I have a 1999 gmc sierra with (as of 30 days ago cat. converter, fuel pump and filter, cap and rotor) changed in garage. regular oil changes, tune ups as of 8 mths. it has lots of cranking power, but won't start. Turns over great but still won't start. 153,000kms, 5 speed overall i do not abuse, owned it since 2001. It did sit for 2 winters.

Check TPS sensor[RPM]

Is the vehicle running rougher since the tune up and such ? Is it worse since fuel filter change ? Was there any change good or bad since the work was done ? Is the fuel line leaking gas ? Do you remeber what code AutoZone came up with ? I'm just trying to get all the correct information so I can give you the best guess as far as what your problem could be. Also what size engine do you have ? Reply/comment here or you can email me directly at [email protected]. I don't mind helping if I can and there is no cost but as I said need as much info as I can.

try a new cap and rotor arm if still no joy then it might be head off and check the valves as one of them could have a chip off or a seat is damaged ,could also be a hydraulic tappet if oil hasnt been changed regular ,This is another one of them type of things where i would need my hands under the bonnet to have a good look

can be a few problems but the most common is fuel filter clogging---the others are egr valve carboning up [remove and clean carbon with a strong carb cleaner ]--fuel pump check fuel pressure--pcv valve --cat converter clogging--air filter -throttle body/carb needs cleaning--or tune up these are a few

POSSIBLE TPS OR THROTTLE BODY,COULD ALSO BE FUEL FILTER OR PUMP,CHECK FUEL PRESSURE.










TIM...

catalytic convertor sounds like get under it when cool and hit it.. if it rattles it is clogging up stopping the air flow.. had a dodge ram 1500 do the exact same thing got it tuned up and new cats and never a problem again...

hello,
You have a bad oil pressure switch. I know that sounds strange but It feeds the fuel pump. Some times randomly the PCM does a self check and shuts off the fuel pump relay when it does this it runs off power from the oil pressure switch. The easiest way to confirm this as a diagnosis is to unplug the fuel pump relay when the engine is running. If it dies when you unplug it thats it. if not you will probably need a fuel pump or possibly just a cap and rotor (tune) but I belive it is the oil pressure switch.

Roy

what kind of exhaust do you got, the converter actually may help get better mileage. scan egr for errors in emmisions, get the timing checked mabe running rich, check pcv valves,test knock sensor, 02 sensor( scan might not pick up) lemme know how it goes

It could be electric fuel pump stall. The pump isn't pumping fuel fast enough. This model may have a inline fuel filter before the fuel pump as well that might need replacing.

have fuel pressure checked if ok should be approx 60psi.if ok try disconnecting mass air flow sensor connector to see if problem is eliminated. this the computer in to a default mode.the sensor is a common problem.thanks from schleck