Hey Ron,
I just sprayed some carb cleaner around the intake manifold with engine idling ca 750-800 (still cold).
I had not connected the vacuum gauge. On the 300H 2x4 intake manifold, there is an area midway along the sides of the manifold which usually has the paint burned off and is where there is an opening through the manifolds to the valley below. When I sprayed that area, on both sides, the engine “changed” . It seemed to run smoother but at a lower rpm (??). I thinks its odd that it’s where that opening in the manifold is on both sides so carb cleaner is going into the valley. I think SOMETHING there is leaking but don’t know what. That manifold was removed last in 1986 in Ray Dorn’s back yard in Portland while I was on my way back from a meet in Victoria. I had a bad case of valve recession and had to have hardened seats put in on the road. I did not have a torque wrench so I just tightened the dickens out of the screws . I wonder if the gaskets have just burned.
Thanks,
Mike Moore
300H
ps. I think my failing starter made its last start! (Maybe)
Mike -
How are you testing for vacuum leaks ? My method is to
hook up a vacuum gauge and get a reading. Then with the gauge still connected,
spray carb cleaner at the base of the carb and around the edge of the intake. If
the numbers change significantly, you've found the problem.
Ron
----- Original Message -----
Sent: Monday, October 26, 2015 7:02
AM
Subject: Re: [Chrysler300] Chrysler 300H
idle speed
Thanks Keith for your input. I am not at all convinced I have
all the vacuum leaks identified and fixed. I reused my existing base
flanges gaskets with sealant added but ordered a new set of gaskets. I need a
new phenolic spacer but have been unable to find one yet on line. I am also
concerned that it may be the intake manifold to block leaking. Meanwhile, the
starter began to fail so I have to replace it. My plan now is to ship the dis
back to Philbin and ask Mark to check it for stability because the timing does
move around a bit and I should have realized that would cause the hunting. I
need to do that to scratch it off my list if nothing else. I have also
ordered a new set of ignition cables, and I do not think its those either.
If I have to take the intake manifold off, this is probably the time to
replace the camshaft with the stock camshaft (-although as I write that
I ask myself “What does that disassembly have to do with replacing the
camshaft?”-probably very little as the tasks are pretty much unrelated I
think).
Best, Mike Moore
300H Morgan Hill, Ca
Mike,
I suppose it could always turn out to be a distributor issue, but I'm
putting my money on your finding yet one more vacuum leak you haven't plugged.
Your symptoms sure sound similar to the challenging ones I had on a Quadrajet
GM car until our carb guru Jim McGowan at the Quad Shop found vac leaks in my
carburetor. Are you pretty sure everything is tight now in the intake
area?
Keith Boonstra
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