I have a 2001 aurora with a 3.5 that i just put new injectors ,sparkplug ,sparkplug boots and a new crankshaft sensor in.Now it wont start. It ran for a second and now it wont. It turns over well has lots of spark. we can not do the relearn procedure because it wont run.Fuel pressure is over 40 pounds any ideas do i have to take it to my dealer now
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If there is a relearn procedure, it has to be done with a scan tool from a shop or dealership. In most cases, the crank sensor has no relearn procedure on GM/OLDs products. Instrall a new sensor and the PCM will recognize it and start the engine
Run a compression test to verify the condition of the valves and rings. Then check the electrical connections on the injectors. Add some injector cleaner in the gas tank . Service the mass air flow meter.
This would mean the #3 cylinder and the #6 cylinder are misfiring. There are several potential reasons including bad coil-paks or sparkplug wiring, coils on plugs(new style), crankshaft sensors, or shorting fuel injectors.
Some problems may be visually seen if the engine compartment is open in a dark place and sparks jump. Or the sparkplugs on the cylinders mentioned could be bad.
It could be the Ignition Switch. If, when it cuts off, you notice your gages, etc go off, then you are losing ignition power. If not, then maybe I would look at the crankshaft position sensor, etc. This should through some sort of code though.
1) If you have any engine codes, these may be a clue.
2) Check air supply, clean filter, not blocked?
3) Check fuel pressure.
4) Crankshaft position sensor, but this will throw a code, so you should have seen this from step 1.
5) Spark plugs & ignition modules - should also throw codes.
6) Fuel injectors
Start with the replacement of the Crankshaft position sensor to address the P0336.
The faulty crankshaft position sensor may be causing the P0201 which is a fuel injector failure to injector #1 and the P0203 which is a injector failure to the injector #3. The failure to the injector will cause the P0300 DTC code which is a code for multiple misfire.
The crankshaft sensor sends signals to the ECM which then would command the injector to pules open and close and the duration of time. If the ECM does not get the right readings, then it's not going to know when to command the injectors to activate.
Start with the Crankshaft sensor (CKP)and then check the injector wires and injectors it self after the (CKP) has been replaced if problem still persists. Good luck and keep me posted, be glad to help you get your car running 100% again soon.