67 falcon exhaust. miss? Weird sound? |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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Posted: 21-March-2014 at 12:24PM |
Hey guys, I put up a quick video to ask what you guys think this is.....it's like a tapping or popping sound and it's only coming out of the left pipe. It sounds like it has a miss? What could cause. That? I couldn't run it for very long because of my fan.
Well here's the link: https://www.youtube.com/watch?v=kOUBLW1J4uQ This may work And no, I did not put the stupid hitch on the car lol Edited by Grantorinosport351 - 21-March-2014 at 12:26PM |
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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(Insert sounds of crickets chirping)
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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could be a plug misfiring, plug wire breaking down, any leaks at the headers? does it still pop under throttle? do you have a timing light? you could put the timing light pickup around each wire and watch the light see if it stops flashing at the same time as the pop to find if it is an offending wire. pull the plug wires one at a time see if you can locate the cylinder at is misfiring, if the idle don't change but the popping stops that may be the cylinder, then you can look into that cylinder more, make sense?
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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No exhaust leaks, and I don't think it still pops under throttle, and I don't have a timing light, but I have a friend who could let me use one.
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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Yes, still pops under throttle
Sounds like maybe that's a timing issue? Edited by Grantorinosport351 - 22-March-2014 at 6:14AM |
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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unlovedford
Senior Member Joined: 17-December-2010 Location: Tennessee Status: Offline Points: 10142 |
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Sounds like it is pulling air in somewhere.
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Joe
1972 Mom's Squire Wagon 1972 Torino Wagon 1976 Torino 1968 Cougar XR7-First batch 1972 Torino 460 1989 BroncoII/Jeeps/Titanimous Popeye and Brutus (Rams) |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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So valve adjustment?
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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unlovedford
Senior Member Joined: 17-December-2010 Location: Tennessee Status: Offline Points: 10142 |
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Ok, this is old school, but...
Take a dollar bill, hold it on both ends with your fingers, give the bill a small bit of slack and place it against the opening of the left pipe. If it tries to suck the bill in, you may have a bit of a problem. If so, pull your coil wire off, and crank the engine over for about 15 seconds. Steady sound = something in your fuel or spark. Uneven cranking sound or a "dip" in the sound the starter makes and it means a burnt valve. Old school, but it works. I would suspect improperly adjusted rockers, bent pushrod first, though. Edited by unlovedford - 22-March-2014 at 6:52AM |
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Joe
1972 Mom's Squire Wagon 1972 Torino Wagon 1976 Torino 1968 Cougar XR7-First batch 1972 Torino 460 1989 BroncoII/Jeeps/Titanimous Popeye and Brutus (Rams) |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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Yeah, I did that paper trick, and every few seconds It would do that
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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Joe, here's the Link to cranking sound: https://www.youtube.com/watch?v=moYofv2UFCQ
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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dave302
Senior Member Joined: 08-October-2009 Location: usa Status: Offline Points: 3171 |
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unlovedford
Senior Member Joined: 17-December-2010 Location: Tennessee Status: Offline Points: 10142 |
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No compression issues there. It cranks strongly and evenly. Check plugs and wires. Readjust your carb as well.
Edited by unlovedford - 23-March-2014 at 1:12AM |
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Joe
1972 Mom's Squire Wagon 1972 Torino Wagon 1976 Torino 1968 Cougar XR7-First batch 1972 Torino 460 1989 BroncoII/Jeeps/Titanimous Popeye and Brutus (Rams) |
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Big Bird
Senior Member Joined: 25-August-2013 Location: New York Status: Offline Points: 4194 |
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Look for an exhaust leak. check header flange and work your way back. look for soot/blown gasket at the flange or connections. Your first video SOUNDS like an exhaust leak while running a bit rich. (choke on?) The dollar bill trick will show a bent/sticking/burnt valve, but will also react to an exhaust leak if the engine is running rich/burning off in the exhaust system.
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"What we do in full frontal view, is more honest than your cleaned-up mind."
Randy 1979 T-Bird 2005 F-150 STX RCSB 4.6, 3.55 LSD How the Heck does a REGULAR CAB SHORTBED weigh over 5200 pounds? |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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I checked, and I couldn't find any leaks?
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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Ok, I found out, that a non working alternator can cause a miss, and I think that's my problem! Today I'll check it, I'm supposed to be getting in a 1 wire soon, but knowing peopls "deals" these days, I'm not sure I'll get it......I don't think I'm going to order off of eBay from now on unless I absolutely have to!
