Popping, poofing, stumbling, hesitation

[dankberries]

I'm kind of stumped.. I've looked up and down for vacume/boost leaks and haven't found any. No CEL on. Most apparent when entering boost. Running @ 8lbs.

You can some what hear it and see on the boost gauge in this video.
http://youtu.be/_4HRjbPo6FM

[dankberries]

I'm thinking maybe the MAF is having problems. Just recently I had a new intake fabricated, the fabricator cut off the 4 bolt flange on the MAF to make more room and eliminate needing an adapter for the filter.

Maybe my cheap spectre filter isn't stopping particulates from entering the MAF, and its getting dirty..

[dankberries]

Swapped out MAF's and still having same symptoms.

[cj91legss]

How old is your fuel pump?

[dankberries]

I have never messed with it. It could very well be the original. 200000 miles I may want to check that out.

[dankberries]

Had a spare walbro fuel pump I decided to swap in this evening. Still no change, same symptoms.

I may try swaping out the FPR, I wanted to replace the vacume line going to it anyway.

[mike-tracy]

What are you doing for a bpv/bov?

[dankberries]

What are you doing for a bpv/bov?

HKS w/ recirculation

[mike-tracy]

Could that be failing?

[dankberries]

Could that be failing?

Hmm...maybe.. I could take it off and test for any difference

[dankberries]

Tested the BOV. Still having same symptoms .

Replaced the vacume line to the FPR, only because it was the only old hose on my engine . I've replaced all hoses since my rebuild 15000 miles ago. Although this didn't fix anything.

I swapped out the coil pack just cause. Didn't fix anything.

One thing I haven't done yet is swap out the FPR, I haven't located my spare yet. Doesn't seem like FPR's go bad very often if ever.
I also haven't replaced the fuel filter yet, but Im doubtful that's the problem.

I should also note the problem has gotten progressively worse, the car has a very rough idle, can't take more than quarter throttle without falling on its face.
One weird thing, when in Park it idles OK, but once in Drive its rather rough.

[cj91legss]

I can look in my garage to see if I have another one. If so you can have it for 5 bucks shipped, basically the cost of the envelope and shipping.

[dankberries]

I can look in my garage to see if I have another one. If so you can have it for 5 bucks shipped, basically the cost of the envelope and shipping.

I might take you up on that . I can let you know by tomorrow evening.

[cj91legss]

Ok.

[Legacy777]

The different MAF you swapped in, did you have that one modified like the original one?

Have you tried running an unmodified MAF sensor without the filter just to see how things run? You could just run up and down the street to see how it drives and if it changes anything? Have you checked for any active codes with the green connectors only?

When did these issues first start happening?

[dankberries]

The different MAF you swapped in, did you have that one modified like the original one?

Have you tried running an unmodified MAF sensor without the filter just to see how things run? You could just run up and down the street to see how it drives and if it changes anything? Have you checked for any active codes with the green connectors only?

When did these issues first start happening?

Josh, I did exactly that. I swapped in an unmodified MAF and took it for a test.
I have not tried the green connectors.
The car had been running fine with the new intake setup for a few weeks. Then abruptly, it started having these symptoms. It wasn't as bad at first, but has gotten progressively worse.

[Legacy777]

Do you recall if you may have had bad gas or something that might have coincided with things getting progressively worse?

[dankberries]

Do you recall if you may have had bad gas or something that might have coincided with things getting progressively worse?

I really don't recall , I want to say it was running OK on the gas that's in it.
I was hoping to try the green connectors but the car has become virtually un-drivable. The car won't go above 5mph even with the throttle fully depressed.
Its sometimes sporadic the car will not take any throttle but then all the sudden has power but then quickly falls on its face.

Here is a video of trying full throttle:
http://youtu.be/C9Fe8hh_OKA

[dankberries]

I can look in my garage to see if I have another one. If so you can have it for 5 bucks shipped, basically the cost of the envelope and shipping.

