Hi there.

What's your sign?

 

That fuel pressure reading is unacceptable.

 

^
despite a new fuel pump and regulator...


OP, do you still get the CPS code after changing out the CPS? What brand did you put in?

 

If it's a 1391 code could also be the cam position sensor.

IIWM I'd be checking those 2 signals at the PCM (could also be a bad wire).

Borrow @awg 's oscilloscope.

 

Cause those 2 sensors' signals also need to be synced.

 

No apology needed, but it does give rise to some important questions...and possibly some answers

So 1st question, do you have a simple OBD2 code reader plugged in ?..how are you reding the code

You indicated a 1391 code, if this is the case, my understanding, the following may happen

Vehicle will start for 3 secs, if the computer does not get correct readings from certain critical sensors, it will shut down the ASD relay, so no FP or ignition

You will be able to tell if this is he case, take the lid off PDC and it says which relay is which, turn ignition on, ASD and FP relay will click on, place finger on ASD relay if it shuts down after 3 secs, you can feel it click, means you have a sensor issue

As @Dave51 mentioned, the cam or cranks sensor may be out of sync, I think someone had that, new cam sensor was slightly different or faulty

I would reinstall the OEM parts there, check OBD

Dave is the scope man though, he is going to recommend me what Hantek or Pico I should buy I am sure he wont mind ducking around and fixing it up for ya

 

Hey, I've said I'd loan my stuff out to anyone (they pay postage and leave massive security deposit).

I use Hantek 1008C. Couple other posters got Hantek 6022. Another poster got Abestop AT312G.

1008C has room for 8 channels but for what we use it for I can only run 3 before it locks up. 6022 has a better sampling rate. You need all the peripherals and that runs about 200 bucks.

I downloaded the phone app HScope to use with the 1008C to get a little more portability but haven't tried it out yet.

As we've touched on before, I'd take a serious look at Pico. Entry level is about $165:

https://www.picotech.com/

To add: IMO the most channels that would need to be run simultaneously for the stuff that we do here would be 2: for CKS/CPS sync and fuel injectors. Spark you can do one at a time.

 

Thanks Dave, I will start a separate thread at a later date along the lines "Selecting and using an oscilloscope for automotive fault diagnosis"

The one question I would have atm is "Do you see any real need for more than 2 channels?"

Bear with us OP, keeps your thread alive