Fuel injector question - Page 2 - ZR-1 Net Registry Forums

secondchance · 05-13-2009

http://www.zr1specialist.com/HAT%20W...eplacement.pdf

Interesting. This article talks about retro fitting 93-95 injectors to 90-92 motor.
On page 2, it says lower body of 93-95 injectors are 0.027" smaller (I guess they mean in diameter) and says will require larger injector O-ring.

Interesting article by ZR1 Specialist.

It sounds as though flow rate is not a major issue. Nonetheless, I will see if I can get exact flow rate for early LT5.

-=Jeff=- · 05-13-2009

Quote:

Originally Posted by secondchance

http://www.zr1specialist.com/HAT%20W...eplacement.pdf

Interesting. This article talks about retro fitting 93-95 injectors to 90-92 motor.
On page 2, it says lower body of 93-95 injectors are 0.027" smaller (I guess they mean in diameter) and says will require larger injector O-ring.

Interesting article by ZR1 Specialist.

It sounds as though flow rate is not a major issue. Nonetheless, I will see if I can get exact flow rate for early LT5.

yeah but since i am using 93-95 IH that should not be an issue either

secondchance · 05-13-2009

Quote:

Originally Posted by -=Jeff=-

yeah but since i am using 93-95 IH that should not be an issue either

True, bottom of injector go into IH.

secondchance · 05-13-2009

Are you running 21 lbs? Any mods to the motor?

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

Once again, I think when one injector is rich system tries to compensate and keeps going back and forth.
I imagine, when one is clogged, it may do the same (lean, detect richen, too much, back off, lean, and so on).

I would pull the plenum carefully, replace the leaker then, for now, patch where gasket breaks (if it does) with a dab of O2 sensor safe, high temp sealant, see if its a fix and if so, replace with the new gasket.

Good luck and keep me posted. Don't give up! I chased my problem for years finally to be resolved recently.

-=Jeff=- · 05-13-2009

Quote:

Originally Posted by secondchance

Are you running 21 lbs? Any mods to the motor?

Should be 21lb.. Will check with Jon

mods:

headers, Exhaust

93-95 IH and plenum

car is a 90

secondchance · 05-13-2009

See edited version above.

-=Jeff=- · 05-13-2009

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 · 05-13-2009

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=- · 05-13-2009

Okay will do..

Maybe this weekend

-=Jeff=- · 05-15-2009

Drove car today with Multecs.. runs fine

Swapped to the FIC ones tonight

hoping weather is nice in the next day or so to try

05-13-2009	#11
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,719	Re: Fuel injector question http://www.zr1specialist.com/HAT%20W...eplacement.pdf Interesting. This article talks about retro fitting 93-95 injectors to 90-92 motor. On page 2, it says lower body of 93-95 injectors are 0.027" smaller (I guess they mean in diameter) and says will require larger injector O-ring. Interesting article by ZR1 Specialist. It sounds as though flow rate is not a major issue. Nonetheless, I will see if I can get exact flow rate for early LT5.

05-13-2009	#14
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,719	Re: Fuel injector question Are you running 21 lbs? Any mods to the motor? 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 Once again, I think when one injector is rich system tries to compensate and keeps going back and forth. I imagine, when one is clogged, it may do the same (lean, detect richen, too much, back off, lean, and so on). I would pull the plenum carefully, replace the leaker then, for now, patch where gasket breaks (if it does) with a dab of O2 sensor safe, high temp sealant, see if its a fix and if so, replace with the new gasket. Good luck and keep me posted. Don't give up! I chased my problem for years finally to be resolved recently. Last edited by secondchance; 05-13-2009 at 07:00 PM. Reason: add info

05-13-2009	#16
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,719	Re: Fuel injector question See edited version above.

05-13-2009	#17
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,156	Re: Fuel injector question 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.. __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978

05-13-2009	#18
Toyvet1 Join Date: Dec 2007 Location: Bloomingdale, Il Posts: 330	Re: Fuel injector question 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

05-13-2009	#19
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,156	Re: Fuel injector question Okay will do.. Maybe this weekend __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978

05-15-2009	#20
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,156	Re: Fuel injector question Drove car today with Multecs.. runs fine Swapped to the FIC ones tonight hoping weather is nice in the next day or so to try __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978