[RESOLVED] What is this Part? (Mystery knob on firewall) [Merged 1-8] fuel pressure

[ETK-kAos]

Hey! Well, my Talon has had the CEL on for a few months now, I'll disconnect the battery and it will go away, then a few minutes later it will come back on. So, I went to Checker today and used their little OBD II machine to get the code out. Here are the results.

Trouble Codes:

P1105 Manufacturer Specific Powertrain Trouble Code

Pending Codes: No Codes Reported

Freeze Codes:

P1105 Manufacturer Specific Powertrain Trouble Code

(I used the search button *go me!* and found that code is for the Fuel Pressure Solenoid)

I was looking for it and I found a part of my car that was not attached anywhere although it had a mounting bracket. I managed to get it attached but was wondering what it is, and what the twisty knob was for and what it should be set at. Anyone know what it is?

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If you cant tell where in the engine bay the picture is, here is a zoom out of the general area.

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Does anyone know what it is for? Also, can someone point out where at the Fuel Pressure Solenoid is? Also here are just a few other questions.

What is this wire for? Does the fact that it is there mean anything?

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Also, why is my fan melting? Does that mean that my car is running, or did run at one time, hotter than it is supposed to?

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Hope to get some answers,
Thank you all,
Anthony

 

[spoolup]

FPR solenoid, and its a cap not a knob. look at the other solenoids on the firewall, (to the passanger side of the car as this one). They have 3 ports, the source, the NO (normally open) and the NC (normally closed). They just capped off the one that is not used. most people bypass it anyways, look here:

http://www.taboospeedshop.com/emissions1.htm

 

[Defiant]

Good GOD don't turn that!!!

 

[96gstdsm]

I am not sure what this thing is in my engine bay and i have not been able to take a picture yet, so i will describe it and hope that helps.
It has a vacuum hose line going from it to the intake manifold and to the fuel rail. In my engine bay it is close to the driver side firewall. It is black and has a little knob you can turn as well. It also has some wires running away from it to i don't know where. It is bolted onto the firewall as well. Anyone know what that is?
The reason i am asking because if it is the fpr would that possibly lead to bogging if it had be turned or played with or anything? I have wait i think is some sort of bogging but trying to figure out what it could be from, and that popped up in my head because i remember someone playing around with it i think.
I have bogging i think, under full throttle at around 3k rpm's in all gears but 1st it seems like. I also have smelt some fuel at times i think.

If anyone knows please let me know. Thanks. ----Ryan.

 

[Ceddy]

Fuel Pressure Solenoid

http://members.shaw.ca/dsm.1000q/Engineprimer/2G/solenoids.htm

You can bypass it.

 

[96gstdsm]

Fuel Pressure Solenoid

http://members.shaw.ca/dsm.1000q/Engineprimer/2G/solenoids.htm

You can bypass it.

Ok thanks, what is the knob there for? If it is turned does that cause anything to happen? Would that adjust the fuel pressure or anything? If i bypass it would that make a change in idle or anything like that?

 

[awdtalontsi1992]

Sounds like it could be the FPR solenoid for the ECU to help with cold startup. However I'm not aware that they have a knob for adjustablity. It definately sounds like it could be a AFPR but exactly what the wires would be I don't know. Pictures would be very helpful. See what you can do and kill the person who screwed with it.

 

[96gstdsm]

http://www.msnusers.com/eclipsepics/shoebox.msnw?action=ShowPhoto&PhotoID=3

Ok here are some pics of what i am talking about.

 

[96gstdsm]

OK i can see that it is stock cause it has the mitsubishi logo on that black knob. The knob does spin around but i don't know if it does anything or could make my car bogg.

 

[RWKustoms]

Did you read the link someone gave you above? It has all the info there.

 

[96gstdsm]

Did you read the link someone gave you above? It has all the info there.

Yes i did, but i want to know if turning the knob on there can effect anything? It turns so i'm assuming you can adjust something with it. I remember someone messing around with it a while back and now i have some sort of fuel or bogging problem and trying to think of everything it could be.

 

[Skunked tsi]

No all that knob is, is a plug nothing else. If you wanted you could take it off and use it a vacuum source.
Tyler

 

[96gstdsm]

No all that knob is, is a plug nothing else. If you wanted you could take it off and use it a vacuum source.
Tyler

Thanks. Knocks that possibility out of it. Now the search continues as to what is wrong with my car...

