Code p0336, Now all I get is puffing sound when cranking but start?

Hello, I'm Danny.

I've attached picture diagnostic steps below relating to code P0336 for your truck. Let us know what you find and keep us updated. Hope this helps and thanks for using 2CarPros.

Will keep you updated Danny, as of now will not start so some tests can't be done.

Good afternoon,

I would do a compression test. That will verify if you have a failed timing chain.

https://www.2carpros.com/articles/how-to-test-engine-compression

The compression should be 140-160. If they are all low, the timing chain could be the issue.

I attached a you tube video from us for the timing chain installation.

https://www.youtube.com/watch?v=mrp9YXPaYFg

Roy

ASEMASTER6371 greatly appreciate that advice.. that actually skipped my mind will keep you guys informed soon as work is resumed on truck.

You are welcome.

We are always glad to help.

Roy

Hello again.

Yes, keep us updated and let us know what you find. If you need any additional diagnostic steps or diagrams let us know we're here to help. Thanks again for using 2CarPros.

Danny-

Update: pulled all plugs (all looked like image), replaced plugs.. compression test all cylinders at 120-125 lbs still no start. still has backfiring (popping and poofing from intake and exhaust).

Compression is too low. It should be 140-160. This sounds like you need a timing chain.

https://www.2carpros.com/articles/how-a-timing-belt-works

I attached one of our youtube videos for the procedure.

https://www.youtube.com/watch?v=mrp9YXPaYFg&t=1s

Roy

Darn, okay.

Keep us updated.

roy

Definitely will.

Thank you for using 2carPros.

Roy

Okay, today I once again went while the basic steps from checking on the scanner to see that it still showed the CPK was malfunctioning or that it possibly was touching the reluctor wheel. I also checked different points of ground at the rear of the motor to the firewall and also at the front of the motor to the battery. Upon checking the spark plugs and wires I decided to test the coils 1 by 1 for each cylinder I noticed that on the driver's side the 1st 2 cylinders had no spark the 3rd cylinder had intermitted spark in the last cylinder had no spark I ran out of time before got dark so I couldn't check the passenger side but when I would place a screwdriver close to the engine block and the coil the motor seem to almost start the motor seem to almost start... Now I may be wrong but I am assuming that it could possibly be a ground issue?

Okay, I attached the location f the ground for you for the injectors. Clean the connection and make sure it is tight.

Roy

Hello again.

Just curious to know if any progress has been made. Let us know if you need any further instruction or diagrams. Keep us updated as to what you find. Thanks again for using 2CarPros.

Danny-

I've rewired the CPK, changed cpk and cam sensors, spark plugs, wires, check injectors with noid tester, grounded CPK to body. Everything but open up the motor but still no luck.

Did you check for power to the crank sensor itself?

Roy

Yes, that is when I grounded cpk to body.. I checked blue pin 21 at PCM (cpk ground) no ground.

What was the voltage?

I attached the connector diagram. The light green should have 12 volts.

Roy

12 volts.

On what color wire? The light green must have 12 volts for the sensor to work.

Roy

Yes, light green power, blue trigger yellow ground.

Can you test the voltage on the signal wire while cranking?

Roy

I'm doing everything alone no help available.

You are going to have to get someone to help you do these checks if you want to get to the root cause of failure.

See if you can get somebody to help you.

Roy

Hello again.

We haven't heard a report in awhile so we are curious to know if any progress has been made. Let us know if you need any other diagnostic steps or diagrams. Hope this helps and thanks again for using 2CarPros.

Danny-

I ordered a matching ECM will test when it arrives.. I'm trying not to take it to a shop.. with the ECM not reading negative for the CPK sensor ground I thought to try this before throwing in the towel.

Hello again.

Okay, let us know how things go after ECM replacement. There are a few relearn procedures that will need to be done after replacement. I've attached picture steps below showing how to replace the ECM and the relearn procedures. Hope this helps and thanks again for using 2CarPros.

Danny-

Like Danny stated, you need to program the replacement ECM for it to work.

Roy

Update: received and installed used PCM/ECM of the exact same part number, reconnected everything, re-inspected the wiring at the CPK and at the computer, performed relearn procedure, attempted to start with no luck. Checked the ground for CPK at the PCM and found no ground signal on the yellow wire. So I am still stuck in the same place. No spark to coils 1,2 and 4 on the drivers side.

Okay, did you have the ECM programmed to your VIN number? Even if you have the same part number it still has to be programmed to your VIN.

That can be done with a DRB 2 or equivalent advanced scan tool. Most shops have the capability to program the ECM.

Roy

Procedure

1. Setup - Ensure that the following conditions have been met:
^ The battery is fully charged.
^ The ignition is ON.
2. Program the PCM using the latest software matching the vehicle. Refer to the Techline terminal/equipment users instructions.
3. If the PCM fails to program, proceed as follows:
^ Ensure that all PCM connections are OK. Inspect the Techline terminal or equipment for the latest software version.
^ Attempt to program the PCM. If the PCM still cannot be programmed properly, replace the PCM. The replacement PCM must be programmed.
4. Perform the PCM Password Learn procedure. Refer to DTC P1631 Theft Deterrent Start Enable Signal Not Correct.
5. Perform the Idle Learn Procedure. Refer to Idle Learn Procedure.
6. Perform the CKP System Variation Learn Procedure. Refer to CKP System Variation Learn Procedure.
7. Reset the engine oil life monitor. Refer to GM Oil Life System - Resetting.
8. Perform the Functional Check.

FUNCTIONAL CHECK
1. Clear the Diagnostic Trouble Codes (DTCs).
2. Perform the powertrain On Board Diagnostic (OBD) System Check.
3. Start the engine and idle the engine for 1 minute.
4. Use the scan tool in order to inspect for DTCs.

A lot of the advice that I'm getting is dealing with a running vehicle.. my vehicle is not running and yes I have had PCM programed.. I am looking for the solution for no ground at the PCM for the CPK.

Okay, I attached the wiring diagram of the crank sensor and the connector.

Do you have 12 volts to the connector on terminal C or the light green wire?

Also, put your voltmeter leads in the connector. Red lead to C and black lead to B or the yellow-black. Tell me the voltage. It should be battery voltage with the key on.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Roy

Hello again.

Please give us an update as we haven't heard from you for awhile. Thanks again for using 2CarPros.

Danny-

No update still not running.

Did you do any of the checks we suggested?

Roy

Yes, 14v.

Okay, that is 14 on both pins? Did you put the black lead in the connector as well?

Roy

Yes I did.

There is no ground at the ECU.