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Non-Starting Buzzing Noise (Vid Included)


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#1 Rosssco

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Posted 14 July 2019 - 08:19 PM

Anyone had similar?

 

https://www.youtube....h?v=Rz9hxqArCKU



#2 The Batman

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Posted 18 July 2019 - 12:39 AM

sounds like a injector



#3 Rosssco

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Posted 18 July 2019 - 06:52 AM

sounds like a injector

 
Yep, but changed them all.. Same.



#4 Exmantaa

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Posted 18 July 2019 - 10:14 AM

Can you feel or hear what part is making that noise? (use a long screwdriver to your ear as a stethoscope...)

 

Not may parts on the engine that can make such noise; Injectors? EVAP valve? EGT valve? Maybe throttlebody? That's probably it on a Z22SE...

Extreme high voltage sparking can also sound a bit like that, but that would be very weird. (> coilpack)

 

Maybe a strange pulsation in your fuelpressure causing this noise?


Edited by Exmantaa, 18 July 2019 - 10:16 AM.


#5 Rosssco

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Posted 18 July 2019 - 10:30 AM

Can you feel or hear what part is making that noise? (use a long screwdriver to your ear as a stethoscope...)
 
Not may parts on the engine that can make such noise; Injectors? EVAP valve? EGT valve? Maybe throttlebody? That's probably it on a Z22SE...
Extreme high voltage sparking can also sound a bit like that, but that would be very weird. (> coilpack)
 
Maybe a strange pulsation in your fuelpressure causing this noise?

 
Its a weird one.. Pretty sure its coming from the fuel rail, as you can feel a high-frequency vibration when you touch it. Pretty sure its an injector but I've changed both those and the entire engine loom. No change. ECU seems ok (used OBD Tuners, checked for fault codes etc.).

 

Will start and run occasionally. After a few 'cold' starts it usually will not start, and makes this buzzing noise.

 

I have a throttle body on the way from Joe, and a new brown relay. I did note the brown relay was sorta luke warm to touch (compared to the others) but no idea if that's relevant..

 

FPR could be the issue, but that wouldn't stop the engine from clicking and no starting.

 

FYI, as part of this 8 month adventure, I have changed:

  • Injectors
  • Coilpack
  • Alternator
  • Starter
  • Battery
  • Grey relay
  • Yellow relay (borrowed to test)
  • Complete engine loom
  • T-map
  • New chargecooler pump wiring and relay

Cleaned inspected:

  • Main engine bay connector (big 4-pin plug)
  • All earths
  • X2 / X3 connectors
  • All 3 boot relay connectors
  • Cut off switch 
  • Battery terminals
  • Front chassis earth

Was thinking of changing the full front to rear loom but that's a really big job apparently.



#6 ee601

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Posted 18 July 2019 - 12:53 PM

I had exactly this a while back. I think it turned out to be a dodgy earth or poor battery. How is your battery charge?
Just a thought..


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#7 Rosssco

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Posted 18 July 2019 - 02:17 PM

I had exactly this a while back. I think it turned out to be a dodgy earth or poor battery. How is your battery charge?
Just a thought..


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I've checked all the earths and the battery was new this year. Been charged multiple times and has plenty juice to turn the starter over..



#8 Exmantaa

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Posted 18 July 2019 - 02:41 PM

Not easy to reach these, but unclip the injector plugs and repeat to see if it's the fuelrail itself making this noise (fuel resonance, pump/regulator issue), or when the buzzing is gone its something electrical on your injectors/wiring.

(injectors get a direct +12v feed through the X connectors and are pulse-grounded by the ecu. => Check +12V wiring (relays boot + x connector pin 1) + and proper ecu connectors & ground wire...)


Edited by Exmantaa, 18 July 2019 - 02:47 PM.


