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Backfiring
- Thread starter jaybird
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tony barnhill
Great Pumpkin - R.I.P
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So, its spitting through the carb throats?
OP
jaybird
Yoda
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Seems to be. I just got home with her, haven't popped the bonnet yet. Wanted her to cool down some, for a cold start. Might have wait til morning...
She seems to be revving high too, about 15-1600. I set it back down to about 850 or so, but it inched back up on the 30 minute drive to Lowe's. Bad spring in there?
She seems to be revving high too, about 15-1600. I set it back down to about 850 or so, but it inched back up on the 30 minute drive to Lowe's. Bad spring in there?
startech47
Jedi Knight
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Check the carb. to intake manifold fasteners and the intake manifold to block fasteners. If them are coming loose you will have a vacuum leak that can cause these symptoms. This happened on my Sprite. Phil
startech47
Jedi Knight
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The intake or carb. fasteners could have started to loosen at the same time. Generally the air leak would be on the intake side causing the engine to speed up and not the exhaust side, but the vibration could have loosened up both sets of fasteners. This is an easy check, just make sure they are tight with a wrench and start er up. Phil
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jaybird
Yoda
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Had another issue with her that was a bit more pressing. Friday Chuck took her out, got caught in a traffic blockage on the JB Bridge road (construction) She died. Didn't overheat, but wouldn't restart. Had to flatbed her home (4 or 5 miles from our house) So we addressed that issue yesterday, had a wedding yesterday, was gone all day today. Haven't really driven her to get to the backfiring - wondering if it was related? He'll take her out tomorrow and I'm driving her to a concert at the amphitheater (John Fogerty) on Tuesday. I'll get back with ya on this by Wednesday.
tony barnhill
Great Pumpkin - R.I.P
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Vapor lock?
tony barnhill
Great Pumpkin - R.I.P
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Oh, they will - especially if the heat shield between the carb & exhaust is shot or missing!
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I had a vapor lock problem with my 72 when the outside temp went in the 90s. It happened when running slow for a period of time in traffic at Myrtle Beach. (Don't know why I was there, can't stand the place), anyway, I found that the fuel supply line as it runs behind the engine was so hot, you couldn't touch it. Crazy as it sounds, I bought fuel line insulating tubing from Whitney, color black, slid it over the supply line from the filter around behind the engine and down the passenger side fire wall and haven't had the problem since. The black color kinda makes it dissapear and you don't even notice it being there. Worked for me. /ubbthreads/images/graemlins/rolleyes.gif PJ
^^
was the car running the entire time when it happened?
or had you parked for awhile then it happened?
could you hear your fuel pump ticking or was it silent?
I think the exact thing happened on my car recently. I dread having to change the pump as its brand new and the car restoration I started in 1996 just completed finally this summer.
I wanna drive the thing. /ubbthreads/images/graemlins/smile.gif
was the car running the entire time when it happened?
or had you parked for awhile then it happened?
could you hear your fuel pump ticking or was it silent?
I think the exact thing happened on my car recently. I dread having to change the pump as its brand new and the car restoration I started in 1996 just completed finally this summer.
I wanna drive the thing. /ubbthreads/images/graemlins/smile.gif
tony barnhill
Great Pumpkin - R.I.P
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[ QUOTE ]
I found that the fuel supply line as it runs behind the engine was so hot, you couldn't touch it.
[/ QUOTE ]
The fuel line actually came from the factory with a piece of metal protecting it from heat...it was kinda "L" shaped & attached to the bottom edge of the heater...fuel & electrical lines ran behind it & electrical lines were attached to a corner of it.
I found that the fuel supply line as it runs behind the engine was so hot, you couldn't touch it.
[/ QUOTE ]
The fuel line actually came from the factory with a piece of metal protecting it from heat...it was kinda "L" shaped & attached to the bottom edge of the heater...fuel & electrical lines ran behind it & electrical lines were attached to a corner of it.
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The little metal heat shield is in place Tony, but it was very hot that day at the beach, close to 100, in heavy traffic running from slow to stop and the temp gauge was running about three quarters up and it never gets over half. As soon as I could get away from that situation, everything seemed to go back to normal. It might never vapor lock again but, I put the fuel line insulation on just as a precaution. /ubbthreads/images/graemlins/driving.gif PJ
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