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Discussion Starter · #1 · (Edited)
Hope somebody can help. I bought a 99' F250 Super Duty 2WD with 284,000 on it. I plan on hauling a 30' tag travel trailer and I know this will get the job done as soon as I get it running a little better. Runs rough at a idle until I get the temp up past cold on the factory gauge. It does run a lot better when it warms up. Guy I bought it from said his mechanic had put a couple of aftermarket injectors in it, so I figure before pulling with it, I should do some troubleshooting. Did a buzz test and #1 sounded weak compared to the other 7. After reading on troubles with valve cover harnesses, I figured I would at least install new ones with since it had so many miles on it.
I pulled right bank cover first since that is where #1 is and I found the two injectors he told me about. Pulled the left bank and found this.
2) AB, 4) AB, 6) AB and 8) had AF. 1) AD, 3) AB (alliant brand), 5) AB and 7) AB.
Now correct me if I am wrong, but I believe # 8 is suppose to be AE, and #1 should be a AB like the rest of the Injectors. I dont know if having an off brand compared to the other 7 (Ford I assume) would make any difference. The truck is manufactured on 1/98 but it is considered 1999.
Any comments would be appreciated. This my first time wrenching on a Diesel.
 

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AE was introduced in 2002 to cure the cackle issue. It would never be appropriate to find one in an early 99. AF is supposed to be a long lead injector like the AE, but I've never seen one. I suppose a dealer could have installed it and re-programed the truck to run a long lead in #8 in response to a customer complaint about the cackle. The sure cure for this is to by a set of remanufactured injectors from Casserly (Full Force Diesel) and get a complementary tune to drive those injectors. You can get the Cass injectors from DP-Tuner and get a custom tune from them that you know will match the injectors you're putting in. If you do that, I would suggest getting a set of Stage 1 single shots. That will improve your MPG and your HP.
 

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Could also be that the injectors have been rebuilt or exchanged at some point and they just threw any old solenoid at them (they're interchangeable) and the markings don't mean anything.


But a new set from a reputable shop like RT suggested wouldn't hurt.
 

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Discussion Starter · #4 ·
Thanks guy's. I guess if I want to know for sure what I have, I should should put a true balanced and tested set in. Makes sense.
 

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I would make sure everything else is in order (oil, fuel, etc) before throwing injectors at it.
 

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Discussion Starter · #6 · (Edited)
It has been running already. I have put around 200 miles on it and everything else is fine. Picking up an AB and an AE code injector today to help match things up a little better. Also need to fix the oil dipstick flange adapter before firing it up again. Read on the other forums about the tricks to fixing that also. This is a very helpful website. Thanks again guys.
 

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Remember, AE was never an option in your 99. It's a different capacity injector. Stick with all ABs in every hole.


Sent from AutoGuide.com Free App
 

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Dually, T500, S&B intake, 4 inch exhaust, BTS Tranny, WW2, bags, front mount hitch, crap EDGE CTS
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Would be interested in hearing how this story played out if the truck is still running.
 

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Would be interested in hearing how this story played out if the truck is still running.
Azoutlaw apparently created a second discussion and was last seen on June 10, 2016. However, that second discussion doesn't seem to be obtainable by me. Possibly the second discussion might give some clue as to how it all turned out, however, I can not confirm that one way or the other.
 
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