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SN95 Cobras
chirping noise
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<blockquote data-quote="Mojo88" data-source="post: 16272778" data-attributes="member: 184279"><p>So, here's my story which I NEVER thought would be relevant to anyone else.</p><p></p><p>A few years back I had a supercharged Pontiac Bonneville SSei (3.8L engine). I had to replace the supercharger with a rebuilt one, and whilst doing so I installed new gaskets between the intake and the S/C. Like an idiot, I used a fair (err, <strong><u>lots</u></strong> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite10" alt=":oops:" title="Oops! :oops:" loading="lazy" data-shortname=":oops:" /> ) amount of silicone sealant around all the openings, figuring I'd make sure I only had to do the job once.</p><p></p><p>Well, everything seemed fine and then I started noticing these loud chirping noises. I was like ... WTF is that? This continued for a few weeks, the engine ran great and I wasn't too stressed, but I was puzzled. I took it to Pontiac dealer and they clearly heard it but had zero clue as to the cause.</p><p></p><p>Then I noticed the noise went away, and I though I was good-to-go, but upon opening hood I notice the dipstick is sticking out a little bit. So I reinstall the dipstick and the chirping starts right away. Then I figured it had to be PCV related as there was a PCV outlet port on the S/C. I took the fitting off and after peering down inside, I could see that my wonderful silicone job had inadvertently plugged the PCV port. I scraped out the port, reinstalled the fitting and the chirping was all gone. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>So, my guess (a good one, in this case) is your PCV system is somehow obstructed. I would use 'Occam's Razor' approach and replace the PCV valve first.</p></blockquote><p></p>
[QUOTE="Mojo88, post: 16272778, member: 184279"] So, here's my story which I NEVER thought would be relevant to anyone else. A few years back I had a supercharged Pontiac Bonneville SSei (3.8L engine). I had to replace the supercharger with a rebuilt one, and whilst doing so I installed new gaskets between the intake and the S/C. Like an idiot, I used a fair (err, [b][U]lots[/U][/b] :oops: ) amount of silicone sealant around all the openings, figuring I'd make sure I only had to do the job once. Well, everything seemed fine and then I started noticing these loud chirping noises. I was like ... WTF is that? This continued for a few weeks, the engine ran great and I wasn't too stressed, but I was puzzled. I took it to Pontiac dealer and they clearly heard it but had zero clue as to the cause. Then I noticed the noise went away, and I though I was good-to-go, but upon opening hood I notice the dipstick is sticking out a little bit. So I reinstall the dipstick and the chirping starts right away. Then I figured it had to be PCV related as there was a PCV outlet port on the S/C. I took the fitting off and after peering down inside, I could see that my wonderful silicone job had inadvertently plugged the PCV port. I scraped out the port, reinstalled the fitting and the chirping was all gone. :) So, my guess (a good one, in this case) is your PCV system is somehow obstructed. I would use 'Occam's Razor' approach and replace the PCV valve first. [/QUOTE]
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