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-   -   Engine running very sluggish. 1.8 VVT Turbo (https://www.miataturbo.net/general-miata-chat-9/engine-running-very-sluggish-1-8-vvt-turbo-95002/)

Blayton 10-27-2017 04:20 PM

Engine running very sluggish. 1.8 VVT Turbo
 
Okay, so last week I drove my car and it ran completely fine. I turned it on yesterday and it ran like crap. Very sluggish running, and the weird thing is the intake sounds really loud and deep. And the turbo fluttered a lot more than normal. Any little blip of throttle would make it flutter. First I thought the turbo was seized or blown. But the car still hit boost, just seemed to review up slower. I pulled over, pulled the filter off and checked the turbo. It spun freely and has a little bit of play, but I don't think its enough to really affect performance. Next I replaced the spark plugs with NGK BRK7Es gapped to .30. It seemed to run the exact same. I drove it down the road and gave it gas and it sounded like it was spark knocking badly. I took off the timing cover and valve cover and from what I could tell, the timing seemed fine and the belt wasn't missing any teeth. After I put it back together it was misfiring really badly. I replaced the camshft position sensor, the crank sensor, and the 2-3 coilpack. Now its back to what is was when I started it yesterday. It idles fine, but when giving it any gas, it revs really slow and sluggish and the intake sounds is a lot louder than normal. At this point I'm not sure what is wrong with it. Replaced two sensors, coil pack, and plugs.

Video of it running

Any help would be greatly appreciated. Any questions just ask. Thanks guys.

Blayton 10-27-2017 09:42 PM

1 Attachment(s)
Update: Checked the timing with a timing light and fixed timing at 10° in Tunerstudio and it's dead on 10. Also just did a compression test. Has 180 on all 4 cylinders. I have no idea what it could be...
It still feels like it's misfiring, maybe not consistently though. When I rev it, it seems to not want to go over around 2500 and starts to spark knock/ping.
Here's another video of it running along with a Ignition log that I have no idea how to read:
https://photos.app.goo.gl/fsQPBdAHtCMRGEyi2

sixshooter 10-28-2017 06:26 PM

Your fuel pump has failed.

Blayton 11-01-2017 03:28 PM

Update: Got the car running a day after posting this. Turns out the car jumped timing. I guess the timing light is inaccurate if the car isn't in time (obviously......I'm an idiot). No clue how this even happened, but I pulled the timing cover, crank pulley and everything off and sure enough, it wasn't in time. I didn't even look to see which gear was out, I was in a hurry to fix it. But I re-timed everything, put everything back together, and it ran perfect! Thanks sixshooter for the suggestion, but the car was running rich, so I never assumed it would be the fuel pump.

I hate timing belts.


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