Grumblerton

I'll be removing them tomorrow after work and resetting the ECU. It definitely seems like the inner flaps were causing some boost issues. Driving today the AP was reading 16.5 PSI peak which is only a half pound below target. Still some stumbling present. I'll see how it works tomorrow and if still no luck I'll have to order a new coupler. Any suggestions?. A quick search only showed cobb, perrin, and avo options. Nothing generic seemed to pop up.

I cut away the damaged parts of the inner flap and then reattached it and made sure to really tighten it. Problem has noticeably improved from a harsh cut out to a minor stumble in boost now.

Pulled the coupler today. The little inner flap had torn and pushed out on the TB side. Reattached it with everything clamped tight and going to see what happens. If I need to replace the boot will the Cobb silicone one work?

Haven’t done plugs, no flashing CEL for a misfire during the bucking. It’s usually at 4K rpm in any gear but it’s most apparent in third. I haven’t gotten a single code to pull yet despite it happening multiple times.

So update, drove home with the 93 map. Not a single problem at all. Got home and had the car idling while I loaded it for a trip to the house I recently bought. Issue started again after leaving. I’m going to try and look through all the vac lines and especially any of the intake piping this weekend. Just taking it easy on the car from now until I can get it on ramps and look underneath. Could it be a turbo issue or a bpv issue as well? I’m seriously at a loss of what could be causing it. Today’s temps were 42 at 5:30 am and 65 at 3:00 pm. I’m in southeast PA.

It’s basically a hard bucking and feels like the motor cuts out for half a second and continues. The tach will bounce but still climb. Problem is only an apparent at WOT or close to it. If I just push 10 pounds through it by laying off the pedal a bit then there’s no problem at all.

So quick update while I’m on break at work. Reflashed the ECU this morning with the original 93 map and the stutter was less pronounced. I’m going to try the 91 map on the drive home and see what happens. I can try and get a couple good data logs comparing what the car is doing between 91, 93, and maybe even stock. No CEL or even a flashing CEL during the stumbling. MAF will be pulled and cleaned thoroughly again. Did a preliminary look at the vacuum lines I could see and everything seemed secure and still flexible. Could it be plugs? Still not hitting target boost of 17 psi and averaging around 15.6-16.4 peak. I looked at the intake and the charge pipe boots and saw no cracks and everything was butted up to the metal end fully.

I recently got gas but it has been a consistent problem through 2 tanks but I have filled up from the same chain at stores within a couple miles of each other. I'll try stepping back to a 91 tune and seeing if that might be the problem. Something tells me I might have gotten some bad gas. MAF will get pulled and cleaned tomorrow. Thanks a ton so far, hopefully I'll have good news to report.

I have a log in second from close to a stop to when it starts cutting. I didn't want to try and push the car through and potentially damage anything. Only recent change was a DW300 installed when this issue started because I assumed it was a fueling issue.

datalog2.csv

Hey first post but long time lurker. Recently my car will pull absolutely fine but going WOT around 4k will cause it to suddenly cut out almost like a heavy knock. 100k on the car with an OTS 93 tune. Other than that it's completely stock. I have a data log I hope will help since I'm not totally sure what I'm looking at.

datalog4.csv