SCV - Suction control Valve

[Newguy]

Anyone here had any trouble with this valve, after a few weeks of running the fuel pressure wound up when i am in 3rd 4th or 5th gear with my foot flat from 3000rpm - 3500rpm there can be dead spots. Power sort of goes flat momentarily then power comes back on then off and on to 4200rpm.

I am wondering if this valve is causing me an issue, couldn't find any other threads with the search facility.

Has any one taken one off to clean?
Do i need a new gasket if i do?
I have turned my fueling back down and it is all OK, just want to find out what it could have been?

[irwazza]

Mine done the exact same thing. Mitsubishi replacing the scv valve under warranty

[Tony]

I'd be looking at the rail pressure limiter by the sounds of that. Have you got the Hi-spec limiter or a disc fitted?

[Newguy]

Ive got the Hi-Spec Limiter in place from chip it tony.
Wouldn't have thought it was that but it could be??

[Tony]

Anything is possible.

Shoot me a PM and I'll organise you a replacement as an exchange just in case.

BTW, what tunes have you been running?

[Newguy]

As im running the Chip that i am tony, i have no idea what tune im running, i had the fuel trim and timing turned right up.
Was running very well, now it is probably running aswell, i just need my duel cable to up the boost to burn the extra diesel, Downpipe should be here soon.

What do i look for in the SCV any one know?

[Newguy]

Just went for another test, it must be the valve opening Tony and bleeding a bit of pressure, as it stops if you drop the gas pedal and then jump back on it then it does it again.

Turned my fuel pressure back down.

[borngeek]

http://www.newtriton.net/phpbb/viewtopic.php?f=38&t=9142&hilit=suction+control+valve

sits on the back of the injector pump.... you cant look at much.

[Newguy]

Sweet, so ill forget that it could be the problem then.

[Newguy]

So I have replaced the limiter and i still had the same issue pulling pulling pulling then no pull then she comes right.

Something went wrong today I was giving it a good test run from.0 to 160 went limp and now I have the chip unplugged as my fuel pressure won't raise over 6700psi. I drove the rest of the 200km trip.

What should I start to look at? I'm back to wondering about svc or the pressure sensor on the rail?

Feels like I'm driving a great wall ute now :p

[irwazza]

What chip are you running?

[Newguy]

I am using the common rail pressure sensor chip. I have the chip unplugged from the system now.

[irwazza]

Is that the one supplied by chipit?

[Newguy]

Sorry no it is supplied by racechip.de
Google racechip.
Dunno what's shit itself

[irwazza]

And your car runs normal with the chip not plugged in?

[Newguy]

Not won't rev over 3000 and the fuel pressure does not get above 7000psi. What ever was causing my issue has buggered itself I think.

[irwazza]

Have you checked the fuel rail plug for bent pins?

[Newguy]

Pins are fine. All connectors checked. Still got 18psi of boost usually 22psi but it must be done because of the lack of fuel.

[Newguy]

Also I have no check engine light or any faults on the obd reader. Cleared exult faults also incase they were hidden....

[Brett05]

I have been chasing this problem for almost two weeks now. The surging was that bad that I wanted set fire to my beloved ride. I was so convinced this morning it was fuel filter related, I bought another filter and installed it at work today........drove home with the same problem as before the filter was fitted. I got home and removed every mod I have done to the engine. I removed the Suction Control Valve, Swirl Control Valve and what ever else I could unbolt, cleaned and checked it.....every time I removed a mod or part, I would go for a drive to see if the problem was solved......four hours later, it came to the common rail plug the caught my attention, I pushed it in to check and it moved about 3 mm......thought to myself, that wasn't right.....unplugged it again, sprayed a little bit of WD40 in there just for the hell of it, blew it out and went for a test run.....it never skipped a beat.....I had the biggest smile on my face after that. I put all the mods back on and installed tune 8.....this this is a jet now....I was so close to dropping it off at the service department and letting them deal with the problem.....I'm glad I persevered....not only do I have the satisfaction of fixing the problem myself, I probably saved myself 5-6 hundred dollars

side note: taking off the SCV and looking down into the upper manifold.....absolutely clean as (almost three years).....the blanking and catch can are doing there job beautifully

[Newguy]

Will try this in the morning, I have only got crc. It is such a silly issue.

Did you have a check engine light?

Cheers stew

[Brett05]

I never got any engine check lights.....just the bloody surging

[Mooons]

I have been chasing this problem for almost two weeks now. The surging was that bad that I wanted set fire to my beloved ride. I was so convinced this morning it was fuel filter related, I bought another filter and installed it at work today........drove home with the same problem as before the filter was fitted. I got home and removed every mod I have done to the engine. I removed the Suction Control Valve, Swirl Control Valve and what ever else I could unbolt, cleaned and checked it.....every time I removed a mod or part, I would go for a drive to see if the problem was solved......four hours later, it came to the common rail plug the caught my attention, I pushed it in to check and it moved about 3 mm......thought to myself, that wasn't right.....unplugged it again, sprayed a little bit of WD40 in there just for the hell of it, blew it out and went for a test run.....it never skipped a beat.....I had the biggest smile on my face after that. I put all the mods back on and installed tune 8.....this this is a jet now....I was so close to dropping it off at the service department and letting them deal with the problem.....I'm glad I persevered....not only do I have the satisfaction of fixing the problem myself, I probably saved myself 5-6 hundred dollars

side note: taking off the SCV and looking down into the upper manifold.....absolutely clean as (almost three years).....the blanking and catch can are doing there job beautifully

I'm confused I thought the SCV was attached to the fuel pump not the manifold & the EGR was on the upper manifold
Best I do some more reading

[Newguy]

Svc is on the fuel pump. I feel mine maybe stuck open. Letting most of the fuel back to the tank and not to the pump. Will clean the rail sensor pins also

[Newguy]

So i pulled the scv out, looks ok but who would know. Gave it a tap and a clean rotated 180 degrees and re installed. Checked the rail connector. Cleaned and re installed. Went for a run and there is no change.