GMC Troubleshooting Questions? Ask a Mechanic for Answers
is the abs light still on? does your scan tool have abs functions?
so the abs light Is off now?
ok are the brakes acting normal?
is the battery dead?
is the theft or security light on?
it would look like a padlock on the instrument panel
We will have to pinpoint what the engine is missing.
All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the car to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should! Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition.
sound like a coincidence should have had no effect
well we need to determine what its missing to start...fire fuel or air.. cleaned a wheel speed sensor ground will not effect engine driveability
at the wheel speed sensor? can you attach a image? can you hear the fuel pump engage?
a buzz for the first 3 seconds when the key is turned on usually its best to have a second person...have them put there ear to the gas fill nozzle and listen
that's ok but can you hear the pump energize?
that's odd no 3 second buzz/hum
I would check and verify the fuel pump fuse...next I would check fuel pressure ..sounds like kit may have failed
should be in the under hood fuse box, the lid of the box will label them
what model and motor size
all I know is 2006 gmc small v8 what model gmc ?
did that help?