Carb or Timing problem
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Freshman User
Joined: Jun 2004
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Carb or Timing problem
The engine is a 360 in my 1973 F100 I just bought it 2 days ago. I keep getting blow back through the carb. When I try to burp the throttle from idle it misses, hiccups, and shoots a ball of fire out of the carb. Somebody told me it was a timing problem. What do you guys think? If it the timing how and where do I check it. This is the first carb engine Ive owned. So Im just learning and at 22 years old I just got out of the 4 bangers to the good engines. (V-8's)
Last edited by ratman-73ford; Jun 20, 2004 at 07:11 PM.
Laughing Gas
Joined: Jul 1999
Posts: 1,048
Likes: 22
From: Lacey, WA
Hi,
You need a timing light to check the timing. The light has a red and black wire which go to the battery. Then there is another cable with a black colored pick up that you put the #1 spark plug wire thru.
With the engine idleing, everytime the #1 plug fires, the timing light will flash also. Point the light down at the balancer from the drivers side and you should see some lines and numbers on the rotating balancer appear. Sometimes dirt makes it hard to see. These line up with a pointer sticking out from the engine. You change the "timing" by loosening up the distributor hold down clamp and slightly rotating the distributor. Don't forget to disconnect and plug the Vac advance line on the dissy first.
Adjust to specs.
Hope this helps,
You need a timing light to check the timing. The light has a red and black wire which go to the battery. Then there is another cable with a black colored pick up that you put the #1 spark plug wire thru.
With the engine idleing, everytime the #1 plug fires, the timing light will flash also. Point the light down at the balancer from the drivers side and you should see some lines and numbers on the rotating balancer appear. Sometimes dirt makes it hard to see. These line up with a pointer sticking out from the engine. You change the "timing" by loosening up the distributor hold down clamp and slightly rotating the distributor. Don't forget to disconnect and plug the Vac advance line on the dissy first.
Adjust to specs.
Hope this helps,
Junior User
Joined: Dec 2003
Posts: 55
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From: Willamette Valley Oregon
Does sound like a timing problem you will need a timing light to check you can get one at most part stores there should be instructions with it . Something like attach pickup to #1 plugwire etc timing marks are on the H. balncer at the front of the engine I cant remeber timing specs but I think Its 6 tdc. Iam sure some else will give you more help oop see I was right someone allready beat me to theb punch
Junior User
Joined: Dec 2003
Posts: 55
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From: Willamette Valley Oregon
If the dist was removed it may be 180 degrees out of turn easy to do if you dont mark it on removal
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New User
Joined: Dec 2003
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If the dist isn't 180 out, I would also double check the firing order. Had that happen on my 79 f-250 once. Just my.02!
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Freshman User
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Originally Posted by F250-76
If the dist isn't 180 out, I would also double check the firing order. Had that happen on my 79 f-250 once. Just my.02!
Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
The firing order is cast into the top of the intake manifold. It will be a series of 8 numbers separated by dashes. Right near the words 'Firing order'. I think it is right near the front drivers side, but it's been years...1 8 5 4 6 3 7 2???
If it is not popping back when it is idling, (as in not missing, also) the firing order should be fine.
You can also get backfire if the accelerator pump is defective. It squirts a little fuel each time you press on the gas, to make sure the mixture does not lean out. If it is defective, you will also get hesitation on acceleration.
If the vacuum advance is too effective, you can also get backfire...
tom
If it is not popping back when it is idling, (as in not missing, also) the firing order should be fine.
You can also get backfire if the accelerator pump is defective. It squirts a little fuel each time you press on the gas, to make sure the mixture does not lean out. If it is defective, you will also get hesitation on acceleration.
If the vacuum advance is too effective, you can also get backfire...
tom
Laughing Gas
Joined: Jan 2002
Posts: 1,008
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From: Tucson
The FE firing order is: 1-5-4-2-6-3-7-8. The rotor travels counter clockwise. The cylinders on the right side of the engine (looking from the driver's seat) are 1 through 4 (front to back) and the left side is 5 through 8 (front to back). Tom, that almost sounds like a Chevy (18436572)!
jor
jor
Senior User
Joined: May 2004
Posts: 278
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I don't think the motor would start at all if the distributor was 180 degrees off.
the wires could be in the wrong firing order though
A carb problem probably would not send flames back through the carb
To check to see if the timing chain is loose,
You could remove the distributor cap and place a socket and wrench on the center bolt on the harmonic balancer and slightly turn the motor back and fourth clockwise/counter clockwise. the rotor should move immediatly when you move the bolt. There should be no slack at all. Maybe slight with chain wear. Might need to pull the sparkplugs for this.
Good Luck,
Ken
the wires could be in the wrong firing order though
A carb problem probably would not send flames back through the carb
To check to see if the timing chain is loose,
You could remove the distributor cap and place a socket and wrench on the center bolt on the harmonic balancer and slightly turn the motor back and fourth clockwise/counter clockwise. the rotor should move immediatly when you move the bolt. There should be no slack at all. Maybe slight with chain wear. Might need to pull the sparkplugs for this.
Good Luck,
Ken
Laughing Gas
Joined: Jun 2003
Posts: 1,166
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From: Chino, California
On a Ford, you can get the distributor out 6 different ways, not just 180 degrees. The distributor drive shaft is hex shaped, and so is the receiving (driven) end of the distributor shaft.