Repairing the SCV Suction control valve

Petrol, gas, fuel tanks etc

Re: Repairing the SCV Suction control valve

Postby Greytriton on Tue Oct 14, 2014 3:12 pm

Sounds like some good results.
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Re: Repairing the SCV Suction control valve

Postby coughy on Sat Oct 18, 2014 6:35 pm

Greytriton wrote:I've run one with a shortened spring by a few coils to reduce solenoid coil force required. Idol speed requires most current so a reduced current required to maintain control. Seems to work ok and didn't have any different feel at throttle application. A heavier spring would work adversly and would make the solenoid 'work harder' so that's why I tried a reduced spring. I'm talking like 3 or 4 coils.


So has anyone got a new one of these valve to see what the spring tension is like as i pulled mine out and had a look at it and the spring tension seemed weak and like it needed more tension on it..??
Because mine is idling at 4500 jumping around 300 to 400 psi up and down going by the scangauge and only ever reaches 22000 psi at full load??

It is still the genuine scv from mitsubishi i haven't done any thing to it YET..
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Re: Repairing the SCV Suction control valve

Postby Greytriton on Sat Oct 18, 2014 8:26 pm

Just polish the spool and put it back in. That's all it needs. Don't touch the spring.
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Re: Repairing the SCV Suction control valve

Postby RHKTriton on Sun Nov 09, 2014 5:40 pm

Did the SCV polish and definitely seems smoother now. Having the battery out brought up a couple of errors but hopefully they clear soon.

I checked the rail pressure with Torque and found the pressure reads up to 100Mpa when revving, seems high.

What's the normal expected range?

Back to the valve - you could see scuff marks on the plunger and also in the valve barrel, before the work and feel resistance when moving the plunger in and out.

Post polish, everything is slick.
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Re: Repairing the SCV Suction control valve

Postby Belbrook on Mon Nov 10, 2014 2:20 pm

RHKTriton wrote:Did the SCV polish and definitely seems smoother now. Having the battery out brought up a couple of errors but hopefully they clear soon.

I checked the rail pressure with Torque and found the pressure reads up to 100Mpa when revving, seems high.

What's the normal expected range?

Back to the valve - you could see scuff marks on the plunger and also in the valve barrel, before the work and feel resistance when moving the plunger in and out.

Post polish, everything is slick.


I get a P1901 which is an A/T fault code every time I disconnect the battery. I think it's common. It goes away after a while but probably gets logged in ecu.
Not bad for an old bloke
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Re: Repairing the SCV Suction control valve

Postby biggibbo on Mon Nov 10, 2014 2:28 pm

Does the spindle just pop straight out once the circlip is removed? Buggered if I can get mine to come out
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Re: Repairing the SCV Suction control valve

Postby Cowboy Dave on Mon Nov 10, 2014 2:35 pm

P1901 is a canbus voltage anomaly. Unplug all obd devices before disconnecting the battery to avoid this.
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Re: Repairing the SCV Suction control valve

Postby Belbrook on Mon Nov 10, 2014 4:05 pm

^^^^^^ thanks CD. I will do that next time.
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Re: Repairing the SCV Suction control valve

Postby Cowboy Dave on Mon Nov 10, 2014 4:11 pm

If you have an ultragauge as I do, you may find it still produces the code the next time you plug it in. It seems to 'boot' for a lot longer than normal after having no power and I figure it takes more voltage out than the canbus is expecting. I find I have to press one of the buttons on the back of it to make it snap out of the boot loop and return to normal operation. It then takes numerous engine restarts before the code will fully disappear, regardless it seems of how many times I try to manually clear it. Mine is possibly exacerbated by having 2 devices off the OBD port on a Y splitter.
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Re: Repairing the SCV Suction control valve

Postby RHKTriton on Mon Nov 10, 2014 6:24 pm

I just tapped mine on the desk to get the plunger out biggibbo.

You might be able to hook it with a paper clip or something similar.

Went for my first drive today since the op and found smoother running and a huge improvement in economy compared to last six months or so.

I've been struggling to get below 13 on the display lately - got down to 10s in similar driving now - that's with the 265 75s!
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Re: Repairing the SCV Suction control valve

Postby t.woods on Mon Nov 10, 2014 8:21 pm

okay so i tried to find the scv as per steve1000 comment, i think i have found it, but can somebody please post a photo circling where it will be as i am not very car savvy so saying things that it is near or go into etc will nt be of much help, i am keen to try and fix this my self but just need some guidance, and also, i dont have a drill press so can i just manually polish it by holding it? and just do it for a bit longer? cheers!
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Re: Repairing the SCV Suction control valve

Postby Cowboy Dave on Mon Nov 10, 2014 8:43 pm

If you stand on the passenger side and line your body up with the battery, then lean over the top of it, it is down beneath the level of the bottom of the battery on that side of the engine.

