Back firing
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
How well does the engine run otherwise?
What does it get for fuel milage?
A lot of things could cause this including internal engine damage, but it could also be caused by a leaking/stuck open injector or a leaking fuel pressure regulator.
What does it get for fuel milage?
A lot of things could cause this including internal engine damage, but it could also be caused by a leaking/stuck open injector or a leaking fuel pressure regulator.
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New User
Joined: Jun 2021
Posts: 7
Likes: 0
From: Phoenix, AZ
I did lose one of the fuel pressure regulator screws when I replaced it. It don't get very good gas mileage maybe 9 or 10 mpg. And when i push on the gas pedal it put out **** ton of black smoke. And it has a hard time starting
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New User
Joined: Jun 2021
Posts: 7
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From: Phoenix, AZ
Hotshot
Joined: Jul 2020
Posts: 10,349
Likes: 2,588
From: Near Salt Lake City
Some are mounted right atop the air pump
Some 7.5's and 5.8's had 2 thermactors (air pumps)
They all had TAB and TAD solenoids to control them (thermactor air diverter and thermactor air bypass solenoids)
When I said better check the diverter valve (operation) is what I mean
Most likely you have a cracked vacuum line to one of the solenoids
Might want a dealer tech to take a look
Not a complicated system but there is quite a bit to it
Good luck
Some 7.5's and 5.8's had 2 thermactors (air pumps)
They all had TAB and TAD solenoids to control them (thermactor air diverter and thermactor air bypass solenoids)
When I said better check the diverter valve (operation) is what I mean
Most likely you have a cracked vacuum line to one of the solenoids
Might want a dealer tech to take a look
Not a complicated system but there is quite a bit to it
Good luck
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Hotshot
Joined: Jul 2020
Posts: 10,349
Likes: 2,588
From: Near Salt Lake City
The problems we used to see with backfires usually meant that the diverter valve was not diverting (farting)
So the truck would get air pumped downstream when it was supposed to be diverting to atmosphere (when diverting they make a fairly loud farting sound)(the air shoots out where you see the felt)
This downstream air at the wrong time is what was causing the backfires
Replaced a lot of valves and solenoids back in the day only to find the real culprit was a vacuum line
Did have a rash of bad tab and tad solenoids too right about your trucks era
So the truck would get air pumped downstream when it was supposed to be diverting to atmosphere (when diverting they make a fairly loud farting sound)(the air shoots out where you see the felt)
This downstream air at the wrong time is what was causing the backfires
Replaced a lot of valves and solenoids back in the day only to find the real culprit was a vacuum line
Did have a rash of bad tab and tad solenoids too right about your trucks era
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