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I am considering replacing my Fuel injectors on my 1989 Formula 350 convertible... I need new ones as my idle is horrible, I feel like it is running on 4 cylinders half of the time when it gets warm...
I want to keep the car as original appearing as possible, I know some things are fine to change, like batteries, tires, and other typical maintenance items as such like hoses etc.
On the one hand I can buy better injectors than what came on it originally, Technology has come a long way and I have heard good things about the Bosh Series III injector, and I have heard good things about the Accell Injectors. They apparently work great, but they do not appear to be stock from the pictures I have seen.
On the other hand I can buy the same factory injectors that appear to fowl out that came on the car. In 1989 they changed the injector for better atomization, apparently that is great for when the car is new, but for cars that are not driven all of the time it creates some problems.
What are your thoughts, should I go all stock or should I get better injectors and not worry about it?
John
__________________ 87 FORMULA - 5.1 LB9/A4 T-tops 3.73 Modified (Yellow/Black)
87 FORMULA - 5.0 LB9/M5 T-tops 3.45 (Yellow/Gray)
89 FORMULA 350 - CONVERTIBLE 3.27 All original (Red/Gray) www.3rdgenformula.com
John,
I had a set of Holley injectors that I put on my 89 Formy back around 2002 and they actually looked almost stock. IIRC there was a slight color difference, the stockers were black and the Holleys were more grey but overall it was very hard to tell that they were aftermarket. I do believe that they did have the number 24 stamped somewhere on the front, but it was very small. 24 was the flow rate, in pph.
I also remember they were $500 some for the set.
IMO, if you're not actually building a car for power, and the injectors are gonna be the only thing that is not stock looking, I would avoid them then. I would either try to get some OEMs or find an aftermarket one that looks very very similar, so that 95% of the people would not be able to tell they are not stock.
I am not up to date on the prices for OEMs but if they are at all acceptable and no reasonable looking substitute is available then why not get the OEMs, they lasted this long, how long is it gonna take for you to double the current mileage on that car?
__________________ 1992 Trans Am "RARE 92" ----- Jamaica Yellow, L98, 147K, All Original CA car 1991 Trans Am GTA ------------*2,800 miles*--1st Place Stock, TA Nats 2009 1992 Trans Am "PMD 92" ------47K, Best of Show, ThirdGen Fest 2008 1989 Formula 350 "PMD 89" ....Sold.... Redline Performance Machines
I am considering replacing my Fuel injectors on my 1989 Formula 350 convertible... I need new ones as my idle is horrible, I feel like it is running on 4 cylinders half of the time when it gets warm...
I want to keep the car as original appearing as possible, I know some things are fine to change, like batteries, tires, and other typical maintenance items as such like hoses etc.
On the one hand I can buy better injectors than what came on it originally, Technology has come a long way and I have heard good things about the Bosh Series III injector, and I have heard good things about the Accell Injectors. They apparently work great, but they do not appear to be stock from the pictures I have seen.
On the other hand I can buy the same factory injectors that appear to fowl out that came on the car. In 1989 they changed the injector for better atomization, apparently that is great for when the car is new, but for cars that are not driven all of the time it creates some problems.
What are your thoughts, should I go all stock or should I get better injectors and not worry about it?
John
John, have you tried sending them away to get cleaned and flow tested? I've done this a few times myself and have been 100% pleased. I know we have a sponsor here on TGO that does this service as well. I haven't used their service, personally, as it's been a while since I've needed such work. But I know some have.
However, I think you will have multec injectors, which aren't known to be reliable and may not be the best option as far as cleaning. That said, I did have a set of multec injectors cleaned a few years ago and they're still working. I did have one of the eight fail, though. When I bought one of my rough Notchbacks, it barely ran as far as idle. I found the injectors to be plugged. The person that flow tested and cleaned mine could not believe they even allowed the car to run - and I think he said it was one of the worst sets he had seen (not my fault, I just had bought the car). He was able to clean all, or almost all, of them.
Just an option to consider. But given the lacking reliability of the multecs, you may want to replace them.
as far as i'm concern i hate multech injectors! They are the worst possible design fuel injectors from GM. Even GM techs say they are garbage since i end up going to a gm training course for IM240 emissions.
I recommend replacing those injectors with a set of Bosch Type designs. They look stock and perform just as good if not better then mul-tech. I learn awhile ago, in 1987, GM had two different type of injectors avalible for our 3rd gens....the multech and the bosch. Multech had the gray cast bodies while bosch had the black bodies. Just about every tech i talked about bosch injectors say they are value for your money plus they outlast the multechs by 10x. Hardly does one ever clog unless you use poor fuel quality and grade. In 1988 GM eliminated the use and the avalibility in their parts catalogs for bosch fuel injectors. Probably because they were too reliable and expensive....
My 89 GTA are running the 87 bosch style design injectors....22lbs is the stock fuel rating. If you want i can try to call my local parts store and see what one would cost ya....laterz
as far as i'm concern i hate multech injectors! They are the worst possible design fuel injectors from GM. Even GM techs say they are garbage since i end up going to a gm training course for IM240 emissions.