Here's a picture of mine on the MN but the ML will look basically the same, maybe a different colour plastic depending which fuel pump you have:

Click to view larger picture

Click the image for the full width of the picture.
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Re: Repairing the SCV Suction control valve

Postby t.woods on Mon Nov 10, 2014 8:55 pm

thanks alot! i didnt have the right spot haha, i do now but :) and as for polishing it by holding it instead of a drill press will that still be good as long as i get rid of any wear marks?
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Re: Repairing the SCV Suction control valve

Postby RHKTriton on Mon Nov 10, 2014 8:58 pm

I'd give the area a good clean if its dirty as in the pic to reduce chance of contamination when you remove and reinstall the valve.

You don't need a drill press, however a cordless or equiv. to spin the plunger will give a more even result.

I used a bit of flat extrusion to wrap the paper over to keep the polishing even over the length of the unit.

Biggest hastle I had was the bigger O ring dropping off its groove on the pump housing.

Have a good look at the plunger before you polish and you'll see uneven scuff marks and small scrapes.

Only needs a few short bursts polishing and you'll see the improvement in the surface' even without a magnifying glass.
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Re: Repairing the SCV Suction control valve

Postby t.woods on Mon Nov 10, 2014 9:05 pm

thanks mate i will give this ago this weekend! appreciate the advice and info every1!
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Re: Repairing the SCV Suction control valve

Postby Cowboy Dave on Mon Nov 10, 2014 9:22 pm

he called my engine dirty :shock: :cry: :cry: :oops:
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Re: Repairing the SCV Suction control valve

Postby ag9111 on Tue Nov 11, 2014 9:39 am

Cowboy Dave wrote:he called my engine dirty :shock: :cry: :cry: :oops:


:lol: :lol: :lol:

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Re: Repairing the SCV Suction control valve

Postby Cowboy Dave on Tue Nov 11, 2014 9:46 am

It wasn't that long ago that I last washed it either. :cry:

Mind you I'm still scarred from Ken calling it the cleanest MN in the country. :oops:

Doesn't look much that way now after some dirt roadwork out the back of Narrabri 5 minutes after they'd run the water cart through it. :lol:
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Re: Repairing the SCV Suction control valve

Postby coughy on Mon Nov 17, 2014 12:24 pm

hi can anyone with a brand new not used scv that is the smaller version like the op measure the resistance of the coil for me pls???
also i noticed that there is 2 holes on the side of the valve that arnt perfectly round so to speak are they shaped that way for a reason?? would making them the same size as the rest of the hole do anything?
like let more fuel in or something????
or would it make a great big problem??
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Re: Repairing the SCV Suction control valve

Postby bowny on Wed Jan 28, 2015 11:16 am

hey im looking a removing my suction control valve today as it looks like it shit it self what is the easiest way to remove and do i need an special tools, Its a 3.2 2008 trition. I have found the SCV but it looks like a bitch to get out.
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Re: Repairing the SCV Suction control valve

Postby mattz on Wed Jan 28, 2015 11:47 am

Just awkward to get at.
From memory......I removed the battery but it was still hard.
You just need the correct sized Allen key
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Re: Repairing the SCV Suction control valve

Postby Cowboy Dave on Wed Jan 28, 2015 12:41 pm

Allen keys, the longer the better. Remove the battery and make sure you have a milk crate to stand on.
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Re: Repairing the SCV Suction control valve

Postby RHKTriton on Wed Jan 28, 2015 5:59 pm

You could try undoing the screws via the wheel well. If you push the rubber flap up you can see the valve ( on ml ).

Main thing again, make everything clean before exposing the innards.
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Re: Repairing the SCV Suction control valve

Postby RHKTriton on Wed Jan 28, 2015 6:06 pm

You could try undoing the screws via the wheel well. If you push the rubber flap up you can see the valve ( on ml ).

Main thing again, make everything clean before exposing the innards.
Don't let the b'strds get you down!!
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Re: Repairing the SCV Suction control valve

Postby Crakas on Tue Feb 03, 2015 7:24 pm

The easiest way to get at it is via the wheel on ml, especially if you have lift. 5 minute job. I had a code come up the other day saying mine was stuck. Pulled it out and the o-ring was damaged, gave it a polish and a new o-ring.. 10cent fix for $300 part.

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