fuel injectors

[swaindm]

:( I have three failing injectors on my 1990 Z. I am thinking of going with Accels. Do the primary and secondary injectors have different flow rates?Are they the same part number? I'll be replacing all sixteen. Dennis Swain

[ROGER E]

Yes they are all the same. I just replaced mine with the accels and they work great on my 91.

[swaindm]

Thanks, Roger! Dennis

[Z Factor]

:( I have three failing injectors on my 1990 Z. I am thinking of going with Accels. Do the primary and secondary injectors have different flow rates?Are they the same part number? I'll be replacing all sixteen. Dennis Swain

Hello and welcome to the forum.:handshak:



:cheers:

[swaindm]

Roger, Where did you buy your injectors?

[tccrab]

He bought them from Summit.
http://store.summitracing.com/partdetail.asp?autofilter=1&part=ACC%2D150821&N=700+115&autoview=sku

[ROGER E]

Thanks Tom! I got them from Summit Racing which wasn't too far from me.
Part number ACC-150821 which is a set of 8 so you need 2. Total cost was
$579.72. When you install them, use the outer ring slot on the end of the injector when you clip them in to the fuel rail so as to keep the distance the same as the old ones. Also, the secondary injectors' plug have a notch guide that does not match up so you have to remove it. I used a box knife to shave it off since the plasitic was relativly soft.

Have fun!

[Jagdpanzer]

Does anyone know if the ACC-150821 injectors are also specified for the later 405 hp LT5 engines?

Thanks Tom! I got them from Summit Racing which wasn't too far from me.
Part number ACC-150821 which is a set of 8 so you need 2. Total cost was
$579.72. When you install them, use the outer ring slot on the end of the injector when you clip them in to the fuel rail so as to keep the distance the same as the old ones. Also, the secondary injectors' plug have a notch guide that does not match up so you have to remove it. I used a box knife to shave it off since the plasitic was relativly soft.

Have fun!

[Norsky4360]

I swapped out the full set over Memorial Day weekend on our '90 to the Accels (also got them from Summit). Used the outer slot as mentioned above and also shaved the guide as mentioned above. Runs like a top again!

[swaindm]

I take it you mean ACC-150824. 821s only have a flow rate of 21 lbs/hr. 824s have the correct flow rate of 24 lbs/hr. '93 has same flow rate as 90-92. '94 and '95 have a flow rate of 26 lbs./hr. Dennis Swain
Whoops! ACC-150821s are correct for stock application. Can't keep research straight. DMS

[ROGER E]

Uh oh. Please don't tell me I installed the wrong ones. I got the part number from posting in this thread:

http://zr1netregistry.com/forum/showthread.php?t=3017&highlight=150821

To make matters worse my engine is a 91 with 94 heads. It runs great but if there's room for improvment please do tell!

[mrzzzr1]

Kurt White "White Racing" states R/C injectors are as good as it gets. I got mine for $68 each from R/C direct in Ca. Had to buy 8 primary o-ring seals that were not included and they were very pricey through a Buick Dealer my mechanic deals with. I suggest looking elsewhere for the seals.

[swaindm]

150821 is correct! I was confusing some non stock applications. Sorry!!:o DMS

[ROGER E]

150821 is correct! I was confusing some non stock applications. Sorry!!:o DMS
Cool!

[ffvetteman]

Whew you guys got me nervous for a minute there!!! I got 16 150121's sitting on the table in front of me ready to go in.

This week I hope:thumbsup: Just need to get a hold of a set of spark plug wires now.

[george henry]

Hello. Just replaced all 16 injectors with Accel part number 150121 from Atlantic Speed for about $500. This took care of my high idle problem as well as a bad lack of power (bad stumble when the secondaries kick in), also replaced the PCV hose with the unit from White Racing and got new PCV valves. The old hose was a loose fit to the valves and this probably contributed to the high idle (1200 rpm), it now goes right to 750 rpm after start. The injectors were the originals and ethanol had taken its toll on them. I was a first timer on the plenum removal, it's not that big of a deal.
1990 #1507

[george henry]

Hello. Just replaced all 16 injectors with Accel part number 150121 from Atlantic Speed for about $500. This took care of my high idle problem as well as a bad lack of power (bad stumble when the secondaries kick in), also replaced the PCV hose with the unit from White Racing and got new PCV valves. The old hose was a loose fit to the valves and this probably contributed to the high idle (1200 rpm), it now goes right to 750 rpm after start. The injectors were the originals and ethanol had taken its toll on them. I was a first timer on the plenum removal, it's not that big of a deal.
1990 #1507

[zr-1assassin]

Whew you guys got me nervous for a minute there!!! I got 16 150121's sitting on the table in front of me ready to go in.

