Fordracer Posted June 7 Share Posted June 7 It's been a long time since I posted on here since I quit my dealer in 2017 after 33 years at the same dealer. I'm self employed now and 90% of my work is Ford diesel trucks. This truck is a farm truck that is mainly used as feed lot truck. Low miles, high hours. 127,00 miles, 7,500 engine hours, and 2,155 idle hours. It came in with a check engine light, code P0198, oil temp sensor circuit open. It had a broken wire at the sensor. Weird thing about that is the oil temp in the cluster still worked but the PCM was reading -40 degrees and 4.99 volts. How can the cluster still read oil temp and the sensor isn't connected? The main problem is you can floor it from a dead stop and it barely moves until the RPM reaches 2,000 and then it runs like a bat out of hell. While driving if you coast for a little bit and then step on it, it does the same thing. It's been deleted. The fuel pump was noisy until I replaced the fuel filters. The EBP, Map, and Baro are reading correctly. I replaced the turbo with a Ford one and had to upgrade it to an internal oil supply pedestal. It still does the same thing. I can command the VGT up and down and hear the turbo changing and the pressures go up and down. I tried a Map sensor off another truck, no change. The intake manifold was surprisingly clean along with the Map sensor. Since it runs great above 2,000 RPM I assume I don't have any boost leaks, low fuel pressure, low compression, or air intake restriction. No blow by at all. What am I missing? Quote Link to comment Share on other sites More sharing options...
Fordracer Posted June 23 Author Share Posted June 23 The problem was a bug stuck in the MAF sensor. 2 Quote Link to comment Share on other sites More sharing options...
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