Does anyone have any vacuum harness from any 2.8 V-6 or 3.1 V6?

[89-W-Body-Regal]

Hi, I am looking for this vacuum harness or the throttle body connector from any 2.8 or 3.1. But W-Body’s will help. If you can let me know if you got any I would appreciate it. I am in the process of rebuilding my harness because the plastic line is cracking badly.

The connector at the throttle body is toast. I cannot locate one.

Here is a photo of one intact.

Edited November 20, 2022 by 89-W-Body-Regal

[kcac]

What years will work for you? I have some parts from a 1990 Chevrolet Beretta that had the 3.1L engine. 

[ManicMechanic]

3 hours ago, kcac said:

What years will work for you? I have some parts from a 1990 Chevrolet Beretta that had the 3.1L engine. 

I think Beretta used a 3 port. He needs a 4 port which W bodies used.

[89-W-Body-Regal]

On 11/20/2022 at 2:24 PM, ManicMechanic said:

I think Beretta used a 3 port. He needs a 4 port which W bodies used.

What do you mean by ports? 

[ManicMechanic]

20 hours ago, 89-W-Body-Regal said:

What do you mean by ports? 

W bodies have 4, N-L bodies only had 3.

Edited November 24, 2022 by ManicMechanic

[ManicMechanic]

[89-W-Body-Regal]

18 hours ago, ManicMechanic said:

W bodies have 4, N bodies only had 3.

Yes that’s exactly what I was thinking when you say that. Thanks for confirming

[ManicMechanic]

39 minutes ago, 89-W-Body-Regal said:

Yes that’s exactly what I was thinking when you say that. Thanks for confirming

A bodies are 4 port too, so there's another avenue.

[89-W-Body-Regal]

On 11/24/2022 at 9:56 AM, ManicMechanic said:

A bodies are 4 port too, so there's another avenue.

Yeah I need the Tbi connector really bad or it's gonna start leaking. The hard lines I am not using anymore. I am going to use rubber hose line.

Someone on facebook in the fwd group we are in said auto parts stores used to sell them. But they are so hard to find. I wish dorman would make them. They make the elbows. I got two packs.

Edited November 27, 2022 by 89-W-Body-Regal

[92rs3.1]

On 11/20/2022 at 9:11 AM, kcac said:

What years will work for you? I have some parts from a 1990 Chevrolet Beretta that had the 3.1L engine. 

Hey do u still have parts ?

[Georgie]

On 11/20/2022 at 11:11 AM, kcac said:

What years will work for you? I have some parts from a 1990 Chevrolet Beretta that had the 3.1L engine. 

 

If you still have the harness from beretta I’d buy it from you 

[babyteef]

i have the rubber connector for the vaccum harness from my 89 2.8 v6 corsica, i’m looking for new hard lines for the vacuum harness now, one of mine has a hole, i can buy the lines if you still have them since you’re going with softer ones, maybe we can trade parts 

[GnatGoSplat]

Dorman does sell universal hard vacuum tubing.  You can probably bend it to shape with a heat gun.  Years ago, I just put heatshrink tubing over the cracks.  Looked like an obvious fudge-fix, but worked fine.

[babyteef]

14 hours ago, GnatGoSplat said:

Dorman does sell universal hard vacuum tubing.  You can probably bend it to shape with a heat gun.  Years ago, I just put heatshrink tubing over the cracks.  Looked like an obvious fudge-fix, but worked fine.

that sounds awesome i’ll check that out thanks man, picking up a 98 integra thursday , hoping to have the corsica running as soon as i get that harness connector 3d printed (hmu if needed for that 4 port my buddy is making a model for me)

[89-W-Body-Regal]

I have the rubber right now but a critter got into my engine bay and chewed some of it off. So I am going back with the plastic tubing. I am going to use the nylon vacuum tubing. It’s flexible and it’s by Parker. Just trying to locate them. I am not sure is our lines 1/8 and the thicker line in the middle 1/4?

Edited June 10, 2025 by 89-W-Body-Regal

[4doors4flying]

would any one know how to get a 3 port vacuum harness? ive got a 93 Buick regal with a 3.1 multiport Fi and i need a 3 port. i cant find any parts diagrams anywhere with a 3 port, and no junkyard within 30 miles of me even has an old 3100 engine that i can look at. ive found plenty of 3700 and 3800 of different makes and models, but none even have a 4 port harness. mine was badly rotted from never being touched for 30 years and ive lost powered brakes, my ac selector no longer works and my power steering locks up whenever i give it around half or more than a half press of my brake peddle, causing me to almost crash every time i have to make a turn without stopping fully. im going mad trying to search for it, every idiot behind a parts counter at every auto parts shop have no clue what im talking about and i can not for the life of me find a part number for a 3 port, i cant find any diagrams with a 3 port, and no one sells anything but a "do it yourself kit" with hose barbs and universal hose i have to cut to length

[GnatGoSplat]

I didn't find any other part # other than 10087630 for a 93 Regal with the old "3.1 MULTI PORT FI".  Is it the original engine?  ManicMechanic mentioned above Beretta got a 3-port.  I found the Beretta p/n is 10146861.

If the rubber block is badly deteriorated, might just have to use a lot of RTV to fill it.

A quick Google search and I wasn't able to find generic rubber hose barbs either.  A couple ideas off the top of my head (no idea if they'd actually work):
1. Find some hose with the OD approximately the size of the holes in the TB, and ID approximately the size of the plastic tubing.  Shove the plastic tube into a short piece of hose and shove that hose into TB.
2. You could try one of those press-fit O-ring ends into the TB with a barb on the other side.  I'd guess they come in different sizes, though that'll probably be hours of research to find them in the right sizes.

3. Or a non-reversible solution could be to tap out the holes in the TB piece and use metal threaded ends barbs.

Although in both cases you'd need a short length of rubber hose to connect it to to the existing plastic vacuum lines.

I would probably try my idea #1 first.

Edited 53 minutes ago by GnatGoSplat