[Telion]

Right on telion! Props from me Congrats on running yours.

As for the boost issue it sounds like the same I was running into. After checking things for 3 days straight we left it be and waited till the EMS arrived. We did find one vacuum issue when we checked everything again(about 4 weeks later, it was a kinked line) but we never tested it till we ran the EMS and so far no issues (knocks on the hardest wood possible)

I remember having an issue like this a while back and it was also a vacuum hose that seemed to be connected to something that produced the opposite of what it should (vacuum vs positive air flow). what gets me though is I can rev to 5k in idle but then when I drive it I get this issue. Time to go through the hoses I guess.

 

[Banana!]

Damn dude, I just spent the past 4 hours of my life reading this entire thread from front to back...

And i've had to change my shirt 3 times due to drool.

Props on top of props for mostly pulling this off! We need to see if we can get your posts copied out into a seperate thread so people can read through your whole build without having to sort through 1000+ conversational posts.

 

[Guest]

I wish I could be of more help telion but your double my setup and on top of that you don't have the parts I have.

For instance there is no trace of VIS on my gs where yours I think still does? Little things like that make different scenarios for each person.

Being I don't know the engines very well does something happen at 2k rpm that might have caused it? Like VIS starting to open and causing havoc? If it does try making vis stay closed or leave it open and see if the problem continues. Check your waste gate lines also.

 

[Telion]

Thanks Banana Man lol It is quite long (missed that thread) I will go through it at some point and create a thread of just the process including the mishaps once it's done.

Thanks Well so far the first things I will try tomorrow possibly is up-ing the fuel pressure seems I am running about 6psi too low, and then there is a check valve on hose #4 that I failed to put on, so I will put that on and see where I stand from there. I doubt it would be the wastegates cause that is unrelated at so low RPM's and in vacuum

 

[reboticon]

Do you have an A/F gauge hooked up? Does your head unit display A/F or the 02 voltage? It seems to me that those 450cc injectors would be running rich as hell before the boost. I mean thats almost double stock, so if they are pulsing at stock or a chipped bigger than stock rate, it may be starting to flood at that rpm point?

 

[Telion]

450's not hooked up yet but here are some of things that could help define the issue.
-stock fuel pump
-Idles fine, right at 14.7
-revs fine.
-I am running a stock ECU
-SAFC is zeroed out for test purposes

-When I rev it sitting still my FPR gauge drops to like 20psi from 40psi.
-Another possible issue is that it has sat for 6+ months now; could the gas be bad?
-Could something on the fuel pump gone bad?
-Possibly the 6an hose is too large for the stock fuel pump?
(injectors should still see the same amount of psi)
When I drive it at about 2.5 RPM's it goes as lean as 17-20 AFR (loss of fuel pressure)

I doubt that it is the map sensor because it would see more air and add more fuel. You know this really resembles the issue I had when I put the 450cc injectors in there, I wonder if if it had been going out for a while?

 

[Telion]

Ok current theory is if it is not a part of the solution it is apart of the problem so I replaced the fuel pump tonight I won't do a whole DIY but here is what I did.

removed the old unit

Here is a shot of everything side by side OEM on the left

I cut the little rubber support a little so it would fit the Walbro better

Here is a shot of the Walbro in place. I went with a little thicker ground wire and shrink wrapped the ends for safety measures. I also ziptied it in place to ensure it was nice and snug (not necessary but it made me feel good)

Tomorrow night after work I will fire it up and see what she does now.

 

[DSL]

while youre at it, should change the gas, too. old gas is no good especially boosted cars... just siphon it out an put it in your other car. Put new fresh fuel in the tank

 

[reboticon]

Yeah replace that gas while you are at it or put in an additive. It definitely sounds like a fuel line/flow problem, not a sensor problem, from what you have found. I had a similar problem recently in a civic and It actually traced to the fuel return line right past the regulator, where the line mounts to the rail there was a tiny pin prick leak that was causing me to lose all fuel pressure when the regulator tried to just bleed off a little.

 

[car2n]

Telion I have a high volume fuel pump that is part of the CT super charger kit, I don't know if fits the G2 but if you can check that and if you can use it I sell it to you for a fair cost.

 

[Telion]

^Thank but unfortunately that is not the issue the Walbro I just replaced the stock pump with is working nice it is something else, I am wondering if it is the fuel pressure regulator. because when the engine revs I lose about 30 psi.

 

[car2n]

In what part of the fuel system is the fuel press. sender installed? you might need to take return readings and supply also and maybe this will help to find where is the pressure loss.

