Fordracer Posted October 3, 2014 Share Posted October 3, 2014 I have a 2002 7.3 with 71,000 miles on it that randomly makes the truck jerk under accel usually above 50 mph. It feels worse while pulling a trailer. I made recordings of it and the rpm will first drop 170 and then jumps up 370 and the ICP voltage drops .5 volts and jumps up 1 volt. It does it very quickly and then comes back down to normal. I have to enlarge the recording to get a good look at it because it's so quick. I repaced the ICP sensor, it still had the original style sensor, and he said it helped alot but it still does it. So next I replaced the ICP connector and it made no difference. I put in a test IPR with no help. It sets codes P1211 and P1247-turbo boost low. I don't know if it's a VREF problem, cam sensor, or high pressure oil system problem. Any suggestions? Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted October 4, 2014 Share Posted October 4, 2014 Check your main harness by the left valve cover. I've seen some issues with rubbing there. I also had a bad vref splice on a 97 that would stall that was in the same area of the harness. Quote Link to comment Share on other sites More sharing options...
Fordracer Posted October 24, 2014 Author Share Posted October 24, 2014 I checked the harness at the valve cover and everything looked good. I decided to go after the low boost code and found the MAP sensor was 2 pounds lower than BARO so I put a new sensor in and it still read 2 pounds low. After testing the wiring I put in my spare PCM and the sensor started reading correctly and the surge was gone. I sent the PCM in to Reman Auto Electronics and they rebuilt it and it works great. 1 Quote Link to comment Share on other sites More sharing options...
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