So; every once in a blue moon my Z would idle rough and stumble upon acceleration in low RPMs. Around 3k it would clear up and run smoothly the rest of my drive. Just last week it started happening just about every other start up. Warm or not. it felt as if it were running on 4 or even 3 cylinders. Very rough and practically NO power! The car died on me at a red light. No sputter or stall just cut power and i didnt notice. I pushed it aside and got a ride to work later that night i went back to the Z and she started up and drove fine (no stumble) all the way home. Garaged her and Popped the hood later that night, fixed multiple vacuum lines that were BROKEN! and some weathered looking fuel lines as well just for good measure. Cleaned the air intake, reset the ECU and she ran like a beast from then on out. Idle was smooth and boost gauge works again. No stumble at any rpm or anything.
Now here's where it turned on me. I was driving some fun back roads the other night (boosting quite a bit too) when the engine started to stumble around 4k and boost was cutting in and out. Doing about 45mph and 7Lbs (stock gauge) it would boost and accelerate then cut boost and slow down. Felt very similar to topping out at max speed. This immediately Caught my attention, and driving up a Steep hill on heavy boost, the car lost boost altogether and ran N/a to the top of the hill. This makes me assume it's a boost leak. So I drove Under 3k to avoid any boost, to my work. I cooled the car for 5 mins or so before shutting it down. Hung out for 30 mins or so before heading home.
Here's the kicker. Car started and drove fine the whole way home (avoiding boost mostly) but right down the street from my house, at a stop, my car died altogeher like the week before. I checked all the vacuum lines and intake pipes. Couldn't find any thing.. The car cranks and turns over but won't start. Tried jumping her and to no avail.
Known problems:
ECU reads code 34 DET sensor
Blown seal on turbo or maybe oil line. Hasn't boosted like when I first got her (this happened long before hand)
Misfire in unknown cylinder. Ticking. (did coil pack test but nothing!)
I ran a multimeter through most components and everything checks out.
Hope this makes sense, as I'm typing this through my phone it's hard to review everything. But if anyone has any insight or ideas as to what I should try/test please help me out. I am a novice to this 300zx but I need to get her running. All and any help is greatly appreciated. Once again sorry for greeting you all on a bad note! But I need help and DON'T want to take her to a shop.
Thank you in advance!
