What model year engines interchange with 1991 GMC 5.7l

SOURCE: 1991 GMC TBI 350 sierra stalls bad

Could be the TPI Sensor or it might be a touch out of timing.

SOURCE: 7 wire harness going to blower motor resistor

There is an updated resistor/connector package. Very expensive from GM, try your local NAPA or other parts supplier for a replacement

SOURCE: 1991 GMC Sierra loses fuel pressure after it reaches the TBI

THE INJECTORS ARE PULSED TO GROUND DIRECTLY BY THE ECM...... MAIN COMPUTER... IT COULD BE FLAKY BUT I HAVE FOUND MANY TIMES THAT THE HALL EFFECT SENSOR LOCATED IN THE TOP OF THE DISTRIBITOR GETS INTERMITTANT.... THIS CAUSES LOSS OF SIGNAL TO ECM INTURN LOSS OF SIGNAL OUT OF ECM TO INJECTORS... LET ME KNOW

SOURCE: 2004 gmc sierra 1500 blower motor location

The blower motor is on the passengers side under the dash.You might have to remove the a lower panel.This is the insulator panel.If the blower works at all just turn it on and follow the noise.Hope this helps.Good luck.

Michael Schaffter

• 57 Answers
• Posted on Sep 17, 2010

SOURCE: 1991 gmc 1500 blower motor doesnt work

I had to change the blower motor, turns out the spring tension on the brushes on the motor were too tight and ate into the brass commutator of my old motor.