I have a 99 f-250 with about 250k miles. Truck is completely stock. It recently has developed a problem where when I start it in the mornings it surges at idle, 200 rpm or so. Sometimes it tries to die and did once but started back up. When driving it continues to rev itself up and is jerky. It runs rough and sounds like it could be missing on a cylinder. At other times it runs fine just like normal. Yesterday morning it started with these symptoms so I put in a new ford CPS. It ran great for about 100 miles that afternoon. This morning it started back with the same symptoms. The SES light stayed on longer than normal when I started it, but it went off. I don't have a scanner.

I thought it might be water in the fuel because this started the day after I filled it from my transfer tank. But the water in fuel light has never came on. I put a new fuel filter on it but it made no difference. Have pulled filter three times looking for water but never found a drop. Also pulled several buckets from the bottom of my transfer tank but found no water there either. Any ideas on where to look next? I appreciate any help!

 

What engine oil are you using? Does it just do this when cold? Does it ease up if you start it after it has been plugged in for a while?

 

I am running rotella 15w40 oil. It does it more in the mornings but has done it in the evenings as well after it has been drove some throughout the day. I haven't plugged it in lately so I'm not sure about that. The temperature has been in the 90's here during the day and mid 60's at night. Pickup starts good.,

After some reading, I pulled the plug off the ICP. It had oil in it. I've left it unplugged and it has ran fine the 25 miles I've driven it since. Not to say that it won't mess up again but it hasn't yet. I might try driving with it unplugged this weekend and if it doesn't mess up again I'll get a new one. Thanks for the help!

 

Intake/Exhaust Restriction

Perform KOEO on Demand Test

Retrieve Continuous Trouble Codes

KOEO Injector Electrical Self-Test

Fuel Pressure Tests

Injection Control Pressure Tests

Cylinder Contribution Test

Boost Pressure Test

Data List Monitoring Parameter:

ICP, ICPv (KOEO) Spec 0.20v - 0.30v , FUEL PW: 1 MS - 6 MS, V-PWR, DC% - Cranking NTE 20% / 65% is closed. (IPR Suspect), MAT: Manifold Air Temperature the PCM uses this signal to adjust fuel and timing, Known Good Sensor KOEO Voltage:

AP: 5 volts in, 0.5-0.7 volts at idle, 4.5 volts at WOT. PID: AP

BARO: 5 volts in, @4.6 volts/14.7 psi at sea level, decreasing as altitude increases.

CMP: high, 12 volts, low, 1.5 volts.

EBP: 5.0 volts in, 0.8-1.0 volts/14.7 psi

EOT: 5.0 volts in, 4.37 volts@32°F, 1.37volts@176°F, .96volts@205°F.

PID: EOT (degrees)

EPR: Exhaust Back Pressure Regulator, also EBP regulator Output: For quicker engine warm-up at cold temperatures. If the IAT is below 37°F (50°F some models) and the EOT is below 140°F (168° some models) the PCM sends a duty cycle signal to a solenoid which controls oil flow from the turbo pedestal. This causes a servo to close a valve at the turbo exhaust outlet. The PCM monitors the EBP input to determine if the EPR needs to be disabled to provide power for increased load, then reapplies the EPR as load demand decreases until EOT or IAT rises.

IAT: 5 volts in, 3.897volts@32°F, 3.09@68°F, 1.72@122°F.

ICP: 5 volts in, 1.0volt@580psi, and 3.22volts@2520psi.

EXBP 10-15psig w/ EBPV closed and not exceed 45psi at WOT Note: EXBP showing low (3-5psi) that barley rises with acceleration indicates bad sensor or plugged tube.

IDM: 110 volt signal to the injectors. Grounds each injector as fuel is required for that cylinder. Fuel Pulse width is increased to deliver more fuel. The IDM sends a feedback signal to the PCM for fault detection.

IVS: 0 volts at idle, 12 volts off idle. PID: IVS (off/on)

MAP: Frequency output; 111Hz / 14.7 psi, 130Hz / 20psi, 167Hz / 30psi.

IPR: Coil OHMS = 10.2 - 10.6


If you can record data to compare following an event that's great. Then we'll have something definitive to review.

 

I had same problem with my 01. Changed from Rotella 15-40 to Rotella T6. This totally eliminated lope/surge issue. I have noticed a slightly higher idle when engine is hot after running a steady highway speed for a few miles.

 

Just wanted to thank everyone for the help, a new ICP fixed my problem. Drove it for about 5 days with it unplugged and it never messed up again, put my new one in 4 days ago and all is still well! Thanks!