Question about 1991 GMC Sierra

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Locatin of the vacume hose on a 1991 gmc sierra 5L

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There should be a picture on the top of the radiator showing the diafram

Posted on May 05, 2010

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1 Answer

1991 4 x4 gmc sierra 1500 rear wheel seized


if both wheels are not turning look into the diff. but if only one tire is seized check for a brake problem.

Nov 03, 2013 | 1991 GMC Sierra

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Loosing power when mashing gas pedal


check fuel pressure and vacum lines for leaks. kinda need more info.hope this helps.

Oct 17, 2013 | 1991 GMC Sierra

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How do you replace the brake booster on a 91 gmc its a jb6 vacume system i dont see any bolts to take the booster off


stick your head way up under the dashboard with a good flashlight. you will see a shaft operated by the brake pedal. follow that shaft to the firewall, all will be revealed.

Feb 07, 2011 | 1991 GMC Sierra

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I have a 1991 GMC Sierra 1500 with a 5L V-8. The transmission is nit shifting into 3rd gear from second properly. Also the rpms are high from 50 km/h to 90 km/h when 4th gear engages. When scaned the code...


My truck had a shift problem from2nd to 3rd. I was ready to buy a solenoid package for it. ( which is what you have to buy, you can't get the solenoids by themselves, several hundred dollars) Someone recommended tranX to me. I put it in and within three days the transmission quit slipping, it's been over two years now and it hasn't missed a lick. It was a ten dollar fix, compared to $300.00 that the package was going to cost. not including any labor to install

Nov 28, 2010 | 1997 GMC Sierra

1 Answer

1998 GMC K1500 Sierra X-Cab Z71, Concerning the A/C - Heater. The fan blows good just doesn't open the heater core valve to let the heat in, it stays cold,How can I fix it ?


the heater sustem is run off of a vacum from the engine, there are actuators that open and close the "valves" pull the vacume lines off one at a time( the coloured hoses) and find out if you have either no vacum or an actuator un hinged from the "valve" door.
this should narrow it down for you message me back and we can work it out.

Dec 06, 2009 | 1998 GMC Sierra

1 Answer

1991 GMC Sierra revs high and bogs out when


idle my be offset or a hose my be off as well

Oct 14, 2009 | 1991 GMC Sierra

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2003 GMC Sierra Brake PROBLEMS!


Try vacum bleeding with a vacum pump from any parts store. You definitely have air somewhere and vacum bleeding usually works and you can do it by yourself.

Jul 07, 2009 | 2003 GMC Sierra

2 Answers

Transmission is slipping


No vac line, Pressure is controlled from the TV cable attached to the throttle body. Is it still hooked.

Mar 26, 2009 | 1991 GMC Sierra

4 Answers

1991 GMC TBI 350 sierra stalls bad


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

May 30, 2008 | 1991 GMC K2500

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