Loud Engine ticking....

[CorvAir Force]

Sooo...car (140 hp) was dieseling and had occasional backfire when I turned it off. Following a flooding incident (with a Carb and Choke cleaner starting attempt) there is a large tick which makes it sound like a miss (speeds up with revving, etc.). I haven't troubleshot it yet but I'm thinking a Valve issue or adjustment....any thoughts? What is the easiest way to check it out?


Thanks in advance!
Gary

[bbodie52]

Not really enough info here for a good analysis. Perhaps a "health check, starting with a cylinder compression test and perhaps an examination of the valve train -- looking for sticking valves, etc. Then check over the ignition system, checking points, cap/rotor, timing, plug wires to ensure that subsystem is in good shape. If no problems found, on to the carburetors for cleaning and adjustment, checking for vacuum leaks, etc. Somewhere along the way you may discover more clues that will lead to better analysis and repair.

By the way, on a Corvair the compression tester with the flexible hose works better, because of the cramped spark plug area adjacent to the carburetors, and the sheet metal shroud that makes access to the spark plug holes difficult. A remote starter switch is also helpful, to allow you to crank the engine from the engine compartment. It is easily connected to the two-terminal starter harness connector near the firewall and throttle linkage on the left side (Item 3 - 12 GA Purple Wire in the diagram). Unplugging this connector and connecting one lead of the remote starter switch to the purple wire that goes to the starter solenoid, and the other remote switch lead to the positive battery terminal, will allow you to trigger the starter solenoid using the remote starter switch, as if you were turning the ignition key. You do not need the key and the ignition switch does not have to be on to do this, and you will be able to crank the engine and take your compression tester readings without an assistant needed to crank the engine from the driver's seat. The procedures are covered on page 6-3 of the 1965 Corvair Chassis Shop Manual.

1965-1969 Corvair Engine Compartment Wiring Harness Starter Connections.jpg (80.88 KiB) Viewed 377 times

[flat6_musik]

X 2. You could do a compression check and if you're feeling really peppy, remove the valve covers just to see what you can.