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1994-1995 5.0 Mustang SN95 Tech Forum

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Unread 02-24-2012   #1 (permalink)
nielsensmn is offline Apprentice

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Default 94 GT Fuel Injector

I currently have 24lb injectors in my 5.0, but have been told they are the wrong size for the engine. So, I'm planning on putting my stock 19lb injectors back in the engine. I was looking them over the other day and noticed all were in great shape except one of them. The bottom portion, which is mounted in the engine area, has a small portion of the lower lip broken off. The plastic O-ring is still intact and not falling off, but if I put it back in the way it is, will it effect the performance of the engine? Should I considering looking for one used fuel injector just in case?
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Unread 02-24-2012   #2 (permalink)
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your car will run just fine with the 24s. I did it for a long time, and would continue to if I still had mine. It won't mess anything up, it's a minute difference. You don't need a tune, and really don't even need a different MAF sensor.

In other words:
It's not worth the work to change them, you are not helping anything or saving your motor from damage or lost fuel economy.
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Unread 02-24-2012   #3 (permalink)
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Moe, I think the reason he was putting the stockers back in was because his car wasn't running right and it was before he changed the injectors. I can't remember, but I think he said he didn't have a calibrated MAF or a tune (OP, please correct me if I'm wrong here).
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Unread 02-25-2012   #4 (permalink)
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Correct, the car wasn't/isn't running corectly. I do have the matching 24lb air sensor for the 24lb injectors. I'm just going to swap out the 24lb with my stock 19lb and change the injectors back to the originals.
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Unread 02-25-2012   #5 (permalink)
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I wanted to say I was going to swap out the 24lb air meter with the 19lb air meter.
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Unread 02-25-2012   #6 (permalink)
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Quote:
Originally Posted by YLDPONY View Post
Moe, I think the reason he was putting the stockers back in was because his car wasn't running right and it was before he changed the injectors. I can't remember, but I think he said he didn't have a calibrated MAF or a tune (OP, please correct me if I'm wrong here).
lol...moe

anyhoo, cool. Must've been something I didn't know about. Good luck getting it to run better! Perhaps it was an issue with a couple of the injectors...heck if I know, didn't even know it wasn't running right. :hihi:
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Unread 02-25-2012   #7 (permalink)
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24lbs really isnt nessesary if you have a stock setup. If you think about it the only reason you need more fuel is if your getting more air... Basic performance theory.. If you have a stock setup why would you tamper with what FORD has calculated would be the right size injector.. The only tiem you should consider changing injectors is if your changing your heads and cam. That will make a big enough difference in airflow for those 24lbs injectors to be neccessary. A CAI wont cause even close to a big enough demand for that fuel.

I also suggest you replace the O-rings everytime you pop those injectors out. It may not be neccessary and some people will argue that but it is very good practice and good insurance that you will never have a vacuum leak or a fuel leak at the injectors.
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Unread 02-26-2012   #8 (permalink)
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Thank you all for your answers, but my main question is not about the 24lb injectors. It's regarding the broken lip on the bottom of a 19lb injector, the part inside the engine area. Will this chip, which is about 1/3 of the lip, affect the performance of the fuel injector?
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Unread 02-26-2012   #9 (permalink)
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I think what you're talking about is the "hat". If so, no, that will not affect performance at all. If you want, you can get a fuel injector rebuild kit for ~$3. I'll share the link when I get back to my place tomorrow. Also, if you get a chance, post a picture of the damaged piece.
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Unread 02-26-2012   #10 (permalink)
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Alright, here is what I said I would link to:

Fuel injector cleaning - how to

Injector Rehab - replacement parts
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