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Bad lope at idle
Need some help here. So after some work my truck is having a hard time at idle or when you give it fuel and have to come off the pedal completely. This is regardless of cold or hot. Goes away once rpms are up (say over a 1000). The high idle mod when on it runs smooth. Driving down the freeway it runs smooth. When I first start it will idle up to about 650, run smooth for about 5 or so seconds then settle out and start loping, then it will smooth out and idle fine. If I give it a touch of fuel then let off throttle it drops back into the lope for a little bit then smooths back out. The lop generally last for a little while when it starts until it smooths out. Sometimes it last longer then others.
Today it stalled out when I let off the fuel and had to come to a quick stop.
There are no codes coming up via my CS or SCT x4. Throttle response is good as far as I can tell, power is good, no smoke or anything abnormal from tail pipe.
Ive got tunes by Gearhead running slr, it did this before the tune though fyi.
History of work I did before this happened. When I had the truck new it ran ok but didnt do this lope thing. ICP sensor was leaking oil.
I went in and replaced oil cooler, exhaust 4 inch, MTW stage 1, front engine cover with new water pump from 05 truck, new lpop, fresh coolant (twice lol), first oil change 5.40 syn, just changed it again. New oil filters and fuel filters oem. New rebuilt FICM also.
I replaced the ICP sensor and rewired the pig tail, got a new one coming just incase but it should be good. Replaced the IPR filter and the one under the oil cooler. IPR filter was good just slightly concave.
I just replaced the oil tonight with rotella 5 40 syn, and added some archoil to it. Gonna drive it tomorrow and see if that helps. Any ideas are welcome. Ill try and get a video of it doing it tomorrow after work.
2003 F350 Lariat 6.0L
MTW stage 1, 4" MBRP, IPR coolant filter, 05 front cover and water pump, everything else pretty much stock.
Last edited by Quint; 07-13-2014 at 11:03 PM.