20 Most Recent 2003 GMC Envoy Xl - Page 2 Questions & Answers

Did you put it in a ditch ? hit a big pot hole etc...

Try tapping on the Throttle Position Sensor, you may need a new one.

No your car will still turn on with a bad cam sensor. Bad crank sensor would cause a no start. What code is popping up with the check engine light?

First thing I would do is change the fuel filter.

Sounds like you may need a tune up. It could be a restricted fuel filter or old fouled out spark plugs. The possibilities are huge. Your fuel pump could be weak or you have a bad or leaking injector, but start with the simple stuff first if you haven't done a major tune up in a couple of years, start there. You could also do a fuel pressure test to be sure your system he enough pressure before you spin it over.

Do not heat or bend any suspension parts. Big no-no. If it's all touching and out of whack, check for possible bent frame. Body-shop that did the past work might have overlooked the frame being bent. All measurements start with a straight frame.Then go after the individual hitch and sway bar.

All the wires are black or black with a white stripe. These are all ground wires. In a plug. Cut the plug off. Strip the wires back. put them all in a ground lug. smash or solder them all together. reattach them to the body. Things will start working again. There is one one the passenger side and one on the drivers side.

the wiring is stationary

it's call dlc data link connector hope it helps

If the vehicle is on, but not moving, the only thing in that area that would be "in motion" and capable of causing a 'knock' is the electric fuel pump. That should be your problem. The only other possible cause would be if you have some sort of electric/computer controlled ride system which is trying to pump up and is making a knocking sound. There is nothing else in that area of the vehicle that can cause that when you are parked.