I might take you up on that . I can let you know by tomorrow evening.

I found my spare FPR, so I don't need one at the moment. Thank you for the kind offer though!

[dankberries]

Another thought that came to mind was the PCV valve, tested it, but didn't change anything.
Next I will swap out the FPR with my spare.

[dankberries]

So I swapped the FPR, no change, I tested IAC, no change.
I decided I needed to talk to the local Subaru guru.
We talked and came to this verdict, I messed up by putting used(lightly) plug wires on new plugs. Meaning, when I did my rebuild 15,000 miles ago I should have put new plug wires on in combination with new plugs. Apparently the used plugs wires some how will transfer over whatever contaminants (I can't recall what he called it) to the plug thus fouling it at an faster rate.
In the end, it was concluded that anytime you replace the plugs you should do it in combination with the wires.
He had an extra set of new wires he tossed me and I picked up some new plugs. While my plugs didn't look bad to me, I put the new ones in with new wires and the car is running again.

Smh.. I feel silly for having gone through all that for something so simple. While it was one of my first thoughts, I disregarded it thinking they where too new to be having problems.
Lesson learned here , don't second guess myself, I'm typically right the first time. I tend to over thinks .

[Legacy777]

I've never heard of this issue he mentions regarding plug wires. Plug wires will typically last much longer than regular spark plugs.

It's possible your old plug wires were just bad.

[dankberries]

Ugh..I'm having similar problems again. A couple days ago the car abruptly stopped running, loss of engine power, wouldn't take any throttle. Stuck on the highway, I couldn't get the car to start , cranking but no start. Had to get towed home.

Check engine light came on, 14, 22, 32. 41, 45. Silly ecu 5 codes abruptly
I did all basic diagnostics, but couldnt find anything.
luckily I have so many spare parts so I can swap critical sensors. I ended up getting the car to start again by swapping the MAF. Also all check engine lights gone.
The car drove fine for about 5min. Before having problems again. This time the car didn't die but wouldn't take any throttle. Idle OK but not able to take any boost.

One thing I noted is I watched one of the intercooler couplers collapsing when revving . I thought for sure this was my problem. I swapped out the coupling and it seemed fixed but the problems came back quick.

I started thinking I should swap my plugs incase they fouled out or something from the MAF problem. Although they looked fine I put new ones in.

Sure as shit the car started running great. For about two days, then it won't take any boost again. Idels OK but won't take throttle. No check engine lights.
I turned the car off, back on, and back to good. WTF is happening? Is my ECU taking a shit? Intermittent MAF problems?

As always any and all help is greatly appreciated. Thanks in advance.

[dankberries]

What causes the car to run/idle but not be able to drive? I got fuel and spark but seems not in the right order . Timing is good. Cam/crank? Usually if its cam/crank the car won't run. Same with MAF.

Checked grounds. Put new gas in it. Unplugged and plugged all sensors to see for fluctuations. I wiggled on wires seeking a short.

I haven't tried new plug wires , but I would be mind blown if they went already at less than 10k.

If it where an intermittent sensor wiring issue, I would think the check engine light would go off and on or something.
Maybe the fuel pump is intermittent and that's why it doesn't throw codes.

Is it common for these ECU's to have.problems? I know some early 90's cars had lots of problems with frying capacitors.

Edit:
had the car stall out 3 times on my drive home. Each time the car would suddenly become un responsive to throttle, It seems to happen when I enter 5-10psi, then like a switch was flipped, completely fall on its face. I pull over, it idles fine. Just won't rev for shit, I turn the key off, wait 5sec., turn key on, start, and voila car is working again. Of course no codes during any of this.
I'm leaning towards a fueling issue, perhaps my 1yr old wallyBro took a deuce, I dunno.. maybe the ECU took a deuce...something is deucing all over the place dammit.

[rallyak]

Just a shot in the dark but is the fuel filter plugged?