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Old 07-10-2017, 02:08 PM   #183
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I would suggest ordering an STI PCV Valve, being that you are running a closed system catch can boost from the intake manifold will travel through the hose that goes to the pcv valve and leak into the crankcase. The factory one can only stop flow of a pound or two of pressure at most. They are like 12 bucks on Amazon I think, before I put it on I was only making 8ish pounds on my 10 psi map.
PCV valve is supposed to stop the flow from the intake manifold to PCV, right?
In that case, isn't it better to use a vacuum check valve on the intake manifold exit? Don't you think there can be pressure loss at the catch can and two pieces of hose connections before the PCV valve.
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Old 07-10-2017, 02:12 PM   #184
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PCV valve is supposed to stop the flow from the intake manifold to PCV, right?
In that case, isn't it better to use a vacuum check valve on the intake manifold exit? Don't you think there can be pressure loss at the catch can and two pieces of hose connections before the PCV valve.

I would suggest deleting the PCV valve entirely and running a barbed fitting in place. Not sure when I posted that, but I soon found out that STI valve was a piece of shit too.
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Old 07-10-2017, 02:14 PM   #185
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PCV valve is supposed to stop the flow from the intake manifold to PCV, right?
In that case, isn't it better to use a vacuum check valve on the intake manifold exit? Don't you think there can be pressure loss at the catch can and two pieces of hose connections before the PCV valve.
He's running a vent to air system, and he has his gauge connected to where the PCV hose was connected. I ran a mishimoto catch can for a year with boost and no check valve with no issues. I recently installed one and there is no difference. As far as I have seen his EVAP and PCV hoses are connected properly. I still suggest putting as much stock parts back as possible to make sure they're not the problem.

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Old 07-10-2017, 04:05 PM   #186
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I also ran a VTA catch can for years, using the top manifold PCV port (the one Kris is using for his boost gauge) as boost signal to a vacuum manifold for gauge and BOV signals. Setting up the PCV that way is OK to keep the stock PCV as it won't see boost.

Also the Fuel Pump should not be putting any different fuel pressure than stock. The FBM 485 pump kit just replaces the fuel pump, it still uses the stock fuel regulator inside the tank pump canister.
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Old 07-10-2017, 07:01 PM   #187
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I do this by hookin a fuel pressure gauge between the feed line and the fuel rail correct ?
that will work fine since you don't have a return system. go out for a drive and watch when you are at idle and wot make sure it stays around 56 pounds
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Old 07-11-2017, 03:20 PM   #188
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looking to try and borrow a new MAF sensor and see also. don't know if this would be related to my problem, but just want to scratch everything off my list of possibilities
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Old 07-11-2017, 08:06 PM   #189
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So got a MAF sensor to borrow out a car belonging to a friend.

It did NOT make one difference.

so I decided just for the hell of it I'll unplug the MAF sensor and see what happens, it started up perfectly and idled perfectly in the "warm up" map at around 1500rpm, and then gradually came back down to around 900-1000

With the sensor plugged In I noticed that the wide band reads around ~17.~ which I think is why it won't idle because it seems to be starving for fuel, when I unplug the MAF sensor the car fires up and idles with the wide band reading ~11.6~12.1~
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Old 07-11-2017, 11:55 PM   #190
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So got a MAF sensor to borrow out a car belonging to a friend.

It did NOT make one difference.

so I decided just for the hell of it I'll unplug the MAF sensor and see what happens, it started up perfectly and idled perfectly in the "warm up" map at around 1500rpm, and then gradually came back down to around 900-1000

With the sensor plugged In I noticed that the wide band reads around ~17.~ which I think is why it won't idle because it seems to be starving for fuel, when I unplug the MAF sensor the car fires up and idles with the wide band reading ~11.3~11.7~
I might be wrong (someone correct me if I am) but I've read that on cold start ups the ECU doesn't use the MAF sensor to idle. It's only used on warm start ups which is why you notice the idle difference.

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Old 08-22-2017, 10:56 AM   #191
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Hey guys,


so little update, been out of it for a while.


I sent out my GDI injectors to be cleaned and tested at South Bay Injectors, also to have the seals replaced, turned out one of my GDI injectors were "not working the way it should be". so I went ahead and bought a brand new one and installed my 3 refurbished injectors and one new injector.


my vacuum is reading quite a bit better (.37-.40 bar at idle), guess the seals did need changing.


BUT, I STILL HAVE THE COLD START/NOT WANTING TO IDLE WHEN IN COLD START MAP PROBLEM. it would sometimes try to idle around 500rpm and then every now and then the rpms would jump up to 1700ish rpm and then back down to 500rpms and eventually stalling.


once the car comes out of the cold start map, the car would idle perfectly. starts perfectly when hot also.


I also notice that while free revving, the engine has a lean spot and a misfire around 2000-2500ish rpm.


really getting frustrated now, haven't been able to enjoy my car for 8 long ass months now
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Old 08-22-2017, 11:00 AM   #192
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Do you get any codes? I upgraded my injectors last week and when I tried to start it, it kept stalling and when it fired up it kept revving from 500-1500 like you mentioned. It threw a code, P062D, my direct Injector ECU wasn't grounding through the factory bracket for some reason. I wired it to one of the the ground bolts next to the battery and it started fine. I would check your Direct Injector ECU as it might be the culprit. It might be grounded but some wires or plugs might be loose.

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Old 08-22-2017, 11:25 AM   #193
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Do you get any codes? I upgraded my injectors last week and when I tried to start it, it kept stalling and when it fired up it kept revving from 500-1500 like you mentioned. It threw a code, P062D, my direct Injector ECU wasn't grounding through the factory bracket for some reason. I wired it to one of the the ground bolts next to the battery and it started fine. I would check your Direct Injector ECU as it might be the culprit. It might be grounded but some wires or plugs might be loose.

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Thanks for a quick reply.

NO, I do not get any codes what so ever.

I've thought about the direct injector ecu also, but I've back checked and triple checked and made sure to inspect all grounding points.

U think I should try running a ground wire from the ecu bracket to the battery to try for the sake of it ? Just not sure because I never got this kind of code
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Old 08-22-2017, 11:29 AM   #194
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Thanks for a quick reply.

NO, I do not get any codes what so ever.

I've thought about the direct injector ecu also, but I've back checked and triple checked and made sure to inspect all grounding points.

U think I should try running a ground wire from the ecu bracket to the battery to try for the sake of it ?
This is what I did and it started right up. Been running it like this for 5 days now and no issues. I added 6 more wires just incase just one wasn't enough to move all the current. I'll sand down the bracket where it contacts the ECU later and hopefully it works again. If not I'll get a Velox bracket.

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Old 08-22-2017, 11:47 AM   #195
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This is what I did and it started right up. Been running it like this for 5 days now and no issues. I added 6 more wires just incase just one wasn't enough to move all the current. I'll sand down the bracket where it contacts the ECU later and hopefully it works again. If not I'll get a Velox bracket.


so you do not have your Direct Injector Ecu mounted into the stock location anymore? or am I just seeing your picture from a weird angle?










were your idle symptoms only when in the cold start map also?
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Old 08-22-2017, 11:49 AM   #196
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so you do not have your Direct Injector Ecu mounted into the stock location anymore? or am I just seeing your picture from a weird angle?
Nope, it's held on by zip ties. When it didn't ground I thought maybe I didn't torque the bolt enough and ended up breaking one of the bolts 😅

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