This week I hope:thumbsup: Just need to get a hold of a set of spark plug wires now.there is a new set on ebay with both pcv's!

[george henry]

Just read Roger E's post about using the outer slot on the injector for the clip to the fuel rail (the slot next to the o-ring?) I just pushed them into the rail and used the slots that look like they were made for the clip. There were no leaks and it runs fine. Does anybody know how much difference this makes? Should I worry?

[Jagdpanzer]

So do the Accel 150121 injectors work in both the 375 and 405 hp LT5 engines?

[HIZNHRZ]

Both Accel and RC injectors are made by Lucas. Accel injectors are made to the OE spec where the flow rate of each injector is +/-3%. RC injectors are more expensive because they are hand selected into sets that have flow rates +/-1% from injector to injector.

[GOLDCYLON]

Both Accel and RC injectors are made by Lucas. Accel injectors are made to the OE spec where the flow rate of each injector is +/-3%. RC injectors are more expensive because they are hand selected into sets that have flow rates +/-1% from injector to injector.


Im not sure thats true I think RC makes there own but they are a simular lucas design. You are correct on the hand selection for the matching flow rates but the RCs are also using a stainless sleeve (Accel something else) which was a big reason I went with them as my orginal injectors we all rusted.

[GregCrowe]

I've been putting off the injector fix for over a year now......... no time. I see the prices have come down significantly. When I buy the 2 sets of Accel 150821's, do I need an O-ring kit? Seems like I remember something about needing an o-ring kit for the secondary injectors ???

[1990 quasar blue]

No O-ring kit needed. I asked Marc myself.

[bradslt5]

i just got my car 2 wks ago and its now got A MISS how can one ck the injectors i got an extra set with the car . can one ck them off the car .?

[tomtom72]

You can do an ohm test. The FSM says to check the injectors cold ohm readings and then re-check the ohms when the motor gets to closed loop temps. There is a thread here with the method to do the ohm testing thru the ECM plugs.

Are you suspecting the injectors as the source of the miss? A scan of the motor from open loop temps thru closed loop temps will show if you have fuel issues. The O2 cross count #'s and the Block Learn #'s and the Integrator #'s will be off. There is a page in the FSM in section 6E that gives a snap shot of what the closed loop data for a normal motor should look like on a scanner.

:cheers:
Tom

[tccrab]

i just got my car 2 wks ago and its now got A MISS how can one ck the injectors i got an extra set with the car . can one ck them off the car .?

This is what you need to know:
http://zr1specialist.com/HAT%20Web/articles/FI%20Resistance.htm

Good luck!

[janozr1]

So guys ,
after all reading still dont know what part nmb. injectors for my 94 Z 405hp
I need ,(21,24 or 26 lbs/hr ....stock replace), are prim .and sec same ???? and where is best choice to buy them ...who will send them oversea ???
tnx for replays
regrds,Jano

[GOLDCYLON]

So guys ,
after all reading still dont know what part nmb. injectors for my 94 Z 405hp
I need ,(21,24 or 26 lbs/hr ....stock replace), are prim .and sec same ???? and where is best choice to buy them ...who will send them oversea ???
tnx for replays
regrds,Jano

The RC injectors part numbers you need are part numbers SL-205s. Yes both the primaries and secondaries are the same but you will need to remove the tab on the secondaries. RC Racing normally will do this for you if you buy their injectors and tell them they are for a ZR-1

http://www.rceng.com/

[DaveK]

The RC injectors part numbers you need are part numbers SL-205s. Yes both the primaries and secondaries are the same but you will need to remove the tab on the secondaries. RC Racing normally will do this for you if you buy their injectors and tell them they are for a ZR-1

http://www.rceng.com/


Would that be the SL4-0205 injectors? I can't seem to see anything else close on the RC website?

Thanks

Dave

[GOLDCYLON]

Would that be the SL4-0205 injectors? I can't seem to see anything else close on the RC website?

Thanks

Dave

Yep those are the ones.... SL4-205s

[bradslt5]

You can do an ohm test. The FSM says to check the injectors cold ohm readings and then re-check the ohms when the motor gets to closed loop temps. There is a thread here with the method to do the ohm testing thru the ECM plugs.

