NEED HELP: 19lbs injectors with ebay 173 ecu tuner chip for 19lbs(supposedly)

[Maloney]

Not to hijack this thread (though I guess I am) but I have the MarkD chip that he states in his website is for 17 or 19# injectors (93 octane). My car i('89 325i) s OEM other than that. Is there any advantage to running 19s vs 17s?

ask MarkD yourself!! my guess is you will run slightly slightly richer with 19's and get worst gas milage and not see any noticable power gain but i really dont know how the chip works.

[Maloney]

2 Things

1) Dump GM injectors, they are garbage, grab 19lb Bosch yellows (wrecking yard, 735il, there yah go)
2) Throw the eBay chip away as you have no idea what tune is on there. Its ripped off from someone and you don't really know the specs. MarkD, Conforti/Turner, etc is the way to go.

blaahh.... it is clear that neither of those things is going to solve this problem.... :(

are you positive these are GM injectors??? they have 5 spray holes on the nozzle.


o2 anyone? o2?

[E30-325iS]

If the O2 sensor is stuffed the ECU will never learn a new fuel trim, so you'll have to replace that, but you need to diagnose and repair the problem with cylinder 4 as well.
If you don't know what injectors you've got, why use them ? Go back to stock or get reconditioned Bosch 19#. A quick Google on the part number you posted says they are 25# (260cc) at 3 bar. The 11.8 Ohms nominal impedance is too low.
If you are intent on using them, then at least check that the resistance is about 15 Ohms or risk damaging your ECU.

[vpilarrt]

ask MarkD yourself!!

Tried that, didn't get any response.

[James Crivellone]

blaahh.... it is clear that neither of those things is going to solve this problem.... :(

Really? Why is that?

You are running GM/Denso/whatever crap ass injectors on that motor. They are known to leak past the seals, flood cylinders and do all kinds of random crap to engines they are in.

Why do I know this? I just took 8 of those crappy things out of my 454 Bigblock Truck and replaced with Bosch yellowtops. IE the same freaking injectors I told you to buy earlier.

NOW, on the topic of eBay chips. You have no idea what tune they are, you have no idea where they came from, all you have is a dirtbag who rips off those who tune it. How the hell do you know if they are good tunes or not? He only knows they are for a 19lb / 17lb injector because that is what the chip he ripped it off said on the damn label.

Good Luck!

[DooDanE30]

19lb injectors are outside of the range that a stock chip can accommodate, I believe. The DME can learn an acceptable fuel trim for 17lb injectors if everything else in the engine and management system is working correctly. For the engine to run correctly with 19lb injectors you need a good chip tuned for those injectors. Either you didn't get a good chip or the engine had other problems from the beginning. Get a chip from a reputable source.

Other than a slight increase in fuel mileage from the 4-pintle design of later injectors, there is really no advantage to larger injectors. The stock injectors are more than enough for a stock engine or one with bolt on mods. Only if you significantly increase the mass flow through the engine by internal engine work or forced induction will larger injectors be required. A chip and stock injectors will give the same result.

I couldnt of said it better myself. FYI i tried running 19lb injectors in my car with and without a aftermarket chip and it just never worked. Honestly if you read up enough about 19lb injectors in a stock m20 you will find out that you shouldnt do it. Your just drowning your engine in fuel. If you planned on upgrading to bigger injectors you should of started with 17lbs.

[Maloney]

Really? Why is that?

You are running GM/Denso/whatever crap ass injectors on that motor. They are known to leak past the seals, flood cylinders and do all kinds of random crap to engines they are in.

Why do I know this? I just took 8 of those crappy things out of my 454 Bigblock Truck and replaced with Bosch yellowtops. IE the same freaking injectors I told you to buy earlier.

NOW, on the topic of eBay chips. You have no idea what tune they are, you have no idea where they came from, all you have is a dirtbag who rips off those who tune it. How the hell do you know if they are good tunes or not? He only knows they are for a 19lb / 17lb injector because that is what the chip he ripped it off said on the damn label.

