Rough idle after injector swap - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 04-03-2013, 04:43 PM Thread Starter Rookie
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Rough idle after injector swap

Over the weekend I put in my swamps 160/100 injectors in my early 99. I have put over 250 miles on it since I changed the injectors. When the truck is cold it idles perfectly on start up. Once it starts to warm up it will have a little shake in the idle, but every once in a while it will idle just fine when warm but it is quite rare. It seems to idle a little low when warmed up compared to when I had the stockers in. As soon as you give it gas the vibration goes away. I do believe that it is something in the tune because once you raise the rpms a couple hundred to where it used to idle it clears up. At full temp it idles just above the 500 mark which seems a little low. Not sure if this is part of the problem but ever since the injector swap the water in fuel light is on all the time. I have drained the separator and put a new fuel filter in when I changed the oil. I will try to take a video of the cold start idle and when the truck is warmed up.
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post #2 of 2 Old 04-11-2013, 05:38 PM Fanatic
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Your truck orginally came with AB split shot injectors. The injectors you have installed are single shot injectors. You have to have a custom chip burned or your PCM reprogrammed to run those injectors or the truck will not run right. My guess is that you didn't get a reprogram or a chip with the injectors?


99.5 F-250 4x4, 7.3 PS
State 1 injectors from Rosewood, GT38 (van) turbo, S&B intake, Comp Cam's 910 valve springs, Smith Brothers pushrods, AIH delete TS 6-position chip. Pyro.

2005 front end conversion, 2008 tailgate, taillights, and rear bumper.

Future Mods:
Edge CTS monitor, and 4" Exhaust (Manufacturer to be determined).
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