Carb or piston problems?
Thread Starter
Instructor
Joined: Nov 2006
Posts: 119
Likes: 2
From: Baton Rouge La
Carb or piston problems?
While driving on the interstate, I began hearing popping noises, which didn't sound to me like backfiring, but they could have been. I pulled over and took off the air cleaner to find what appeared to be oil bubbling in the front two openings of the carb (I have a 4 barrel holly with electric choke by the way). I took off the carb and replaced the gaskets underneath, cleaned it out well and put it back together. Tried to start it up and was succesful but would kill after a few seconds. Didn't see any oil in the carb. Opened the oil cap to look for blue smoke (as I was advised by a friend) but saw no smoke of any kind. When the car was revved up to try to keep it running, small flames actually jumped out of the front of the carb.
A friend told me if I have oil leaking into the carb, I could have a bad ring on a piston. Could this be the case here?
Other notables: the car was running fine until today, back and forth between Baton Rouge and New Orleans (about 65 miles) once a week. Timed properly. Fuel/air mixture appeared okay but I did not set it once I put the carb back on, as I couldn't get the car to stay running. Also, I don't know what I'm doing, so any simple suggestions will help.
Thanks for any help
A friend told me if I have oil leaking into the carb, I could have a bad ring on a piston. Could this be the case here?
Other notables: the car was running fine until today, back and forth between Baton Rouge and New Orleans (about 65 miles) once a week. Timed properly. Fuel/air mixture appeared okay but I did not set it once I put the carb back on, as I couldn't get the car to stay running. Also, I don't know what I'm doing, so any simple suggestions will help.
Thanks for any help
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
While driving on the interstate, I began hearing popping noises, which didn't sound to me like backfiring, but they could have been. I pulled over and took off the air cleaner to find what appeared to be oil bubbling in the front two openings of the carb (I have a 4 barrel holly with electric choke by the way). I took off the carb and replaced the gaskets underneath, cleaned it out well and put it back together. Tried to start it up and was succesful but would kill after a few seconds. Didn't see any oil in the carb. Opened the oil cap to look for blue smoke (as I was advised by a friend) but saw no smoke of any kind. When the car was revved up to try to keep it running, small flames actually jumped out of the front of the carb.
A friend told me if I have oil leaking into the carb, I could have a bad ring on a piston. Could this be the case here?
Other notables: the car was running fine until today, back and forth between Baton Rouge and New Orleans (about 65 miles) once a week. Timed properly. Fuel/air mixture appeared okay but I did not set it once I put the carb back on, as I couldn't get the car to stay running. Also, I don't know what I'm doing, so any simple suggestions will help.
Thanks for any help
A friend told me if I have oil leaking into the carb, I could have a bad ring on a piston. Could this be the case here?
Other notables: the car was running fine until today, back and forth between Baton Rouge and New Orleans (about 65 miles) once a week. Timed properly. Fuel/air mixture appeared okay but I did not set it once I put the carb back on, as I couldn't get the car to stay running. Also, I don't know what I'm doing, so any simple suggestions will help.
Thanks for any help
Thread Starter
Instructor
Joined: Nov 2006
Posts: 119
Likes: 2
From: Baton Rouge La
Yes I do. And I noticed oil on the tip of the connector coming out of the valve cover when I was unhooking the carb now that you mention it. Any ideas what could cause this/ how it could be fixed?
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
The PCV has a ball in it when you pull it out of the valve cover if its not sticking when you shake it you should hear a rattle, thats the ball moving around in it. they are very cheap in cost just go to the auto store buy a new one. clean up any oil in the hose going up to the air cleaner and the base of the air cleaner.
Last edited by Little Mouse; Apr 15, 2008 at 04:03 AM.
Drifting
Joined: Dec 2002
Posts: 1,946
Likes: 28
From: Long Beach CA
The first thing I'd do is throw a timing light on it and see where that sits. The holddown may have come loose and the distributor has moved slightly, throwing off the timing. Also a possibility is that the timing chain jumped a tooth, throwing off the cam and ignition timing. I'm assuming you've already checked for vacuum leaks.
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
While driving on the interstate, I began hearing popping noises, which didn't sound to me like backfiring, but they could have been. I pulled over and took off the air cleaner to find what appeared to be oil bubbling in the front two openings of the carb (I have a 4 barrel holly with electric choke by the way). I took off the carb and replaced the gaskets underneath, cleaned it out well and put it back together. Tried to start it up and was succesful but would kill after a few seconds. Didn't see any oil in the carb. Opened the oil cap to look for blue smoke (as I was advised by a friend) but saw no smoke of any kind. When the car was revved up to try to keep it running, small flames actually jumped out of the front of the carb.
A friend told me if I have oil leaking into the carb, I could have a bad ring on a piston. Could this be the case here?
Other notables: the car was running fine until today, back and forth between Baton Rouge and New Orleans (about 65 miles) once a week. Timed properly. Fuel/air mixture appeared okay but I did not set it once I put the carb back on, as I couldn't get the car to stay running. Also, I don't know what I'm doing, so any simple suggestions will help.
Thanks for any help
A friend told me if I have oil leaking into the carb, I could have a bad ring on a piston. Could this be the case here?
Other notables: the car was running fine until today, back and forth between Baton Rouge and New Orleans (about 65 miles) once a week. Timed properly. Fuel/air mixture appeared okay but I did not set it once I put the carb back on, as I couldn't get the car to stay running. Also, I don't know what I'm doing, so any simple suggestions will help.
Thanks for any help
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
There should be a baffle in the valve cover under the PCV valve. That is to keep liquid oil from splashing up on the valve and getting sucked into it. If you don't have a baffle there, ingested raw oil is likely your problem. See if you can rig up a baffle [of sorts] out of a scrap of sheet metal epoxied (or pop-riveted) to the cover. If that solves the problem, leave "as is", or go buy a good set of covers with baffles.
