Fuel cut before boost

suby25 · Post by **suby25** » Tue Mar 07, 2006 5:14 pm

V - I don't mean to come across as an ingrate, I will take pictures when I go get lunch in an hour. I've been running around town all morning and I haven't had time. I really do appreciate the help you guys have been giving me. Please don't take my post the wrong way.

I will try to manually extract the codes, but I don't know for sure how the ECU is wired up. I did not do the swap on the car, so I'm not positive the wires I need are even there. I'll give it a shot and see what I come up with. Thanks for all the help guys, I really do appreciate it.

vrg3 · Post by **vrg3** » Tue Mar 07, 2006 5:35 pm

I wasn't upset, just frustrated... we just need you to help us help you.

You're going to have to learn a lot about the car... that's the nature of vehicles with swaps such as this.

suby25 · Post by **suby25** » Tue Mar 07, 2006 7:14 pm

I posted pics at
http://www.rs25.com/forums/showthread.p ... post769855

Hopefully those are enough, if not I can get more. I tried resetting the ECU using the steps on the site you posted, but the CEL came right back on. Oh well....thanks for the help, this is defiantely going to be a learning experience.

vrg3 · Post by **vrg3** » Tue Mar 07, 2006 7:25 pm

What were the codes?

suby25 · Post by **suby25** » Tue Mar 07, 2006 7:29 pm

No codes yet, I'll get to that tonight.

Does the intake/TB look stock to you?

vrg3 · Post by **vrg3** » Tue Mar 07, 2006 7:34 pm

You're using an EJ22 TPS. The cut insulation on its wires are a problem though! I can't believe anybody would leave them that way after a swap. At the very least you should use some electrical tape to seal them back up.

I'm not familiar with the throttle body there... I guess it's your car's stock throttle body? I guess they somehow attached the EJ22 TPS to that throttle valve... the idle switch in the TPS needs to be pretty carefully calibrated, though, so I'm a little skeptical that this setup will work right.

I guess they used this throttle body because they were able to get it to clear the WRX intercooler that they put on. For the moment, I would actually suggest that you remove the intercooler (replace it with the plastic pipe from a stock EJ22T) and swap throttle bodies -- get a used one that still has the TPS attached and calibrated.

That last picture is the EJ22T IAC valve. That's the one you should be using. Where is the big hose from it going?

The wiring by the pressure sensing equipment doesn't look confidence-inspiring.

Which hose is the one you plugged?

Can you take a picture of the intake manifold?

vrg3 · Post by **vrg3** » Tue Mar 07, 2006 7:35 pm

Pull the codes! Don't try to clear them when you don't even know what they are!

suby25 · Post by **suby25** » Tue Mar 07, 2006 7:56 pm

its that the pcv valve? the one that is screwed into the intake, if so, its funning back into the intake...

the hose running across the top of the intercooler is the return line for the by-pass valve.

what is the thing on top of the throttle body that has the orange gunk all around it?

vrg3 · Post by **vrg3** » Tue Mar 07, 2006 8:05 pm

The PCV valve is the one screwed into the intake manifold, yes.

Just below that, with the 3-pin electrical connector, is the EJ22T IAC valve. It has a 19mm hose coming out the top, that quickly bends. The last overall picture actually shows it going where it should though.

I guess that thing on top of the throttle body is the EJ25 IAC valve. I can't tell for sure but it looks like they removed the electrical portion from it and just left what was there as a big mess. I don't know how this sort of valve is meant to work -- does it actually move the throttle plate?

Which hose is the one you plugged?

suby25 · Post by **suby25** » Tue Mar 07, 2006 8:15 pm

We plugged the top one where the orange junk is, since we thought that was the IAC meant for the car. It was originally plugged up, but can still be used to adjust idle.

Can you go on AIM? It would be easier to talk to you on that then posting msg's back and forth. I'm using suby1025 as my screen name.

vrg3 · Post by **vrg3** » Tue Mar 07, 2006 8:20 pm

I don't see which hose you're referring to.

I can't go on AIM, sorry. But posting here does have the advantage that other people can add to or benefit from the discussion.

suby25 · Post by **suby25** » Tue Mar 07, 2006 8:22 pm

Right now we have the pvc valve plumbed into the intake, is that right? Looking at the pics I have from before we took the car apart, it appears to be going into the crank case, and the other hose coming from the 'F' shaped plastic adapter seems to be going into the intake. Do you know how it should be connected?

suby25 · Post by **suby25** » Tue Mar 07, 2006 8:24 pm

The hose I'm referring to was removed for the picture, but it was attached over the EJ25 IAC, as you called it.

I agree posting on the boards does have much more value for fellow members.

vrg3 · Post by **vrg3** » Tue Mar 07, 2006 8:31 pm

Have you not read through all the sticky threads on this BBS? One of them has a link to a detailed diagram of the how the EJ22T PCV system is plumbed.

If that hose is going straight into the intake, that's wrong. You do need that "F" piece. If you're not using the stock turbo (and it looks like you might not be), then it won't fit right and you have to do some custom plumbing.

I don't see where that hose would have been attached.

suby25 · Post by **suby25** » Tue Mar 07, 2006 8:42 pm

I did not look through the stock pvc plumbing thread. I'm using a TD04 turbo and WRX intercooler.

I'll check that thread out and see where I'm going wrong.

suby25 · Post by **suby25** » Tue Mar 07, 2006 8:56 pm

Thanks, those diagrams were helpful. Off to the shop we go.

suby25 · Post by **suby25** » Wed Mar 08, 2006 7:51 am

So we pulled codes today, after the stealership was unable to.... very simple, as I'm sure everybody knows. Anyway, we came up with the following:
Past codes:
24, 32, 42, 44, 52
Current Codes:
32, 44, 52

32, O2 sensor, no surprise considering I don't have one.
44, could be a problem...
52, neutral park switch or something..... harmless... right?

So we spent hours tracing wires and evaluating the CEL's.... most of which were triggered by something else. So.... lets think about this.... I have a 5spd and I have a problem with neutral park switch.... interesting....

It turns out the ECU was from a auto legacy and the car thought it was still in park, so it would cut fuel and not generate any boost..... we just rewired the pin for the park neutral switch and bam, no more CEL's car runs like a champ..... What an obscure problem I never would have considered....

Needless to say, it was a huge relief to find out it was such an easy fix. Who would have known such a small problem would wreak so much havoc.

To everyone who contributed, thank you, I truely appreciate your help.

Cheers,
-Derek

dzx · Post by **dzx** » Wed Mar 08, 2006 9:10 am

Wow, i might have to look into this. My ecu is an automatic. but the spot between the tach and speedometer is covered so i dont know what gear it thinks its in. Was the car doing it since you got it?

suby25 · Post by **suby25** » Wed Mar 08, 2006 9:28 am

Nope, it just randomly started to buck and not build boost. I have no idea what triggered it, but it also threw many other codes. A very interesting predicament if you ask me. Quite the DIY troubleshooting experience.

dzx · Post by **dzx** » Wed Mar 08, 2006 3:09 pm

yeah, sometimes my CEL comes on randomly and it does just what you described. I'll probably try to reinstall the stand alone ecu this weekend.

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Fuel cut before boost