newbie injector question

[Mike1952]

I have a 90 ZR1 with about 16k miles that I have original injectors still installed. Which injectors do you recommend to keep the ethanol at bay? David you have a post to a site for injectors but you didn't say which set you were recommending. I have a slight miss at 4k throttle and up sometimes and I am sure it is related to injectors.

TIA, Mike :confused:

[Kevin]

rc or fic

[tomtom72]

I believe if using the FIC injectors the preference is the "new" not the rebuilt injectors....the price about doubles but I think it's worth the POE to get new ones. JMHO

:cheers:
Tom

[ZZZZZR1]

I believe if using the FIC injectors the preference is the "new" not the rebuilt injectors....the price about doubles but I think it's worth the POE to get new ones. JMHO

:cheers:
Tom

I agree Tom!

FIC (new SS ones) They just started making Stainless Steel injectors recently and these are probably the best for long term use.

:cheers:

David

[Mike1952]

okay remember I'm a newbie....where do you buy them and is there a part number I need. What should they cost?

:cheers: Mike

[ZZZZZR1]

okay remember I'm a newbie....where do you buy them and is there a part number I need. What should they cost?

:cheers: Mike

Mike,

Sorry!

http://fuelinjectorconnection.com/shop/index.php?_a=viewProd&productId=208

:cheers:

David

[Mike1952]

thanks David. Do those come with seals? Anyone in particular for plenum gaskets?

Mike :handshak:

[tomtom72]

thanks David. Do those come with seals? Anyone in particular for plenum gaskets?

Mike :handshak:

http://jerrysgaskets.com/store2/root/ Jerry can fix you up with the soft goods and a lot of hardware also.

An alternate source is also:

http://whiteracingproducts.com/

:cheers:
Tom

[A26B]

Mike,

I recommend using Viton over Buna for ethanol blended fuels, which is virtually all you have in Texas. here's a short list of the items needed to replace the injectors.

http://jerrysgaskets.com/store2/root/index.php?main_page=product_info&cPath=16_18&products_id=7

http://jerrysgaskets.com/store2/root/index.php?main_page=product_info&cPath=16_18&products_id=384

http://jerrysgaskets.com/store2/root/index.php?main_page=product_info&cPath=16_18&products_id=387

AND.... here is a tech data link for info to replace the lower primary injector seal. You can download this to your computer and/or print it out to refer to while you are working.

http://jerrysgaskets.com/store2/root/index.php?main_page=product_info&cPath=13&products_id=446

[PhillipsLT5]

accel injectors

[carmine]

Just Purchased A Set From RCGreat People Discount For Zr-1 Members Carmine 90 Black Gray#357

[Mike1952]

thanks for the advice everyone.....now to study up on the plenum removal. :)

Mike

[Kevin]

thanks for the advice everyone.....now to study up on the plenum removal. :)

Mike

plenum is easy, it's the housings and injectors that are a little more difficult

[Mike1952]

plenum is easy, it's the housings and injectors that are a little more difficult

thanks for the warning....I think. :handshak:

[Kevin]

thanks for the warning....I think. :handshak:

none of it is impossible, it's not even that hard just time consuming and intricate. the plenum is easy, the IH's are just a little harder

[scottfab]

The last time I saw a thread on injectors it seems to me the RC design won out based on them being less prone to fouling (rotory design not pental) and that they were stainless steal (corrosion resistant).
I converted to RCs back in the 90s. (I think).
No problems since.
Things to note. The early Zs had a different diameter injector for primary and secondary.
Secondary injectors tend to leave the O-ring behind when you pull them out. The primaries don't. Be careful to note where the orange rubber seal goes when you pull the injector electrical connector off. It's tinny and rectangular.
They can dangle and fall off.
Good luck

[Kevin]

whats the part number for the fic injectors we need? D042H-8 or D052H-8? is it the same for the primary and secondaries or not?

[ittlfly]

You might want to view this, thanks to Jerry's Gaskets. click on: "click here to down load".

http://jerrysgaskets.com/store2/root/index.php?main_page=product_info&cPath=13&products_id=446

[NWPzr1]

I'm a newbie myself. I just ordered 16 rebuilt FIC injectors for a customers 1990 zr1. They said nothing about the primary or secondaries being different, and now I'm hoping they're sending me the right ones! I've heard nothing but good things about their customer service and honoring warranties etc etc... fuelinjectorconnection.com

I've seen others have good experience with them, anyone know if this is something to worry about?


Thanks

[tomtom72]

http://www.fuelinjectorconnection.com/shop/index.php?_a=viewProd&productId=208

These are the ones I would use if I were going to buy FIC injectors for my 90. I perhaps would give thought to the rebuilt FIC's if I wanted to save 1/2 the cash.

