Ignition or Vacuum problem?
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Joined: Nov 2001
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Ignition or Vacuum problem?
Great forum and thanks in advance. I've got a rebuilt 73 302 that my mechanic talked me into replacing the edelbrock with a 600 Holly because it was running really rough and there was no way to hook up the kick down gear to the Edelbrock. It now runs horribly when starting out or when cruising around 15 - 35 mph or whenever there's not much load on the engine. He pointed out that he thought there was a vacuum leak in the intake and that maybe it wasn't the right one for that engine. Then he pointed out that there are three plug wires that are sparking but when disconnected from the distributor- it doesn't effect the sound of the engine at an idle. It seems to me that it's an ignition problem. Like those cylinders aren't firing in the first place if you can remove the fire and there's no difference. Is this right? Also, I've noticed in the past that I can smell gas in the exhaust although I haven't really checked since the switch. Thanks for any advice y'all might have.
Trent
Trent
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Joined: Jan 2008
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Ignition or Vacuum problem?
Check the firing order of the engine first.
1-5-4-2-6-3-7-8
Turning Counter-clockwise
try again.
Once the order is confirmed Correct
For vacuum leak :grab a can of carb cleaner and spray in intake man/gasket seams where a leak might take place.
Dennis https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=1733&.jpg
Please Don't Ask Me Any Tough Questions As:
"I'm Saving My Memory For When I Develop Alzheimer's"
78 F-150 429CJ,Silver
w/Explorer Pkge.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon
1-5-4-2-6-3-7-8
Turning Counter-clockwise
try again.
Once the order is confirmed Correct
For vacuum leak :grab a can of carb cleaner and spray in intake man/gasket seams where a leak might take place.
Dennis https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=1733&.jpg
Please Don't Ask Me Any Tough Questions As:
"I'm Saving My Memory For When I Develop Alzheimer's"
78 F-150 429CJ,Silver
w/Explorer Pkge.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon
Freshman User
Joined: Nov 2001
Posts: 25
Likes: 0
Ignition or Vacuum problem?
Thanks for all the great advise. I did check the firing order and it seemed to be ok. I hope it's a matter of plugs and wires. I'll check them. What I meant by them firing is when I pull the wires off of the distributor, and hold them close to the socket, I can see and hear a spark. So, I guess that the juice is getting to the plug at least. I'll see about the vacuum leak in the intake too. Thanks!
