1991 Buick Park Avenue smoking

KISHA219

MEMBER
1991 BUICK PARK AVENUE

IT blows black smoke while driving I was told it can be the egr but I dont know please tell me how to fix this losing a lot of gas. It still runs just a lot of smoke coming from the tilepipe. Its like the gas not making it to where it supposed to. Have anybody every had this problem and if so how do u fix it. Also im trying to figure out why my horn don't work

1 Reply

FREEMBA

MECHANIC
1,152 POSTS

First of all it is not the EGR valve (so there is no reason to change that).
Black smoke means that the engine isn't burning all of the gas that enters the cylinder (either because of ignition system problems, compression problems or too much fuel[or not enough air] is entering the cylinder).

This car has a Mass Air Flow Sensor (they were frequently the cause of symptoms like yours). The sensor is located in the intake air snorkle between the air filter and the throttle body. It is flat and attaches to the side of the air snorkle and has a three wire connector running to it.

With the engine idling, at normal operating temperature, tap on the sensor with something like the handle of a screwdriver. If the engine dies, the sensor is bad.

Please let me know the results of your test.

Thanks.