Vman's AR-kanuck Runner

[Dr.Maxwe001]

shot in the dark here but could it be the fuel pump in the tank ?

[IronClad]

EFI relay ? ( kick panel) TPS issue?

[V-Man]

shot in the dark here but could it be the fuel pump in the tank ?

Did you replace the filter?    I think you did...

You turn the key the fuel pressure is built up by the fuel pump in the tank, but it can't move enough fuel to keep the pressure up..Truck stalls..

[IronClad]

could be fuel pump if that is what it is doing or even possibly a bad ground to the pump. ive had that problem before in both my toyota and my ford.  Toyota pump was just dieing and the ford had a ground issue

[Oddmar]

We had a terrible problem with an 84 carbed truck falling on it's face after a few minutes, changed EVERYTHING, gapped valves, reset distributor timing, timing chain, fuel pump, fuel filter, different fuel tank.

Finally i got a new length of hard fuel line and that fixed it. From the tank to the fuel filter.

[4LoRunner]

i am goin through the same exact problem as we speak it. mine was running fine tuesday night and came out to fire it up yesterday afternoon and on runs for 3 secs and cuts out. checked fuses, fuel press., spark, timing, ecu. i have a feeling that the ignition system is loosing power

[Dr.Maxwe001]

the reason i said the fuel pump is due to the fact that IF the ECU see a problem SOMEWHERE ie: bad ground or loose wire  it will kill the signal going to the fuel pump for sasfty reasons  IT COULD also be that the sock at the fuel pump is cloged but i know on my 02 z71  last summer the truck would gurggle a little and then loose power and die  i would crank it backl up and some times it would run and some times it wouldnt and I would have to coast a little ways and let it sit and then it would fire up and be fine sooner than later I had to put it in the shop and put a new fuel pump on it

[79coyotefrg]

ok, my heads not killing me now so,

we swapped the afm with a KNOWN WORKING one and it made no difference

we swapped fuel pumps to a KNOWN WORKING one,

tank is clean

fuel filter replaced

tps is questionable.  as well as that big "flat screw" on the throttle body.  how are these adjusted??

injector relay thingy on pass side inner fender was swapped with a working one, no change

I remember WAY back when this first started before/when i put the carb on it the #1 and #3 injectors didnt pulse BUT it wouldnt run at all then and it will run for a short time now.

[79coyotefrg]

oh, and i crossed pins T and E1 with a paper clip and timed it to 5*

distributor was questionable so again  i swapped for a known working one.  dont tell Vman

[Sparkplug]

flat screw on tb should be all way in, its the idle screw, tps needs to be correct year, and they can cause weird probs. But in all my yrs of toyotas I have seen ALL run with the tps completely unplugged. Was the afm u put in from the correct year truck?Have you checked fuel pressure? When it does its thing, crack the csi, and see if it sprays.

[79coyotefrg]

flat screw on tb should be all way in, its the idle screw,

ok, will screw it in all the way

tps needs to be correct year, and they can cause weird probs. But in all my yrs of toyotas I have seen ALL run with the tps completely unplugged.

it was from a 86 4runner didnt make any change so i swapped it back to the 88

Was the afm u put in from the correct year truck?

no it was from a 86 runner

Have you checked fuel pressure? When it does its thing, crack the csi, and see if it sprays.

no way to check pressure BUT when it dies i cracked the csi and got sprayed in the face.

[Sparkplug]

88 IS A STAND ALONE YEAR

I own a 88 4runner, most parts will only work if they are 88. I know for sure the injectors, and the harness are different. And im 99 percen sure the tps and afm WILL NOT work correctly if they are not from a 88.

[V-Man]

oh, and i crossed pins T and E1 with a paper clip and timed it to 5*

distributor was questionable so again  i swapped for a known working one.  dont tell Vman

  I think some one is swapping parts again....


Got to make it work right.. ..  Just gives me a reason to buy a solid state distributor for it..

[79coyotefrg]

  I think some one is swapping parts again....


