180 Degree Idle Surge

[Scotty]

Have you tried plugging the PCV port in the manifold to see if that makes a difference?

I had before all of this and the engine didn't seem to like it at all, like it cut out all the air it needed or something. I'll try it again if it would help but after reading about deleting the PCV I'm kind of apprehensive of messing with it.

 

[jumpinjan]

the engine didn't seem to like it at all

If the PCV was removed and hole was plugged, the engine shouldn't really care and run fine.
Jan

 

[Scotty]

If the PCV was removed and hole was plugged, the engine shouldn't really care and run fine.
Jan

So the longevity of the engine would be the same either way?

I stopped blanking it and put it back on when folks discussed the benefits of having it. I can only say what I'm experiencing and maybe some of it sounds crazy, but I'm experiencing it.

The underlining is kind of excessive. What was your point in doing that? I can read fairly well and been able to keep my car driving with the input of folks here and good old fashioned hard work for over four years as a damn reliable daily driver, so I don't have a problem with comprehension but with not having decades of experience, so I ask.

Is that a problem?

 

[mxp01]

Scotty,

I wouldn't get to worked up on Jan underlining some of his response. I read it no different as my college text books having bold or underlined sentences. I could read quite well by then and did not think of it as an insult. When I see that kind of text I read it as "hey this is important so pay attention"

You said when you did the smoke test and had a lot of smoke come out thru that bolt hole on the tappet cover. How is your compression? do you have a lot of blow by creating excessive positive crank case pressure?

I have read the threads on the pros and cons of running and not running a PCV. I personally did not have one on my 1600 and do not have one on my 1725, I just let the engine vent into the atmosphere.

 

[jumpinjan]

I do that to emphasize that it is a...FACT and not an opinion.
Jan

 

[hartmandm]

I think the point was that removing the PCV valve and plugging the port is a test to perform to assist in figuring out what is going on with your setup. I didn't interpret the suggestion as you should run without a PCV setup go forward. You indicated the car didn't run as well without the PCV setup in place. I think the engine should run better without the PCV setup in place, so I think that is worth investigating.

Mike

 

[Jay Laifman]

Seems odd that a loose bolt on the valve cover would cause any issue. Early Alpines have a draft tube. Open to the world. It is the same air space as the valves. So I don't see how a draft tube would run fine but a loose valve cover bolt would not.

Separately, my valve cover is held on by long studs and nuts. I was not aware any had really long bolts.