5.0L Intake tube

[JoshT]

Doing a smoke check on my 5.0 swap today and discovered that the tube from the MAF to Throttle Body is cracked at one end. Swap was done using a 2000 Explorer so it has the squared intake box, not the round thing. Was in the local junkyard last week and I saw no 5.0L Explorers with the square box.

Anyone happen to know what the part number for the intake tube is? I searched the Ford parts websites, but they're all showing diagrams for the older round filter box. Given that I don't trust them to be listing the right part. As such I'm hesitant to use that number to search one up through Google.

If you happen to have a good one you can part ways with, LMK and we'll see what we can work out.

Alternatively I'll be trying to seal the leak with RTV/Silicone for now and looking for an aftermarket intake tube/filter setup.

 

[toypaseo]

Send me a PM… hitting one or two pick-a-part yards next week…

 

[JoshT]

Thanks, PM sent!

If you find something in good shape and a decent price, I'm interested.

 

[vroomzoomboom]

or you can do this. get a mandrel 45 or 90 exhaust pipe (cant remember the diameter, 3 inch or what ever the opening to the throttle body is) then also 2 silicone pipes with the same id as the od of the exhaust pipe and a couple of clamps to make a pipe you need.

 

[JoshT]

or you can do this. get a mandrel 45 or 90 exhaust pipe (cant remember the diameter, 3 inch or what ever the opening to the throttle body is) then also 2 silicone pipes with the same id as the od of the exhaust pipe and a couple of clamps to make a pipe you need.

As I mentioned in another thread, that's the backup plan. If I decide to upgrade throttlebody it'll probably become primary. Given your build that is something you may be familiar with.

My intake and elbow was ported out to 75mm, the stock throttle body is 65mm. If I didn't fix the leaking throttle shaft (vacuum leak) I'm very tempted to buy and adapt an aftermarket Mustang 75mm throttlebody. Problem is if I do that I think that the MAF is only 70mm so I'd be wanting to find a upgrade for that to match.

That's a rabbit that I don't think I want to chase, unless it becomes necessary. On the flip side I'd probably rather chase it and upgrade now before getting tuned, than having to get retuned to upgrade the MAF later. That'd mean I'd have to locate a 75mm MAF that will work with the 99-01 Explorer ECU. And there I go chasing the rabbit again...

 

[vroomzoomboom]

As I mentioned in another thread, that's the backup plan. If I decide to upgrade throttlebody it'll probably become primary. Given your build that is something you may be familiar with.

My intake and elbow was ported out to 75mm, the stock throttle body is 65mm. If I didn't fix the leaking throttle shaft (vacuum leak) I'm very tempted to buy and adapt an aftermarket Mustang 75mm throttlebody. Problem is if I do that I think that the MAF is only 70mm so I'd be wanting to find a upgrade for that to match.

That's a rabbit that I don't think I want to chase, unless it becomes necessary. On the flip side I'd probably rather chase it and upgrade now before getting tuned, than having to get retuned to upgrade the MAF later. That'd mean I'd have to locate a 75mm MAF that will work with the 99-01 Explorer ECU. And there I go chasing the rabbit again...

pretty much all mustang (fox and sn95) throttlebodys have to be modified to work with a explorer. some guys cut and reweld the arm so it swings the correct way. i just made a small plate, then bolted it to the throttlebody. way easier, and if you have to sell it, you can undo everything you did. if you want to go used, corral.net is a great mustang site for parts. but i would take care of that vacuum leak first because it will throw your tune off. also the size of your throttlebody i dont believe affects the size of your MAF, now if you changed the size of your injectors thats a different story.

 

[JoshT]

pretty much all mustang (fox and sn95) throttlebodys have to be modified to work with a explorer. some guys cut and reweld the arm so it swings the correct way. i just made a small plate, then bolted it to the throttlebody. way easier, and if you have to sell it, you can undo everything you did. if you want to go used, corral.net is a great mustang site for parts. but i would take care of that vacuum leak first because it will throw your tune off. also the size of your throttlebody i dont believe affects the size of your MAF, now if you changed the size of your injectors thats a different story.

