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So I've been trying to hunt down this surge at idle. Happens in Park and neutral, and sparingly in drive. Cold or hot same issue. So what I've ruled out I guess,(not a professional by any means) but I have replaced the EBPS and tube within the last 9 months, CPS is about 2-3 months old (blue ford one), ICP 1 month old, injectors replaced within last 300 miles, Vehicle speed sensor in the diff. Unplugged MAP no change. All wiring to sensors are free from any fluid contamination. I have recorded the following values via Scangauge (wish I had AE)
I have a pillar mounted low pressure oil gauge it also surges 10 psi along with all this at the same time.
My biggest question is would or should the IPR duty cycle increase during all this or stay the same, I would beleive it should increase (like I said no expert). Also the scangauge is telling me that the computer in reading .3 boost at idle which I think to be unlikley so I'm not wondering if its MAP related. I'm thinking its between these two, I just don't want to through parts at seeing as both of these could total up to a 300.00 wrong diagnosis.
Any input would be much appreicated
Thank you in advance
95 7.3 ECLB, 2WD, E4OD, Rosewoods 1.5's, 6637 Riff Raff, 3" DP to 4" Exhaust, Gauges (EGT, Trans, Oil Pressure, Fuel Pressure), ScanGauge2, Firestone Air Suspension (rear), CCV Mod, efuel