I recommend replacing those injectors with a set of Bosch Type designs. They look stock and perform just as good if not better then mul-tech. I learn awhile ago, in 1987, GM had two different type of injectors avalible for our 3rd gens....the multech and the bosch. Multech had the gray cast bodies while bosch had the black bodies. Just about every tech i talked about bosch injectors say they are value for your money plus they outlast the multechs by 10x. Hardly does one ever clog unless you use poor fuel quality and grade. In 1988 GM eliminated the use and the avalibility in their parts catalogs for bosch fuel injectors. Probably because they were too reliable and expensive....
My 89 GTA are running the 87 bosch style design injectors....22lbs is the stock fuel rating. If you want i can try to call my local parts store and see what one would cost ya....laterz
just our two cents, if you are looking for replacement injectors ie (bosch design lll ) or if you would like yours cleaned and flowtested we will be more than happy to help. You can go to www.southbayfuelinjectors.com or you can contact us at 516-492-6504
3 out of the 8 Multechs in my '89 LB9 failed afew years ago (at that time I only had 8 or 9 thousand miles on the car). I wanted to keep everything stock and looked into getting them rebuilt, but they are not rebuildable.
I got a set of flow matched 19 lbs Bosch's from TPIS. They're black and the Mutechs were gray - but oh well.
Why not repaint the new injectors to looks like stock?
Also, why does it matter? They are very difficult to see with the TPI fully assembled and wiring/hoses in the way. Plus, who really can tell for sure "Yep that car is definitely modified. It should have Black injectors!"
I went with the Bosch IIIs and could not be happier. Car has not run this good in years. They were only like $165 from Fuel injector connection. You could always get the multecs cleaned so you at least have them.
I went with the Bosch IIIs and could not be happier. Car has not run this good in years. They were only like $165 from Fuel injector connection. You could always get the multecs cleaned so you at least have them.
Multecs usually fail when they short circuit. Cleaning probably won't help.
when a coil goes bad in an injector you might as well toss it because there is no way to repair it. I have to agree about the bosch lll's we receive all positive feedback on these injectors. If I was going to replace my injectors it would be with the design lll's hands down!
Anyone know what is the stock flow rate for L98 injectors? Does it change with the year?
All this talk about inj replacement has made me realize that the Yellow car is definitely needing some new injectors, so I dug out the stock ones that I pulled from my Formula back in the day and from the research I have done it turns out they are Racetronix 24pph injectors. So they might have been replaced in the past bc it probably came with multecs.
But does 24pph sound high for a stock L98 setup? The car was never modified before I got it.
I'm trying to figure out if my 92 cars have 24pph, bc then I can just rebuild the Racetronix ones and save some down time.
__________________ 1992 Trans Am "RARE 92" ----- Jamaica Yellow, L98, 147K, All Original CA car 1991 Trans Am GTA ------------*2,800 miles*--1st Place Stock, TA Nats 2009 1992 Trans Am "PMD 92" ------47K, Best of Show, ThirdGen Fest 2008 1989 Formula 350 "PMD 89" ....Sold.... Redline Performance Machines
And upon further investigation, I found that the injectors in my 92 car are also the exact same Racetronics/Delphi 24pph. Does anyone else have these injectors on their car? They are black, and D1810BA is stamped on one side.
My injectors are the Gray ones. Ironically I have two gray sets, one from an LB9 that I got with a complete intake setup I purchased for $50, and the set I have on my Vert.
Fuel injectors from 1985 - 1992
LB9
85-86 (1st Des) 17110872 (Bosch) (Ident by RP logo on side of Injector)
85-88 (2nd Des) 10108480 (Lucas)
87-88 (1st Des) 17111960 (Bosch) (Ident by RP logo on side of Injector)
89-92 17112283 (Stamped 5235435 or 86542)
89-92 17112284 (Stamped 5235434 or 86543)
L98
87-88 (1st Des) 17111961 (Bosch) (Ident by RP logo on side of Injector)
85-88 (2nd Des) 10108481 (Lucas) (Identified by "CAV" on side of injector)
89-92 17112285 (Stamped 5235437) OEM Injector # 17086544
89-92 17112286 (Stamped 5235436) OEM Injector # 17086545
LB8 (2.8L V6)
85-89 17111297 (Stamped 5235210)
LHO (3.1L V6)
90-92 17102747
3.8L Turbo
89-89 25519365
John
__________________ 87 FORMULA - 5.1 LB9/A4 T-tops 3.73 Modified (Yellow/Black)
87 FORMULA - 5.0 LB9/M5 T-tops 3.45 (Yellow/Gray)
89 FORMULA 350 - CONVERTIBLE 3.27 All original (Red/Gray) www.3rdgenformula.com
So I would guess that since both my Formula and the JY car have the balck Racetronix Delphi injectors that they both must have been replaced at some point and it may be that the Racetronix/Delphi were the OEM replacements from the dealer?
Otherwise I have no idea where 2 identical sets of injectors came from.
just our two cents, if you are looking for replacement injectors ie (bosch design lll ) or if you would like yours cleaned and flowtested we will be more than happy to help. You can go to 