Are you suspecting the injectors as the source of the miss? A scan of the motor from open loop temps thru closed loop temps will show if you have fuel issues. The O2 cross count #'s and the Block Learn #'s and the Integrator #'s will be off. There is a page in the FSM in section 6E that gives a snap shot of what the closed loop data for a normal motor should look like on a scanner.
I scanned the car at idle blk learn is 115 left and right both in open and closed when cruizing 70 mph 115 left and 120 right . this stuff is new to me i have no expierence with computors itegraters were 132 -134 .does that mean my injectors are off
:cheers:
Tomi scxanned the car at idle115 both left and right cruizing 115 left 120right intigrators132 l 134r cross counts left alot slower than right . i am new to this stuff dont know what to do ? also what is FSM? sorry if its a dumb ?

[GOLDCYLON]

i scxanned the car at idle115 both left and right cruizing 115 left 120right intigrators132 l 134r cross counts left alot slower than right . i am new to this stuff dont know what to do ? also what is FSM? sorry if its a dumb ?

Dont feel dumb

FSM = Factory Service Manual or the big red book! GC

[bradslt5]

where can i get one? thankyou for helping this new guy:cheers:

[GOLDCYLON]

where can i get one? thankyou for helping this new guy:cheers:

Ebay has them all the time. Also you could post here what manual you are looking for and for what year Z. Just make sure you buy the large red book or books not the white ones.

Also any C4 Manual for your year will work. A smaller red book is available as the electrial supliment as well as the LT5 Engine supliment. Going rate on these used is around $50-$75 or you can go to Helms or Madvet.com and fork out the $130 new price.




Happy hunting GC :cheers:

[blackjack]

i have a spare set of the red books...new...pm me if youre interested
bj

[GOLDCYLON]

See there you are behold the power of the forum!!! :thumbsup: :hello:

[bradslt5]

I just love a profit . very cool very cool indeed!!!!!!!!!!!!!!!!!!!!!thankyou profit man you are gold for a reason

[GOLDCYLON]

I just love a profit . very cool very cool indeed!!!!!!!!!!!!!!!!!!!!!thankyou profit man you are gold for a reason

Did you pickup the FSMs:happy1:

[tomtom72]

Brad,

Okay I'm not an expert on FI cars. If you go to page 29 in this section of our forum you will see a thread about scan tool data interpretation. The thread is at the bottom third of the page and it has some long distance "interpretation" by some of the more experienced guys in our registry.

Off the top of my head your Integrator numbers are a bit off....but if the O2's are going lazy on ya that could account for the readings....I just can't say for sure that an O2 malfunction yields a miss....I can't logic out a connection from bad O2's to a miss. At my level of experience I'd need to go thru the usual suspects, plugs, wires, coils, does motor smell lean or rich....ya know the old school stuff I learned about carbed motors....but on my car's miss the int #'s were off and I could smell a lean condition @ the tail pipes...hence the scan data confirmed bad injector coils...as the motor was way lean from the injectors not spitting any fuel on one bank and the other bank showed the good injectors responding to a prompt from the ECM to spray more fuel to overcome the lean condition.

Sorry I am not more accomplished in my knowledge to point a finger at the root caus in your situation. The sucessful diagnostics of these cars really required a noob like me to have a FSM, Factory Service Manual = Helms.com.

:cheers:
Tom

[bradslt5]

as an old carb guy i know what you mean but thankyou very much for the info . its nice that you care that much to share the knowledge that you have . i am becomming very happy that i frequent this site and hope as my knowledge increases that i can give back with the same kindnees and honesty that you have shared with me . again thank you :thumbsup:

[QB93Z]

Brad,

Okay I'm not an expert on FI cars. If you go to page 29 in this section of our forum you will see a thread about scan tool data interpretation. The thread is at the bottom third of the page and it has some long distance "interpretation" by some of the more experienced guys in our registry.

Tom

Tom, I am trying to find the thread about scan yool interpretation that you refered to, but have been unsuccessful. Can you give a hyperlink or a thread number reference?
Thanks, Jim

[tomtom72]

http://www.zr1netregistry.com/forum/showthread.php?t=896

My GF just taught me how to do that!

[QB93Z]

Tom, Thanks for the link. I found what I was looking for. :thumbsup:
Jim