If You Boosted A N/A Protege, READ THIS

[glyph]

if you're boosted, did you put the check valves on there?

 

[BlkWidow]

if you're boosted, did you put the check valves on there?

I did the check valve too.

 

[glyph]

dunno beyond that, sorry... I personally never installed the check valves (which could be the reason I'm not getting the boost I should, now that I've installed a higher PSI spring in my wastegate), but I've never had any problems, myself.

 

[CrazyCaker]

If you are having filling issues, take the valve out! It seems that this valve is preventing vacuum from the purge solenoid as well (or vacuum is being created over time), and from my gatherings this vacuum is required in order for the canister to drain properly.

I had this valve installed for nearly 2 yrs, and my filling issues slowly started over time. Getting worse and worse, to the point where I could only put a few cents in at a time. I took the valve out and my filling issues were gone immediately. The same as glyph, I have absolutely no issues without this valve. Seems to me it causes more issues then good.

Please note, that the filling issues progressed over time. So before you post saying you have this valve installed and do not have a filling issue, take that into consideration. There are no other reasons that solved my issue besides the removal of this suggested check valve. Removing it was all I did, and it solved it right away.

 

[shane02pro5]

This valve comes on a stock msp doesn't it? I'm curious since I have a leaning out issue cruising at light throttle around -10in/hg in all gears. Worth a shot to pull it off

 

[CrazyCaker]

This valve comes on a stock msp doesn't it?

While it appears that there is a check valve on the line which is stock for the msp, the valves themselves are very different in appearance. Just look at the pic of the valve in the first post that's being used (0000-88-C67), and the pic that TheMAN posted on the first page. The valve in the diagram (19-926) is completely different in appearance. Now, can anyone tell me if these 2 valves operate the same?

 

[justanothermp5]

i got the valve but i completely forgot to put it on
is it ok if i drive without it? i got a check engine light already but it may be random missfire
been getting that one alot lately

 

[sephiroth]

i got the valve but i completely forgot to put it on
is it ok if i drive without it? i got a check engine light already but it may be random missfire
been getting that one alot lately

A check valve just prevents vac/boost from reversing (or going the direction the valve is facing) in a N/A car the engine doesn't create enough positive pressure for it to be a problem, in a F/I car the boosted pressure going the wrong way can cause w/e device the line is connected to, to work incorrectly or fail.

Short answer: No.

You wouldn't run your car without a BOV/BPV would you? Same principal.

 

[CrazyCaker]

The only thing I can think of that might be different is the cracking point on the valves. The one that comes stock on the msp may have a higher cracking point, allowing for some vacuum to pass through it, but preventing boost from the other side.

Can someone with an msp verify if the stock check valve is also a disc style valve (like the one suggested)?

 

[CrazyCaker]

If you have installed this valve and have tank filling issues, remove it! This valve is causing your problems.

This valve is the wrong part to be using. It should be a "multi-port" check valve, not a "one-way" check valve.

Here is what I have found out...

Modern internal combustion engines generate approximately 20% of all of their hydrocarbon emissions by evaporative means, and as a result, automobile fuel vapor emissions to the atmosphere are tightly regulated. For the purpose of preventingfuel vapor from escaping to the atmosphere an Evaporative Emissions Control (EVAP) system is typically implemented to store and subsequently dispose of fuel vapor emissions. The EVAP system is designed to collect vapors produced inside an engine's fuelsystem and then send them through an engine's intake manifold into its combustion chamber to get burned up as part of the aggregate fuel-air charge. When pressure inside a vehicle's fuel tank reaches a predetermined level as a result of evaporation, theEVAP system transfers the vapors to a charcoal, or purge canister. Subsequently, when engine operating conditions are conductive, a purge valve opens and vacuum from the intake manifold draws the vapor to the engine's combustion chamber. Thereafter,the purge canister is regenerated with newly formed fuel vapor, and the cycle continues.

As opposed to vacuum in naturally aspirated applications, at higher throttle levels a turbocharged/supercharged engine's intake manifold can see relatively high boost pressures generated by forced induction. A purge valve, which is not designedto withstand high boost pressures, can sometimes be damaged under such conditions. Damage to the purge valve, in tun, is sufficient to incapacitate an EVAP system. Typically, a simple check-valve is employed in a purge harness of an engine with forcedinduction to prevent high boost pressures from impacting the purge valve.

In addition to fuel vapor recovery function, an EVAP system is required to perform a leak-detection function. To that end, a known analog leak-detection scheme employs an evaporative system integrity monitor (ESIM) switch which stays on if thesystem is properly sealed, and toggles off when a system leak is detected. When the ESIM switch is toggled off, an engine control unit (ECU) detects the change and alters an operator of the vehicle with a malfunction indicator.

Furthermore, an EVAP system's ability to detect leaks must be regularly verified in engine key-off mode via a so-called rationality test. The rationality test confirms the ESIM switch functionality through a simulated system leak which isgenerated by opening the purge valve to relieve a low level of system vacuum (approximately 0.5 KPa) retained from when the engine was running. An ECU then looks for the ESIM switch to toggle from on to off, which is an indicator that the switch isfunctioning correctly. For the rationality test to be performed in a forced induction engine, however, a leak-detection scheme utilizing an ESIM switch requires a two-way low airflow communication between the purge valve and the intake manifold. Asimple check-valve does not permit two-way flow, therefor it will not support both purge valve over-pressure protection and ESIM functions in an EVAP system of a forced induction engine.

The bolded section explains all. And explains why I had the collasped hose from vacuum being created. I just couldn't figure out why the vacuum was there.

So knowing this now, the REAL valve that is required here is not a "one-way" check valve, but a "multi-port" check valve!

Edwin, do you have the proper part number for this?!

 

[LinuxRacr]

Are you saying that the info I posted (which I got from Edwin) is wrong?

 

[16902]

hmmm

 

[TWISFM]

sub for ridiculousness about to happen

 

[BlkWidow]

sub for ridiculousness about to happen

Why? The fourm is for helping each other out, not taking things that are typed on screen so serious. I have to try removing the vavle to see if it fixs my filling issue.

 

[TWISFM]

because it means edwin was wrong...iirc edwin is (TheMan)?

 

[CrazyCaker]

Are you saying that the info I posted (which I got from Edwin) is wrong?

Since it is a one-way check valve that is being recommended, yes.

 

[justanothermp5]

uh oh...

 

[Alamo1]

Sub

 

[khaosman]

I can't wait to get my P5 out of storage and try this. Then I can accurately see how terrible of gas mileage I'm getting!

 

[shane02pro5]

Made a couple visits to the dealer yesterday...

The parts guys printed out the same diagram for the fsde-t like THE MAN posted in post #11 and the diagram did not show the delay valve thats listed as 19-926???

19-926 comes up on his inventory as a connector for $1.xx so I also ordered the 000-88-C67 $12.xx (listed as a check valve which may in fact be a 2way delay valve)