HT4100 4.1, 4.5, 4.9 Discussion, need some help with my 1994 Deville 4.9L v8 in Cadillac Engine Technical Discussion; Car sputters when i push on the gas pedal and shuts off. It turns right back on when i turn ...
Car sputters when i push on the gas pedal and shuts off. It turns right back on when i turn the key. Only happens sometimes. Has been starting to get worse over the course of a month. Changed the plugs about a month ago, gas is at good level. (When it turns off the gas gauge goes low, and goes up to its level after that.) What could it be?
(Also the car backfired on me on way to work when i pressed the gas at 53mph.??)
Last owner used regular unleaded gasoline. I've been using plus instead of supreme. It was working good... owner since January 2011. 85,3## on odometer
Automobile(s): 1985 Coupe Deville 4.1 & 1970 Eldorado 8.2
Re: need some help with my 1994 Cadillac Deville 4.9L v8
Check the Fuel Pressure Regulator. Make sure that it is giving the correct pressures. Also remove the vacuum hose from the regulator and check for the presence of fuel. There should be none in the vacuum hose. If there is, Then the Fuel Pressure Regulator Diaphragm has failed.