Fuel injector question

[-=Jeff=-]

Okay.. would a LT5 run like complete crap and load up on fuel with one leaky injector? or is there some other issue?

I do know, swapping injectors (all 16) fixes it and I do know one of the ones removed leaks (drivers side injector closest to firewall)

the set with the leaker is newer, I have gotten a replacement for the leaker and want to swap out my Multecs, but I want to see if that one would have been causing my issues for loading up..

Also that one injector was a steady drip, drip, drip with key on

Thanks

[secondchance]

Could you explain "loading up"?
Do you mean the car feeling as if it's choking?

My 94 was running fine when in open loop but as soon as she went into open loop she would ping at light load part throttle.

I replaced all 16 and in retrospect, even when cold,Iwas not quite getting all 405.

Although I did not test old multecs (threw them out vengefully!), my theory was one was leaking (excess fuel). When cold, a little excess would be tolerated but once warmed up, O2 sensor would read excess and trim back resulting in the rest of 3 cylinders running lean, back to normal, rich mixture... and so on.

[tccrab]

I can't speak for leaky injectors, but I had two primary injectors fail and my Z ran like sh!t.
My guess would be that anything that causes the air/fuel ratio to significantly differ from the optimal 14.7 : 1 will cause problems.

TomC
"Crabs"

[-=Jeff=-]

Originally Posted by secondchance

Could you explain "loading up"?
Do you mean the car feeling as if it's choking?

My 94 was running fine when in open loop but as soon as she went into open loop she would ping at light load part throttle.

I replaced all 16 and in retrospect, even when cold,Iwas not quite getting all 405.

Although I did not test old multecs (threw them out vengefully!), my theory was one was leaking (excess fuel). When cold, a little excess would be tolerated but once warmed up, O2 sensor would read excess and trim back resulting in the rest of 3 cylinders running lean, back to normal, rich mixture... and so on.

Loading up on fuel.. too much fuel, but then the one bank would show lean and then it would adjust to go rich but then see too much fuel on the other bank from the leaker. but that just does not make sense

[secondchance]

I suspect mine was doing the same thing. Perhaps not as severe.
When hoked to Tech 1, I was told by the mechanic that one bank (I guess 1-3-5-7 and 2-4-6-8 are processed separately by one O2 sensor each), passenger side, O2 reading was fluctuating.

It wasn't too bad untill about 2 months ago when it got real bad. I suspect initially one injector was probably leaking and then finally it died. I did not bother to check injectors after removal so I don't know this for sure.

As you know, after replacing w/ FIC injectors she has been running flawless.

To answer with your question, based on my experience, one leaker was making mine run like crap. Especially when in closed loop.

Good luck!

[-=Jeff=-]

Originally Posted by secondchance

I suspect mine was doing the same thing. Perhaps not as severe.
When hoked to Tech 1, I was told by the mechanic that one bank (I guess 1-3-5-7 and 2-4-6-8 are processed separately by one O2 sensor each), passenger side, O2 reading was fluctuating.

It wasn't too bad untill about 2 months ago when it got real bad. I suspect initially one injector was probably leaking and then finally it died. I did not bother to check injectors after removal so I don't know this for sure.

As you know, after replacing w/ FIC injectors she has been running flawless.

To answer with your question, based on my experience, one leaker was making mine run like crap. Especially when in closed loop.

Good luck!

you have a 94 and are running FIC injectors with no issues?

I have FIC injectors ( new ones) the leaker has been replaced but I have been hesitant to reinstall them.. the force it takes to install the new ones is less then the old ones

[secondchance]

you have a 94 and are running FIC injectors with no issues?

Yes.

I have FIC injectors ( new ones) the leaker has been replaced but I have been hesitant to reinstall them.. the force it takes to install the new ones is less then the old ones

Based on my experience, pulling old one were tough (probably due to years and stiffend O rings).

New ones, after being greased with Vaseline, were easier to slip into rail as well as into IH.

Did you make sure you got the right set talking to Jon?

[-=Jeff=-]

yeah gaskets are holding okay.. only done 4 plenum pulls with them.. I bypassed coolant from the plenum so the job is not that bad.. but still

Yeah going to check a few things, get them ready and do another pull to swap the Multecs for the FIC.. Talking to another Owner, sounds like it is possible that one leaker would cause those issues too..

[Toyvet1]

Jeff I had one secondary leaking a small stream on passenger side a dropplets leaker on drivers side and you saw how the car ran when it got towed home. But coolant was also leaking , so it might be time to try the fic injectors

[-=Jeff=-]

Okay will do..

Maybe this weekend