1986Yotaboy

So, my 1986 Toyota 4runner with a 22re is running extremely rich, and doesn't idle well by any means. I have searched the site up and down, and haven't found anything to be very helpful, so i decided to ask directly for some help.

Here is what is happening:
I start the truck and it runs crappy right off the start. It is running extremely rich, and I just swapped out the AFM with another one, and both are within spec on an OHM meter. The O2 sensor is fine, and now I am stumped. Rotor cap and spark wires+plugs are fine. So what do I look for now? I have a buddy with a new computer that I can get, but is that where my problem lies? I pulled the codes, and they all say "or the ecu", which is what makes me think its the computer. This just started happening in a nights time, and I miss not being able to drive my yota. Please help me!!!


Thanks

rowdy235

what do the codes say before the "or the ecu"?

Run some seafoam through it. Search if you need instructions.

84sr5yoty

Sounds like a bad coolant temperature sensor to me (Toyota calls it a water thermo sensor.) There is a way to test using an ohm meter in contrast with the temperature of the coolant.

1986Yotaboy

sweet, I actually just ordered that, so we'll see if that helps. thanks

1986Yotaboy

Well, so I changed the thermo sensor, and all spark plugs, plus a new 02 sensor, and have used two afm, and neither have seemed to change the running rich. I drove it up the street, and it seems powerless. It also doesn't idle very well either. any tips?

rowdy235

powerless and bad idle seems to me like timing or maybe valve lash. Don't know if that would help the running rich but its worth a shot.

84sr5yoty

Could be a bad fuel pressure regulator. A quick and dirty test is to pull the vacuum line off of the regulator while the engine is idling and see if any gas comes out of the regulator. If it does, it's toast.

rdharper

I doubt its the ECU, simply because in the years of following this forum, I've never heard of a bad ECU... not that it can't happen... I had a bad ECU on my Rx7 which was caused by leaving the sun roof cracked open during a serious downpour... created an inch of water on the front right passenger floorboards. Replaced the ECU (after water sealing it with RTV) and have had no further problems.

Anyway, have you done compression tests?

killa b

how about vacume leakes or cracked intake tube

Bigblock

/^ ^^^ ^ bingo

1986Yotaboy

well, the one thing I haven't tried is the Vacumm check, it kinda sounds like that is my problem. So, somebody refresh me, how do I go about checking for a vacumm leak?

rowdy235

I use a propane torch. Don't light it but turn it on just a little and wave it around the vacuum hoses. If the idle increases, you have a vacuum leak wherever the torch was when the idle began to raise.

You can also do a similar thing except by spraying WD-40 on the hoses.

SoCal4Running

Is it possible the cold start injector is not turing off or is leaking severly. Where are you at by the way??

1986Yotaboy

I have do the vaccum check. I am in Santa Rosa, in Nor Cal.