I recently purchased a 87 toyota pickup with the 22re, when it is idling it dose not run smothe and if i pull off the # 4 plug wire it has no change. if i pull off the #2 or #3 plug wire it changes but just a little bit. If i pull off the #1 plug wire it almost dies. I have checked the spark on all 4 plugs and im getting spark, i also checked the compression all 148-150
so far i have replaced all the vacuum lines and checked they are right
replaced the battery, plugs, wires, cap, rotor. replaced all 4 injectors, and re wired the injector wiring harness. I have also swaped out the ecu and sill have the same issue. any ideas? thanks

 

well i just had the tps adjusted and i changed out the fuel filter and the fuel pump, still no luck. i know the guy i got the truck from never had the valves adjusted and it has about 45k on a new motor could that be the problem ?

 

I would check the plugs and plug wires, it is possible for them to go bad or even be bad right out of the box.

What brand plugs and and wires did you buy ?.

 

ngk plugs and duralast/autozone wires

 

The NGK plugs are good, not sure about the duralast/autozone wires, because ive never used them. Have you tried swapping the plugs or wires to different cylinders to see if the problem moves to a different cylinder ?, that would tell you if its a plug or one of the wires. I would also check the 02 sensor, if its original or has alot of miles on it, it could be weak or bad and it could cause the problems your having. If you have to replace the 02 sensor get an OEM Denso replacement, DO NOT get a Bosch 02 sensor, they don`t work in toyotas.

 

double checked all the plugs/ wires swapped them around , no change. i pulled out the o2 sensor it looks ok and i have no codes. i could only hope it was something so easy

 

sounds like it could be your wire harness splices. I had this issue with my 86 and had it found and fixed in 15 minutes. check this link for more info or do a google search about your injector wire harness. Hope this helps.
https://www.yotatech.com/forums/f115...e-help-178975/

 

did that yeserday , please see orginal post

 

-Ignition coil
-Valve clearance incorrect
-Valve(s) stuck closed
-Broken/damaged rocker arm(s)
-Fuel injector Circuit
-ECU

 

I had a feeling it might be a valve out of adjustment i can hear a slight ticking / chattering coming from under the valve cover , used the screwdriver to ear and im guessing its between #3 and #4 cyl. Iv never done a valve adj before but judging by the book and some of the other threads on here it dosnt seem too hard. any tips or tricks before i get started ?

 

Check injector wiring. Swap injector plugs and see if the problem moves. All injectors fire at the same time. Or use a volt meter and check that you are getting a pulse.

 

so i was letting the truck warm up to do the valve adj and i pulled the egr hose and put my finger over the metal tube ( seen it in another thread thought id try it) and i noticed it was clogged full and completly closed. could this be the problem ?? should i clean it out or buy a new one ?

 

swap out #3 and #4 injector wires and see if the problem moves to #3.

 

i swaped in a new egr and did the valve adjustment and then i had a consistent change in idle when i remove plug wires 1,2&3 but sill no change in #4 so i switched injector plugs on 3&4 and i still have no change in idle when i pull off he # 4 plug wire

 

Edited.. The easiest thing to do is make sure the connector is good itself, but if not remove the clips mentioned below. Injector connectors are a poor design and some use the connectors that are in the 89-95 style trucks. Forget which year they went to the squeeze tab instead of the wire clip that holds them to the injector.

It sounds like it is in the harness. There are some little connectors inside the wiring harness and they will pass a resistance check but wont let the voltage thru to fire the injector. I have even seen the wires broken. #1 and #3 share a wire and the same for #2 and #4. Since you swapped injectors already, I am sure it is not connected. You will need to pull the Plenum off and unwrap the harness back about 6 or 8 inches and you should see the wires that are in common with the injectors.

It is a poor design. #4 did work in #3 position right? I read it but did get lost digging up the info. You can go thru my 86 Runner build below and find some better pictures of the clips I am referring to. Seems to me one wire is yellow and one wire is blue. Remove them clips and solder them together.

Go to post #282 for all of the steps I went thru, but really feel it is the clips in the harness https://www.yotatech.com/forums/f199...6/index12.html

 

#4 did not work when i switched the #3&4 injector plugs. and i replaced the injector harness last week with all new wires and new injector plugs

 

One my 88 4Runner(first page) build I show how to block off your EGR and what all is a mess in it. I have fixed several EGRs problems and never have replaced one. Might have to some day but not yet up to this point. They just need a good cleaning. There are other ways of disabling a EGR by plugging one of the vacuum lines, I think it is the bottom one but not sure. You will need to look it up or it will throw an EGR code if you dont get the right one. You can remove either the plugged line or the block off plate as I did it for smog check.

If it is clogged that bad, I suggest pulling your TPS off and take the Plenum to a carwash and use high pressure soap and water to get all of the carbon out. All of the vacuum ports on your Plenum are going to be clogged as well. Others have used different methods of such as oven cleaner and brake cleaner. I have not done it that way. What works for you.

 

Switching harnesses should of fixed the problem, did the harness go all the way to the computer?

 

I found on another site and dont remember which one it was and they said to run a ground wire from the cover of the ECU to ground, I dont know if it really does any good, but figured it couldnt hurt.

When you switched harness, an 88 is set up different and I dont know if the harness was changed, but that is something I would be aware of.

 

i only replaced the harness up to the passenger finder well about 8-10 inches past where toyotas original splices were all the wiring from there on looked good.