putting 5.0 injectors in a ohv 4.0

[loner4u69]

Can you put 5.0 injectors in a 4.0? will it work with the maf and O2 sensor ? will it get rid of the high rpm ping?

 

[Four0Sport]

i thought both the 4.0 and 5.0 used 19lb injectors?

 

[loner4u69]

How will I find out? I work for ford and they couldn't tell me! So would 24lb injectors give me an improvement or bigger?

 

[Four0Sport]

unless youre doing other engine modifications such as a bigger MAF, TB, exhaust, or computer tune i dont see why you would need bigger injectors. if you put bigger injectors on a stock motor you are going to be dumping WAY too much fuel into your motor, itll just be a waste and cause more problems.

 

[CDW6212R]

Pinging is not caused by injectors. If you have a bad injector, than change it. The PCM is tuned to work with only one injector size. Some 4.0's supposedly came with something besides a 19lbs. model, but I think that it was just a color change.

Search the site for 4.0 pinging, that is common with the pre-95's, and there are many suggested fixes.

 

[loner4u69]

I have 2.25 exhaust with no cats just a muffler and a cone intake filter. I think the engine is runnin lean. The 4.0 is running fine just pings about 4grand. i've tryed seafoam. I read that a chip doesn't do much. I don't want to spend the money on a chip if 5.0 injectors will work they're free!

 

[CDW6212R]

Injectors are balanced in flow with the controlling PCM. Any injector used with a different flow rate will alter the flow of fuel at all times, idle through red line. Do not use a different flow injector ever, without retuning the PCM. Your problem is not due to the wrong sized injector. All vehicles could use a better tune, but none should have the fuel flow changed by a huge amount like an injector change would do.

Look harder at the hundreds of other who have added far more than what you have, and they didn't change injectors.

 

[loner4u69]

ok case closed I won't do it. thanks guys for your info....

 

[GPRACING]

I had a pinging problem with my 94 even on 93 octane.Come to find out the tube from the TB to the air meter had a hole in it on the bottom side.Replaced the tube and now it runs fine.even on 87.hope this helps.