Classic/Antique Car Repair/1969 ford ranchero

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Expert: - 9/29/2008


Question
what could make cyclenders 5, and 6 on an inline 6 300 engine not fire i cheaked the compression an the plugs are getting a spark im just stumped????

Answer
The first thing that I would do is to take a compression test. It is possible that the head gasket has blown between those two cylinders. The next thing to check is for a vacuum leak in the intake manifold between those two runners where it bolts to the head. If there is a vacuum line near these two cylinders remove it and plug the opening. If the engine smoothes out the device that line goes to could be leaking vacuum.

Classic/Antique Car Repair

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Brad Sears

Expertise

All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.

Experience

Automotive tech instructor. Syndicated auto columnist 1970's though the early 1990's. Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's TV Show "Last Chance Garage" 1980's PBS-TV syndicated. Auto instructor for the following companies: Fram Autolyte Holly Carter AMF Ford Motor University Of Conn Blue Hills Technical School Sugar River Technical Center Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.

Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.

Education/Credentials
More than I care to remember. Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.

Awards and Honors
Moto Award winner. And much more.

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