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I can think of a variety of options keeping in mind that the MAP sensor is high on the back of the engine and not really exposed to dust or water so that the seal is critical as opposed to like an external transmission sensor plug. That said:
1. proper size "O" ring(s) might do
2. a cut to fit piece of ethafoam (closed cell somewhat hard but spongy packing commonly used in electronic pkgs) might do.
3. quality electrical tape
4. fill the gap with dielectric grease but I'm not sure it would stay
5. check local junk yards for a CRD or GM product that uses the same sensor (NOTE the GM PN 55206797 MAP sensor is identical) and scavenge the pigtail
6. check with DCJ or GM parts for the pigtail. I know GM pigtails are available for ca. $10 but I cannot help you with what GM vehicles use the PN 55206797 sensor.
Be careful if shopping online for a MAP sensor seal as what that usually translates to is the "O" ring on the shaft of the sensor not the wiring plug seal.
A way out idea is a bead of silicone seal around where the seal used to be; plug things together; let silicone set. Shouldn't stick well enough to glue things together but might very well fill and adequately seal the gap. Just be sure to keep it off the contacts lest you seal out current flow.
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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs
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