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.
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?
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.