88THMPR

Only been here a few times and just stumbled upon this info. Will give this a try on my 85 EFI 4Runner tonight. Maybe I can get it goin finally. I know this is an OLD post but wanted to say thanks to all that added to it. It may just help me get my rig back the road! thanks!!

Jagman60

Good post, I will try this

kiwicowboy

X3 on soldering the splice. Coat the solder joint with dielectric grease and use weatherproof shrink tubing. The grease will help keep out moisture and the exposed wire from corrosion. You could convert the splice to water proof connectors.

01whitez

I am just recently having this issue on my 94, but mine is only missing on the #1 Cylinder. I have pulled the tubing and tape off of the wiring harness and my injector wiring isn't spliced together... it runs all the way to the firewall. Why would this be and what would you suggest for further troubleshooting?

kiwicowboy

"I am just recently having this issue on my 94, but mine is only missing on the #1 Cylinder. I have pulled the tubing and tape off of the wiring harness and my injector wiring isn't spliced together... it runs all the way to the firewall. Why would this be and what would you suggest for further troubleshooting? "

If it's only 1 injector, most likely it's the injector. Try swapping the connectors with #3 and see if it follows the connection. If it's still #1, repair or replace the injector.

Terrys87

iTrader: (1)

Try swapping #3 with one of the other injectors and see it fires. I dont fully understand your only having one wire going to the ECU.

#1 and #3 share the same wiring and is just crimped together. It is a poor design. Mine passed resistance checks and still wouldnt fire.

Otherwise I would suggest making sure it is getting a good connection at the injector.

On post #282 is how I went and fixed mine. Link... https://www.yotatech.com/forums/f199...6/index12.html

Fundy Rider

An old thread but am sure more with similar issues.


I have similar problems except it is one and two that aren't firing. Have spark and such and no pulse on injector's one and two.


Could it still be the same issue with the grounds from # 1and #2 or can it only happen in the way they are paired being #1and #3 and #2 and #4.


If it could only happen in the pairing from factory am I safe to say it is an injector issue vs. grounds?

osv

it's a batch-fired system, which means that they all fire at once... so the way that they are paired shouldn't matter, especially given how they are tied together inside the harness.

to put it another way, the schematics for the harness are wrong, they don't show the wires being tied together inside the harness... rather frustrating.

anyway, that's why you can swap 'em around... the take-home here is that resistance checks on the harness are not definitive, because if even one strand is still hooked up, it'll pass the resistance test, but there won't be enough copper to carry adequate current to fire the injector... the only way to be sure is to cut the harness open.

Fundy Rider

For myself it ended up being the injectors. Put the factory Toyota injectors back in with 351 000kms on them after taking Flamethrower injectors out.


I tried to check the harness with a node light and couldn't get a good pulse so I compared it to the ones that were working and the flash was the same for all four so I figured it would be the injectors.


After a ten month head gasket job along with a lot of other stuff I am so relieved to have it finally run the way it should.


I believe I may have loosened up some crap cleaning things and as soon as I hit the key I may have clogged up Flamethrowers injectors.


I know I still need to get in there and check those grounds for the injectors in the harness. Just because.


No pulse with a screwdriver held up to the injectors was my best indication I had bad injectors. Been told not to rely on that but some times you have to go with what you think.


Thankyou Yotatech