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View Full Version : sr20det blacktop sputter *clarification*


shanez
12-06-2014, 09:56 PM
Ok been searching all over reading a bunch of the infamous sputtering threads, but I just want to clarify my thought process and see if you guys are thinkin the same.
Okay I started having a slight sputter/stutter about a month ago on my sr ONLY at partial crusing. Initially I figured TPS was going out. So did the whole testing process. Yup it was bad. So replaced and set to .5v with a brand new sensor. Made my car run considerably better however once my car is warms up I get an annoying sputter while cruising. No problems under 3/4 throttle or WOT or boost. Just at crusing light throttle. So I unplugged my oxygen sensor and boom. Ran really good and had no miss or sputter, but didn't quite have the same response etc (figured since O2 helps with timing etc) bout a brand new oem oxygen sensor and plugged it in. Sounds better at idle and when starting to drive. Then omce warmed up gets right back to that partial sputter.
Have replaced the following
Knock sensor
Oxygen sensor
Tps
Iacv gasket
Boost leak test shows no leaks

I'm wonderimg if its not just the cts now since its only when its warm

shanez
12-08-2014, 12:37 PM
update

Got a new wideband sensor and CTS today. Come to find out it runs great at idle steady at 850 (that's where i set it), but after cruising around for about 5 mins it all the sudden drops full lean --- when cruising in vaccum. Doesnt show anything until i creep into boost, then the a/f is good!
I'm kinda pissed and guessing it's gonna be a wiring issue or something.

On a side note, it does have a slight miss when sitting in neutral and holding the revs... ?

Marco,s14..
12-08-2014, 02:13 PM
Check your air filter. I ran my car with out it for 1 day and car wold act same as yours.

shanez
12-08-2014, 03:01 PM
Marco it's got a brand new filter on it. I'm really leaning toward wiring issue. not sure what exactly the issue is lol, but I feel like it is. I'm going to get a new harness in the next couple days and see if the fixes it. Kinda weird though that it only does it if i plug the oxygen sensor in, even with a new sensor.....wtf