I have a stock 91 TA 305 TPI 5 speed and have been troubleshooting a "stumbling" problem with my local shop. After checking the fuel filter and the operation of the coolant temp sensor, fuel pressure regulator, fuel pump, and EGR, the shop is recommending I swap out the injectors. I have the originals in the car with 150K on them.

The shop will install what ever I want and I would like to know what members think about the remanufactured Bosch 3's from Southbay or FIC. Looking around, I think these are the best for me but I would like to know what others think. The injector prices are all over the map from $1,500 a set for AC Delco down to the reman Bosch's at under $200. There must be something I am missing, other than the fit issues some people have had. Please help me make the decision. I want to make a choice quickly.

Thanks.

 

There's INJECTORS PLUS TOO!

We make these injectors all day long and have a lifetime warrantee. We have never had to replace any under warrantee. We are just that good. (shameless huh)

The question is who is rebuilding them will determine the quality of the product. We take the upmost care and use only the best cores on the market. It all starts with the core.

Call me at 201-258-5600 we'll take care of everything you need.

 

I got reman injectors from RockAuto and they work just fine. I think they were about $30 each. I put them in myself so no shop cost.

 

It is totally your choice as to which company you decide to go with, but the bosch lll's are the way to go....hands down

www.southbayfuelinjectors.com
516-492-6504

 

im a mechanic and i have no problem useing reman injectors. Python makes a good reman injector you should check em out

 

Hello southbay08!!

I'm about to push the order button, do you have any special promo code that I can enter?

 

Yes, it is TG11

 

Hello southbay08!!

Thanks a million!!!



P.S. Check my PM back to you!!

 

Thanks for the help and advise here and on the phone. After talking to all the Bosch reman providers, I bought them from Jon and Bill at FIC. Good price, good advice, and I could pick them up at their location while I was visiting family in the Atlanta area. Installing next week when I get back to Florida.

 

As we discussed on the phone, there's good rebuilds and bad. You got one of the good ones, I'm sure they'll work great for you. They have great business ethics too.

Good luck!

 

Last thought before changing the injectors - Is here anything else I should change or test while the fuel rails are off? No other control components have ever been changed in this car like EGR, Throttle Position Sensor, Fuel pressure reg, etc. I am changing the fuel filter and had the fuel pump checked out already. I am looking to avoid taking it apart for another reason soon after replacing the injectors. Any suggestions for me?

Thanks.

 

you want to make sure everything is in good condition, but its a guessing game with old used parts. so its your call to replace the other parts or not.
on the fuel pressure regulator, i say go ahead and replace it. when i did my injectors i didn't change the regulator. a week later i had to tear it back down because it started leaking into the vacuum hose.

 

Thanks. That's just the type of advise I am looking for.

 

That's why I don't see those screw on cap things. More trouble then they are worth. They are junk.

All brands, not one in particular. The vacuum line fitting breaking off is a common problem, as well as the screws not staying put and pressure being a moving target.

I just modify a GM one. It's more expensive but I bet you'd spend another $70 not to tear it down again.

 

I am a very happy customer of southbay. I have the same engine as you and I bought the stock replacement Bosch III's. They are great, and I got an awesome deal!

 

I am looking forward to the same results. I spoke with Southbay before I bought from FIC. They, too, had a great deal on what I think will be a good solution to my hesitation problem.

 

When you do injectors. It is good to run before and after scans to monitor your INT and BLM's. Some run lean with the Bosch III's.

 

OK, Joshwilson3, but help me out. What are INT and BLM's? This old dog must need to learn something (and maybe buy something!).

 

Did you get the gasket set and o-rings? Be sure and check you fuel rails for leaks before you put it back together. There's a good YouTube video showing step by step on how to do it! Piece of cake!

http://www.youtube.com/watch?v=49WXmzfOy4k

 

Sure did, texascat2. FIC made sure I had what I needed. I would not have thought of the O-rings for the fuel rails. As I said in my initial post, I am having a local shop do the work. I just bought them the "right" parts and provided FIC's instructions about "intake side first". I should have the car tomorrow and I'll see how they did. If there is a problem, I'll tell them about the youtube link!

 

INT and BLM tells you if you are running lean or rich. You have to have a scanner. Or datalog on a laptop to read from the cpu. Just search on Google on the Block Learn Multipler (BLM). When you scan, it lets you know alot of other things as well.

Here's something:

www.gnttype.org/techarea/faq/BLMINT.html

 

Alright! Good deal, let us know how she runs when you get her back. Mine idled and ran better then she ever did before.

 

OK, I did not get the laptop software and cable until after I swapped out the injectors.

After reassembly, I had a vacuum leak, and got lots of bad readings. I fixed that, and also I think I might have been using the wrong data definitions. Now I get no readings out of spec, but the BLM is at 150, which I know to be at the high end of things.

I'm not sure what I would need to do to get it to read at or near 128.

Any suggestions?

 

What injectors did you put in?

That is a high BLM. It is possible you could be running too lean and cause damage. You want to get it as close to 128 as possible.

First thing is to double check any vac leaks. As that could give you high BLM's. If your O2 sensor is original. Then it would be a good time to go ahead and replace it.

