'04 T4R in CO

Phils4th

New member
Joined the Toyota family once again, been in the mopar world for a long time but needed a safe family vehicle and picked up a 2004 limited, 4.7. 113k. Came from NY so lots of corrosion but has a rubberized factory underliner that kept it at bay for the most part. Was a company suv so it had dealer maintenance it's whole life. Pretty excited to see it pass 250k one day.

Xreas works for now, but have both reservoirs leaking. Probably just junk the system and go with a good write up article on the board.

So I have to ask a stupid question but i don't quite understand what they're saying. So I have a 4wd knob and it only has 4hi and 4lo. Am i always in 4wd? Or only when you select center diff lock? And does it lock the front or back axle?


Exhaust is pretty much shot as you can imagine, needs to be scrapped, so it got me thinking. I live at 6500ft and have thought about a simple turbo setup to regain the loss. No bov, no intercooler, small turbo, used wastegate. I'm sitting at a 3 psi loss at home. If I travel to 11k ft. I have a massive power loss, 6 psi worth. I did a search but couldn't find it, if the 4.7 of mine has an Ecu that can handle boost pressure??? Apparently they have the same ecu as the supercharged 4.7??? I would only be charging say..2psi over fair day at sealevel. That would be 5 psi rise at home. Hot side I'd love to just run the turbo off one manifold or do a crossover pipe. I'll have to look at some turbo maps and see what I can come up with.
 
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Quick primer on this, but you should do some more reading. The owners manual is a good place to start.

4th gen V8 is always in 4wd - called full-time 4wd. You only have two choices, Hi range or Lo range. It has a center differential so that there is no binding on dry pavement when turning - it allows the front and rear drive shafts to turn at different speeds if necessary.

The center diff lock locks the center differential, so that both the front and rear drive shafts turn at the same speed. This should only be used in low-traction situations. (snow, ice, dirt roads). The front and rear differentials are open - no locking whatsoever.

Activating the center diff lock also turns off VSC (vehicle stability control).

Traction control is a standard feature and will automatically use the ABS system to limit wheel spin and transfer power to the wheel with more traction. Some like it, some don't.
 
Traction control is a standard feature and will automatically use the ABS system to limit wheel spin and transfer power to the wheel with more traction. Some like it, some don't.

That's not traction control, that's A-TRAC right? A form of traction control I suppose. OP, do some reading on A-TRAC, it's an effective user-friendly alternative to diff lockers these Toyotas come with.
 
Thanks Ron, read the manual but wanted to get a simplified version. Sounds like a good system.

Any clues as to the ecu being able to accept a little boost? Surely Toyota and other companies have designed the ecu to not completely shut down when map is a little over 100kpa due to weather, temp, ram air, etc.
 

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