Crank no start, codes p0014 and p0366

2006 CHEVROLET TRAILBLAZER
275,000 MILES • 4.2L • V6 • 4WD • AUTOMATIC
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AH8007
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Driving down the road and the vehicle started to lose power. Eventually it cut off. Towed it home.
Sometimes when you try to start it it does start but immediately cuts off. But most of time it won't start at all.
Check for spark. Which I was getting but seemed weak and inconsistent
Sprayed starting fluid in intake still wouldn't start.
Replaced camshaft, crankshaft sensor and still would not start.
Has codes p0014 and p0366.
What code be issue?
Mar 1, 2020 at 12:25 PM
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ASEMASTER6371
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Good afternoon,

I would start by checking the compression to see if you have a timing issue with the chain.

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

This sounds like a crank sensor as it is related to both codes and would explain the little or no spark issue.

Roy
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Mar 1, 2020 at 3:04 PM
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AH8007
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I've checked compression. Got good readings. 160 each cylinders.
Mar 1, 2020 at 5:42 PM
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AH8007
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I replaced the crank sensor and it still wouldn't start after replacing.
Mar 1, 2020 at 5:43 PM
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ASEMASTER6371
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Does the tachometer go up a little while cranking?

Did you check the fuel pressure? Try spraying some carburetor cleaner in the air filter and see if it starts and stalls.

Roy
Mar 1, 2020 at 6:00 PM
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AH8007
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Fuel pressure seems good. Read 60 psi when key is turned to on position. Dose drop do to about 50 psi after 10 minutes. When cranking the engine it bounces around 50 through 60 psi. Sprayed starting fluid in throttle doesn't do anything. Tachometer doesn't move while cranking.Getting codes p0135 and p0141 now.
Mar 2, 2020 at 5:42 AM
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AH8007
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Keep in mind. The truck does act like it wants to start. And when it does it shuts off immediately. Also the instrument gauges start going crazy and lights start flickering.
Mar 2, 2020 at 5:53 AM
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ASEMASTER6371
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Can you check for spark when it is cranking?

It could be a crank sensor.

The pressure should not bounce at all. It needs to be constant.

I would also check the compression. You need to be sure the chain timing is correct.

Roy
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Mar 2, 2020 at 5:58 AM
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AH8007
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Compression reading was like 180 psi.there is spark when cranking. And I already changed the crank sensor.
Mar 2, 2020 at 6:41 AM
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ASEMASTER6371
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Okay, back to the fuel pump. It should never bounce around.

What was the pressure while cranking?

Roy
Mar 2, 2020 at 6:43 AM
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AH8007
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Uploaded a video. Makes things easier.
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Mar 2, 2020 at 7:42 AM
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ASEMASTER6371
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Good, thank you.

I am concerned about the fuel pump. It should not bounce like that.

Can you see if there is actual fuel in the rail? I am concerned you may have pressure but no volume.

Roy
Mar 2, 2020 at 8:09 AM
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AH8007
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How do I check if fuel is in the rail?
Mar 2, 2020 at 8:30 AM
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ASEMASTER6371
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You would need to bleed down the system to 0. Then remove the core in the rail adapter for the gauge. It is the same as a tire valve. then hook up a hose to the connection and run it to a bucket.

Then turn on the key and check the fuel flow out of the rail.

Roy
Mar 2, 2020 at 8:40 AM
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AH8007
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It seems to be fuel in the rail.
Mar 2, 2020 at 5:16 PM
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ASEMASTER6371
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Is there a good flow?
Mar 2, 2020 at 6:02 PM
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AH8007
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I messed up on my diag. The vehicle isn't getting spark.
Mar 3, 2020 at 9:21 AM
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ASEMASTER6371
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Okay, when you crank it, does the tachometer move up a little? That will tell me if the crank sensor is working.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

I attached a wiring diagram as well. Check the coils at the red wire for power. It is controlled by the fuse listed.

Roy
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Mar 3, 2020 at 9:46 AM
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AH8007
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I hooked a expensive computer to it. The computer is recognizing the crank sensor. It has rpm's.
Mar 3, 2020 at 10:47 AM
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ASEMASTER6371
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Okay, what about the voltage to the coils? Did you verify the voltage to them?

Roy
Mar 3, 2020 at 11:23 AM
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AH8007
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No. I do not know, I'm just lost at this point. It does spark sometimes but it is very weak when it does.
Mar 3, 2020 at 11:41 AM
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ASEMASTER6371
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You need to do some voltage checks starting with voltage at the coils.

Roy
Mar 3, 2020 at 12:38 PM
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AH8007
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Getting 12.12 volts at coils.
Mar 3, 2020 at 2:53 PM
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ASEMASTER6371
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Your battery is low. You should charge it to 12.6 volts.

Again about the fuel, did you have a good flow from the rail?

We are getting closer to the ECM.

Roy

Mar 3, 2020 at 4:25 PM
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AH8007
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Yes. Had good fuel flow at the rail. 12.12 volts is higher than 12.6.
Mar 3, 2020 at 4:48 PM
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ASEMASTER6371
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No, it is not. 12.12 is much lower than 12.6 volts.

Roy
Mar 3, 2020 at 4:52 PM
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AH8007
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Yeah, you're right now that I think about it. 12.12 is less than 12.60.
Mar 3, 2020 at 5:04 PM
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AH8007
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I had good flow at the rail.
Mar 3, 2020 at 5:19 PM
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ASEMASTER6371
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I saw that. To check the coils, you need a scope to see if the coils are being commanded by the ECM. From past experience, it sounds like the ECM is the issue.

Roy
Mar 3, 2020 at 5:26 PM
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AH8007
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You think I should throw the cam shaft and crank shaft position sensors at it out of desperation.
Mar 3, 2020 at 5:53 PM
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ASEMASTER6371
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There are no codes for them, so no.

If either was an issue it would set a fault code.

You are going to need some extra help to track why it has no spark.

Do you have a local shop that can at least do a diagnostic?

Roy
Mar 3, 2020 at 6:10 PM
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AH8007
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Yeah. I do.
Mar 3, 2020 at 7:05 PM
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AH8007
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I bought an ECM when the truck first stalled out. I kinda assumed it's the computer. Truck was running beautifully before it did this.
I'm thinking about just installing the junkyard ECM and paying someone to program it.
Mar 3, 2020 at 7:27 PM
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ASEMASTER6371
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Try it and see. It depends on what it came out of to see if it will run.

Roy
Mar 3, 2020 at 8:06 PM