Ok....now what?
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Senior User
Joined: Apr 2005
Posts: 453
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From: medford oregon
Ok....now what?
Van has been running great, No issues. I looked under the hood and realized the distributor vacuum advance hose had come off from the carb. I put it back on with some hose clamps, revved the engine and got this gnarly low lumpy popping in the engine. I put the timing light on it and its fine at idle but goes way too the left when revved. Any ideas?
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
Van has been running great, No issues. I looked under the hood and realized the distributor vacuum advance hose had come off from the carb. I put it back on with some hose clamps, revved the engine and got this gnarly low lumpy popping in the engine. I put the timing light on it and its fine at idle but goes way too the left when revved. Any ideas?
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
It also could be your initial timing is to far advanced already ..
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
Have you done anything to recurve the distributor to compensate for the lack of the egr ?
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
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Senior User
Joined: Apr 2005
Posts: 453
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From: medford oregon
heres the routing of the vacuum from the valve covers to the intake. Looking from the front of the engine left rear goes to the air filter, right front goes to the center vacuum port on the carb. Brake booster goes to a fitting on the manifold.
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Lead Driver
Joined: Nov 2006
Posts: 5,217
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From: Pa.
If your running a performer intake then it's not there and if it's a 1978 460 then your running a Duraspark II distributor if it's stock .. In which case you'll need to recurve the distributor to get it running correctly ..
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
The emissions 460 with egr had the distributor set up with a timing that was only correct to run with an egr .. If the egr is taken off the distributors mechanical timing will be wrong for the motor .. you have 2 options either buy a distributor that is already recurved or recurve the one you have ..