I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

The CEL goes on cause 10-11psi spikes w/manual boost controler. I just got the car tuned yesterday & I want to keep using the mbc cause then I'll be running too rich w/6.5psi regulated internal w/g. Will check valve solve this problem? If so where do they go installed. Thanks in advance.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

First off, what code are you throwing? Is it the map sensor code? If so, then yes.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

NO.

What engine management system are you running? that should have been stated as certain ones need to see ALL the boost you are running.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

where do I mount the check valves? The car won't put on CEL
if boost is below 10 so I figure that's the problem. Where do I mount the check valves & how many do I need?

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

I'm using an apexi vafc.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

No with that you don't want to use the check valve. It must eb something else. Go to your ecu and find out what cel you are throwing then come back here and ask you quwstion. ;)

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

Try kicking down the boost a couple of notches (like maybe to 8) and you probably won't get that code (don't foget to reset first)

Or just goto the pet supply superstore and get a check valve.

This is my best assumption based on the facts.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

Just came back from petsupermarket where I bought & installed the check valves in the parking lot. Turned up my manual boost controler a lil bit. Now hitting 14psi for about 7 seconds and then the psi goes down to 10. No CEL on
whatsoever. My vafc was tunned by a pro on a dyno & it's running super smooth. The tunner said yesterday when it was tunned that it would be the ideal thing if it peaked @ 14psi and came down to 10-11 but since I didn't have the check valves installed yesterday the CEL would go on. No CEL anymore, yeehaw! ;D

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

Yay - I had this one pegged all along

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

BE VERY CAREFUL!!! once you put the check valves in conjunction with the afc the afc is not putting out the same amount of fuel for the corresponding boost presure. im runing the same thing so i know. increase your fuel with the afc to about -30 on the hi end and youll be ok. i also recommend a fpr for more fuel.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

also you should only use one check valve.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

I'm using 2. First day using them, I was gonna use three.
Is one check valve enough? Seems to work good with 2. I've ran the car hard several times today and no problems w/detonation, staling nothing. I'm gonna use 1 and see if the CEL goes on if not then 1 check valve it is.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

i ran 16+ psi with no cel using just one check valve. oh ya but the motor blew :( just make sure u add fuel!

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

yeah so where exactly would i put check valves? Sorry for the dumb question.Its on a d16a6. Thanks oh and i looked in the FAQs but didnt see anything

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

ya because its not recommended thing to do. just hook it up on the vaccum line that goes to the map sensor. dont do it if your new to turbos, yourmotor will blow. i blew up a d15 at 16lbs because the wastegate got stuck shut and i didnt get a cel. just becareful and watch your a/f

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

If you are using the hack. It is not recommended, like it was said before, the afc needs to see the boost. If you use an FMU you need check valves, but I guess that wasn't the question. I wanted to clarify, just in case there is a newb reading this and not fully understanding.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

ya thats y i only recommend one check valve. instead of the afc seeing 10psi it will only see about 7. so it will put out less fuel but it will still see boost.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

i understand that i shouldnt do it with the hack but i dont care i have a good understanding on the turbo concept and i have a wideband o2 to tune it and im using a apexi s-afc

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

Great, if you know what you are doing, do it. Let us know what happens. Might be a decent idea for track or race nights, just to boost a little more. It would be great if I had all the tuning tools, i'd do it.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

I installed the 2 check valve between the Fuel pressure regulator and the BOV vacume line. Is this the map sensor air thinga majig you're talking about?

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

:o :o :o :o NO!! thats just going to increase your boost levels!!! :o :o :o

on the 99's it should be on your throttle body. you would need to remove the map sensor, plug up the hole on the throttle body and use a T fitting to run a vaccum line to the nipple on the map sensor. then put a check valve on that vacuum line that goes to the map sensor.

i dont understand how that prevented u from getting a cel. can u take pics of your vaccum lines?

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

The fuel pressure regulator goes connected to the intake manifold & I have a 5 way T where one end goes connected to the intake manifold and the other to the fpr with the 2
check valves hooked up on top and the BOV vacume line hooked upto the thid barb in the 5 way T. No CEL. And I just read on a MBC ad on ebay that a bleeder hole in my MBC
will bleed any excess air in it and let the waste gate close faster so the boost won't fluctuate.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

mang! i dont know what to say. you only want to fool the map sensor not everything else which it seems is what your doing. take some pics ........

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

this thread is like whoa! first of all, how is putting check valves in line to your bov going to affect your map or your boost levels, maybe if it was in line to your wastegate, second i also wouldn't be running more than one check valve with the afc b/c now it's seeing less boost therefore giving less fuel, at least get it re-dynoed by the alleged 'expert' that told you it was fine to boost 14 psi, and last but not least, if your getting boost spikes from 11-14 and back to 11, it may be time for a new wastegate ;)

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

it's fluctuating cause I have a manual boost controler that doesn't have a bleeder hole below where the wastegate
connects to it. Therefore keeping air inside the mbc and wastgate not letting it close all the way after it opens @ 14psi. that's why the psi drops to 10-11 psi. I'm gonna drill a 1/32" bleeder hole tommorow and that should fix it.
It only goes to 14 psi for 5 seconds then to 10-11. After I drill the bleeder hole I'm gonna set the boost at 10 psi.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

i don't know if that's your problem, i don't have a bleeder hole in my home made boost controller and i don't have that problem, maybe like a 1 psi creep right before redline, but that's about it. are you running an internal wastegate? they're not the most reliable, if you are, i would look in to an external if you're running high boost like that, but hey, at least it's dropping not jumping 3-4 psi :-\

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

Is there anyone that knows why my boost goes from 14psi to 10-11? mbc w/6.5 psi internal w/g.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

that's more than likely your problem, internal wg's aren't that accurate in high boost applications, invest in an external ;)

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

Actually its because of your MBC. If you get an electronic boost controller it wouldnt do this. I have an article from sport compact car where they dynoed and tested about 10 boost controllers (including a MBC) and the good electronic controllers didnt show any boost spikes at all. The ones that finished first and second were the apexi unti and then the greddy unit (not the cheap one the one with digital display). I'll see if I can find the article online.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

http://www.sportcompactcarweb.com/te..._boostcontrol/
heres the article. In the magazine they have pictures and graphs but you get the idea.

Re:I get a CEL light cause of 10-11psi w/vafc. Will check valves solve problem?
 

Thanks alot JD and the rest of you. That article confirms that I need a bleeder hole before the wastegate hook up on the mbc.