Recently got a 03 chevy 1500 with a 5.3L that had been sitting for a couple years. Truck runs rough and knocks for the first few seconds when cranking . Then it has severe lack of power and rough idle. Showing a p0336, p1516, and p0102 code. I've pumped old fuel out and put some ethanol free has in. Replaced fuel filter. When pulling plug wires off 1 at a time with vehicle running. Number 1 cylinder and number 7 cylinder didn't change anything. I swapped #1 and #3 cylinder coils,wires,and plugs and i still don't have spark on cylinder 1. I can attach coil plug wire on 3 to plug 1 and get good fire. I tested the plug for coilpack and got power and ground. But I can't get signal on either of the 2 other wires. Even tested cylinder 3 coil plug and had issues with it also. With vehicle running. I can get a very weak and random spark coming from coil pack to plug wire

 

Until you fix the cause of the P0336 Diagnostic Trouble Code (DTC), your engine is not going to run right regardless of your perceived misfires on cylinders 1 and 6.

The P0336 is telling you that there is a problem with the crankshaft position sensor circuit. NOTE - it is not telling you that you have a bad crankshaft position sensor. It is telling you that there is a problem and you must determine/diagnose why there is a problem with that circuit. It could be a faulty wiring connector, an unplugged connector, a broken wire, corroded or dirty contacts at the crankshaft sensor, or it could even be a defective sensor.

Read this for information on how to test the Crankshaft Position Sensor:

https://troubleshootmyvehicle.com/gm...crank-sensor-1

Now the P0102 DTC is telling you that there is a problem with the MAF sensor circuit. Again, it is not telling you you have a bad MAF Sensor. Read this for information on how to test the MAF Sensor:

https://easyautodiagnostics.com/gm/4...e-maf-sensor-1

Finally, the P1516 DTC is telling you that you have a problem with the Throttle Actuator Control System, and you have to figure out what is wrong.

Now, there is one connection between all three of these DTCs. They appear to be electrically related - meaning, since the truck sat for an extended period of time, all the electrical connections to the various sensors, modules, ignition coils, fuel injectors, etc. could have become dirty, corroded or oxidized and you must go through and visually inspect them all. If the contacts inside the connectors/device are dirty, then they need to be cleaned using CRC QD Electronic Cleaner. Here is a link
https://www.autozone.com/miscellaneo...1oz/128435_0_0

Now, because you did not state the presence of the P031 and P0306 DTC codes (misfire detected codes for cylinder 1 and 6), I am not going to address them.

So, like I said earlier, fix the cause of the P0336 DTC by diagnosing the problem (which could say you many dollars rather than just replacing a part which may not be bad) first, then take care of the other 2 DTCs, and re-evaluate the engine and include ALL current, pending and historical DTCs.

Good Luck and remember, Diagnose, Diagnose, Diagnose.

 

Thank you very much. I will further diagnose it next weekend when I'm off work. I just wasn't sure if they was all related or not and I don't want to throw money and or parts at the truck until I absolutely have to.

 

Good Luck!

 

I was too concerned about what it could be.Now that I have your info, I'm planning to investigate before allowing some mechanic to rip me off.




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