AboutSean Halliday Expertise general auto repair,japanese,bmw,mercedes,mini cooper 1960/2009,general british cars,ford.I DO NOT work on automatic transmissions.Manual transissions i install clutches only.Many people ask me to diagnose noises from their cars,unfortunately i cannot do this unless i hear it.As you appreciate,vehicles can and will make a variety of noises.I DONT UPGRADE or fit aftermarket performace kits,parts,chips,only replacement parts.
Experience 40 years experience on all general auto repair.
Question 1997 gmc sierra truck runs fine but recently if it sits for a couple days it takes a lot of cranking then it runs rough for a couple of minutes and then it smooths out this started out of the blue the first time it sat for about 3 days that time it took about 5 minutes of cranking no signs of external leaks
Answer Could be a sign of the fuel pump on its way out.Change the fuel filter and have the engine tuned up,basic things such as plugs ,filters,cap,rotor.A good way to test the fuel pump is switch the key on and off 4 times,listen to the fuel pump hum for about 3 seconds , but do not crank until the 4th time that way you can build up fuel pressure using the initial start up injector.
