Nah son I like real evo engines... ... aluminum internals.

 

You know that is I good point I'll have go through that. What you're saying is the rail is becoming over pressurized due to the efficiency, or inefficiency in this case, of the check valve. So some pressure is being released through the injector? The the scaling intern would be off when the pressure is correct then and cause a domino like fail!?!

 

Replace those injectors

 

Because the brand and model or because they possibly went bad? Got em brand new and they have roughly 5k on em.

 

enough said, recirc your bov or go SD.... no MAS ever is right with the bov VTA

 

My recommendation is based on your symptoms not your history with the injectors. AFR's swinging at idle but able to go wot is a big indicator.

 

Go to Speed Density and get a new tune. Improves drive ability ten fold. I don't know how many posts I read with people telling others to convert to SD and I always blew it off. Wish I would have done it 4 years ago instead of 4 months ago :/

 

The factory setup switches below low and full voltage depending on engine load. With the pump hardwired, its getting full voltage all the time, and during idle when very little fuel is being used by the engine, the return system cannot accommodate all that flow. As a result, the pressure builds in the return system, then the pressure at the rail rises higher than its supposed to be, and more fuel goes through the injectors because of the higher than intended pressure. If you haven't drilled the siphon, I bet $10 the hardwire is the cause of the rich idle.

 

Have you checked your MAP sensor? Mine was just doing this because the oring was broken.


Ahh I just read that your on MAF still, Yes switch to SD. Message Pure Drive Performance , Chris can work wonders for this kind of thing.

 

You ran aem series 2 and it was horrible? Have you tried different tuners or do you tune yourself? Just asking, Im no tuner, but the ones I talk to the run aem tell me its one of the easiest standalones out there for Plug and play, easy to get the car running right.

 

Dude read!

This ^ is what I'm going to dig through next weekend. Seriously thanks a lot this is a really good idea that I completely overlooked. Makes perfect sense too

I did it's all good. Thanks, I think that would pertain more to a vac leak. I know but I don't want to "cover up" the problem know what I mean.

The AEM is not the standalone for this car. Maybe Vi Pec but don't wanna toss that much cash in. I love the way a bone stock evo starts runs and drives, I just want to go faster when I hit it and not break anything... that's why my setup is the way it is. My AEM was tuned by AMS and while it was a pretty good tune it had race car issues and pissed me off a lot.

 

mrfred,
This mostly pertains to you, I went through everything. With the pump on the factory wring harness, no hardwire, I installed a fuel pressure gauge. At idle with no vacuum line on the regulator(factory equipment) it sits pretty at 43.5. With the line back on it's roughly 38psi... so perfect... I don't know man the madness continues.

 

And it still has the rich idle issue? Did you reset the ECU by disconnecting the battery? Any logs of the fuel trims?

 

Yea literally had no effect, see I actually opened up the fuel pump cover and looked in and found it was never hard wired. I had AMS install the pump because when they were tuning it it kept running out of fuel with a 255. I could have sworn Ty told me they hard wired it but I was mistaken... Nah I don't have any fuel logs I don't have a tatrix right now and I didn't see it necessary to reset the ecu.

 

cant believe you would let this go on for this long without having it looked at by someone other than ams, sure they are ams..... I have been to ams and also bushur in the past, and I was lucky enough to meet Devin Schultz bout six years ago, and since my car has been on the road, running like a top. I had an issue similar to yours, but I'm on an aem v1, was a long time ago cant remember exactly what it was but one quick trip to BP performance and you'll be good to go. I daily mine 95 miles round trip EVERYDAY, Devins tune put bushurs to shame.. wish I met him a little sooner, would a saved me a lot of gas money driving to ohio and dealing with ams. do yourself a favor, and get the fun and hassle free driving back, and bring it in to Devin you will not be sorry. looks like a fun set-up good luck getting the bugs worked out and I don't think its anything to do with injectors but boostin has injector machine also just to rule out.

sorry for long read, I'm just a lurker g\l