SCV (Suction Control Valve)

[gundam]

OT: sir arsen pa help naman. Dito kita na catch eh. For a montero with 2.5 VGT. Sprint booster or racechip pro. Pros and cons.

* sundan ko na lang kung san thread dapat. TIA

[arsen]

For your info, sa design may fail safe postion ang mga valves lagi. Kung nakakita ka ng P& ID (piping and instrumentation diagram) naka-indictate ang fail position nya, FC ( fail close) or FO(fail open) or FL(fail last) - kapag nag fail yung actuator whether solenoid fails, or pneumatically fails to the safest position by design. So kung by design yung SCV ay nakakabit sa suction ng HP pump as a dumping valve just like in Bosch design (to dump fuel back to the fuel tank) which is normally open when de-energized, that's the safe position. If won't increase on RPM when SCV stuck * open position and will lose rail pressure.
I understood your point, SCV can also be installed in series with the suction of the pump (not as a dumping valve). When OPEN is more flow, more pressure. So if this is the case, the SCV being NO is not the in the failsafe position. If solenoid fails or maybe valve stuck up mechanically , there's a tendency of high pressure. But of course there is a pressure safety valve to avoid over pressure.:-)

Are you really talking about Piping & Instrument Diagram? Or Process & Instrument Diagram? P&ID din kasi tawag ng mga Instrumentation Engineers dyan.

In my years of working with our P&IDs (Piping & Instrument Diagrams) and supplier/vendors P&IDs I never seen your FC/FO/FL. We only reflect kung Energized or De-energized ang position ng valve same with our Supplier/Vendors kaya nagkakaintindihan kami.

Designer ka ba Pidok? Yung active component mo yun din ang failsafe device? For us kasi, we uses passive devices to keep the system safe in case of failure.

Back to the commonrail system, I think both Bosch and Denso uses a passive device called pressure limiter as the failsafe. Find it in the (schematic) diagram. Nasa dulo yan ng rail.

Again, the SCV of Strada's denso system has no failsafe sunction. When the SCV fails (stucked/loose wiring/not energized) it is on the normal (OPEN) position.
So sign of Strada SCV failure is an increase of engine power due to abnormal high pressure. Followed by power loss when the failsafe device called pressure limiter cracks open (Pressure drops from 220 MPa to 50 MPa). Power returns when the rail pressure rises back to the 150MPa to 180MPa operating pressure.
Possible na paminsan-minsan lang na mangyari ito (halimbawa natinga ang valve heheh) or some loose wirings. Pero kung sira talaga ang SCV it will be annoying to drive the vehicle pero it is not prone to stalling.

[vanzie_atlantic]

Mga sir, tanong ko lang po kung paano pag vent ng tubig sa fuel system ng Montero? Kasi nasira daw sabi ng casa yung SCV dahil contaminated ng tubig yung diesel ng sasakyan. Para sa sunod maiwasan ko na mangyari ulit iyun. Una sabi nila ibaba lang yung diesel tank at linisin, tapos last kailangan daw palitan yung tanke at yung SCV kaso wala pang available na SCV. Ewan ko kung tama ang pandinig ng anak ko at siya kasi ang nagdala sa casa na palitan din yung tanke. Sana macover pa ng warranty iyun. Hindi ko kasi alam pag vent ng tubig kung meron man sa linya. Yung convention na makina alam ko pero sa CRDI, hindi. Thanks in advance sa mga payo!

[ar24458]

I had my strada SCV replaced at 30K mileage due to stalling.
Now (55K mileage) problem starts again.
Sometimes when I rev the engine, rpm is not responding. stucked to idle speed.
Could this be a SCV prob again?
what I do is stop the engine for a while, shutdown, then start again.
Need help badly

[zix888]

I had my strada SCV replaced at 30K mileage due to stalling.
Now (55K mileage) problem starts again.
Sometimes when I rev the engine, rpm is not responding. stucked to idle speed.
Could this be a SCV prob again?
what I do is stop the engine for a while, shutdown, then start again.
Need help badly

Walang CEL?

[Atioan]

(Kwento ng hindi magaling sa mga kotse. hehe)

Meron akong monterp GLS SE 2009 Ed. 80k mileage. Ganun din, parang humihinga kapag binabanatan ko. So pinunta ko sa casa. kapapalit lang yung mga dapat palitan (karamihan oil) yung iba linis. If I'm not mistaken 80,259k yung mileage nung pinalitan, current is 80,412k. Bale pinalinis ko yung SCV, ayun ok na, I hope na hindi na bumalik. I'm still observing kung babalik pa yung sakit. So tama sila hindi EGR sakit, suction daw, kaya nilinisan. Kapag daw bumalik yung sakit, SCV nga talaga..

Pero tanong ko lang, nung hindi pa nalinisan at parang humihingal hingal pa yung montero ko, umaabot pa sa 3.5 yung rpm kapag binabanatan ko bago ako mag shift sa 4th gear under 3rd gear (Manual Mode) pero nung pinalinis ko na yung SCV, hanggang 2.8 nalang. E sobrang baba naman ng tapak ko, ano kaya problema???

[MAXIMUS08]

Sir ask ko lang liban sa casa at eldorado meron pa ba shops or store selling scv ng strada?

[MAXIMUS08]

13270.00 sa casa. Eldorado 11+k.

[edansramos]

Share ko lang experience ko with faulty SCV. (Engine: 2KD-FTV (Hilux MK6 D4D))

Was experiencing 'sinok'. loss of power in low gears/RPM, minsan stalling. Odo is near 100K kms. Had it electronically diagnosed and result was negative. Pushed my luck and did a DIY with my SCV and EGR since expensive yung replacement parts. Its been a month since i cleaned the SCV and no signs of those symptoms yet. SCV is very easy to dismantle, cleaner costs around 200 php plus the o-rings. And don't forget to add 2T oil in your tank to keep your SCV and other fuel line components clean and well lubricated.

Thanks and have a great metro-manila traffic!

[zix888]

every fuel filter change, make sure you also clean the scv