Autocar is recalling 4,100 model year 2008-2014 ACX, WX, and WXLL vehicles manufactured July 30, 2007, through Feb.10, 2014, and equipped with certain Cummins Westport Model ISL G or ISX12 G engines, which are powered by natural gas..

Condensation in the intake manifold may freeze during cold weather conditions and interfere with the proper operation of the intake manifold pressure sensor, according to the National Highway Traffic Safety Administration. The improper operation of the sensor could induce elevated exhaust temperatures or flames from the exhaust pipe, increasing the risk of a vehicle fire or burn injury to a person near the exhaust pipe.

Autocar's number for this recall is A-1402.

The recall also extends to a handful of Autocar 2014 Xpert trucks manufactured Nov. 7, 2013, through Jan. 13, 2014 and 2010-2014 Auto Xspotter vehicles manufactured Nov. 23, 2009, through Oct. 21, 2013, all equipped with Cummins Westport Model ISL G and ISX12 G engines.

Autocar’s number for the Xpert trucks is M-1404. For the Xspotter it is T-1403.

This is the same problem that led to a recall of other trucks from the makers Daimler and Paccar that were equipped with the same model engines.

Cummins and Cummins Westport will notify owners, and authorized Cummins service facilities will upload a new electronic control module calibration, free of charge. The recall is expected to begin May 1.

Owners may contact Autocar at 1-765-489-5499 or Cummins Inc. at 1-800-343-7357.