Your classic car classifieds & community
Register
Login to MyOldRide Account
Support
Home
Vehicle Classifieds
Parts Classifieds
Sell
OldRide Answers
Rusty Rides
Events
Clubs
Library
Close Search Box
Search
OldRide Answers Home
Using OldRide Answers
Ask a Question
Browse Questions In:
AMC
Buick
Cadillac
Chevrolet
Chrysler
Dodge
Ford
Lincoln
Mercury
Oldsmobile
Packard
Plymouth
Pontiac
Studebaker
Volkswagen
Other Makes
Classic Trucks
General Topics
General Questions
Help Identify
Classic Car News
General Restoration
Vehicle Maintenance
Site Suggestions & Comments
Search Questions:
cpackard
What is the best way to clean the carbon out of the engine?
Is motorvac safe? I have a 1966 Pontiac Catalina. Is it better to do it through the vaccuum lines or the carburator? Took my car to a garage and they said they could not do it b/c of it having a carberator and they said they could not shut off the fuel line. I don't know if this is true or they did not want to be bothered with it.
posted:
August 23, 2012
Answers
(
6
)
61pontiac
when the eng gets hot will it start or do you have to let it cool down to start it again. The best way is to run it thru alarge vacuum line, like the brake booster hose, or pcv hose. And most cleaner's you don't have to shut the fuel off. If its real bad you may have to remove the heads and use a brillow pad on a die grinder. The reason it is mostly carbouned up, is because the flange on the exhaust manafoid is shut. Some times its because there is know vacuum going to it. Or its stuck shut. check this, it should be on the rt side, were the exhaust pipe atacthes to the manafold.
posted:
August 23, 2012
retiredpartsman
many years ago before all these fancy liquids we used to bring the rpm up to abut 1000 and dump water slowly into the carb ,you would be suprised what came out of the tailpipe.
posted:
August 24, 2012
23dodges10
we used to hold a high idle and pour atf in the carb
posted:
August 24, 2012
61pontiac
water will shock the carbon off. It works
posted:
August 24, 2012
69hdflh
The best is using Marvel Mystery Oil, put some in oil, gas tank, and pour some down the carb while holding the throtle open a little to keep it from dying. You can tear down and look at valves and pistons after this and they will shine............
posted:
August 31, 2012
stranger
Though my past experiences with small block chevys yearsago pour atf down the carb, at high idle keeping it running until you see white smoke coming out of the pipes, then drown the engine till it kills. Wait a couple of minute for the atf to soak in the carbon then restart the engine, take it out and run moderatly not hard until it quits smoking. Carbon knock should be gone. Works great for me every time.
posted:
November 5, 2012