restored power to injectors

Lil Red Yarder

Lil Red Yarder

New member
Somehow I got power restored to my injectors. I unplugged the ECU and left it for a few days. I had to take a break. Now I have constant power to both wires in the harness. Is that normal?

All injectors test fine for ohms.

Not sure how many volts I should be getting to injectors due to not having access to a FSM (for some reason I cant open the FSM on the sticky).

Still getting spark

What could I be missing?

Timing still set to what my Hanes book says. Crank at 0 degrees, cam pin at 12:00 and distributor at 11:30.

I know by now everyone has got to be tired of reading my posts and Im sorry, I just need help. Everyone here seems to know more then my local Toyota dealer and the auto shops.

:ybrick:
 
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When you say you have constant power to both wires for your injectors, that is only when you have the key in the "ON" position right? If so, I don't think you have a problem. I didn't see anything in the FSM that state otherwise. However your resistance at each injector should be between 1.0 and 1.5 ohms. The resistor on the side of your fender should be between 2-3 ohms.

If you didn't have power before and you didn't change anything and you have power now, I would guess that you have a weak connection in your plug. Just for safe measure, unplug your ECU again and check out your two pins that control your injectors. Make sure that they're seated properly and firm. Make sure that they're clean and free of corrosion. Also make sure that the pins on your ECU are clean.
 
Pins are good and clean. My 89 dosent have a resistor, unless it is hidden somewhere. I checked for that first thing thru this mess
 
I didn't know yours was an 89. All of the specs I gave you for the injectors are for 88 and below.

Does your 4runner run and drive right now? I don't really understand what your issue is at this point.
 
Ok Ill give you a quick history. I had an 86 but it got totaled,but it still ran good. I went and got an 89 that ran but had a rod knocking. I swapped long blocks and since I havent been able to get it to start. I have check and rechecked everything. Ive been working on it for about 2 weeks and no luck so far. the only motor work Ive done is top end gaskets.
 
I'm assuming that it will crank and crank but not start?

I remember your thread now. You said that you pulled a plug and saw that you were getting spark, right? If so then spark is not your issue and I would check fuel next. Crank your motor for about 10 seconds and try to flood it out in a sense. Pull each plug and see if you're getting fuel in every cylinder. Visually verify that you're getting fuel and spark in each cylinder.
 
SV_Dude said:
I'm assuming that it will crank and crank but not start?

I remember your thread now. You said that you pulled a plug and saw that you were getting spark, right? If so then spark is not your issue and I would check fuel next. Crank your motor for about 10 seconds and try to flood it out in a sense. Pull each plug and see if you're getting fuel in every cylinder. Visually verify that you're getting fuel and spark in each cylinder.
Click to expand...

Good post. If it's possible you might want to check the fuel pump or fuel filter if you still don't get anything up top. Could be a plugged filter or weak pump. Normally for something like this i'd suggest checking the coil but since you're getting sparks i'd say it's in the fuel mechanics somewhere. Best of luck bud
 
#1 and 3 plugs came out dry

#2 and 4 came out wet

How hard is it to rebuild injectors. the kits are really cheap and I have a spare set that Ive been hanging on to for a couple years. If its not hard I might give it a try. probably should have it professionally done tho so they can be flow tested
 
wait is this the I4? I'm assuming there's a single fuel rail, if so then yeah your injectors have issues :/ As for rebuilding them, not sure I've never personally done it but I wouldn't assume it would be that hard. but it is mechanics so everything at your own risk. haha
 
If only 2 cylinders are getting fuel then I would bet that your injectors need to be cleaned or replaced. You can take them out and have them professionally cleaned for about $10-$15 per or you can get some newish injectors that have been flow tested and cleaned from LCE for about $200.

If only half your cylinders are getting fuel then I would think that is your issue.

edit: It's been a while since I looked at the wiring diagram but there are two power wires for the fuel injectors. I'm not sure if each wire controls 1-2 and 3-4 or 1-3 and 2-4. Double check the wiring diagram. You may have a wiring issue that is causing your two injectors to not fire.
 
Definitely a wiring issue. See the attachments below. The injectors are controlled by two wires. You have a bad wire that controls the 1 and 3 injectors. Test the wires and find the bad spot. Replace or splice that wire and you should be golden.
 

Attachments

  • Injector wiring 1.jpg
    Injector wiring 1.jpg
    80.5 KB · Views: 685
  • Injector wiring 2.jpg
    Injector wiring 2.jpg
    86.7 KB · Views: 668
Ok so had a thought when I was starting to track the wires. Shoulda had this thought to start with. I get power to all my injectors. How can it be a wire?

Possibly a broken ground wire but not one of the power wires.

Im gonna check ground wires but if one of them were broken wouldnt it keep power from being read at the injector plug?
 
It could be a coincidence that your #1 and #3 injectors are bad. But I would be willing to bet you have a bad wire. Where did you test to get power at all injectors? Did you test it at each plug using both terminals on the plugs?
 
I tested at the plugs. each side individually to the injector ground. I agree that it would be one hell of a coincidence that #1 and 3 went out and it not be a wire
 
How about swapping the known good injectors with the ones that aren't spitting gas, and see if they spit gas. If so - it will confirm that the wires need tracing.

Just my .02 cents.
 
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