HELP Engine making screeching noise when start up
#1
New Member
Thread Starter
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Hi all! so I got a used motordyne plenum spacer the other day and I saw the preattached gasket was damaged so I took it off and made my own with RTV. I torqued it down to spec and waited 24 hours for it to cure and then reset my ECU and I try to start it up. When I start it up it makes an extremely loud pulsing screeching noise. Idk what it is and I am very concerned it also smells like gas when I start it up. I changed my belts not too long ago so I don’t think it’s my belt. I’m worried pls SOS
Last edited by Z33Akiko; 03-29-2022 at 04:48 PM.
#2
New Member
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Sounds like you have a bad vacuum leak somewhere, and possibly a fuel leak if you smell fuel as well. Run the car and try to pinpoint the leak, spray some WD-40 where you hear the noise and listen for an idle change, or the noise to stop, that will be the problem area.
The following users liked this post:
Z33Akiko (03-29-2022)
#3
New Member
Thread Starter
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Last edited by Z33Akiko; 04-04-2022 at 08:06 PM.
The following users liked this post:
Ponyryd (03-30-2022)
#4
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Its the spacer or the upper plenum gasket, trust me i would know
, try putting the plenum back on and torquing to 65 INCH pounds, if not replace the gasket on z1 motersports or amazon.
![Smilie](https://my350z.com/forum/images/smilies/smile.gif)
The following users liked this post:
Z33Akiko (04-04-2022)
#5
New Member
Thread Starter
![Default](https://my350z.com/forum/images/icons/icon1.gif)
#6
New Member
Thread Starter
![Default](https://my350z.com/forum/images/icons/icon1.gif)
I have the Z1 plenum spacer gasket but I wasn't sure if it was safe to use bc it’s skinnier than the spacer but when I start up my engine when it’s warm it doesn’t squeal anymore, only when it’s cold any ideas with this info?
#7
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Well it could be that the metal warps into a sealed shape at a very small level? im not sure but i mentioned this https://www.z1motorsports.com/manifo...et-p-5371.html , gasket which is different for the one on the plenum spacer but just make sure everything is tightened right
![Smilie](https://my350z.com/forum/images/smilies/smile.gif)
The following users liked this post:
Z33Akiko (04-06-2022)
Trending Topics
#8
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Well it could be that the metal warps into a sealed shape at a very small level? im not sure but i mentioned this https://www.z1motorsports.com/manifo...et-p-5371.html , gasket which is different for the one on the plenum spacer but just make sure everything is tightened right ![Smilie](https://my350z.com/forum/images/smilies/smile.gif)
![Smilie](https://my350z.com/forum/images/smilies/smile.gif)
The following users liked this post:
Z33Akiko (04-06-2022)
#9
New Member
Thread Starter
![Default](https://my350z.com/forum/images/icons/icon1.gif)
okay final update I fixed the tensioner when it was cold and then I started it and the squeak was gone so it was my belt! Thank you for the help
Thread
Thread Starter
Forum
Replies
Last Post
cipher
Maintenance & Repair
23
05-19-2009 08:23 PM