What happened?????
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More Turbo
Joined: Nov 2000
Posts: 715
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From: Erie, PA
What happened?????
I've got an old 78' F-150 plow truck, I have been using it for the winter to plow my driveway (not street legal). I used my normal starting procedure; Pump until my leg falls off and then turn the key.
Well to my surprise, I did not even turn it to start, I turned it to "on" and it let out a huge backfire, I mean loud!! And the engine started by itself and then stalled after 10 seconds like it normally does.
After close inspection, the backfire blew the air filter apart and now I have a small exhaust leak. Why did it start without the starter? I have never seen this before. I can hardly believe this myself even though I was there.
Well to my surprise, I did not even turn it to start, I turned it to "on" and it let out a huge backfire, I mean loud!! And the engine started by itself and then stalled after 10 seconds like it normally does.
After close inspection, the backfire blew the air filter apart and now I have a small exhaust leak. Why did it start without the starter? I have never seen this before. I can hardly believe this myself even though I was there.
Thread Starter
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More Turbo
Joined: Nov 2000
Posts: 715
Likes: 11
From: Erie, PA
The entire truck is a junk pile. The engine still and has always run smooth. The only problem is it does not hold oil psi. Its been like this since 1989 when I bought it for a plow truck.
Very odd, I have explanation. It is impossible for an engine to hold compression overnight.
Very odd, I have explanation. It is impossible for an engine to hold compression overnight.
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Joined: Sep 2001
Posts: 30,255
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You pumped the intake full of gas, with the ignition system powered up. When the key broke contact in the run position before it even made contact in start the duraspark ignition box powered down which throws a spark. It just happened to ignite some fuel that had found its way past a valve. The entire mixture in the intake blew.
I would suggest setting the choke properly and only pumping it once or twice b4 starting. Once it is turning over you may need to pump it a time or two if the choke is not set properly. Make sure your fuel pump is good. If you do not use the truck very often an electric fuel pump helps to prime the fuel system.
I would suggest setting the choke properly and only pumping it once or twice b4 starting. Once it is turning over you may need to pump it a time or two if the choke is not set properly. Make sure your fuel pump is good. If you do not use the truck very often an electric fuel pump helps to prime the fuel system.
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