Engine start but no runs also no error codes ,the first thing i did i put mechanical gauge at fuel rail and i think my presure its ok about 45 psi. my next step check for electrical problem i got not spark at coil to distrubitor but i got 12 volts a soon i turn the key on for about 2 second and then i got 0 volts,its normal?....my question its maybe my problem its cranck shaft speed sensor?
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The check engine light is because all check engine light codes are caused by components that affect emissions. It's not actually an engine problem, it's a problem with either your O2 sensor, MAF sensor, fuel/air ratio, pyrometer, or exhaust. ______________ gm diagnostic tools
when you state it wouldn't crank, do you mean the starter won't engage or that it just spins over and doesn't start? if no gauges or no starter engagement, then check the battery, battery connections,and the starter for excessive amperage draw. if the starter spins and the engine won't start, then check crankshaft position sensor first. the crank sensor is a more common failure than the distributor or any of the other things you mentioned.
The first thing i would check is the fuel system hook a fuel pressure gauge up to the fuel rail and check the fuel pressure, after you have verified the fuel pressure is good let the gauge sit and monitor how much "bleed down" occurs if the bleed down is out of spec i would bet the fuel pressure regulator is bad or theres a leaking fuel injector causing fuel to drip into 1 or more of the cylinders causing a rich condition at startup.
the reg is most likely on the fuel rail. perform a pressure test with a fuel pressure gauge. attatch the gauge to the test point on the rail(looks like a vavle stem on the wheel), start engine and measure pressure. you must get the specs for pressure for your vehicle.typicly between 30 and 50 shut the vehicle off and leave the gauge attached. the pressure should hold. is the check engine light on?
you need to have it connected to an OBD2 machine and watch if you are missing the cam sensor showing RPMs or if your missing crank sensors RPMs, it could be a wiring problem or computer if your seeing the RPMs from both sensors,and the last thing i would check is hooking up a fuel gauge to the reed valve and watch what fuel pressure you have while cranking,if the cam sensor is the culprit it will turn the fuel off after the cranking.
Did you try changing the air breather for the motor?You need three things inorder for the engine to run well. Air,fuel,and spark.since you had a tune up and fuel flushed.I can only think of two things.First I never heard of flushing a fuel filter,you change it ( not flush it ) change your fuel filter,eliminate the guess work.And change your breather.
hi ,here is a list of sugestions,check for spark at the spark plug wires ,check fuel presure,try spayng a little starting fluid by the air cleaner if it starts or try to start you may have a bad fuel pump,if is not spark ,check for a bad ignition module.Good Luck
CHECK INJECTOR LEAK DOWN. INSTALL FUEL PRESSURE GAUGE, PRESSURIZE FUEL SYSTEM BY LETTING ENGINE RUN FOR A MINUTE, SHUT ENGINE DOWN, AND OBSERVE FUEL PRESSURE. IT SHOULD NOT DROP BY MORE THAN 15-20 PSI IN A HALF HOUR. IF IT DOES PRESSURIZE FUEL RAIL AGAIN AND REMOVE FUEL RAIL WITH INJECTORS STILL ATTACHED AND LOOK FOR FUEL DRIPPING OUT OF INJECTORS. IF FUEL IS DRIPPING REPLACE INJECTORS AND SEALS.