carb popping
Thread Starter
2nd Gear
Joined: Nov 2004
Posts: 2
Likes: 0
carb popping
Hey Guys,
First post and i could use some help. My father has a 69 427 390hp. Has been sitting since last winter. When he first tried to start it up this summer had a loud popping noise and lots of smoke. Tried again last night, found the noise. Coming through the carburetor. Consistant popping. Ran fine last year until put away. Any ideas? Collapsed lifter?? Thanks in advance.
First post and i could use some help. My father has a 69 427 390hp. Has been sitting since last winter. When he first tried to start it up this summer had a loud popping noise and lots of smoke. Tried again last night, found the noise. Coming through the carburetor. Consistant popping. Ran fine last year until put away. Any ideas? Collapsed lifter?? Thanks in advance.
Drifting
Joined: Mar 2005
Posts: 1,806
Likes: 3
From: Burlington WI
Just a thought...
Try pulling one plug wire off at a time to narrow down which cylinder it is coming from.
Then run a compression test.
I may be wrong but it sounds, from what you described, like a valve isnt closing completely.
Or...
Pull the valve covers and watch the rockers and valves as you roll it over.
You might want to disconnect the coil wire or you will have oil all over.
Then run a compression test.
I may be wrong but it sounds, from what you described, like a valve isnt closing completely.
Or...
Pull the valve covers and watch the rockers and valves as you roll it over.
You might want to disconnect the coil wire or you will have oil all over.
Melting Slicks
Joined: Nov 2003
Posts: 2,668
Likes: 118
From: St. Charles Mo
CI 5 & 8 Veteran
Originally Posted by fl_rider
Try pulling one plug wire off at a time to narrow down which cylinder it is coming from.
Then run a compression test.
I may be wrong but it sounds, from what you described, like a valve isnt closing completely.
Or...
Pull the valve covers and watch the rockers and valves as you roll it over.
You might want to disconnect the coil wire or you will have oil all over.
Then run a compression test.
I may be wrong but it sounds, from what you described, like a valve isnt closing completely.
Or...
Pull the valve covers and watch the rockers and valves as you roll it over.
You might want to disconnect the coil wire or you will have oil all over.
The BB 427's and 454's are notorius for broken valve springs. That would cause your symtom. Just rolling it over at low rpm might not show an obvious problem. Do a thourgh inspection of all valve springs, both the inner and outer..If you are really unlucky, you could have a worn off cam lobe, but that should be real obvious
Good luck
