It fluctuates between 500-800 right after I come to a stop. It will do that for a few seconds and then usually smooths out. Gauge tells me vac is 20 hg at idle, which stays constant. Plugs, air filter and fuel filter are all new. I haven't checked the resistence of the wires yet. Guess I will do that now.How bad is it surging? what RPM's is it fluctuating at? Do you have a vac/boost gauge? how much vac. is it pulling at idle?
Glad to here it's coming along though! I'm sure we can figure it out.
I'm assuming that you have new spark plugs, air filter, fuel filter already? Have you checked the resistance of all the plug wires for consistency?
Correct. It idles fine at start up. There is only one O2 sensor on this motor, so I will probably replace that also. I don't have a fuel pressure gauge. I was also thinking the injectors might be gummed. Is there any way to clean them?So it only fluctuates after your driving a bit and then come to a stop, but not right when you start it up and let it idle, correct?
And you have a good, constant vacuum, and no leaks. sounds like it may be hunting for a good afr at idle, maybe a front O2 going bad or a fuel pressure problem. Do you have any kind of fuel pressure gauge? Maybe you could hook up an in-line fuel pressure gauge (it's pretty easy and you can borrow one from vato zone, Just be careful!) to check fuel pressure at idle, just to see what it's at and if it's fluctuating with the idle. How about the fuel injectors? they could be gummed up or one could be fubar'd. I feel like we have to be getting close, there's not much more it could be! :lol:
I don't have the snorkus in my fender any more. So I installed the intake air temp sensor in the bottom half of my airbox? Will that be ok?Hey sorry i didn't see this sooner, I'm pretty positive i know what your hunting idle problem is, We should have sent you a plastic piece that bolts to the front radiator support and runs to the snorkus in the passenger fender. In that plastic piece a small hole is drilled for for you to stick the intake temp sensor into. Iirc when i built your harness i left that sensor plugged in so I'm assuming you probably just left is hanging? Its important Pm me.
-Paul @ ECS Performance
I'm not positive that would work correctly. It may, but i would still like to see it in the stock location. Subaru' tend to run best in oem form. Just how they are, and why we have such success w/ our swaps.I don't have the snorkus in my fender any more. So I installed the intake air temp sensor in the bottom half of my airbox? Will that be ok?
That sensor is definetly not aftermarket. Look directly under your BOV. I can't remember where exactly the vac lines go (I'll look again later).As for that really blurry pic you posted about the "sensor" with the broken off vac tube, I don't have anything like that on my engine, or at least that I can remember. From what I can see, it almost looks like an aftermarket boost control solenoid. But, it could also be the sender unit for an electronic boost gauge of some sort. What's the vac line coming out of it connected to? If it's going to the "T" in the vac line coming out of your BOV, or some other vac line going into your intake manifold, I'm almost sure it's the sender unit for an electronic boost gauge.
One vac line goes the the intake manifold. Smallest line pictured here.That sensor is definetly not aftermarket. Look directly under your BOV. I can't remember where exactly the vac lines go (I'll look again later).
No need to take your intercooler off. I just wanted to make sure your V5 had that sensor as well. I am still trying to figure out what it is or a part number so I can order a new one. I will probably pull my intercooler off tonight and see if there is a part number on it.Just got home and the engine is still pretty hot, so I peered under there just a bit.
You are correct, there is some kinda sensor there, but it's under this clusterf*ck of wires and vac lines in a very tight space, I can barely even get a glimpse of it. The only thing I can see without taking the whole intercooler off is a wire connector sticking out from under a bracket - I can only assume it is some kinda sensor. I can't even manage to see the sensor itself.
I can trace the vac line you circled back into that clusterf*ck and it seems to go into the area of that connector, but I'd still have no idea what that sensor is supposed to do.
I'd get a better look if I could take the intercooler off, but I won't have the time to do that until possibly this weekend. Hell, I gotta take off again in like 30 mins