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Weird idle at diferent temps, I give up![140-160/72] posted by Anthony on
Sunday, 16 September 2001, at 8:37 a.m.
Hello.
I took the carbs off a few weeks back cause th carb-gaskets were leaking. At the same time I also took my dizzy apart to replace the points and condenser. Well, the timing has been set by driving it and adjusting it so it won't ping.
OK... here is the problem, the engine idles rough when first started, idles well during warm-up and operating temp, but as soon as the temp goes above the operating temp by just a little- or stuck in trafic, it will idle rough and will die out shortly.
I tried adjusting everything...but it just doesn't seem to get better, so I'm giving up and turning to you guys. Oh, I've hoked a vacuum guage up, the needle goes up and down realy fast +2, -2 really fast. Could it be a bad valve?
Thanks!
--144DL'72 B20B Bangkok, Thailand.
Re: Weird idle at diferent temps, I give up![140-160/72] posted by George Downs on
Sunday, 16 September 2001, at 6:50 p.m.
Hey.
I had some problems like that with my 164, and found that a high float
level or a float that sometimes sticks can cause symptoms like that -
you get a little flooding and the manifold is hot and it strangles
to death on gasoline vapor.
Re the distributor/timing - a little pinging under heavy load is not
a bad deal- retarding to completely eliminate it in any circumstance
may be overkill and will certainly affect both power and mileage,
perhaps also make your engine run hotter depending on how far it is
retarded.
The rapid fluctuation of vacuum may be a valve problem. Do you have
adequate valve lash on all of them? One valve with insufficient
clearance might not quite close when everything is hot, which will
confuse everything. In spite of the noise, it is better to have too
much valve clearance (lash)than not enough, especially the exhaust,
because the valve get most of their cooling from the valve seat.
This cooling is lost when the valve is not seated with quite a bit
of pressure, so if the valve lash is lost, you are almost holding the
valve off its seat and making it run hot. In any case it will cause
erosion of the valve seat and poor running and in exhaust valves will
even cause fairly deep cracks in the valve face, so they must be replaced.
George Downs Bartlesville, Oklahoma