 

[Skunked tsi]

What is your car doing I realize its bogging but I need more info.
Tyler

 

[denniegst]

one time i pulled that knob thingy off and hooked up my boost gauge up to it. i dont know if it was accurate because my boost gauge was inaccurate

 

[96gstdsm]

What is your car doing I realize its bogging but I need more info.
Tyler

It seems to bogg once i get to basically full boost i guess, a little over 3k rpm's in any gear except first i think. I thought it was my clutch slipping(cause it feels like a slip of some sort) but the rpm's stay the same and i don't smell any clutch burning. It really feels like a quick jerk like once or twice in one gear during full throttle. Some days it doesn't seem to happen either. I recently(800 miles ago) had a new Act 2100 and ACT flywheel put in professionally. With the rpm's not raising at all when i feel it, i would think that would get rid of a slipping clutch as a possibility right? If thats the case then it must either be something fuel or spark related or some sort of a leak. Would a turbo going out ever have sudden quick loss of power? I have new spark plug wires as well. Also new plugs but not installed yet. IF they were bad would they cause my car to bogg only at certain rpm's or when under wot?

 

[awdtalontsi1992]

Sounds like a misfire to me. Give those plugs and wires a good look over. If you suspect a problem with the wires you can use a old trick. Run the engine at night with the hood up. Spray a mist of water on the wires. If there are any sparks, they will light up and show you the break in the wire.

 

[FORMONTOYA]

Sounds like it could be the FPR solenoid for the ECU to help with cold startup. However I'm not aware that they have a knob for adjustablity. It definately sounds like it could be a AFPR but exactly what the wires would be I don't know. Pictures would be very helpful. See what you can do and kill the person who screwed with it.

Not entirely correct.

No all that knob is, is a plug nothing else. If you wanted you could take it off and use it a vacuum source.
Tyler

No.




It is the fuel pressure solenoid, however it's for HOT starts to help combat vapor lock. The "knob" you're referring to is really a filter type of thing (although you don't ever replace it).

What happens when the car "sees" a certain high temperature (don't know what that temp is) it opens the FPR to atmosphere (through the "knob"/filter, similar to removing the source line from the FPR) in order to raise the fuel pressure to the base setting, combating any potential vapor lock condition in order for the car to fire up easier.

You can not remove the knob and use it as a vacuum source as it is not open all the time and your readings from it would not be accurate (as someone else stated).

Spinning it around or removing it does nothing for or against the operation of your car.

 

[96gstdsm]

If it is a misfire wouldn't it make a "pop" sound? Thought i had heard that about misfires. Another thing, what would be the outcome if the spark plug wires were not connected in the correct order? I believe they are, just thinking of everything that it could be. If the firing sequence where to be off, it would be a lot worse than just a bog once in a while correct? I checked the wires last night with a spray bottle and did not hear or see anything unusual.
How should the spark plug wires be connected in order?

 

[tsi009]

Hi guys, I was playing around with a black knob part on the driver side where a couple of vacuums lines hook in to under the hood. Now my car wont idle right and dying if i step off the throttle. What is that part and what funct it has for the car?

 

[diablos991]

Virtual Tour of the DSM Engine Bay - Quadrant map

This site can be helpful for identifying some of those solenoids.
I think the one you are referring to is the fuel pressure solenoid.

"This solenoid allows the engine control computer to temporarily raise the fuel pressure for hot starting purposes. This is accomplished by cutting off the vacuum hose going to the fuel pressure regulator. It is not used for anything else, but it can provide a useful tap-in point for a boost gauge, since the regulator "sees" the intake manifold pressure. (If you tapped your boost gauge in here, but it doesn't read any vacuum right after warm or hot starts, you probably connected to the wrong side of the solenoid.)"

 

[turbosax2]

The "knob" you referred to isn't really a knob - it's just a cap. Messing with it won't change anything.

For your problem: Do a boost leak test.

 

[green_GST]

I found this picture on google images, so ignore the purple arrow. But I need to know what the two little things are with electrical plugs and vaccuum hose nipples (top center). The inner one is hooked up on mine, but the outer one is just there. More so than knowing what it is, how important is it?

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[r1991_4g63t]

that would be your fuel pressure regulator solenoid, only used during starting to cut the vacuum to the regulator and since im betting it dont get as cold as it gets here you should be fine

 

[green_GST]

that would be your fuel pressure regulator solenoid, only used during starting to cut the vacuum to the regulator and since im betting it dont get as cold as it gets here you should be fine

Thanks man.
I guess it's not necessary considering I have an AFPR...

 

[r1991_4g63t]

its not necessary at all unless it gets REALLY cold. Mine isnt hooked up and it started fine on the -20 degree mornings last winter. so im thinking unless you live on the north pole you should be good without it