Over the winter I replaced the draft tube on my 51 239L6 with a PCV valve. Modified the valve cover and connected it to the intake manifold between #1 and #2/3 cylinders. Got the old girl fired up last night and she ran really good until the choke came off, then it wouldn't idle worth crap. I know the PCV acts like a vacuum leak, and when I plugged the line on the PCV valve, the idle returned to normal.
What do I need to adjust to get the idle back into place ?
Or the other thing I was thinking, should I route the hose from the PCV valve into the breather instead - not creating the vacuum problem to begin with ??
What did the PCV valve come out of - what application? Everyone is different -orfice size according to engine size ect. You may need a smaller one and yes you most likely will need to readjust the idle mixture.
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'68 Parisienne 2+2 Convertible Matador Red (Resale Red but not for sale).
What did the PCV valve come out of - what application? Everyone is different -orfice size according to engine size ect. You may need a smaller one and yes you most likely will need to readjust the idle mixture.
I sized it based on an early 70's 250 6 cyl - closest size to my 239 with the style of fittings I had available. I did find a lot for small 4 cyl's that had the same configuration - I'll try adding a bit of restriction first, then maybe swap for a smaller one.
there are two types of pcv besides orfice size one draws through one way the other does not check them by sucking on the valve in the direction of flow
Finally had some time to get back to my little dilema. I've ended up putting a restriction in the hose (threads rod with a hole in it), and have been able to get things running again. The size of the restriction is 3/32". There still seems to be a good vacuum. Is this size still to big, or not big enough ??
It's difficult to tell you the correct size since those engine never has PCV, but if all the the vaccuum accessoiries run OK (wiper, distributor advance) you have found the right restriction size.
Fitz.
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www.FitzbackGarage.com Look for Easy Steering in your vintage Poncho, Look for the EasyDrive Power Steering System in the web site
