Nissan 370Z Forum - View Single Post

TopgunZ · 04-28-2014, 11:59 AM

Well my build has tested me. I had less problems twin charging my 350z..lol.

Upon first start up I had E85 literally pouring out of my exhaust. After figuring out it was my injector on cylinder 2 that was stuck wide open and I had them cleaned. Then a ticking/tapping noise appeared. The noise can also be heard from under the car rather well like its coming from the intake filter.

I had a buddy come listen to it and we both agreed it sounded like a bent valve. We suspected my ID1000 dumped so much fuel that it hydrolocked that cylinder and tried to compress the fuel, which doesn't compress.

I went and purchased a leak down tester and all cylinders tested under 10% loss. So it isn't a bent valve. It doesn't sound at all like a knock so I'm not concerned about it being a rod. The sound is hard to pinpoint as it comes from the entire plenum.

I first used a paper towel roll to listen around the bay but couldn't figure it out. Then bought a mechanics stethoscope and still cant figure it out.

I am thinking it may be an oiling issue at this point and may be a lifter or all lifters not getting properly lubricated.

Thinking this because I had to drain all 7 quarts of my full synthetic oil since there was fuel in it due to the cylinder filling with it then leaking past the rings into the pan. The second time I filled it "when the noise started" I only put 4 quarts in, in case the injector was still bad I didn't want to ruin another full 7 quarts. But maybe by only putting 4 quarts in, it wasn't able to properly lubricate everything. I now have 7 quarts in but the noise is still there.

Ive also heard that if a damper goes bad it can make this noise.

I think the noise has calmed down a bit but now after listening to everything for so long I don't know what I am hearing anymore. Maybe this sound was always there but with the engine cover off and the hood closed always when running it was just muffled.

Also, my car idles really rough from the base map and this may be a totally different situation since I had a new base map made for my setup vs. the original map everyone else has.

Any suggestions?

04-28-2014, 11:59 AM	#1329 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6834	Well my build has tested me. I had less problems twin charging my 350z..lol. Upon first start up I had E85 literally pouring out of my exhaust. After figuring out it was my injector on cylinder 2 that was stuck wide open and I had them cleaned. Then a ticking/tapping noise appeared. The noise can also be heard from under the car rather well like its coming from the intake filter. I had a buddy come listen to it and we both agreed it sounded like a bent valve. We suspected my ID1000 dumped so much fuel that it hydrolocked that cylinder and tried to compress the fuel, which doesn't compress. I went and purchased a leak down tester and all cylinders tested under 10% loss. So it isn't a bent valve. It doesn't sound at all like a knock so I'm not concerned about it being a rod. The sound is hard to pinpoint as it comes from the entire plenum. I first used a paper towel roll to listen around the bay but couldn't figure it out. Then bought a mechanics stethoscope and still cant figure it out. I am thinking it may be an oiling issue at this point and may be a lifter or all lifters not getting properly lubricated. Thinking this because I had to drain all 7 quarts of my full synthetic oil since there was fuel in it due to the cylinder filling with it then leaking past the rings into the pan. The second time I filled it "when the noise started" I only put 4 quarts in, in case the injector was still bad I didn't want to ruin another full 7 quarts. But maybe by only putting 4 quarts in, it wasn't able to properly lubricate everything. I now have 7 quarts in but the noise is still there. Ive also heard that if a damper goes bad it can make this noise. I think the noise has calmed down a bit but now after listening to everything for so long I don't know what I am hearing anymore. Maybe this sound was always there but with the engine cover off and the hood closed always when running it was just muffled. Also, my car idles really rough from the base map and this may be a totally different situation since I had a new base map made for my setup vs. the original map everyone else has. Any suggestions? __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM Last edited by TopgunZ; 04-28-2014 at 12:04 PM.