What causes a -20% fuel trim?

Just GB remanufacturing brand from carquest and parts authority.

 

Thats probably your problem, alot of aftermarket fuel injectors may work but dont spray the correct amount of fuel. I highly reccomend OEM toyota injectors.

 

I'm aware. I've been an Assistant Manager in auto parts for years and an A.S.E. Parts Specialist from 2006 to last year when N.I.A.S.E. stopped doing testing in my area due to covid. I've inspected the injector's spray pattern and they're spraying just fine and the resistances are great.

 

Do all codes of possible engine trouble trip the warning light?

 

They could be spraying good but that doesnt mean they're spraying the correct amount. Im going to guess it wasnt running rich till those injectors were installed.

Ive even seen denso injectors spray to much fuel which is why I recommend OEM toyota injectors.

 

yes, after the computer goes through it's readiness monitors. my truck is still going through the evaporative test so I don't know yet if there's a code. there's nothing pending but that doesn't mean much until all the tests are done.

 

Unless you've done a flow test on all 6, you can't be sure. Reputable companies attach a test sheet to your order.

 

https://www.lceperformance.com/5VZ-V6-Equalized-Fuel-Injector-Set-99-04-p/1062211.htm

 

Nope. Wasn't the regulator. i'll have to find someone with a scanner to see if i can see which injector might be having to spray less.

 

Updates?

 

None atm, sir. I'm going to, if anything, say don't buy reman fuel injectors. Though my truck runs GREAT and BETTER THAN EVER, I still have an injector, 2 or 3 that are spraying more than they should and the ECU is cutting back. FWIW if you really are on a dime and have to get something, reman is ok. But you'll likely run in to issues like this.

I'm speculating that one of the faulty injectors I installed was made for a different engine, though physically the same. the 3.4 liter has 566CC cylinders whereas a 2.4 toyota has 600CC cylinders. A possibility is that I have an injector for a 2.4 from roughly the same year spraying a little more than the 3.4 needs or the jets of one of the remans I got has been slightly "opened" which isn't something that is replaced when rebuilding injectors.

 

Can recommend MotorWest performance for a good set of injectors. Have used on 2 trucks and both went great.

 

Why am i only learning about this company now?

 

They’re a great shop, ask them about the brown vs blue injectors

 

PHUK!Q@ So monday my engine light comes back on and you guessed it, too rich. So I ordered those MotorWest performance and now my truck runs better than ever!

 

Trims are on average 0%, does't stumble when idling. it used to lose power and act weird as RPMs would climb towards redline, now it accelerates smoothly. No knocking. and I think it was cheaper than buying those other injectors from my old job I just threw them away. Not even bothering trying to get my money back. fuck it.

 

How much were they

Edit: and im glad you came back and posted the solution.

 

just north of $300 for all 6.

 

Run the blues or browns?