Backfiring
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Cargo Master
Joined: Nov 2010
Posts: 3,244
Likes: 40
Backfiring
I ran some seafoam throuh my truck last night and let it sit over night. I also ran mmo. It smoked like a sive today but seemed to run better. I noticed I had backfiring at high rpm and a loud back fire on shut down with dieseling. I'm thinking dirty plugs and timing is the culprit, am I correct?
Just an oops also. A guy bought my Edelbrock Streetmaster 460 intake on ebay for 85 dollars, today I shipped it and shipping was $53.19 looks like I lost on that auction lol. But atleast the intake was free so it pays for all the plugs and everything I have purchased for my pickup.
Just an oops also. A guy bought my Edelbrock Streetmaster 460 intake on ebay for 85 dollars, today I shipped it and shipping was $53.19 looks like I lost on that auction lol. But atleast the intake was free so it pays for all the plugs and everything I have purchased for my pickup.
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Cargo Master
Joined: Nov 2010
Posts: 3,244
Likes: 40
Nope I haven't checked the timing or replaced the plugs yet. They are dirty though, really in need of replacing. I've got motorcraft plugs to put into it just don't have a gapper and figured I'd do it all once. Can I run the stock gap with the plugs, or should I do it right?
Powervalve? What does this do, where is it found and how much would it cost?
Powervalve? What does this do, where is it found and how much would it cost?
Posting Guru
Joined: Jun 2009
Posts: 1,509
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From: Wagener, SC
This might answer your question:
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pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
Autolite 25's or Motorcraft SP450's
Should come gapped .044" out of the box.
No harm checking.
Yes, Holley carbs of this era are lacking the blowout prevention checkvalve.
Simple enough to install.
Holley sells a retrofit kit, #125-500
Amazon.com: Holley 125-500 Power Valve Check Ball Kit: Automotive
Should come gapped .044" out of the box.
No harm checking.
Yes, Holley carbs of this era are lacking the blowout prevention checkvalve.
Simple enough to install.
Holley sells a retrofit kit, #125-500
Amazon.com: Holley 125-500 Power Valve Check Ball Kit: Automotive
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Cargo Master
Joined: Nov 2010
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Likes: 40
I replaced the plugs today black and sooty one perhaps had oil on it but that I don't know for a fact. I noticed when I shut it down yesterday and today both after letting it run for 20 minutes or so I had a loud back fire. Today I just even went out and ran it, when I stomped on the gas it appeared that I had a backfiring condition at high rpm.
I left it in gear and popped the clutch a little so it was under power and I had no dieseling or backfire on shut down today, however I only ran the truck for about 5 minutes instead of the usual 20.
The only smoke that I have is when I start it up and it runs for about 2 minutes, and the smoke is gone. It perhaps is even water vapor as I say it dripping out the exhaust just the same as a modern rig.
So from what I understand, I have a blown powervalve and wrong timing. I figure I will adjust the timing and throw on a 670 Holley truck avenger, or another carb with center pivot bowl and racing vents and I guess a weiand intake but don't know about that either.
I left it in gear and popped the clutch a little so it was under power and I had no dieseling or backfire on shut down today, however I only ran the truck for about 5 minutes instead of the usual 20.
The only smoke that I have is when I start it up and it runs for about 2 minutes, and the smoke is gone. It perhaps is even water vapor as I say it dripping out the exhaust just the same as a modern rig.
So from what I understand, I have a blown powervalve and wrong timing. I figure I will adjust the timing and throw on a 670 Holley truck avenger, or another carb with center pivot bowl and racing vents and I guess a weiand intake but don't know about that either.
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pedant
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Senior User
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From: Effort, PA
He just doesn't seem to listen
pedant
Joined: Jan 2008
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From: EXTREME southwest CT
I told you from day one that you have multiple issues, start with the absolute basics (like all the vacuum leaks and a through tuneup) and then you can BEGIN to solve those problems one at a time.
Blame the carb if you like, but it is just an instrument to meter fuel. It CAN'T be anything BUT stupid.
If it is broken or incorrectly adjusted that is not IT'S fault.
If your timing chain is so sloppy that a backfire blew out your powervalve, it is NOT the fault of the carburetor.
The fact is, EPA tried to make it idiot proof by not allowing ANY mixture adjustments.
Trying to force it to compensate for a dozen other faults is never going to make it -or the truck- run right.
JMHO...
Blame the carb if you like, but it is just an instrument to meter fuel. It CAN'T be anything BUT stupid.
If it is broken or incorrectly adjusted that is not IT'S fault.
If your timing chain is so sloppy that a backfire blew out your powervalve, it is NOT the fault of the carburetor.
The fact is, EPA tried to make it idiot proof by not allowing ANY mixture adjustments.
Trying to force it to compensate for a dozen other faults is never going to make it -or the truck- run right.
JMHO...
Moderator
Joined: Nov 2007
Posts: 22,415
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From: Denver Metro Area, CO
matter what others try to tell you, and you seem to have a pre-conceived
negative attitude towards it because your father (or somebody close to you)
didn't like it.
C'est la vie.
