1987 Ford Ranger

JOHNLYLE1

MEMBER
1987 FORD RANGER

Engine Mechanical problem
1987 Ford Ranger 4 cyl Two Wheel Drive Manual

the car has a bad missing problem, number 2 cyl seems dead. Replaced spark plug wires and plugs. Seems to have compression, but I don't know. Took valve cover off everything seems ok. Please advise.

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Check the engine compression wet and dry tests an get back with the readings

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Thursday, January 22nd, 2009 AT 11:45 PM

JOHNLYLE1

MEMBER
3 POSTS

Compression on number2 is only 20 lbs, suspect burnt valve.

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Friday, January 23rd, 2009 AT 12:21 PM

OBXAUTOMEDIC

MECHANIC
3,711 POSTS

Hello,

IS IT THE RINGS OR THE VALVES?

If compression is low in one or more cylinders, you can isolate the problem to the valves or rings by squirting a little 30 weight motor oil into the cylinder through the spark plug hole and repeating the compression test. The oil temporarily seals the rings.

If the compression readings are higher the second time around, it means the rings and/or cylinder is worn. No change in the compression readings would tell you the cylinder has a bad valve.

.

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Friday, January 23rd, 2009 AT 12:26 PM