Backfiring and black smoke - 454 91 Carb 4BL

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Backfiring and black smoke - 454 91 Carb 4BL

Home > Discussion Forum > Mechanic's Corner - Engines

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All Messages in Thread	Author	Date
Backfiring and black smoke - 454 91 Carb 4BL	Jon G.	9-30-06
My 1991 Rexhall-Airex on Chev P30 chasis with 454 4-barrell carb. Has started giving black smoke on acceleration, and some backfiring when let off accel at in-town speeds. Cold running is fine. Ideas, thoughts? Jon (Mission Viejo, CA)
Re: Backfiring and black smoke - 454 91 Carb 4BL	mike e	10-1-06
If it is a 91,454 it may be TBI fuel injection. If so check the coolant temp. sensor and check the thermostat,see if the temp gauge goes up around 190 degrees.A cool engine or a low signal to the ECM will cause it to run rich after about 3 min.This may cause black smoke and loading up with to much fuel. Good Luck MIKE