Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Muffler: Technical Service Bulletins
Muffler - Unnecessary Replacement
Article No. 83-11-11
EXHAUST - MUFFLER - POWER LOW - UNNECESSARY MUFFLER REPLACEMENT
LIGHT TRUCKS 1982 AND LATER LIGHT TRUCKS
Mufflers are being replaced on leaded fuel vehicles in an effort to resolve concerns of "lack of power" or poor performance", apparently in the belief that
a plugged muffler is the cause. Although plugging with lead deposits was possible on certain models prior to the 1982 Model Year, muffler
modifications incorporated on 1982 and later models make this an unlikely cause of the concern. Thus, replacing mufflers on the newer model vehicles
normally will not satisfy the customer. Prior to replacing any muffler believed to be restricted, a vacuum check as described in Section 26-01 of the Light
Truck Shop Manual should be performed.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY"