Excessive Exhaust Emissions (Odors)

Fig. 1 Service Parts Application Chart:

*** THIS PROCEDURE HAS BEEN UPDATED BY TSB # 86-149, dated 9/86

Some 1986-88 4.3L engines may have an exhaust odor described as a rotten egg smell or sulfur smell after towing a trailer or returning to idle following sustained highway driving.

Figure 1 list's the appropriate service parts to fix the problem.