Gevo

Funny thing, yesterday I used this thread to reconnect some of the hoses. I took video with my cell of everything I disconnected, but that sd card blew out before I backed it up.. lol.. technology

sphealy

iTrader: (1)

Just wanted to say thanks for all the great info I have found in less than 5 minutes from you guys. I just picked up a 1991 4 runner with 175000 miles and its only issue is horrible idle/throttle response and wet spark plugs. I think someone may have mixed up the vacuum/fuel lines from reading these post. Hopefully will have it running tomorrow.


Thanks again

Herkdriver

Subscribed. The FSM has a couple of very good diagrams, but some things, like the power steering vacuum hoses, are left out. I come back to this thread again and again whenever I have to work on the truck.

sphealy

iTrader: (1)

Alright this is what I have guys. 1991 4 runner 3.0 all stock from what I can tell. I picked it up for a grand. The body is great shape no damage. Paint is faded... its a 1991. Interior it great shape too no cracks and nothing missing except for the interior light cover. The engine runs horribly rough which is why the guy got rid of it. He purchased it with the same or similar problem from the original owner and had a NAPA guy throw some parts at it which resolved the issue for a short time. I checked the plugs and they were all pretty wet with gas, dried them off and read through a few threads. Checked a few vacuum lines. No gas came from wrong holes. Started engine and it ran "better" but not right and then started connecting the hoses back one at a time. #5 PS pump almost kills it so I left it off. Then I pulled #1 plug wire to see which cylinder is missing or not firing at all. #1 killed it. Restarted and pulled #3, no difference in current poor engine performance. Checked spark out of #3 which appeared 10-4 so I'm assuming start with plug change on that cylinder and see what happens. Any other ideas of common issues? Yes I know that changing the plugs aren't the problem but I'm assuming it will assist in trouble shooting. Thanks for any ideas/help.

jbtvt

Here's the missing/labeled image from page one -

rjtrials

I just bought and 89 pickup with a 95 3VZ-E engine swap that wasn't done perfectly. This thread helped me sort out most of the vacuum hose shenanigans!

A couple questions regarding the AC idle up ports. on my engine both port 4 and 6 have an extra arm like 5 & 13 setup. any idea where these are supposed to lead? for convenience sake (and that the AC doesnt work) i blocked off 4 and 6 and took off the AC idle up. the engine runs better with 4a and 6a routed to each other than with both of them blocked off. any suggestions?

as a side note. the engine runs super rich so sorting out these hoses was a first step. the truck runs much better, but not great yet!

RJ

IsaiahMastrianna1

What line connects to the plugged port right above #8? I have that tri connector on my 4runner, but the port above #8 is open, where does it connect?

scope103

All three ports on the "air filter" are the same; vacuum to drive accessories. The three share PAIR, ADD, Cruise, AC idle-up actuator, and Fuel Pressure-up. So if, for instance, you don't have Cruise, AC, or 4wd, then you will need fewer connections. The unused port(s) do have to be capped. Otherwise you have an unmetered vacuum leak, and your rig will struggle to set idle and mixture.

IsaiahMastrianna1

So I got everything hooked back up, the engine starts, then flutters out. Ideas?

scope103

... is the classic sign of a VAF-COR problem. Fortunately, it is the easiest thing on your truck to diagnose (and discussed on this forum at least once a week -- next time start by searching.)

Jumper FP to B+ on the diagnostic connector. This forces the fuel pump to run with key-on. If your engine runs now, you know where the problem is.