Question about GMC Yukon XL

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Truck stop running after running for a while. Stop let truck rest a little start right back up and runs for a little while then repeat the same process over and over with in dash screen says service brake booster

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In relation to the brake booster, try looking at the vacuum hose that runs from the inlet manifold to the brake booster. It could have become hard and brittle and split causing a bad air/vacuum leak.
Sometimes in older vehicles the rubber diaphragm inside the brake booster can perish and split allowing excessive air through the booster into the inlet manifold

Posted on Aug 19, 2010

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Posted on Jan 02, 2017

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Truck runs fine then dies while driving then will start back up and run ok.


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After replacing i cranked the truck and the steering wheel took off very fast turning by its self from left to right back andforth until i turned the truck off . what is wrong.


Did you bleed the air out of the system? Try that first. Just turn the wheel from left stop to right stop a few times with the engine running.. Then check fluid level and add as necessary. Repeat turning the wheel a few more times until the air is out of the system

Mar 04, 2015 | Cars & Trucks

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Ford F150 only blows heat when truck is driving


May a a vacuum or electrical problem that actuates the blend door.

Jan 06, 2014 | 2002 Ford F150 Regular Cab

1 Answer

My truck began running very rich little by little.


FROM WHAT I FOUND OUT ON MY SAME TRK ONLY 94' IS THE DIAPHRAM ON THE FUEL PRESSURE REGUALTOR IS SLUGGISH OR BLOWN. DISCONNECTING THE VACCUM LINE AND PLUGGING THE MANIFORD PORT HAS HELPED UNTIL I AM ABLE TO AFFORD THE REGULATOR. TO HELP CLEAN THE OXY SENSOR, SPEED UP THE IDLE AND DISSCONNECT THE BRAKE BOOSTER VACCUM LINE AT THE ENGINE. THE FRESH AIR WILL SOMEWHAT HELP CLEAN THE SENSOR IF IT IS ABLE TO BE HELPED. I AM TOLD THAT THE OXY SENSOR ON THESE MODELS IS CRIDICAL. JACK

May 13, 2010 | 1986 Nissan Pickup 4WD 1986

1 Answer

My truck wont start when it is cold, i checked the fuel pressure and it reads 52 lbs. When the truck is warm it will start everytime. Oil pressure gauge is reading low, but the dipstick reads full.


When are you taking the fuel pressure reading? After it has sat for awhile or right after you shut the truck off when you get it running? Have you tested the pressure right before you try to start it cold?

I would check the pressure right after shutting the truck off, then wait an hour and check it, and once again after another hour. If you lose fuel pressure then you either have a bad fuel pressure regulator or you have a loose fitting / cracked line or some problem that allows air in the fuel line causing the fuel to syphon back to the fuel tank.

The next time you try and start it cold, turn the key to the on position and listen for the fuel pump whine to stop, then turn the key off and repeat above step 2 or 3 more times. If it is losing pressure, then doing that will build your fuel pressure back up and it will start.

Check the pressures and report back your findings.

Dec 02, 2009 | 1999 Chevrolet K2500

1 Answer

When the engine is started in the morning it doesn't run right


It starts and will run perfect or will not start at all

Oct 25, 2009 | 2001 Dodge Ram 2500 Truck

1 Answer

The truck runs fine. I come to a stop light, and


Fuel Filter-clogged. Fuel Pump binding mechaniclly or low volume. Are you sure you have no stored codes and do you really know from a very technical description what diagnostic work was done by your guy? Is it under warranty, I assume not ,if you r Dealer wasn't involved

Sep 28, 2009 | 2006 Ford Ranger

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