Choosing an appropriate PVS for a Howell TBI

I only posted here once a while ago and thought I’d follow up on some California emission confusion.

So, my pieced-together '84 CJ7 has both the Painless #10150 installed and the #CA/JP258 EFI installed (the Jeep was a basket case and had to be built). The most recent problem is compliance with Nor-Cal Bay Area emissions. The engine has the OEM dual port PVC in the manifold, but the Howell diagram clearly shows a five-port, of which only four appear to be used. I cannot, for the life of me, find that part (PVS61) anywhere online in stock… at all. :weary:

What I have found are a few others as candidates. The PVS53, the PVS63, and the PVS151 appear to have the correct thread pitch (3/8-18) with a quad port for vacuum. Being the closest to the original design, have you guys had any luck with alternate options to use for the Howell TBI setup?

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I’ve faced a similar issue with my ’85 CJ7. I ended up using a PVS53 and it worked out well. It’s a bit of a workaround, but it should fit and function with the Howell TBI setup. Just make sure to double-check the vacuum lines to ensure proper connection.

Replacing the elusive PVS61 in your Howell TBI setup requires careful attention to several factors:

  • Port Configuration: The PVS61 features a quad-port design, so any replacement must match this layout.
  • Thread Pitch: It’s essential to ensure the replacement has the correct 3/8-18 thread pitch for a proper fit.
  • Vacuum Requirements: The replacement must be capable of handling the vacuum levels produced by the Howell TBI system.

Potential Alternatives:

While I can’t guarantee compatibility without more details about your engine and setup, here are some options to consider:

  • Aftermarket Performance Parts Suppliers: Look for companies that specialize in performance parts for classic vehicles; they might offer suitable replacements.
  • Custom Fabrication: If you have access to machining or welding facilities, a custom PVS could be crafted to fit your needs.
  • Consult with Howell EFI: Reach out directly to Howell EFI for advice or potential replacement options.

Important Considerations:

  • Vacuum Leak Testing: After installing the replacement, thoroughly check for vacuum leaks to ensure proper engine function.
  • Tuning Adjustments: You may need to adjust the engine’s computer settings following changes to the PCV system.
  • Emission Compliance: Verify that the replacement meets local emissions regulations.