I have a 2011 Sierra 1500 X-Cab 5.3L Z71 after purchasing I put a Flowmaster 70, and a K&N aircharger (model #63-3070). After installing both (virtually at same time) there is a distinct hesitation when I start the truck. I checked connection for K&N and believe there is no air leaks...but I'm not sure. Gas mileage isn't terrible but not great (16-17 mpg combined city/highway). No error codes detected. Any suggestions?
May be a problem with the mass air flow (MAF) sensor - I would check the readings from it to make sure it is working properly. It is very sensitive to fouling which can cause this problem.
SOURCE: 01 gmc truck 1500 2wd oder of antifreeze inside cab
the small radiator just inside the cab, where the hoses go to the heater is leaking. You may try using stop leak (many don't recommend this) or take off the heater radiator. it will probably get worse when you turn on the heater and fog up the windshield if not fixed. hope this helps.
SOURCE: 1994 GMC 5.7 L Hesitation Problems
the problem is most likely the EGR Valve. to test this disconnect the vacuum line to the EGR Valve and block it with a screw or golf tee, if the hesitation goes away replace the EGR Valve.
SOURCE: Lack of power when accelerating
You really should have a code check done. There are numerous items that can give you similar symptoms. Two places to look are the fuel filter (usually overlooked till they gum up, and the throttle position sensor (but test it first with an ohmeter. You will need a manual (vehicle specific ones are available at most larger parts stores and most of those stores also do code testing free)
SOURCE: 2003 GMC Sierra died while driving down the highway
hi, the problem you are having sounds like an imobilser problem does your key have a fob that unlocks the doors etc check this is working if it is then the problem could be with the key itself as they are programmed so that if somebody used a different key in the ignition it wouldnt allow the car to start.
The only way of knowing for sure is by taking it to a main dealer because the imobilser problems wont show up on a diagnostics machine the main dealer will be able to test the key or fob for you they should test it for free but if it needs replacing then you will have to pay for this unless its a common fault if it is common problem with that make and model they will replace this for free.
im sorry their is no easy fix for this problem but it is more than likely your imobiliser if it was say something like starter motor your car wouldnt have cut off whilst running so it points to an imobiliser problem so get this checked.
Let me know how you get on or if you require further assistance ok
SOURCE: 1996 1500 Silverado V6 4.3 gas mileage.
for better freeway mileage a low back pressure exhaust will help, also run tires at max pressure, this is around 45 PSI, in town there is little you can do.
Testimonial: "Thanks for the advice, I didn't know about the low back pressure exhaust system, I'll try it out."
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