Exploded Another Muffler
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Freshman User
Joined: Aug 2009
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From: East Tennessee
Exploded Another Muffler
Second time in the last year I lost ignition in my 360, backfired and exploded a muffler. I put an Ignitor in the distributor and a new coil 2 years ago.
Very sporadic. It has skipped maybe 5 or 6 times, and backfired the 2.
Any ideas? How do I troubleshoot?
Very sporadic. It has skipped maybe 5 or 6 times, and backfired the 2.
Any ideas? How do I troubleshoot?
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Takes 2 things to make the bomb, fuel & spark. If you are getting fuel (gas) into the muffler (enough for an explosion) the carb needs work.
There are others here that can better prescribe a course of action. Which carb (brand & model) is currently on the truck?
John
There are others here that can better prescribe a course of action. Which carb (brand & model) is currently on the truck?
John
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Freshman User
Joined: Aug 2009
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From: East Tennessee
There are no obvious shorts, etc.
Are the Petronix Ignitors pretty dependable? Is there a way to test them?
Going to do the cap and rotor thing today.
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Make sure the distributor is grounding properly. I had a truck once that lost spark, a friend tried getting it running again. He turned the distributor while cranking, it made the connection and blew one of the mufflers wide open.
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Freshman User
Joined: Aug 2009
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From: East Tennessee
thanks John and Jared.
I put new wires, cap and rotor on. purrs like a wildcat. the ground looked good. i think the problem was the coil wire. It looked ragged.
thanks again fellers. btw, i love both your signatures
I put new wires, cap and rotor on. purrs like a wildcat. the ground looked good. i think the problem was the coil wire. It looked ragged.
thanks again fellers. btw, i love both your signatures
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
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From: East Tennessee
Oops, spoke too soon
Did it again this evening. There is no pattern. Was running like new, then loss of power, boom and back to full power in about 2 seconds. Strange 
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From: San Francisco East Bay
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is it possible that you are losing power to the coil? maybe a flaky ignition switch?
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Freshman User
Joined: Aug 2009
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From: East Tennessee
Is there a way to test or better to just replace?
Posting Guru
Joined: Mar 2006
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but if you want to try it, here's what i'd do:
disconnect the wire from the starter relay "S" terminal (so the truck won't try to start)
disconnect the wire from coil +.
voltmeter black lead to ground
voltmeter red lead to the wire you just took off the coil +
if you have a 'continuity' setting on the meter, use it.
if you don't, you should be able to read ~9v at the wire with the key in start or run.
(you could also do this with a test light)
turn the key on/off/on/off...see if you can get it to misbehave.
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