I'm thinking , plugs and an ify wiring harness, but fix the harness first and test that then the plugs just to isolate the root cause.

 

Agreed... Although I've already received my ACDelco Iridium plugs, gapped and ready to go (I'll still confirm with a feeler!)

Now... Where can I get JUST the harness?! I thought ZZP had them but it's in a kit with the sensor. The sensor only has 20k on it. It's wasteful to buy the whole thing :/

 

How else would the dyno measure power?



I take your meaning, though. No, they had good positive contact with the dyno rollers and were not slipping.

 

Perhaps correctly solder the harness. With proper shrink tube and tape.

 

I'll be inspecting it this weekend. We'll see how it held up.

With nearly 90k there are a lot of little things that need addressing (although consider it runs in our salty Northeast it's holding up far better than I ever expected from an 'Murican make).

 

Plugs seem to be fine, my cabling is actually in excellent shape so I am no longer concerned there. I sealed it quite nicely the first time.

I am talking to ZZP about some options. They have been extremely helpful and their phone response is great. I made a bad call going with catless (not Hahn's fault by any means) and will be replacing the DP with a catted unit at the least. Depending on condition, I'll put the catless one on a classified ad. But that's for another thread.

In the meantime I wait for the next infusion of tunes/parts. The "tune off" (start state of the car; TC on, Comp mode off) seems to run without the "boost hunting" so it's looking more like a Trifecta thing (albeit at a lower boost peak, effectively "GMS1"). I'm not meaning to bad mouth them, they have reviewed two data logs after installation, but tunes are only slightly more expensive than dyno time, so it's a minor expense in the grand scheme.

On to the next step...

 

Went to ZZP and got a "new" ECU. Also got their intake and catted DP (I should have gone catted in the first place). At first things were great, but after a week I'm getting rich conditions (P2178) and the end of last week it actually went into limp mode and wouldn't boost at all (side note: the 2.0 without a turbo is pretty boring!). I cleared the codes, cleaned the heck out of the MAF with MAF cleaner (specifically) and while it never went in to limp mode, I'm still getting the rich code and while the boost comes on almost immediately, it's topping off at 20# just about even whereas week 1 it was pegging at 25.5 and holding very consistently.

I don't know what to do with the darn thing. Even though the sensors all looked good I am replacing them all. I know the K&N oil can bung up the works, but after the cleaning I gave the MAF, I can't imagine that was an issue today.

 

Imagine all the possibilities! The MAF and the plumbing could be oiled up! Again!

 

Received two new MAPs with the proper adapter cabling; replaced them and used the adapters. Although my cob-job wiring actually appeared to be in great condition so I wasn't optimistic.

I received a replacement MAF from an Amazon reseller and the thing came damaged: one of the sensor wires inside the aperture was snapped and twisted! The more distant one, besides. I figure it was sitting in a parts bin with some small, skinny bits and pieces and something got caught on it. In any case, still have stock MAF.

No change in behavior. I am sending the MAF back tomorrow and getting another. Hopefully this week.

The behavior is a pattern, though: drives fine for ~half dozen starts, with full power (25.5 PSI hard stop by 3000). Sometime shortly thereafter I get the rich idle error code (times two) and subsequent ignition start ups aren't snappy, more like a slow wheezy. Driving does not seem to be much affected except maybe a little air/fuel confusion on a quick power-off of the throttle. Finally I get a MAF performance / oxygen code and boost is reduced or cut. If I clear the codes the cycle starts over.

I have not been getting on it much since this pattern has begun. Oddly, recorded mileage has INCREASED...

So confused!

 

Got it at my trusted shop (if not a "performance expert") for state inspection and to check out a suspension clunk I'm getting in the rear (the front were the tower bushings last time). Also installing a new catted DP from ZZP, wondering if the different sensor bung on the Hahn unit is messing up the O2 reading causing the odd behavior. Crossing my fingers... I'm loving it... When it's running right!