Oh no what’s that sound?, 1973 1.7L |
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Oh no what’s that sound?, 1973 1.7L |
MiniStevieG |
Feb 5 2019, 07:42 PM
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#1
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Member Group: Members Posts: 179 Joined: 25-January 19 From: Dallas, TX Member No.: 22,827 Region Association: Southwest Region |
Was out on a drive and accelerating then all of a sudden boom! Crazy loud exhaust sound starts coming from my 1.7L. Sounded to me like the muffler fell off but I’ve given it a once over and don’t see anything yet. Wanted to post this video to see f anyone has any feedback on what I might be dealing with here. Afraid this may be the 1st big problem I’m dealing with here.
Here’s a link to the video I uploaded. https://m.youtube.com/watch?v=nXRry73OB4w&a...eature=youtu.be Cheers!! |
sithot |
Feb 5 2019, 07:48 PM
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#2
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Member Group: Members Posts: 446 Joined: 25-October 06 From: Virginia Member No.: 7,090 Region Association: None |
Was out on a drive and accelerating then all of a sudden boom! Crazy loud exhaust sound starts coming from my 1.7L. Sounded to me like the muffler fell off but I’ve given it a once over and don’t see anything yet. Wanted to post this video to see f anyone has any feedback on what I might be dealing with here. Afraid this may be the 1st big problem I’m dealing with here. Here’s a link to the video I uploaded. https://m.youtube.com/watch?v=nXRry73OB4w&a...eature=youtu.be Cheers!! You have blown out a spark plug. It happens. |
Larmo63 |
Feb 5 2019, 07:53 PM
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#3
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Advanced Member Group: Members Posts: 4,264 Joined: 3-March 14 From: San Clemente, Ca Member No.: 17,068 Region Association: Southern California |
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MiniStevieG |
Feb 5 2019, 07:56 PM
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#4
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Member Group: Members Posts: 179 Joined: 25-January 19 From: Dallas, TX Member No.: 22,827 Region Association: Southwest Region |
How do yo know? |
Rand |
Feb 5 2019, 08:02 PM
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#5
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Please check smog valve hole first. Happened to me once.The place where the stupid smog pump got plumbed into the head. I got lucky and just needed to plug it (there are articles here on how to do that). I hope yours isn't catastrophic. Best of luck. (IMG:style_emoticons/default/beerchug.gif)
Not on a '73 though. (IMG:style_emoticons/default/sad.gif) Is it the stock engine? |
MiniStevieG |
Feb 5 2019, 08:12 PM
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#6
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Member Group: Members Posts: 179 Joined: 25-January 19 From: Dallas, TX Member No.: 22,827 Region Association: Southwest Region |
Please check smog valve hole first. Happened to me once.The place where the stupid smog pump got plumbed into the head. I got lucky and just needed to plug it (there are articles here on how to do that). I hope yours isn't catastrophic. Best of luck. (IMG:style_emoticons/default/beerchug.gif) Not on a '73 though. (IMG:style_emoticons/default/sad.gif) Is it the stock engine? Yes it’s stock for the most part. Just a carb swap and that’s it |
sb914 |
Feb 5 2019, 08:17 PM
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#7
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Surf Guru Group: Members Posts: 4,315 Joined: 25-November 12 From: Brookings,Oregon Member No.: 15,191 Region Association: Southern California |
I bet you blew a plug as well. Are all the spark plugs still in ?
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Rand |
Feb 5 2019, 08:18 PM
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#8
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Please check smog valve hole first. Happened to me once.The place where the stupid smog pump got plumbed into the head. I got lucky and just needed to plug it (there are articles here on how to do that). I hope yours isn't catastrophic. Best of luck. (IMG:style_emoticons/default/beerchug.gif) Not on a '73 though. (IMG:style_emoticons/default/sad.gif) Is it the stock engine? Yes it’s stock for the most part. Just a carb swap and that’s it Had to check. Hopeful thinking. |
Rand |
Feb 5 2019, 08:22 PM
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#9
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Was the "boom" catastrophic as in she's done instastop, or did it try to sorta run before you shut it off? Is it leaking oil? Drain the oil and have a look at the particles.
