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I’ve had the same issue after installing Stillen gen 3 intakes, decided not to put the cover back on, forgot to put the screw on and car was running rough and a loud hissing noise was there, screwed a screw in there, I’m sure I tightened it (obviously not knowing it could crack) and it went back to normal, drove the car for a few days and it starting misfiring lightly after coming off the highway. The misfire has gotten worse, so I’m going to change sparks, coils, o2 sensors, a new catalyst ( mine got torn apart because of the misfires I believe ), clean MAF and throttle body. Hopefully that’ll fix it, if it doesn’t then I’ll be sure it’s coming from the plenum and I can use that as an exuse to switch to Z1 ported plenum 😍
I might need a tune because I have the Stillen intakes and a full Magnaflow Catback. ( This could also fix)
Will update this post when I get the new parts in!
Another inexperienced lube tech strikes again. Instead of hand torquing the bolt down, they used the good ol’ trusty 3/8in impact gun and gave it 3 chuga chuga’s. I see it all the time at MB.
I am new to this forum, and this is my first post. I am glad to know everyone, and receive help from the Infiniti gurus.
My car is the 2013 infiniti g37x coupe. Today I removed the engine cover to clean the plenum.
I am pretty sure everyone know that there are 5 screws to hold the engine cover down. The moment I removed the center screw, suddenly I heard the hissing noise came out from that screw hole, and when I touched it, it seems like a vacuum leak, and idle rpm dropped to 500rpm.
I wonder if it is normal that Nissan/infiniti designed their plenum with center screw hole created vacuum?
to note that the moment I put the screw back in, no more hissing noise, and also the idle rpm went back to normal.
I hope I can get help since I tried to search on the internet and found no luck thus far.
Thank you in advance
(the attached photo is just a random Infiniti/Nissan plenum I found on the web, and put a red arrow in to show everyone where the screw hole located)
