Miss Dead?
Thread Starter
Cruising
Joined: Dec 2009
Posts: 10
Likes: 0
From: Alabama
Miss Dead?
Sorry about the title, trying for something original. Okay, the other day I passed a guy that pulled out in front of me. In order to get around him quickly I punched it. Once I got around him I let off and right away the engine was running terrible. Dramatic loss of power. Backfire in the intake. Dead miss. The car has 130k. Any ideas?
Thread Starter
Cruising
Joined: Dec 2009
Posts: 10
Likes: 0
From: Alabama
Instructor
Joined: Nov 2009
Posts: 155
Likes: 2
From: Columbiana AL
Definitely the muffler bearings..
We are neighbors so I have heard the car tonight. The car has a DEAD miss and a sporatic LOUD backfire into the intake.. Especially at idle. With throttle the backfire goes away, but the dead miss is still there. The more we listened to it it seemed to me like it could have skipped time but this seemed unlikely for the miles. So, I was thinking timing, but the broken intake valve spring is sounding like a good candidate. We do not know much on the history of this car but I wonder if 1.6/1 rockers were installed onto stock springs... The car is lowered and equipped with performance exhaust..
We are neighbors so I have heard the car tonight. The car has a DEAD miss and a sporatic LOUD backfire into the intake.. Especially at idle. With throttle the backfire goes away, but the dead miss is still there. The more we listened to it it seemed to me like it could have skipped time but this seemed unlikely for the miles. So, I was thinking timing, but the broken intake valve spring is sounding like a good candidate. We do not know much on the history of this car but I wonder if 1.6/1 rockers were installed onto stock springs... The car is lowered and equipped with performance exhaust..
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Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Use a timing light to see if the timing chain has jumped. Use the timing light on every plug wire to prove each plug is firing. Look inside the distributor cap with a bright light and look for carbon tracks. If a valve/valve spring has broken, then the compression test will find that.
Race Director
Joined: Jun 2009
Posts: 10,428
Likes: 9
From: Southside of Western Norte Americano State of Confusion, ColoFornia
St. Jude '13
Just my overcautious nature.. but I would stop running the engine and pull a valve cover or two and start looking.. If its a broken valve spring and it works its way around to dropping a keeper, or just leaving the valve hanging down for a piston to smack.. your gonna have scrap metal for an engine.. if its just one cylinder then the odds of being out of time causing it to fire when an intake valve is open isn't likely..
but if it were me.. I wouldn't run it at all until I determined the problem.. dropping a valve is sort of unrecoverable..
Just something to think about
but if it were me.. I wouldn't run it at all until I determined the problem.. dropping a valve is sort of unrecoverable..
Just something to think about
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Just my overcautious nature.. but I would stop running the engine and pull a valve cover or two and start looking.. If its a broken valve spring and it works its way around to dropping a keeper, or just leaving the valve hanging down for a piston to smack.. your gonna have scrap metal for an engine.. if its just one cylinder then the odds of being out of time causing it to fire when an intake valve is open isn't likely..
but if it were me.. I wouldn't run it at all until I determined the problem.. dropping a valve is sort of unrecoverable..
Just something to think about
but if it were me.. I wouldn't run it at all until I determined the problem.. dropping a valve is sort of unrecoverable..
Just something to think about
sorry. :o
Thread Starter
Cruising
Joined: Dec 2009
Posts: 10
Likes: 0
From: Alabama
Just my overcautious nature.. but I would stop running the engine and pull a valve cover or two and start looking.. If its a broken valve spring and it works its way around to dropping a keeper, or just leaving the valve hanging down for a piston to smack.. your gonna have scrap metal for an engine.. if its just one cylinder then the odds of being out of time causing it to fire when an intake valve is open isn't likely..
but if it were me.. I wouldn't run it at all until I determined the problem.. dropping a valve is sort of unrecoverable..
Just something to think about
but if it were me.. I wouldn't run it at all until I determined the problem.. dropping a valve is sort of unrecoverable..
Just something to think about
