You may end up doing damage to the map sensor and make it read off calibration, and causing some real headaches down the road. The map sensor measures pressure and vacuum in the intake manifold, that's it. Since your jeep is naturally asthmatic, the only time it will be under any pressure, is when the engine is off or possible wide open throttle, when there is no manifold vacuum. Even then it would only be atmospheric pressure, not positive pressure. If you are hell bound to tinker with it, get a spare, so that when this one no longer works, you can still drive a vehicle. It differs in how it works versus a MAF sensor, in that a MAF sensor determines air density, velocity, and volume, and in some cases also includes a temperature sensor to measure incoming air temp as well. With vehicles that use solely a MAP sensor, the ECM receives the signal info from the MAP sensor, and with that it watches the intake air temp and coolant temp sensors, as well as throttle position and engine RPMs, and barometric pressure, to determine via a pre-programmed table, how much air the engine is ingesting. I don't recall ever seeing a MAP sensor becoming clogged due to intake sludge, outside of another major failure. This is from 20 years in the business, and seeing 4-8 cars a day, 5 days a week, 52 weeks a year. In that time, I can probably only name three map sensors that actually did fail(failed and had tests to confirm a failure).
Now CRDs, or diesels in general, can be prone to excessive deposits in the intake. I would speculate that the fuel they are using has a real world cetane rating well below what is desired. I saw during a seminar in October covering the new 6.7L Ford diesel, a comparison of two EGR valves, one with twice as many miles as the other. The higher mileage engine had ran a cetane supplement, and the low mileage engine had not. One was almost spotless, and one was coked up bad. Guess which was which? Ford also conducted tests of fuel from all over the country, and the vast majority of the fuel samples tested well below cetane ratings. A little off the original topic, but thought I would throw that in.
