insane vack firing out of nowhere
03-16-2016, 10:38 PM
#1
Staging Lane
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Location: Michigan
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insane vack firing out of nowhere Lately I've been noticing a miss in my 96 trans am. So, with no obvious causes and a quick scan of the codes, a intermittent miss code, I began a bit of basic maintanance. After pulling and cleaning the plugs, checking all the wires (which were fine and intact), and giving everything a good once over i put it all back together; And now it has the meanest noise ive ever heard. Like a cross between a miss, a backfire, and a knock. It sounds like someone slamming a sledge hammer to the inside of the block. It is loud, deep, and shakes the car a little. If i hold the tach over 2k it seems to disappear, but as soon as i let off the gas, bam, another slam. The gnarliest back fire ive ever heard. Thought maybe clogged converters were a culprit, alas to no avail. The sound persists. It's late and I'm out of ideas, any suggestions would be very appreciated
03-17-2016, 12:26 AM
#2
Teching In
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Lately I've been noticing a miss in my 96 trans am. So, with no obvious causes and a quick scan of the codes, a intermittent miss code, I began a bit of basic maintanance. After pulling and cleaning the plugs, checking all the wires (which were fine and intact), and giving everything a good once over i put it all back together; And now it has the meanest noise ive ever heard. Like a cross between a miss, a backfire, and a knock. It sounds like someone slamming a sledge hammer to the inside of the block. It is loud, deep, and shakes the car a little. If i hold the tach over 2k it seems to disappear, but as soon as i let off the gas, bam, another slam. The gnarliest back fire ive ever heard. Thought maybe clogged converters were a culprit, alas to no avail. The sound persists. It's late and I'm out of ideas, any suggestions would be very appreciated
my leak was from pvc valve but when have you changed intake gaskets and is the rear intake gasket intact?
03-17-2016, 08:17 AM
#3
Lately I've been noticing a miss in my 96 trans am. So, with no obvious causes and a quick scan of the codes, a intermittent miss code, I began a bit of basic maintanance. After pulling and cleaning the plugs, checking all the wires (which were fine and intact), and giving everything a good once over i put it all back together; And now it has the meanest noise ive ever heard. Like a cross between a miss, a backfire, and a knock. It sounds like someone slamming a sledge hammer to the inside of the block. It is loud, deep, and shakes the car a little. If i hold the tach over 2k it seems to disappear, but as soon as i let off the gas, bam, another slam. The gnarliest back fire ive ever heard. Thought maybe clogged converters were a culprit, alas to no avail. The sound persists. It's late and I'm out of ideas, any suggestions would be very appreciated
03-17-2016, 10:24 PM
#5
11 Second Club
The only time I had a backfire that bad I broke a rocker stud on the exhaust side and the exhaust was coming thru the intake causing a loud pop..
03-18-2016, 06:53 AM
#6
This is basic troubleshooting.....you had a minor problem, which you, of course, tried to track down. In doing so, you removed/replaced some items, and the problem worsened after you did this. This would indicate that whatever you touched/disturbed, is part of your initial problem.