Fuel Injectors
Thread Starter
Intermediate
Joined: Jun 2023
Posts: 31
Likes: 5
From: SW Wisconsin
Fuel Injectors
Sorry for rehashing what HAS to be a heavily talked about topic, but the information I've found to this point is old (like 2009 old).
I am in need of a good, but moderately priced set of fuel injectors for my 1993 40th anniversary C4. I'd appreciate any input. So far as I know the car has no modifications so as close to stock as possible unless I can slip something in that would get a few more ponies without a complete re-tune. I see them out there from $60, I see them for $600.
Thoughts?
Thanks
YTEE
I am in need of a good, but moderately priced set of fuel injectors for my 1993 40th anniversary C4. I'd appreciate any input. So far as I know the car has no modifications so as close to stock as possible unless I can slip something in that would get a few more ponies without a complete re-tune. I see them out there from $60, I see them for $600.
Thoughts?
Thanks
YTEE
Thread Starter
Intermediate
Joined: Jun 2023
Posts: 31
Likes: 5
From: SW Wisconsin
Agreed, I cleaned them and they are just acting odd enough that I think it's time. I bought my C4 from a party and from what I got from him and the paperwork, it's been sitting for 10 years and the fuel in the tank was as NASTY as I've ever seen and I think that was where my issue began
Instructor
Joined: Jan 2013
Posts: 128
Likes: 26
I bought a reman flow matched set from FIC for my 91 with the gasket set and a new pressure diaphragm. Car definitely runs smoother, starts immediately always etc I'm very satisfied. If I ever need to change the injectors again I'll choose a set of all new flow matched just because changing these was so worth the money. I do know some haven't had any change, so YMMV.
Drifting
Joined: Jul 2022
Posts: 1,805
Likes: 365
From: Central Florida
I always learn the hard way. I bought mine from a place in New York or New jersey can't remember which. One of the eight injectors measures 14 ohms and the rest 16. My car is not running right, probably not the refurbished injectors but while I was into the top end I thought I might send them back and have them tested to make sure. So I emailed them and explained the situation and asked the cost. $160 to test their injectors, no mention if 14 ohms was out of spec. When I bought them the injectors + shipping were $190.
Instructor
Joined: Sep 2022
Posts: 113
Likes: 51
Mine are ACCEL flow checked and stamped by Jim at TPIS. One of the best replacement parts I've done. As soon as I changed them out, the car idles and accelerates smooth at all throttle ranges. I like ACCEL parts for the C4. Of course, they fall under Holley now like MSD and Mallory.
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Racer
Joined: Oct 2001
Posts: 311
Likes: 2
From: Roseburg OR
Another vote for Fuel Injector Connection.
Replace fuel filter and flush all lines. Also disassemble the fuel pressure regulator and clean it out. Had one that had sat for 5 years or so and the ethanol gas had turned green and left green gunk that would have clogged new injectors is not flushed out of all fuel lines.
Replace fuel filter and flush all lines. Also disassemble the fuel pressure regulator and clean it out. Had one that had sat for 5 years or so and the ethanol gas had turned green and left green gunk that would have clogged new injectors is not flushed out of all fuel lines.
Thread Starter
Intermediate
Joined: Jun 2023
Posts: 31
Likes: 5
From: SW Wisconsin
Thanks for the advice all.
I have 'Christmas' waiting at my house: a new set of fuel injectors, 2 fuel filters, a two book, red, Chevy Shop Repair manual (CD) and a new 1/2" battery powered ratchet in the mailbox as I type.
We get home tonight and I'll finish the fuel tank clean first thing tomorrow, will see about cleaning the regulator and will flush the lines both ways. I'm gonna change the fuel filter and reassemble. If the old girl comes to life the lines will get replaced.
Thanks again to all. I'll post my results
YTEE
I have 'Christmas' waiting at my house: a new set of fuel injectors, 2 fuel filters, a two book, red, Chevy Shop Repair manual (CD) and a new 1/2" battery powered ratchet in the mailbox as I type.
We get home tonight and I'll finish the fuel tank clean first thing tomorrow, will see about cleaning the regulator and will flush the lines both ways. I'm gonna change the fuel filter and reassemble. If the old girl comes to life the lines will get replaced.
Thanks again to all. I'll post my results
YTEE
Racer
Joined: Jul 2022
Posts: 491
Likes: 159
From: Wilmington,Delaware
Sorry for rehashing what HAS to be a heavily talked about topic, but the information I've found to this point is old (like 2009 old).
I am in need of a good, but moderately priced set of fuel injectors for my 1993 40th anniversary C4. I'd appreciate any input. So far as I know the car has no modifications so as close to stock as possible unless I can slip something in that would get a few more ponies without a complete re-tune. I see them out there from $60, I see them for $600.
Thoughts?
Thanks
YTEE
I am in need of a good, but moderately priced set of fuel injectors for my 1993 40th anniversary C4. I'd appreciate any input. So far as I know the car has no modifications so as close to stock as possible unless I can slip something in that would get a few more ponies without a complete re-tune. I see them out there from $60, I see them for $600.
Thoughts?
Thanks
YTEE
Burning Brakes
Joined: Jan 2015
Posts: 874
Likes: 76
When you replace fuel injectors. Make sure to get proper oring kit for the fuel rail and go ahead and flush out the fuel rail with something like carb cleaner or something and put new orings in. And this would be a good time to go ahead and replace the fuel pressure regulator as it's probably on it's way out if you've never replaced it.
I replaced the orings in my fuel rail when I did my injectors. And then a decade later one of the fuel rail orings sprung a leak. And so I had to tear it back down to redo the orings. And I sent the injectors back to FIC to have them cleaned and have the filter baskets replaced, etc. I think they found a couple of bad injectors that got replaced.
Thread Starter
Intermediate
Joined: Jun 2023
Posts: 31
Likes: 5
From: SW Wisconsin
Thanks to everyone for the advice and input. Installed the new injectors, cleaned the tank ('bout threw up) and fuel lines, replaced the fuel filter. Turned the key and guess what?!?! IT IS ALIVE! 
Now I just need a little advice on brakes and how to straighten a slightly bent front part of the frame. Looks to be the passenger side, forward of the front wheel (I haven't gotten measurements, but I'm 90% sure it's 'just' the area in front of the wheel....hood will NOT line up---fingers crossed that's 'all' that needs straightening ; )
YTEE
Now I just need a little advice on brakes and how to straighten a slightly bent front part of the frame. Looks to be the passenger side, forward of the front wheel (I haven't gotten measurements, but I'm 90% sure it's 'just' the area in front of the wheel....hood will NOT line up---fingers crossed that's 'all' that needs straightening ; )
YTEE
Instructor
Joined: Sep 2024
Posts: 246
Likes: 25
Sorry for rehashing what HAS to be a heavily talked about topic, but the information I've found to this point is old (like 2009 old).
I need a good, but moderately priced set of piezo injector for my 1993 40th anniversary C4. I'd appreciate any input. So far as I know the car has no modifications so as close to stock as possible unless I can slip something in that would get a few more ponies without a complete re-tune. I see them out there from $60, I see them for $600.
Thoughts?
Thanks
YTEE
I need a good, but moderately priced set of piezo injector for my 1993 40th anniversary C4. I'd appreciate any input. So far as I know the car has no modifications so as close to stock as possible unless I can slip something in that would get a few more ponies without a complete re-tune. I see them out there from $60, I see them for $600.
Thoughts?
Thanks
YTEE