Good Luck!

well it seems no one is even sure that they are GM injectors to begin with... but i am thinking they are the problem (no matter what they are)

Given that:
- there are more cases of ppl USING 19lbs injectors on a stock set up and having them work VS people SAYING the jump from stock injectors to 19lbs injectors is too much and the ecu wont be able to adjust...

- my o2 sensor must be somewhat working because after a couple of minutes the ecu learns a driveable tune... so its not my o2


as for the ebay chip.

the tunes for these chips are EVERYWHERE. so instead of me being worried about not exactly knowing what the tune is. I trust that legit tunes can be found all over the place and the chances are the "dirtbag" ebay seller with 100% feedback is selling a good working chip. its seemingly obvious he is with the all good feedback.
if i had a chip burner i'd blindly DL tunes and try them myself.

you ever read up on tuning or tune yourself?? it is very simple and "professional" tuners are WAY over credited.
its a simple concept to understand and its simple to do its just important that you start at the right spot and make small changes.


will update when i receive my rebuilt bosche 19lbs installed. shoot maybe i will put my stock chip back in to add to the testimonies of how they work with no other mods.

[Maloney]

LOL I ran 22s on my stock ecu just fine

[bernzpeed]

As per experience, 19lb makes the stock m20 run like crap. You need a chip tuned for those injectors to regulate air fuel mixture. Upgrade to M30 afm as well to prevent running too rich.

[Maloney]

If the O2 sensor is stuffed the ECU will never learn a new fuel trim, so you'll have to replace that, but you need to diagnose and repair the problem with cylinder 4 as well.
If you don't know what injectors you've got, why use them ? Go back to stock or get reconditioned Bosch 19#. A quick Google on the part number you posted says they are 25# (260cc) at 3 bar. The 11.8 Ohms nominal impedance is too low.
If you are intent on using them, then at least check that the resistance is about 15 Ohms or risk damaging your ECU.

my problem is i trust people.
I read and i read that you can use mustang injectors and found a list of what injectors come out of what stock mustangs and what size they are.

I went on craiglist and someone was parting out a 95 GT mustAKE, i asked for the injectors, and he had them.
i seen they where black as described in nurmours threads... and i trusted the dude! he was like the nicest mexican i ever talked to...

the 02 must not be clogged as it changes the tune eventually so...

SHIT i jumped on used injectors and got played instead of waiting 5 days for rebuilt ones from MD

[delatlanta1281]

Why don't you just put 14lb injectors back in and run them until you have all the parts needed to build a turbo setup. Quit buying chips on Ebay, quit buying obscure injectors, save your money and build/ tune your car properly.
Just my advice...... but hell what do I or Criv, or Jlevie know? Our cars are tuned and run great.
I mean hell man, MarkD makes a chip for an m30 afm and 19lb injectors. How do I know? I spent the money on that, a known good m30 afm, and rebuilt/ flow tested a set of 19lb injectors before I swapped to my split second set up. It's amazing what can happen when you spent the proper $600 or so dollars to make sure the parts you buy won't blow up your motor.
OR buy a wideband Air/Fuel ratio meter and see what is actually happening.

[kamotors]

cheaping out never works, get a proper chip in there like a Mark D and your car should run just fine and never have to learn the injectors.

[delatlanta1281]

cheaping out never works, get a proper chip in there like a Mark D and your car should run just fine and never have to learn the injectors.

Look at that, another guy who spent countless hours and money getting his car right.
huh.....

[kamotors]

Look at that, another guy who spent countless hours and money getting his car right.
huh.....

yup:) do it right the first time and never need to worry about it ever again;)

[Maloney]

They. Will. Not. Do. Anything. Lol why do people think putting bigger injectors= instant power? 19s and stock chip will just make your mpg worse. That's all. Put stock back in it and be happy.

i never said larger injectors would give me more power lol... i just assume buy larger ones so i do not have to buy them later on down the road