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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unlovedford
Senior Member Joined: 17-December-2010 Location: Tennessee Status: Offline Points: 10142 |
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AutoZone has GM 1 wire units dirt cheap. Lifetime warranty. Bought one for my '68 F100 a few years back for $35. Cheap.
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Joe
1972 Mom's Squire Wagon 1972 Torino Wagon 1976 Torino 1968 Cougar XR7-First batch 1972 Torino 460 1989 BroncoII/Jeeps/Titanimous Popeye and Brutus (Rams) |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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Did you buy a custom bracket, or did you just make it fit lol
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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unlovedford
Senior Member Joined: 17-December-2010 Location: Tennessee Status: Offline Points: 10142 |
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Made mine fit, which turned out far more easy that I could have imagined. Everything on that truck has been..custom.
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Joe
1972 Mom's Squire Wagon 1972 Torino Wagon 1976 Torino 1968 Cougar XR7-First batch 1972 Torino 460 1989 BroncoII/Jeeps/Titanimous Popeye and Brutus (Rams) |
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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bryan, it just hit me! you just got the alternator right now (your other thread) were you running the car without an alt.? and getting low on battery? that can cause a weak field in the coil and will pop and backfire just before dying, it just came to me!
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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That's what I was thinking, I think I posted something like that somewhere, but popping on only one side?
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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??? stranger things have happened! maybe, maybe not, but a possibility!
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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Thanks, I'll let you guys know, after I get everything fixed.
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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Big Bird
Senior Member Joined: 25-August-2013 Location: New York Status: Offline Points: 4194 |
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If one or two plugs have a higher resistance, they may misfire without a steady, full current.
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"What we do in full frontal view, is more honest than your cleaned-up mind."
Randy 1979 T-Bird 2005 F-150 STX RCSB 4.6, 3.55 LSD How the Heck does a REGULAR CAB SHORTBED weigh over 5200 pounds? |
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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have you considered Induction Misfire ?
or just a plain old case of spark lost to ground by arcing through the wire? what was the battery voltage when it was missing w/o the alternator working? you might want to try the 'dark spark test' Edited by Rockatansky - 28-March-2014 at 4:15PM |
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72 GT Ute
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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AHHH the "dark spark test"
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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unlovedford
Senior Member Joined: 17-December-2010 Location: Tennessee Status: Offline Points: 10142 |
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Wasn't that first seen in Area 51?
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Joe
1972 Mom's Squire Wagon 1972 Torino Wagon 1976 Torino 1968 Cougar XR7-First batch 1972 Torino 460 1989 BroncoII/Jeeps/Titanimous Popeye and Brutus (Rams) |
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stanman
Senior Member Joined: 23-March-2007 Location: Nova Scotia, Ca Status: Offline Points: 1432 |
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C'mon guys....what's next ...."use the force"?...."these are not the low compression readings you're looking for"?........."Luke, it is not your carburetor"?....Sheesh!
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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("he's lost R2)
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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Grantorinosport351
Senior Member Joined: 11-August-2013 Location: Nocona tx Status: Offline Points: 1312 |
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I don't think the spark is arcing through the wire, they look fairly good (no holes, wears, ect.) not sure what the voltage was when running it. As soon as I can get another v-belt, after I take off the ps pump, and get a wire for the new alternator. Dark spark test? |
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~Bryan
72 gts h-code (formal roof) 67falcon 04 f250 ''the great white'' |
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Big Bird
Senior Member Joined: 25-August-2013 Location: New York Status: Offline Points: 4194 |
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From Wackipedia:
"Dark Spark refers to a realm of energy/space unseen but known to exist. Like Dark Matter, or the Dark Side of The Force, Dark Spark was once good, normal Spark. The Sith Lords turned Dark Spark against Good, and now it exists to confound all attempts to make a decent car run." After dark, open your hood and start the car. Look under the hood, (not with a flashlight) you may see arcing where your spark is shorting. You can also use a spray bottle and MIST the plug wires(DO NOT drown them). If you see arcing, you have a problem |
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"What we do in full frontal view, is more honest than your cleaned-up mind."
Randy 1979 T-Bird 2005 F-150 STX RCSB 4.6, 3.55 LSD How the Heck does a REGULAR CAB SHORTBED weigh over 5200 pounds? |
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