYI - While It's off brand for your channel you're still welcome to review my Deuce and a Half...If I can get her started.

@LapoftheWorld 14 дней назад

Fair point on the location. It's on top of the fuel filter, which is between the pump and fuel rail/regulator. Unfortunately I didn't have a pressure gauge on there prior to the changes that also introduced the adjustable regulator, but I have some folk in the NSX community testing now, lol. I used to work with a guy who had an M35 of some flavor, always fun to see it on the odd days he'd end up with that in a suburban office parking lot. Are you local (East TN)? If so, I'm sure we could come up with something to do.

@deuceandguns 14 дней назад

@@LapoftheWorld I keep my real name off my channel but I'm the guy you used to work with.

@LapoftheWorld 14 дней назад

@@deuceandguns Lol, I wondered! In my defense, I thought you looked familiar, but it's been like 10 years since I was regularly in the office at this point 😁. Hope all's well, and we should grab a beer sometime and see what we can come up with. Shoot me an email richard@lapoftheworld !

@camerongrady580 13 дней назад

Just as an FYI, its been my personal experience that no aftermarket fuel pressure regulator holds pressure with the key off quite like fhe OEM units do. (much to my frustration) I've had them vary from a few minutes to zero seconds, quite like what your AEM one is doing now. I just wanted to speak up and let you know that this is not a sign that anything is functionally wrong with the regulator.

@Justbrakesauto 13 дней назад

The fuel pressure regulator is supposed to bump pressure once vacuum in the intake becomes low ( full throttle). What’s interesting is that with the resistor connected the pump isn’t making enough pressure for the regulator to do its job until it’s receiving full power that’s why you’re getting the hesitation. Once the resistor is bypassed the regulator works as its intended step on the throttle pressure goes up. I’m not sure if honda intended for the resistor to have that much control over pressure my gut says no as I was under the impression the resistor was for reducing noise only. I wouldn’t use an aem fuel pressure regulator personally as I’ve heard a lot of horror stories about them and there is too many knock offs to trust, if anything I’d mod the oem honda regulator by using a b&m command Flo if you can find one or equivalent from another reputable company they are tried tested and true. Realistically the oem regulator should be more than enough.

@LapoftheWorld 13 дней назад

For context: We're semi-newly running a 3.2L bottom end with 3.0L hardware/software everywhere else. Small displacement gain, hence the aftermarket regulator to bump the pressure. From the NA1 (3.0) to the NA2 (3.2) NSX the only parts that are different from the factory are the injectors. Consulting with SOS and Comptech we opted to use an adjustable regulator to compensate for not having higher flow injectors to keep things happy with the extra fraction of a liter. That said, I've also read/heard of a few of the AEM regulators needing rebuilt more frequently than I'd hope. I'm 100% certain this one's genuine, but it's still on my watch list while we figure this out. Appreciate the recommendation in case that does end up being an issue.

@Justbrakesauto 13 дней назад

@@LapoftheWorld from what I can see in the video the regulator you’re using is working correctly this is proven when the resistor is bypassed. I believe you may be dealing with a fuel supply issue in my opinion. Either fuel pump, plugged filter or plugged strainer.

@joeshih5974 13 дней назад

Hi. One of your video you’ve mentioned about your NSX having random speed. What was the issue?

@LapoftheWorld 13 дней назад

@@joeshih5974 Was this a recent video? If so, that was Liz's NSX. She hasn't done the work yet, but I had the same thing happen to the black car in 2008. It was the speedometer sending unit on the top of the transmission. Not a hard fix.

@joeshih5974 13 дней назад

@@LapoftheWorld what is that part called?

@LapoftheWorld 13 дней назад

@@joeshih5974 I'm pretty sure it's part no. 78420-SL0-505. Please double check as that may vary by year though. Diagram says that one's applicable to 91/92. YMMV for later years.