:cheers:
Tom

[A26B]

I'm a newbie myself. I just ordered 16 rebuilt FIC injectors for a customers 1990 zr1. They said nothing about the primary or secondaries being different, and now I'm hoping they're sending me the right ones! I've heard nothing but good things about their customer service and honoring warranties etc etc... fuelinjectorconnection.com

I've seen others have good experience with them, anyone know if this is something to worry about?


Thanks

No worries! :cheers:

[Kevin]

http://www.fuelinjectorconnection.com/shop/index.php?_a=viewProd&productId=208

These are the ones I would use if I were going to buy FIC injectors for my 90. I perhaps would give thought to the rebuilt FIC's if I wanted to save 1/2 the cash.

:cheers:
Tom

I'm trying to decide between the two myself. I like the savings on the rebuilts but i'm a little leery

[-=Jeff=-]

I have FIC Rebuilts, I had a couple leakers but were replaced fast for me..

3 years now no issues

[tomtom72]

I'm trying to decide between the two myself. I like the savings on the rebuilts but i'm a little leery

Kevin, please don't take my post as a knock on the rebuilt FIC's as it's not. I have to do my work Al Fresco. It's not worth it to me to spend less and have the chance I'll have to do the job over. I know that there is a chance that any part can be bad out of the box, new or rebuilt. I based my logic on the fact that the FIC rebuilds have had the odd leaker, also I can't remember any one posting about getting bad new injectors right out of the box.....it's more a decision of what circumstances I have to deal with if I want to do real work on my car.

:cheers:
Tom

[VetteMed]

I'm very satisified with my FIC injectors, and happy I saved a few hundred bucks in the process.

[Kevin]

Kevin, please don't take my post as a knock on the rebuilt FIC's as it's not. I have to do my work Al Fresco. It's not worth it to me to spend less and have the chance I'll have to do the job over. I know that there is a chance that any part can be bad out of the box, new or rebuilt. I based my logic on the fact that the FIC rebuilds have had the odd leaker, also I can't remember any one posting about getting bad new injectors right out of the box.....it's more a decision of what circumstances I have to deal with if I want to do real work on my car.

:cheers:
Tom

I think i'm going with FIC and I'm torn between new and rebuilts. the extra $300 in my pocket would be nice but so would not having to rip apart my plenum again because they leak.

[ZR-1nce removed]

Kevin, please don't take my post as a knock on the rebuilt FIC's as it's not. I have to do my work Al Fresco. It's not worth it to me to spend less and have the chance I'll have to do the job over. I know that there is a chance that any part can be bad out of the box, new or rebuilt. I based my logic on the fact that the FIC rebuilds have had the odd leaker, also I can't remember any one posting about getting bad new injectors right out of the box.....it's more a decision of what circumstances I have to deal with if I want to do real work on my car.

:cheers:
Tom
Tom, allow me to be the first that posted about bad ""new injectors out of the box. I installed the rebuilt ones from FIC and they were bad right away. We also had problems with a rebuilt set in Jims 93. I will give credit to FIC for their outstanding customer service because they overnighted me 2 sets of the new stainless ones. Once we installed the two new sets, we were back on track, but that was 4 injector jobs in 2 days. The extra money for the new SS ones are worth it....

[NWPzr1]

I installed 16 rebuilt FIC injectors on the 90zr1, and everything seems to be good so far.... It only has 10k miles, I threw some Lucas fuel system cleaner in the tank and trying to put some miles on the car. Although, I did get on it a few times up to 6-7k rpm and it seemed to run a bit rough after that in the lower rpm's for 10 min or so before I shut the car off. Then I went to start it up 2hrs later and it cranked for about 5 seconds before it fired and smelled like raw fuel for a few seconds. I've put some miles on it since then, but no problems have persisted. Thoughts?

[Paul Workman]

I installed 16 rebuilt FIC injectors on the 90zr1, and everything seems to be good so far.... It only has 10k miles, I threw some Lucas fuel system cleaner in the tank and trying to put some miles on the car. Although, I did get on it a few times up to 6-7k rpm and it seemed to run a bit rough after that in the lower rpm's for 10 min or so before I shut the car off. Then I went to start it up 2hrs later and it cranked for about 5 seconds before it fired and smelled like raw fuel for a few seconds. I've put some miles on it since then, but no problems have persisted. Thoughts?

Asking for guesses? Hmmmm.... I'm gonna guess one or more injectors is or was leaking. A fuel pressure leak-down test would be SOP for any new injectors. In fact, test can be done, and the injectors can be visually inspected before the plenum is reinstalled by hooking up the fuel rail and turn the ignition switch to ON and inspecting the injectors by looking down in the IH runners. Any fuel spraying or dripping, etc and you have your culprit/s. (I suppose you could poke a paper towel down below the injector nozzles to see if there is any seeping going on.) Then turn the switch off while monitoring fuel pressure at the Schrader (sp?) valve. It should hold to within a pound or two for 3-5 minutes w/o signs of leaking (dripping). I've done this before, and trust me, it is a lot easier to do than pulling the plenum to find a runner full of fuel, or hydra-locking a cylinder...:cry:

