What's this screw for?
#1
What's this screw for?
Found this resting in the buttcrack of the Starter and Starter Solenoid. Anyone have any idea what it's for? It's very small; pic was taken on my seat with my phone very close to it. A little short of half an inch.
#2
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Re: What's this screw for?
That goes on the end of the fuel rail where the line from the fuel filter is. There's a small diaphragm in that end piece and that screws in under the plastic cap.
-Amp
-Amp
#3
Re: What's this screw for?
I'd have to disagree with you because the fuel rail/line bolt should have a hexagonal bolt head... well, at least mine does
#5
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Re: What's this screw for?
Under that plastic cap. Note: Not my car pictured.
-Amp
Last edited by SIR-G Amp; 01-21-2017 at 01:56 PM.
#6
The Credible Hulk
iTrader: (22)
Re: What's this screw for?
Damn if it doesn't look like he's right.
https://honda-tech.com/forums/acura-...0-gsr-2825228/
Still a good idea to post year/model/trim level on future tech related posts.
https://honda-tech.com/forums/acura-...0-gsr-2825228/
Still a good idea to post year/model/trim level on future tech related posts.
#7
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Re: What's this screw for?
Damn if it doesn't look like he's right.
https://honda-tech.com/forums/acura-...0-gsr-2825228/
Still a good idea to post year/model/trim level on future tech related posts.
https://honda-tech.com/forums/acura-...0-gsr-2825228/
Still a good idea to post year/model/trim level on future tech related posts.
And yes, starting with as much information as possible will drastically help your chances of finding a problem here. I just happen to have done this recently.
A spare one I have. ha
-Amp
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#9
Re: What's this screw for?
They don't look the same to me. On has outside threads, the one on the fuel rail looks like it may be female threaded:
Granted the second picture could be less clear... Hard to say.
Granted the second picture could be less clear... Hard to say.
#10
I like the tuna here
Re: What's this screw for?
I think they are the same. Also, the one that fell out could have fallen out BECAUSE the threads are messed up, which is what it looks like to me.
#14
#1 Super Guy
iTrader: (2)
Re: What's this screw for?
There is no detail in the service manual on this piece.
If I were to guess, i would say screw threads into the diaphragm inside the pulse damper. The o-ring seals the air chamber inside the device from the outside air. Perhaps this allows variable damping characteristics.....when the damper moves only slightly, the chamber remains sealed building air pressure (making the damper stiff), but if the damper moves outward a lot, the o-ring looses it's seal and the pressure build-up is vented (theoretically making the damper softer).
I'm just guessing though.
If I were to guess, i would say screw threads into the diaphragm inside the pulse damper. The o-ring seals the air chamber inside the device from the outside air. Perhaps this allows variable damping characteristics.....when the damper moves only slightly, the chamber remains sealed building air pressure (making the damper stiff), but if the damper moves outward a lot, the o-ring looses it's seal and the pressure build-up is vented (theoretically making the damper softer).
I'm just guessing though.
#17
Re: What's this screw for?
Will this screw make a noticeable difference in the overall running of the car? My 95 dx hatch randomly started running like it was on 3 cyls, i popped the cap because i was gonna check the fuel (35 miles after filling up from 1/4 tank) and verify there was pressure. When i popped the cap something fell, after robbing my parts car i realised it was this screw. Reinstalled and started car, still running shitty, i started wiggling injectors/connections and it started running right again Within 2-3 minutes of starting the car. Was it the screw or one of the injectors? Car has about 330k, it was rainy/snowy, i pulled over to make a phone call and when i went to drive away it was like someone unhooked a plugwire while idleing...this screw is only thing i noticed "out of place"... Also i posted similar question but no replies yet on that thread which is why im here
#18
Re: What's this screw for?
Part taken from 94 ex coupe....
I feel i read somewhere that the dx doesnt have one?
#19
Re: What's this screw for?
All USDM/CDM 92-95's have that setup on the end of the fuel rail.
The 96-00 did a different fuel rail setup.
The 96-00 did a different fuel rail setup.
#20
Re: What's this screw for?
Ok, does the screw dramatically affect performance? Car seems to be ok, but not confident thats what the issue was
#21
Re: What's this screw for?
I would suspect it could affect how the car runs. Honda put a plastic cap over the top to help hold it in place as well as make sure it wasn't lost should it back out.
slomofo did indicate it helps keep a spring aligned. Without the screw vibration could impact said spring. I'm not exactly sure how the system operates but I don't see Honda putting a screw there if it wasn't needed.
slomofo did indicate it helps keep a spring aligned. Without the screw vibration could impact said spring. I'm not exactly sure how the system operates but I don't see Honda putting a screw there if it wasn't needed.
#22
Re: What's this screw for?
Still a vague answer...not to any fault of anyone on here, im guessing thats one of those parts you just throw money at it instead of questioning it, but i like to learn as i go. At this point im sort of looking for some reassurance, so im thinking about just pulling the screw to see if i can recreate the issue then cure it again... Good idea, Bad idea?
And all help is very appreciated
And all help is very appreciated
#23
Honda-Tech Member
Re: What's this screw for?
this is what frustrates me about Honda sometimes, My 92 Si and my 92 Dx (both hatch) did NOT have this pulse damper and both were completely stock when purchased.
#24
Re: What's this screw for?
Now that you say you've seen it without, I will pay closer attention.
It could also be an area thing. I'm in Canada and maybe it had to be there for CDM but could be without in USDM?
I'm looking at my first VX tomorrow so will see if it has it.
The SI engine I have has it but I'm not 100% sure it's all original. This could be where I've been misled in my belief it's on all 92-95's.
I know it's not on the 96-00 D16Y8. I have that fuel rail to play with so I am pretty sure it won't be on the D16Y7.
#25
Honda-Tech Member
Re: What's this screw for?
ALL USDM '92-95 Civic's have a pulse dampener on the inlet end of the fuel rail. Now in fairness to those who have a car and BELIEVE that it is otherwise stock... the possibility exists that the fuel rail has been removed/serviced in it's life and the half-assed mechanic/owner did a poor job of replacing the original parts. In many cases, the plastic covers are not re-installed and vibration effectively dislodges the dampener screw and it APPEARS that it was never there. When the car left the factory... it was there. Twenty-four to twenty-seven years later... this may not be the case.