 

[Telion]

^ You lost me on the sending unit? However the similarities of this post are too great to overlook I think the leak is in the setup at the manifold itself at the rails, I will redo all this this weekend and I may as well throw the 450cc's back in.

Figure with this title I can always come back to it instead of making a new thread everytime I have an issue I cannot solve.

Ok with this issue here are a few basics you may ask or need to know

Setup: TII cams, springs and manifold, 450cc DSM injectors, stock fuel pump, stock RL FPR, assisting Megan Racing FPR for fuel trimming (before stock in the line to the injectors, worked fine before). For those that knew yes I corrected the vacuum lines. (and no more EGR CEL fixed that too, none at all actually)

The issue: The car idles and runs fine under normal to slightly over medium acceleration (at a current average of 14.3 to 14.5 AF, good enough for now.
But as soon as I go to 3/4 or full throttle the car dies out. It is very similar to what it feels like when you hit the Rev limit (but there is no CEL). when this happens the AF drops to an average of 10-11 AF. Now here is where it is different than a rev limiting effect, when you hit and stay at your rev limit your car is still strong and has a higher pitched dee dee dee dee dee (lol).
But in this case it is a very boggy sluggish type effect.

My first thought was ok too much fuel up top 3-5k.
Then I realized I could create this issue at any RPM by laying on the gas.

So my current thoughts are the DSM's throw down way too much fuel for the current setup under full throttle and the FPR's are not fully functioning.

I wouldn't think it to be timing as the stock injectors never did that and the springs can't (to my knowledge) throw it that far out of whack (especially with TII ignition maps.

And I wouldn't think that it was a lack of fuel due too the AF ratio.

tomorrow I am going to throw the stock injectors back in and see if that fixes it. If not I am stumped.

So what are your thoughts?

 

[Telion]

Ok Hybrid after reading the manual for an hour or so and then racking my brain for another hour I realized you were on to something with the o-rings hence the above. But you had the wrong set of o-rings I knew that the Walbro didn't have o-rings so I basically dismissed you saying check the o-rings on the fuel pump connection. However when I put the 450cc injectors in the first time I made my own o-rings because of their larger size and what could have been happening then is that air was leaking into the system and causing the same type of issue as I am experiencing now. Not enough for fuel to leak out due to being under throttle (read that in a G1 thread while researching) but enough to let air leak in. Causing a spike in AFR and a loss in psi at the FPR (guessing). So knowing how tight the fit is for the 450cc injectors with the Legend o-rings I lubed them up (lol Kyle kills me) and forced them in to create a super tight seal. Will this work :dunno: but it will eliminate one other possibility. Now I have to chip an ECU to get it to fire up with those injectors lol. Hopefully tomorrow I will know but I got a get at least 4 hours of sleep (good sleep now knowing that I have done this).

 

[Guest]

Telion, I don't know if you have a fuel pressure gauge that reads where you can see it easily. But if your getting a solid seal in the fuel system, click the ignition to position two (primes fuel pump) and watch the gauge, it should NOT drop or move until it cycles again. The pressure should stay at 45psi (or whatever yours is set at) until the next cycle. If it is slowly dropping be sure to check your fuel fittings (I don't know if you have much custom lines but for me I had one loose fitting right at the AFPR and would drop 5psi and didn't notice it for awhile).

Hope that helps a little. I wish I had the dsm injectors to help you but I went with PTE injectors. By KY jelly does wonders

 

[hybirdgsrlegend]

LMAO i was also thinking that maybe it might be the injectors because when you just finished building the car you had fuel leaks on the injectors and at this point any thing worth giving it a shot.

 

[BUZZARD]

-When I rev it sitting still my FPR gauge drops to like 20psi from 40psi.

Pump, regulator , filter. System leak or system blockage. To drop from 40-20 psi on a free rev, if it is a leak you will know all about it. Have a fire extinguisher handy

Chris

 

[Telion]

Thanks for the input guys, we'll see here shortly and yeah I can easily view the FPR gauge dropping remember it's the Aeromotive FPR as in the pick (had to lol)oke:

I will be trying to fire it up again in about an hour or so.

 

[reboticon]

Is that fpr vacuum controlled? what kind of readings do you get if you disconnect vacuum and free rev it?

 

[Telion]

Hell I don't know now I can't even get it to start. I don't think my injectors are getting power, this also happened last time. So I will worry about it either tomorrow or over the weekend. Somewhere on here is the type of Aeromotive that it is I can look. Sorry just frustrated for the moment.