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Old 02-25-2013, 06:11 PM
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Rough Idle and Start

I have a 99 F-550 with 122,000 miles on the engine. Here's my problem. The truck cranks for about 1-2 seconds before it will start. After starting the engine it will idle fine, but after I rev it up it idles very rough. It seems to have plenty of power at high rpms. Here are some things I've already checked, fuel pressure, fuel pressure regulator, new fuel filter, micro screens in the fuel tank , new injector wiring harness. Does this seem like a electrical or fuel problem?
I would appreciate any help. Thanks
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Old 02-25-2013, 10:44 PM
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checked codes?
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Old 02-26-2013, 05:03 AM
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Yes, the scanner didn't read any.
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Old 02-26-2013, 09:08 PM
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have you run an injector buzz test?
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Old 02-27-2013, 03:04 AM
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What scanner did you use? The cheaper one will not read everything on these diesels.
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Old 02-27-2013, 05:47 AM
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No I didn't do a buss test, but I know that the injectors are good. Here's why. I did a long block swap. The engine that's in the f-550 now, came out of a f-350 that I owned which was in a wreck. But that engine ran perfect when it was in the f-350. I switched engines because the original engine in f550 had bad compression and had this same problem Rough Idle and Start. To answer the other question, I don't remember exactly what tester it was. It was either a Matco or Snap-on, one of the two.
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Old 02-27-2013, 08:23 PM
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ok. so it is likely something that was not swapped over then.
run a buzz test anyways. this tests the entire circuits. including the idm
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