Got to make it work right.. ..  Just gives me a reason to buy a solid state distributor for it..

thats the crazy thing, it all works fine on the orange crusher, but dipidy on the 88

[79coyotefrg]

88 IS A STAND ALONE YEAR

I own a 88 4runner, most parts will only work if they are 88. I know for sure the injectors, and the harness are different. And im 99 percen sure the tps and afm WILL NOT work correctly if they are not from a 88.

[IronClad]

also check the EFI relay on the fuse block in the drivers side kick panel! could be acting funny

[Sparkplug]

First thing to do is make sure u have all the original 88 parts back on it, or you will never get it right no matter what you do.

[79coyotefrg]

gotta install some bearings in my alternator then i'll tackle that

[79coyotefrg]

well Ive given up,  i'm going to make sure all the parts from the 88 are on the 88 then its for sale.  $1500 as is.

[Oddmar]

Do what you want to with it, of course Glen, but...

I'll be down there on the 11th or 12th , when we get back from Gilmer i'll look at it.

[79coyotefrg]

ok Jake, you're right.

[79coyotefrg]

well, while looking for some wire today I stopped to gaze under the hood and noticed the injector transformer thing on the pass side fender wasnt plugged up.   I plugged it in and it ran for a couple minutes I was getting out to put some coolant in it and it died.   I went ahead and got some coolant in it but not full, then started it again.  it ran flawlessly for about 2 minutes then started to stumble, i gave it gas and it revved but started missing but when it missed the dash lights flashed.  so I ask?  WTH is up with that??

[Sparkplug]

I swear, i think ur CSI is running the truck, I think its the AFM man

[twistedtoy92]

put a jumper wire in the diagnostic box from B+ to FP and see if it will stay running.

[79coyotefrg]

yes i changed back to a efi distributor

i could rev it to 3000 rpm  it wouldnt do that on the cold start injector correct?

[79coyotefrg]

put a jumper wire in the diagnostic box from B+ to FP and see if it will stay running.

i'll do that tomorrow

[twistedtoy92]

I had to do that on my 89 xtra cab, my first yota (rip)..... ran it for a few months like that untill I had the money to take it into shop before I really knew anything about injection.. Ended up being the arm in the AFM was tweaked enough to were it would run for 30 seconds or so then die... I put alot of money into it myself before I took it to the shop and it took the mechanic 2 weeks to figure it out! 

[Dr.Maxwe001]

   

[KDXSR5]

Jeff told me to pop in.

First of all, do not put that idle screw all the way in. My 85 wont even idle with it all the way in. It cuts off too much air. Just turning it a quarter turn will change my rpm by almost 200.

Second, like said before, make sure you have all the 88 stuff on it. 88 is an odd-ball year with a lot of 88 specific parts. Hard parts can be swapped to other years, but the electronics . . . not so much.

Third, I really think you should find out what the fuel pressure is. Autozone and Checker used to lend fuel pressure gauges, although I don't know if they still do or not. Things have changed at the auto part stores in the last few years. Another option is taking it to a local high school if they have an auto program. They may be willing to hook one up to it. You will probably have to cut the fuel hose to put the pressure gauge in there because I am pretty certain my old 88 did not have a valve anywhere to hook a fuel pressure gauge to.

If the pressure is low (I think it is supposed to be between like 35-40, but DO NOT quote me on that as it has been a LONG while since I have looked it up), then you may have a weak fuel pump (unlikely since you tried a different one already), corroded hard lines, or internally disintegrated soft lines. The last to can clog a new filter FAST.

The pressure regulator may be acting up. Those cause some screwy things when they go bad. They are not cheap to replace last I looked.

In the FSM, there are ways to test just about every sensor on the engine, IIRC. If you can get a hold of an 88 FSM, I think it would be very beneficial.

Aside from making sure everything is plugged in an all hoses are in good condition and in the right locations, I don't really have anything else at the moment. Let us know what happens.

[KDXSR5]

Oh yeah, I know you know your ways around these motors . . . BUT how sure are you that the gear timing is right? If you are off one tooth, it will run like , die a lot, and the distributor will be right at the end of its adjustment when the timing is right. Don't even ask how I know all this, it was a painful learning experience.