Hello! I've just started to begin to do work on my 4Runner, starting with redoing the front end (replaced the original ball joints, axles, and shocks) and also doing the ISR mod. What I did was take a small 90* PVC angle and replace the angled box. I made a plug where the ISR box out of PVC as well. I put a nipple in the angle of the 90* for the vacuum line:


Works great, most of the time. Sometimes after a cold start or coming to a running stop (i.e at a stoplight) the idle dips down to 700. I'm not sure if its a leak since it comes and goes, but I had a leak with it once when my pipe clamp came loose, that was a very obvious issue (idled really low, loss of power, etc). Right now, I am stumped. The only reason why I'm worried about it now is because I'm camping later this month, don't want it dying in the middle of nowhere.

 

that box is more of an oil catch, so i would check for oil in the vsv.

 

Interesting, I wondered what that little hole was for. Not sure, but would having oil in the VSV constantly be bad? Fixing this is now the lowest of my priorities, the truck's rad fan blew up yesterday taking out the power steering hose and radiator hose.

 

Do yourself a favor and pickup a fan for a 94-95 4Runner 3.0L that doesn't have that outer ring around it, Toyota part number 16361-65020. Over the years, I've read lots of accounts of people having their fan, with that outer ring, explode and essentially do exactly what happened to you.

I have no advice or input on the ISR low idle issue, other than when I did mine I replaced all the rubber intake tubes with a section of 3" exhaust tube and never had a low idle. For what it's worth, the 3.4 I have now consistently idles between 600-800 rpm when warm (but that's a completely different engine and ignition system, so its really an apples to oranges comparison).

 

Thanks for the fan advice, now I just need to track down a power steering hose, I see three, but I need the right one
Luckily, the fan you suggested is in stock at AutoZone close to me! I could be driving it to work tomorrow. Last question, would I need to buy a new fan clutch, or will this one bolt right on?

It hasn't died on me, I just didn't know how low the idle would be fine to go. I was driving a rental GMC Yewcon and it idled around 500RPMS, so I'm not too worried now.
The only reason why I used a PVC setup was just the price, I couldn't find a reasonable muffler shop to do it for me.

 

It should work with your existing fan clutch. I swapped that 94-95 3.0 fan onto my 91 3.0 fan clutch, then mounted the whole assembly onto a 97 3.4 and haven't had any issues in 3+ years.

 

well, you say it does it when it's cold. oil can get a little sticky when it's colder, so just something to check.

 

It worked perfectly, thanks for the recommendation.
Hmm, maybe so. Like I drove it (on a date ), ate ice cream, watched a 2Hr movie, and then turned it back on, wouldn't it be cool by then?

 

Ok, wondering if I could drill another hole in my PVC elbow, then have a closed tube in the hole to catch oil.

 

like a drip leg in your natural gas or air systems? it could work. i would probably do at least 3/8 orifice for the oil. i just ran a self-tapper in the bottom of my stock one and use it as a drain plug at oil change time