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MiniStevieG |
Feb 5 2019, 08:26 PM
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#10
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Member Group: Members Posts: 179 Joined: 25-January 19 From: Dallas, TX Member No.: 22,827 Region Association: Southwest Region |
Please check smog valve hole first. Happened to me once.The place where the stupid smog pump got plumbed into the head. I got lucky and just needed to plug it (there are articles here on how to do that). I hope yours isn't catastrophic. Best of luck. (IMG:style_emoticons/default/beerchug.gif) Not on a '73 though. (IMG:style_emoticons/default/sad.gif) Is it the stock engine? Yes it’s stock for the most part. Just a carb swap and that’s it Had to check. Hopeful thinking. Yeah it doesn’t sound catastrophic but I’m a new to the 914 world so hopefully it is just a plug. I’ll be investigating here after I finish this margarita. Was planning to replace the 1.7L with a 2.0 but not this soon ha!!! |
Chris H. |
Feb 5 2019, 08:27 PM
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#11
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Senior Member Group: Members Posts: 4,032 Joined: 2-January 03 From: Chicago 'burbs Member No.: 73 Region Association: Upper MidWest |
Yeah it's pretty easy to determine if it's a plug. The plug will just be hanging there or laying there free, no longer attached to the engine. Sure sounds like it from the video.
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MiniStevieG |
Feb 5 2019, 08:30 PM
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#12
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Member Group: Members Posts: 179 Joined: 25-January 19 From: Dallas, TX Member No.: 22,827 Region Association: Southwest Region |
Was the "boom" catastrophic as in she's done instastop, or did it try to run before you shut it off? Is it leaking oil? Drain the oil and have a look at the particles. It appeared to have some loss of power but continued to run just fine until I got to my house. It was just crazy loud. Thought the exhaust had blown out since I was accelerating but still at a very low rpm. I wasn’t pushing it that hard at all. I was just down the street and only had to drive it for 30secs before I was back at the house. No apparent major oil leak detected when I got home. Tried fifeing it back up after a few minutes and ran it for 10sec with no issues other than the fact it was loud as hell. Cheers!! |
Rand |
Feb 5 2019, 08:32 PM
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#13
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Yeah it's pretty easy to determine if it's a plug. The plug will just be hanging there or laying there free, no longer attached to the engine. Sure sounds like it from the video. Let's hope it's that. Thought we covered the idea, but hey... Share pics of your plugs. That will solve more than one mystery. |
Rand |
Feb 5 2019, 08:37 PM
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#14
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
The sound out a ratty exhaust is completely different than the popping out of an engine's head. Dammit I can't fix you. You have learning to do. But you are in the right place for that. (IMG:style_emoticons/default/smile.gif)
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MiniStevieG |
Feb 5 2019, 09:01 PM
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#15
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Member Group: Members Posts: 179 Joined: 25-January 19 From: Dallas, TX Member No.: 22,827 Region Association: Southwest Region |
Went and picked up the 914 starter kit. Couldn’t help myself. Let’s see what the heck’s going on here.
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MiniStevieG |
Feb 5 2019, 09:21 PM
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#16
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Member Group: Members Posts: 179 Joined: 25-January 19 From: Dallas, TX Member No.: 22,827 Region Association: Southwest Region |
Yeah it's pretty easy to determine if it's a plug. The plug will just be hanging there or laying there free, no longer attached to the engine. Sure sounds like it from the video. Let's hope it's that. Thought we covered the idea, but hey... Share pics of your plugs. That will solve more than one mystery. Well y’all are amazing! Here ya go. Blown plug (IMG:style_emoticons/default/cheer.gif) Now back to business and thank you everyone. |
MiniStevieG |
Feb 5 2019, 09:36 PM
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#17
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Member Group: Members Posts: 179 Joined: 25-January 19 From: Dallas, TX Member No.: 22,827 Region Association: Southwest Region |
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mepstein |
Feb 5 2019, 09:40 PM
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#18
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914-6 GT in waiting Group: Members Posts: 19,313 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
50 year old aluminum heads. They don't last forever.
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MiniStevieG |
Feb 5 2019, 09:42 PM
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#19
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Member Group: Members Posts: 179 Joined: 25-January 19 From: Dallas, TX Member No.: 22,827 Region Association: Southwest Region |
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MarkV |
Feb 5 2019, 09:52 PM
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#20
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Fear the Jack Stands Group: Members Posts: 1,493 Joined: 15-January 03 From: Sunny Tucson, AZ Member No.: 154 Region Association: None |
Not all that common but it happens. Hopefully the threads are intact. Autolite plugs are not the preferred plug for a 914. That plug looks fairly new maybe it was never properly tightened. If the threads are damaged you can install a thread repair kit from Helicoil or Time Cert.
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