AD injector instead of AE on 2001 7.3

[witt89]

Ok so I have have a few drivability problems and I have been able to fix them so far. But I just put mbrp 4" with muffler and tip on my 01 and now I have a noticeable miss sound at idle and low rpms. So I had it scanned and the buzz test was good but it said #8 failed on contribution. So I knew that injector had been replaced before so I took the cover off and the wiring
Connectors was fine and running it flowed oil just fine out the discharge port but I noticed it was a AD injector instead of a AE. So will that cause the miss sound and will it harm that cyl. By continuing to run it. And the sound is a miss not a flutter. It almost sounds like a bad valve but the exhaust is smooth flow out no sucking back like and exhaust valve. But it runs fine and smooth through the rpm range. It just sounds bad. Thanks

[witt89]

[witt89]

[blue99stroker]

the #8 injector is a long lead injector it is different than the other injectors. it gets starved for oil so it is designed with a longer ttip.
i have a slight miss at idle as well. but no codes or anything ever.
and my truck runs great.

[dentexpowerstroke]

I had a miss in the exhaust sound and it was a bad injector. Usually that miss sound is a bad injector. The only thing is cylinder contribution tests fail #3 and #8 a lot, has something to do with what cps you have. Buzz test it and see what it does.

[timmyboy76]

only thing i can come up with, for the #8 being replaced with the same as the others, is that the P.O. had a regulated return. If your system is deadheaded, i'd put the long lead injector back in.

[dentexpowerstroke]

After market injectors don't use a long lead

[timmyboy76]

Originally Posted by witt89

Connectors was fine and running it flowed oil just fine out the discharge port but I noticed it was a AD injector instead of a AE.

dentex...AD's are not aftermarket.

[dentexpowerstroke]

I'm saying after market injectors don't use a long lead, its not necessary. BTW after market injectors don't get a new code. Mine are ab codes (split shot) and they are single shots. The injector code doesn't mean anything if they have been changed over. The ae in the #8 slot is not necessary.

[witt89]

I don't have aftermarket injectors they are stock. But for one reason or another the #8 was changed at around 80,000 mi. And when they did it they put in a AD, and I wasn't sure if the ECM have to be rolled back to pre 99 1/2 or if I was damaging the cyl. By leaving it. But would that cause a miss sound if the ECM had the wrong flash for the AD injector. And it has the flutter sound like the pre 99 1/2 7.3s. I spoke with the ford tech and he said he knew they changed it for the sound complaints of the earlier 7.3s but didn't think I had to reflash the ECM and it shouldn't hurt to run it. But if I thought it was going bad again to make sure I had no less than 400 psi compression and if I did have over 400 psi that the injector could be failing.