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5.4L problems

Old 02-17-2008, 11:06 AM
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Default 5.4L problems


I have hed my truck for a little over a year. I am a second owner of a 97' F-250. For as long as i can remember it has had like a "surge" or the engine will pick up then die down at 1500 RPMs. I have been totally baffled by this. to make a long story short the turck has spent a lot of time in the shop and i have yet to figure it out. I have replaced the plugs and boots. Thats about as far as I got. It didnt make a difference at all so i took it to the "proffesonals" they have messed with all parts of the EGR valve. Last i took it to a mechanic who replaced some DPTV sensor. it helped slightly. He also mentioned a program out that FMC came up with to "fix" these troubleshooting problems. If yall have any ideas or anything like that it would be greatly appreciated.
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Old 02-17-2008, 08:45 PM
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Has the Idle Air Control (IAC) solenoid been inspected and/or cleaned?

'Check Engine' light on while engine is running?

Do you mean it idles at 1500 RPM? If so, have you checked for any vacuum leaks?
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Old 02-19-2008, 08:10 PM
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Default idle high or up & down?

If I'm not mistaken there is a rubber elbow on the back of the intake plenium. If you are having an up down or high/rough idle it could be that the rubber boot has dilapidated and collapsed causing it to tear thus leaking air. Seen the problem before if I have your symtoms correct. The boot is hard to locate. Using white lithium spray the back of the intake while the engine is running. This applies to the 5.4 engine.
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