There are some other things that can affect BLM's. Probably best to Google search.

Other way to get the BLM's down is to put in an adjustable fuel pressure regulator. And increase fuel pressure. That may or may not work. Other than that would be getting a new chip burned to richen the injectors.

 

I installed a set of Bosch III's. The engine runs really well after I corrected the vacuum leak that I found. Maybe I still have a small one somewhere.

My O2 sensor was replaced when I changed the injectors, along with the MAF, because I was getting a MAF code.

I did notice that the O2 sensor reading seems to constantly swing back and forth, and I don't know if that's normal or not.

 

It's normal for the O2 sensor to swing back and forth.

 

Did you get your car back yet?

 

Texascat2, I picked it up last evening and it runs great (at least coming home from the shop!). I plan to put some miles on today, but the initial ride showed no signs of surging, hesitation, or backfires - a big improvement! Also had the O2 sensor, spark plugs, and temp sensor changed before I swapped out the injectors, but I think the real problem was the injectors. The originals lasted 145K miles so I can't complain!

 

That's good news! Mine had 123,000 on them but I had them cleaned and calibrated about 10 years ago. I needed the new injectors bad. It idles and runs better than it did when new!
Have fun driving!

 

After running for a few days, I am really impressed with the new level of performance the new Bosch III injectors provide. The guys at FIC were spot on with their recommendations and their product has proven to be a great value. I will recommend them to anyone looking to replace their injectors. No more hesitation, surging, or backfiring (really annoying in a convertible!). Thanks, Jon and Bill.

 

I thought Multecs couldn't be cleaned?

 

I knew you would be happy with your choice in FIC and the Bosch III's.
Look at my profile.....FIC, great guys!

 

I got them cleaned and calibrated from a place in La Porte Texas. They're not around any more but there are some other places in Houston that still do it. The Multecs spray pattern is crap. I had a couple out of spec. so I replaced them all and chunked the Multecs!

 

GM says not to clean the Multec injectors. Though, at least they held up for 10 years afterwards. It is best to chunk them anyways, especially with the ethanol in the gas.

 

Why would GM say to not have them cleaned and calibrated? Except maybe to sell you new ones. I got ten years out of them.

 

Never heard of such a thing. The multlecs are "junk" but there is no reason in hell not to clean and flowtest them.
I agree,,the best thing to do is chuck them

www.southbayfuelinjectors.com
516-492-6504

 

Hello All!!

The story that I've heard about the "Multecs" is that the cleaning solutions that are used, are pretty harsh to the "coil" in the injector, and it washes off the protective coating on the wiring, and then you start to have problems pertaining to shorting out!!

That's the story that I've heard!!!

 

GM released a service bulletin back in 91:

"This bulletin has been written to inform technicians of possible damage to Multec port fuel injectors as a result of cleaning."

"General Motors maintains the position that Multec port fuel injectors should not be cleaned."

http://www.corvetteactioncenter.com/...ng+Information

All I've read on about Multecs is to not clean them as it could damage the coil. I've also read that people believe a Multec failure can result from the ethanol in todays gas.

 

Thanks for sharing! Great info.

 

I stand by what I said!!

 

I've also read you're not supposed to put any type of cleaners in the tank with these Multecs. I think the bad Multecs were from 89-93.

AC/Delco. Bottom of first page:

"Pre-1994 Multec I injectors should not be cleaned, and no additives are recommended."

http://www.acdelcotechconnect.com/pd...sb_05D-105.pdf

 

They can be, there's ways to do it, but it's so time consuming and expensive it's pointless.

 

That's pretty much it. New coils can be found in some obscure back hole in China, but why?

 

Hello InjectorsPlus!!

You ask why????

$$$$'s, someone is trying to make $$$$'s!!

 

so is 22# the stock injector for an 89 5.7 tpi formula?
my injectors have 2 part numbers 5230 on one side and 5235436 on the other
im lookin to replace them w/ stock psi rmfcted

 

Yes, stock replacement for a 350 5.7l is 22lb. If you are going to replace
them, get yourself a set of bosch lll's

 

I started this thread back in November. Replaced mine (19# for my 5.0 vs 22# for your 5.7) the first week of Dec and have now run out a few hundred miles with great results. Performance is much better and there are no more annoying backfires. Totally happy with the reman Bosch III's.

I got mine from Fuel Injector Connection (FIC) but they are also available from other sources. Give the FIC and the others a call and talk to them. How they answer your questions can tell a lot about their products. Pricing was about the same for all of them ($150-180 range for all 8 and a few bucks for gaskets) but FIC gave me the best answers and price when I called and visited them in Georgia. Tell them you are a member of this forum if you contact them.

 

FIC is a good company, but they do not sponsor this forum

 

so what! this is a forum owned by a public company. Internet brands, they own like 40 forums. so i know he supports the company because I think they are on 10 or more of their forums. So sponsoring the company that ownes this forum is the same to me, Being a sponsor is good, but not a reason not to shop around. Check out the Corvette Forum once in a while

 

I agree 100%, everyone should purchase from the companies that they are comfortable with. You will never see us trying to take business away from any other company but I know that they offer tgo members a discount, now that is something that i would not consider doing on any of the forums that FIC sponsors. Just sayin