454 Tries to keep running when I turn it off.?

Question

Hi;
I just tuned up my 1987 Komfort Moter Home. I replaced everything, but I did not have a timing light. When I turn it off it tries to keep running for a few seconds, then it turns backwards and blows gas out of the carb. If this is because of the timing, what should I do advance or retard the timing?

Answer 1

sounds like a timing issue to me, why dont you take it to a shop and have it set by an ase certified technician?

Answer 2

No. It's not timing related.
With the key off, the ignition is not active.

Turn the idle down to about 700 rpm with the engine warmed up.

Dieseling or engine run-on is a condition which can occur in spark plug gasoline powered internal combustion engines whereby the engine keeps running for a short period after being turned off, due to fuel igniting without a spark.

Dieseling is so-named because it is similar in appearance to how diesel engines operate, by firing without a spark

Built-up carbon in the ignition chamber can glow red after the engine is off, providing a mechanism for sparking unburnt fuel. Such a thing can happen when the engine runs very rich, depositing unspent fuel and particles on the pistons and valves. Similarly, non-smooth metal regions within the piston chamber can cause this same problem, since they can glow red. It has also been suggested that an improperly rated spark plug can retain heat and cause the same problem.
A carburetor that does not close entirely can contribute to running once the engine is off, since the extra fuel and oxygen mixture can combust easily in the warm piston chamber. Similarly, hot vaporized oil gases from the engine crankcase can provide ample fuel for dieseling.
Incorrect timing.
An engine that runs too hot or too lean may produce an environment conducive to allowing unspent fuel to combust.
An idle speed that is too fast can leave the engine with too much angular momentum upon shutdown, raising the chances that the engine can turnover and combust more fuel and lock itself into a cycle of continuous running.

Answer 3

Yes its the timeing. get a timeing light or take in and have it timed. with out a doubt though its the timeing. im not shure about advanceing or retarding, i suggest you get a timeing light.

Answer 4

you called the answer move it one way see if that works but keep track of your movements of the timing belt use a marker to gage. if it keep getting worse go the other way from the first time you started adjusting it hope that works for you

Answer 5

try running a higher octane this should stop the run on