Is it timing or something else

Asked by Aug 05, 2016 at 12:34 AM about the 2003 GMC Sierra 1500 Work Truck Standard Cab LB

Question type: Maintenance & Repair

Hi i change my oil and filter, my fuel pump and fuel filter, i also change my rotor distributor cab
wires and spark plugs  on a gmc sierra v6 4.3l yr 2003. Now my truck shakes a lil and when i
step on the gas pedal it feels like shocking. Plus when connecting timing gun i dont get flash
from it. Can any body help me out

8 Answers

83,175

Recheck your work, its really easy to fracture a spark plug and not know it, or possibly one of them is bad. A scope check would most likely find what one is laying down under power if you wanted to take it to a shop and have it done.

5,005

Check ur spark plug wires to make sure u have the right firing order

I did already i even put the old spark plugs and wire to see if that was the problem i double check the gap and they are fine and on the firing order i have the speks of it. I dont know what wlse to do

5,005

If the timing is right, sparkplugs and wiring then chec to see if U might've accidentally disconnected a sensor plug or vacuum hose

I did check all that and i have spark on cilynder 1 i made my timing gun work allready but now everytime i step into gas pedal check engine light flashes but truck doest shake no more. All this is on a park mode i havent switch gear on it

83,175

OK now you have a code stored in the system, hopefully this is your problem, so get the code pulled. Do you have a code reader?

I did check all that and i have spark on cilynder 1 i made my timing gun work allready but now everytime i step into gas pedal check engine light flashes but truck doest shake no more. All this is on a park mode i havent switch gear on it

I think i found the issue my cousing tied the distributor cab to hard and the screw from the inside was loose. Thanx cousin for adding more bills lol

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