Outer Limits 4x4 Board

Just put a motor in my son's 4runner as temporary measure while re build his. His motor has done a crankshaft bearing - the motor I just dropped in was out of a wreck but was going OK.

The problem I have is I can't get the idle below 1000rpm.
I've backed the throttle stops off as far as I can but still can't get the idle down.
It is also blowing excessive black smoke which it was not doing in the wreck it was pulled out of (so I am told). It could be the oil he has put in the new motor - not sure what it was but knowing him it would have been the cheapest he could buy.
I noticed there was a slight difference in the fuel pumps - the old one was very basic with nothing hanging off it.
The new motor out of the wreck has some extra bits - looks like a vacuum setup on the side.
I blocked off the vacuum but it doesn't seem to make any difference blocked or not.

Any advice / help much appreciated - thanks

You sure its a 3L ? or a 3L with a 3L pump? The extra stuff on the pump maybe a boost compensator ie 2LT pump.

I'm an 80's Cruiser nut so this Hilux / 4runner / surf stuff is new to me.
It was sold to me as a 3L.
The block looks identical to the 3L I pulled out.
There were a few differences - the oil cooler cover was different - filter was in a different direction but basically the same.
I swaped them over as the one out of the wreck was leaking.

You may be right - maybe it's not a 3L or the pump may be out of something different but the motor was pulled out working - I realy don't care what it is, I only want it last long enough for me to rebuild the original motor.
If I could get it to blow less black smoke and idle lower it would put less pressure on the time I have to rebuild the old 3L.

Thanks

if its a boost comp it will be on the top
if the bits on the pump are on the side it may be a timing advance (i think) that uses coolant to control it. i think you can just pull it off and plate the hole up.

also pull the crank vent off to test its not running on engine oil via the vent.

Yes it is on the side - looks like some sort of vacuume advance so I',m guessing you're spot on.

also pull the crank vent off to test its not running on engine oil via the vent
Can you explain that a bit for me?
Thanks

the vacuum line your talking about off the pump sounds like it is the air-con idle up shouldnt affect idle, did you try backing off the fuel flow screw that affects idle.

yeah id try backing off the fuel screw abit sounds like its eating to much fuel. or it could be running on a bit of oil, like old mate said, make sure it isnt sucking oil from the crankcase, into the inlet, there should be a breather hose on top, disconect it. is it a 2.8 or a 2.4?

lovinloren wrote:did you try backing off the fuel flow screw that affects idle.

That's what I'm not sure of - which is the idle screw on the pump?

Thanks

james0 wrote:yeah id try backing off the fuel screw abit sounds like its eating to much fuel. or it could be running on a bit of oil, like old mate said, make sure it isnt sucking oil from the crankcase, into the inlet, there should be a breather hose on top, disconect it. is it a 2.8 or a 2.4?

It was sold to me as a 2.8 3L.

Where is this breather hose and where does it go from / too?
Is it needed or do I permenantly block it off?

Thanks for your help.

it is needed, it runs from the tappet cover to the inlet manifold, shoul be half inch thick, if its blowing oil from the engine into the inlet it will be running on the oil making it rev higher, should be a threaded screw in the backish of the fuel pump try winding it.

james0 wrote:it is needed, it runs from the tappet cover to the inlet manifold, shoul be half inch thick, if its blowing oil from the engine into the inlet it will be running on the oil making it rev higher, should be a threaded screw in the backish of the fuel pump try winding it.

id try that is all i can think atm. hope all goes well!! lets us know what the outcome is

Thanks a lot - I'll give it a try on the weekend and let you know how it goes - cheers

Did the 2nd hand motor come without exhaust manifolds and did you see what it come out of, if they had a turbo fitted on that motor then the fuel would be around half to 3/4 a turn too rich. But definately sounds like pump issue

Ah - yes he did say they had a turbo fitted to it - that sounds like it might be the problem.
Now all I have to do is find out which screw to screw!
There was no exhaust manifold with it although I did get a carbie in the box of bits

the fuel screw at the back of the pump is the max fuel setting. it doesn't do anything with the idle. apart from the the throttle stop on the top, the idle setup is all inside the pump, not really user adjustable.

why not just fit the pump from the old motor?

That throws a spanner in the works - I thought I could adjust the idle with that screw.
I figured there would be less problems if I just kep the pump that came with the motor - after all it was running fine with that pump previously, although it did have a turbo at some stage - not sure of the details.

That is my next option - swap the pumps over.
I'll try it all this Sunday when he brings it back over - he is driving it around now we got it registered.

Thanks

tweak'e wrote:the fuel screw at the back of the pump is the max fuel setting. it doesn't do anything with the idle. apart from the the throttle stop on the top, the idle setup is all inside the pump, not really user adjustable.

Really? When I turboed my old engine I had to turn the idle down everytime I turned the fuel up.


This is the fuel screw: (in red)

308 is on the money, that screw will aply more fuel to the engine, i can twist mine on my ln106 and it will make the idle go up, tried it 10 mins ago.

been ages since i looked at my 3l, had a quick look at the books. i think the max fuel screw changes the start point rather than the end point.

sure he could wind the screw back but that would reduce max fuel and make the vehicle slower. i assume its not pouring black smoke out, if it is then certainly wind the fuel down.
in any case a simple adjustment of the idle stop on top of the pump should fix it. as that hasn't fixed it, its most likely another issue.
either running on oil, or internal problem of the pump.

Could also be an injector thats faulty and just dumping fuel into a cylinder.
That was my problem i had, it was blowing a lot of smoke when it was a n/a motor then i turbo'd it and it was blowing white/blue smoke at idle which turned out to be a faulty injector.

He bought the truck over today so we did a bit of tweeking.

I backed off that screw on the pump - had to back it off almost a full turn till the idle dropped to 700rpm.
Took it for a drive and the smoke is gone - not a whisper under load, backing off or at idle and not noticable difference in power.
Not sure what the idle should be set at but it sounds about right - I'll see how it goes but might lift it a bit with the idle stop screw.

Thanks to all those that helped out - I think it is a good result.

If you're not sure if it's a 3L or not, check the engine number. It will say 3L amongst the other numbers. I think that it maybe even the first two numbers, but I can't remember for sure.

What have you got to lose, screw it out half a turn (leaning it) and if it solves the problem your laughing, if not then simply screw it back in half a turn. Running it just that little bit leaner wont hurt but if your running too rich that can cause you dramas.
Give it a go it wont hurt.