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Air filter intake duct (Options)
#762039 June 07th 2020 6:58 pm
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So I was wondering what people have found to replace the tubing that would have been on the air intake duct that comes from the air filter and t's off to the electronic box on the firewall. The plastic parts I have are in good shape but I am having a hard time finding any 3 1/2" ducting to rebuild. I have purchased some 3" plastic tubing pictured and 3d printed a reducer but not really sure how well it will hold up in the long run. My next trip to Home Depot will hopefully yield some kind of ducting but I feel it will be only available in 3" and 4". Any insight would be helpful

Attached Files 61EvzumVfwL.jpgCapture3254.JPG
Re: Air filter intake duct (Options)
computerfix619 #762042 June 07th 2020 7:18 pm
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Would clothes dryer vent hose work, or flexible plastic drain pipe. Surely a van setting in a scrap yard somewhere with the duct hoses.

Re: Air filter intake duct (Options)
computerfix619 #762045 June 07th 2020 7:27 pm
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https://www.mcmaster.com/flexible-duct-hose/id~3-5inches/

Re: Air filter intake duct (Options)
computerfix619 #762048 June 07th 2020 7:46 pm
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Check out O-Reilly Auto Parts, Gates 3 1/2" hose, Part #23856

Re: Air filter intake duct (Options)
computerfix619 #762050 June 07th 2020 8:08 pm
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Looks like mcmasters will be getting a call tomorrow. Thanks

Re: Air filter intake duct (Options)
computerfix619 #762056 June 07th 2020 9:08 pm
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Love browsing Mcmaster-carr. Great catalog, but sometimes hard to post links to.
Like the fast delivery.
The shipping fees, always significant, unknown until after one places order, not so much.

Perhaps that's changed in the last 10 years since I last placed an order with them.

Re: Air filter intake duct (Options)
Meanmachine #762061 June 07th 2020 11:09 pm
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I ordered based on this part number I will have the parts in store tomorrow and then be able to better know what will work. Thanks for the part #. Google was not helping me on that one at all.

Re: Air filter intake duct (Options)
computerfix619 #762253 June 13th 2020 4:17 pm
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Just a follow up to the initial post. Remade the intake hose and hooked up the lean burn tubing on the firewall and the van drives 100% better than previously. Super smooth acceleration with no sputtering at all. Next up is oil change spark plugs then SMOG inspection.

Re: Air filter intake duct (Options)
computerfix619 #762261 June 14th 2020 2:40 am
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Best of luck with the smog test. Set an appointment, and get the new engine oil good and hot. Lots of smog test centers got rig of their ability to test OBD1 or earlier vehicles. the remaining have raised their prices. Offer to take off the engine covering and have it off to the side, so the tech does not have to do it. They charge extra for vans because of the engine cover potential pain in the ass removal and return time consumption.

Also make sure the battery is totally and completely charged, so it cant accept much amperage from alternator, atwhatever voltage the regulator is commanding, and increase load on engine during the roller/sniffer test.

Running some gumout regane or redline SI-1 through less than 15 gallons before the smog and oil change will likely help it run cleaner.

Would love to see pics if you fabricated new Air hoses. Mine are all beat up, and perhaps restrictive or allowing some
warmer underhood air into the tube than there should/could be.


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