1990 Jeep Wrangler TSBs
12 Technical Service Bulletins across 5 categories
Engine
5 bulletinsCONCERNS WITH ENGINE COOLANT USAGE.
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*NLM
VARIOUS CAR OWNER'S HAVE EXPRESSED INTEREST IN USING ENGINE COOLANTS MADE WITH PROPYLENE GLYCOL INSTEAD OF ETHYLENE GLYCOL.
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*YC
APPLIES TO VEHICLES EQUIPPED WITH A 4.2L ENGINE AND FEDERAL HIGH ALTITUDE EMISSION CONTROL SYSTEM.
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FUEL VAPORS MAY CAUSE DETERIORATION OF THE PCV HARNESS ASSEMBLY. THE PCV HARNESS ASSEMBLY MUST BE REPLACED AND THE ENGINE IDLE SPEEDS MUST BE RESET.
IT HAS BEEN DETERMINED THAT THE 1990 JEEP VEHICLE, EQUIPPED WITH THE 2.5L ENGINE, MAY BE IN VIOLATION OF FEDERAL EMISSIONS STANDARDS.
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HYDROCARBON, CARBON MONOXIDE AND OXIDES OF NITROGEN LEVELS COULD BE ABOVE ALLOWABLE LIMITS, WHICH WERE ESTABLISHED TO PROTECT THE PUBLIC HEALTH FROM THE DANGERS OF AIR POLLUTION. TO CORRECT THIS PROBLEM, DEALERS WILL REPLACE THE OXYGEN SENSOR. *TW
HYDROCARBON AND CARBON MONOXIDE EMISSIONS LEVLS FOR THE ABOVE LISTED MODEL VEHICLES MAY EXCEED THE LIMITS ALLOWED BY CALIFORNIA EMISSIONS STANDARDS.
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TO CORRECT THE CONDITION, THE PCV HARNESS, CHOKE VACUUM DIAPHRAGM, EGR VALVE AND DECEL VALVE, IF EQUIPPED, MUST BE REPLACED. *TW
Other
3 bulletinsSUBJECT REGARDING WIRE SPLICE REPAIRS.
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*SB
THIS BULLETIN PROVIDES A REVISED WIRE SPLICE PROCEDURE AND RELATED PARTS.
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*TT
UNKNOWN
Body & Paint
2 bulletinsDIFFICULT TO CLEAN LIGHT COLORED "CHALKY" RESIDUE FROM PLASTIC BODY COMPONENTS THAT ARE MOLDED IN BLACK.
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*TW
DIPAP Requirements - Addition of Jeep Wrangler (JL/JK) and Jeep Gladiator (JT) Hard Top and Targa Top Panel Replacements - All Dealers (Rev.
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A)
Infotainment
1 bulletinINFORMATION ON INSTALLATION OF RADIO TRANSMITTING EQUIPMENT.
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*AK
Electrical
1 bulletinRECALL 558 - FAILURE OF THE OXYGEN SENSOR AND CATALYTIC CONVERTER MAY CAUSE A VEHICLE TO BE IN VIOLATION OF CALIFORNIA EMISSIONS STANDARDS.
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TO CORRECT THIS CONDITION, THE OXYGEN SENSOR AND CATALYTIC CONVERTER MUST BE REPLACED WITH IMPROVED DESIGN PARTS. *TW