Just something to keep in the back of your mind, if there is no fuel leaking from the injectors, yet the leak down test is failing, I had a bad check valve in a newly installed fuel pump cause issues. My point being, testing the injectors before installing the plenum has many advantages, and you don't have to pull the plenum off (cuz it was not yet installed) to troubleshoot. Just a thought.;)

And, another thing...if that "injector cleaner" loosens something between the fuel filter and the injectors, where is it going to go? Any fuel system (including the fuel rails) cleaning would be best done before the injectors were reinstalled, and by a more positive/aggressive method than a passive fuel additive, IMO. Flushing the lines and replacing the filter(s) before installing the injectors...would be what I would prefer to do (but that's just me).

:cheers:

P.

[scottfab]

I installed 16 rebuilt FIC injectors on the 90zr1, and everything seems to be good so far.... It only has 10k miles, I threw some Lucas fuel system cleaner in the tank and trying to put some miles on the car. Although, I did get on it a few times up to 6-7k rpm and it seemed to run a bit rough after that in the lower rpm's for 10 min or so before I shut the car off. Then I went to start it up 2hrs later and it cranked for about 5 seconds before it fired and smelled like raw fuel for a few seconds. I've put some miles on it since then, but no problems have persisted. Thoughts?

Since you asked for thoughts and not guesses, here goes. I think there's no sense in worrying about what you could have done because the 90 has no exhaust valve seals. Oil leaks down into the combustion chamber and after high rpm runs will run a bit rough till it clears out. Mine does. So unless your engine has had seals added I'd suspect that. Try hard runs at 5-6k and see if it has the same symptoms. Mine runs fine at those rpms. Fist time I get into the heads the seals are going in.

[FU]

The extra money for the new SS ones are worth it....

Excellent advise.

[A1990]

Jon at FIC is now a member of the Registry!

[NWPzr1]

Asking for guesses? Hmmmm.... I'm gonna guess one or more injectors is or was leaking. A fuel pressure leak-down test would be SOP for any new injectors. In fact, test can be done, and the injectors can be visually inspected before the plenum is reinstalled by hooking up the fuel rail and turn the ignition switch to ON and inspecting the injectors by looking down in the IH runners. Any fuel spraying or dripping, etc and you have your culprit/s. (I suppose you could poke a paper towel down below the injector nozzles to see if there is any seeping going on.) Then turn the switch off while monitoring fuel pressure at the Schrader (sp?) valve. It should hold to within a pound or two for 3-5 minutes w/o signs of leaking (dripping). I've done this before, and trust me, it is a lot easier to do than pulling the plenum to find a runner full of fuel, or hydra-locking a cylinder...:cry:

Thoughts are guesses maybe right?

Just something to keep in the back of your mind, if there is no fuel leaking from the injectors, yet the leak down test is failing, I had a bad check valve in a newly installed fuel pump cause issues. My point being, testing the injectors before installing the plenum has many advantages, and you don't have to pull the plenum off (cuz it was not yet installed) to troubleshoot. Just a thought.;)

I tested it all before I re-installed the fuel rail, everything was fine and pressure held.

And, another thing...if that "injector cleaner" loosens something between the fuel filter and the injectors, where is it going to go? Any fuel system (including the fuel rails) cleaning would be best done before the injectors were reinstalled, and by a more positive/aggressive method than a passive fuel additive, IMO. Flushing the lines and replacing the filter(s) before installing the injectors...would be what I would prefer to do (but that's just me).

The car was running on four cylinders... literally. I'm not going to drive around with injector cleaner in the tank with four dead holes. Four primary and 2 secondary injectors ohm'd 0.06.... Spec is roughly 12.0-15.0 ohms. I'm was thinking original injectors is the problem obviously. Car has 10k mint miles on it, factory fuel filter paper element was intact and clean and was replaced with injectors as to not clog fuel system between injectors and filter.

Now the car runs like a champ, and only acted up that one time. I'll be installing a headers and exhaust soon as well as 2 new O2 sensors since they're original and most likely fouled do to previous injector condition, which I understand could be the culprit as well.







:cheers:

P.


asfdasfd

[NWPzr1]

Since you asked for thoughts and not guesses, here goes. I think there's no sense in worrying about what you could have done because the 90 has no exhaust valve seals. Oil leaks down into the combustion chamber and after high rpm runs will run a bit rough till it clears out. Mine does. So unless your engine has had seals added I'd suspect that. Try hard runs at 5-6k and see if it has the same symptoms. Mine runs fine at those rpms. Fist time I get into the heads the seals are going in.


That's interesting! I know they don't have the seals, but didn't think it would inhale enough oil to run a rough. Worst case, it is a warrantied injector and what's another hour or two...

That's food for "thought", I appreciate it! =D>

[Kevin]

Jon at FIC is now a member of the Registry!

cool, hope he starts posting here.