Q: my yukon will not start unless i prime it

asked by on November 12, 2016

I have replaced the throttle position sensor the mass air flow sensor. It runs good unless i let it set for a couple hours then i have to prime it again. Any ideas

My car has 157000 miles.
My car has an automatic transmission.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I flash the high beams?
You can briefly flash the high beams if you need to get someone’s attention. To do this, pull the turn signal lever (which protrudes from the left side of the steering wheel) towards you briefly, and then release it.
Car making clicking noise
Hello, a noise under the hood is usually associated with something on the belt drive system. It could be one of the bearings starting to fail or the belt is noisy or coming apart. You should get this diagnosed so...
Digital dashboard not working
Hello! That is a common problem that unfortunately usually requires a replacement of the instrument cluster. The clusters will short out internally over time, due to faulty solder points. The solder points will usually fail due to the heat those...
Starting issue, fuel smell
A few things can cause rough starting like you have described. The usual culprits are issues with the battery (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-battery), starter (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-starter), fuel pump (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-fuel-pump), fuel filter (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-fuel-filter), or the ignition switch (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-ignition-switch). I'd recommend enlisting a qualified technician to...
Occasional difficult startup - 2011 Mitsubishi Outlander Sport
Hey there. Heat alters operating parameters and causes phenomena ranging from higher resistance in ignition circuits to vapor lock. When the car is HOT, it would be sensible to investigate the ignition system first and see if any obvious faults...
Not able to drive or reverse.
There could be broken linkage in the column/console, a broken shifter cable, a broken u-joint, or any of several other possible causes. A certified mechanic should be able to take a look at it and diagnose the problem, and if...
i need to know the key sequence to get the check engine codes
Hello. The old style of retrieving codes was indeed done by turning the key on and off again. However vehiles manufactured after 1996 are equipped with OBD-II diagnostic systems. This means the driver or technician can acess and even control...
Vacuum diagram
The vacuum diagram is in a .jpeg or .pdf format and cannot be attached to this response. Please note that the complete Factory Service Manual (FSM) for your vehicle, including the vacuum and wiring diagrams, is available on Ebay at...
Ac not blowing hard enough thru the air vents.
Hi There, It is usually very unlikely that the blower fan motor (https://www.yourmechanic.com/services/heater-blower-motor-replacement) would turn counter clockwise unless you or someone else has purposely reversed the wiring to change the polarity. You may want to also check the air vent...

Related articles

2005 Jeep Wrangler vs. 2005 Chevrolet Blazer: Which One Should I Buy?
Sport SUVs are a class all of their own; these vehicles are meant for a fun drive through the woods and across the trail – but not necessarily to Grandma’s house! Think instead about going through the creek and through...
2012 Chevrolet Equinox vs. 2012 GMC Terrain: Which One Should I Buy?
The mid-size crossover SUV category offers the comfort and size of an SUV, but on the platform of a car, giving it the look and feel of a large hatchback. The unibody construction typical of passenger vehicles is used instead...
2012 GMC Acadia vs. 2012 Dodge Journey: Which One Should I Buy?
The GMC Acadia is classed as a midsize SUV, which is able to seat between six and seven passengers comfortably. The 2012 Acadia offers three rows of seating, so passengers will feel the roominess that is typical in a true...