Leaks are definitely first priority and no tuning is required for throttlebody replacement or upgrade.

I know the throttle lever/arm needs to be modified. I was figuring to attach a plate like you mentioned. I wasn;t sure if the explorer throttle position sensor would work. I'd love to go used if the prices is right, but I was actually thinking even cheaper. One of the chinese import units off of Amazon or eBay. A throttlebody is a simple enough piece of equipment that I don't think they could mess it up too bad. May not flow as well as a BBK, SCT, etc, but likely to flow better than stock and not have the port mismatch. Should work fine as long as good sensor and IACV are attached to it.

The stock 65mm throttlebody will flow more than enough air to support all the power that the engine will make. The main gain to installing a bigger TB is faster throttle response, and according to the numbers that porter provided the intake will outflow a 75mm throttlebody. The concern is that the 70mm MAF being a restriction at WOT if I did install a 75mm TB.

Since I'm having the truck tuned, probably by Lasota, the MAF "calibration" and injector size shouldn't matter. Both can be taken care of in the tune. Having said all of that, If I think that a larger MAF is going to be desired, it is something to consider now before I get tuned. If I do it after the tuning window, I would have to pay for a retune to change it later. In fact it may be desirable to upgrade the MAF now as a precaution and upgrade the TB later if desired. Now I'm going down the rabbit hole...

BBK sells a 76mm & 86mm MAF that is "calibrated" for 19lb injectors. The 76mm is for 94-95 5.0L and 86 is for 96-98 or 99-02 4.6L. Pro-M also sells a 76mm calibrated for 19lb injectors for the 94-95 5.0L. The sensor in them appears to have the correct pinout for the 99-01 Explorers. The stock Explorer uses 19lb injectors. I'm wondering if this could be used as a direct replacement "upgrade" for the stock Explorer using the stock tune. Alternatively, If I have it tuned by Lasota on the stock MAF, could that be a bolt in upgrade without retuning. I've got some more questions to ask and research to do.

 

[410Fortune]

Don’t forget the 6 wire mas has the iat built in
So you will need one of that style or you will have to add the iat back into the intake tube and wire it up

 

[JoshT]

Don’t forget the 6 wire mas has the iat built in

I did consider that. The ones I mentioned are all 6 wire sensors like mine, they are sold with an adapter to convert to 4 wire for the Mustangs. That is one of the things that has me wondering if they can work as described.



Continuing to chase that rabbit...

Another option may be an 80mm MAF from a 1999-2000 Lightning. I would have to run it with a tune, but it's apparently cheap compared to aftermarket. It'll bolt to the factory air box and fit the factory tube. It's also black plastic like the stock one, so would be indistinguishable from stock unless someone really knows their Explorers. The problem with that is finding one, per my reading a lot of the replacements are the bigger 90mm from the 2001 up models. The listings for the replacements don't seem to list a diameter.

 

[JoshT]

To continue updating, it looks like the 80mm Lightning MAF is a no-go for the 1999-2001 Explorers, but might work for earlier with an adapter. The sensor looks like a 6 pin, but it doesn't actually have the pins for the ACT sensor. The 90mm would be a workable upgrade with a tune, but what I've read suggests that it won;t fit the factory intake tube, and the air box may not have enough material available to open it up to match. Maybe if you're willing to go custom tube and cone filter, but I want to keep the airbox and stock style tube for appearance if possible.

Appears that aftermarket is going to be the ticket for me. If I decide to carry forward with this I either need to pick one to install with the tune, or have Pro-M set me one up for the stock ECU.

As I think about it, I'm getting more serious about doing this before the tune, even if it means pushing the tune off a little longer. I'll try to take a good look at the air box in the next day or two and try to determine if an 86mm can be fitted easily, or if the 76mm would be better.