#9 Exmantaa

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Posted 18 July 2019 - 02:42 PM

And borrow a fuel pressure gauge to monitor your fuel pressure on the rail



#10 Rosssco

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Posted 18 July 2019 - 03:07 PM

Not easy to reach these, but unclip the injector plugs and repeat to see if it's the fuelrail itself making this noise (fuel resonance, pump/regulator issue), or when the buzzing is gone its something electrical on your injectors/wiring.
(injectors get a direct +12v feed through the X connectors and are pulse-grounded by the ecu. => Check +12V wiring (relays boot + x connector pin 1) + and proper ecu connectors & ground wire...)

 
Pretty sure I've checked them all individually (unplugged one at a time) to no avail.. Plus this wouldn't cause a non-starting issue - plenty fuel going in as you can smell it after a few cranks (trying to avoid bore wash!)

 

I thought maybe a dodgy injector clip, but changed all those for new along with engine loom..

 

Checked for a good ECU earth, visual check and clean of all ECU connectors (changed the loom just in case of a broken wire).

 

It now starts fine 2 - 3 times, then gradually struggles, then just won't.. The engine would die if you tried to gently rev it, but this seems to have fixed itself.. Feels like its 'electrically haunted'.. :lol:


Edited by Rosssco, 18 July 2019 - 03:08 PM.


#11 techieboy

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Posted 18 July 2019 - 03:46 PM

Fuggered injector driver(s) inside the ECU?



#12 Exmantaa

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Posted 18 July 2019 - 04:09 PM

 


 
Pretty sure I've checked them all individually (unplugged one at a time) to no avail.. Plus this wouldn't cause a non-starting issue - plenty fuel going in as you can smell it after a few cranks (trying to avoid bore wash!)

 

I thought maybe a dodgy injector clip, but changed all those for new along with engine loom..


 

 

Unplug all just to see if the buzzing stops => Injector/ecu/wiring issue

Still buzzing => fuelpump/pressure related.

 

Maybe you can borrow a fuel pressure tester from a local garage and see if your rail pressure is correct and stable.

https://www.amazon.c...r/dp/B000R5IASC



#13 vocky

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Posted 18 July 2019 - 04:43 PM

I have seen this fault before, think it was the throttle body or a 5v back feed from something



#14 pete-r

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Posted 18 July 2019 - 05:41 PM

I would just start unplugging things in the loom until it goes away and go from there.

#15 Rosssco

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Posted 20 July 2019 - 09:54 AM

Cheers for responses.

Injector drivers - hmm, hope not.! Engine now (occasionally starts and runs / idles ok). It was majorly over fuelling when I recently restarted it (proper black smoke!) but that has subsided now I’ve put the original base map back on it. Seems to start and run a little better too..

Fuel injectors and basically going through unplugging everything is next thing.

Throttle body is next on the list - I noted that since putting the new 2.0 Saab motor in it about 18month ago, it’s been over-fuelling a bit on hard acceleration. More evident in warm weather. Perhaps a faulty TB could be the culprit in both issues, not opening enough so running a little rich. And now finally given up the ghost..

#16 Ali87

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Posted 22 July 2019 - 09:30 PM

Had a similar buzzy sound when my alternator shat itself

#17 Rosssco

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Posted 23 July 2019 - 07:49 AM

Had a similar buzzy sound when my alternator shat itself

 
Changed it for a brand new OEM one man..



#18 Steviejay

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Posted 23 July 2019 - 09:13 PM

Is it sorted now?

#19 Rosssco

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Posted 24 July 2019 - 07:16 AM

Is it sorted now?

 
Nope. Haven't had an opportunity to try the replacement throttle body yet though.



#20 Rosssco

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Posted 25 July 2019 - 07:06 PM

As predicted, replacement throttle body and brown relay, no change - has a few starts from cold, but hot starts the fuel rail buzzing restarts and it just turn over..

 

So to add to the list (I like lists):

 

  • Injectors
  • Coilpack
  • Alternator
  • Starter
  • Battery
  • Grey relay
  • Yellow relay (borrowed to test)
  • Complete engine loom
  • T-map
  • New chargecooler pump wiring and relay
  • Replacement throttle body
  • Brown relay

I started un-plugging things to stop the buzzing. It stops when:

  • All injectors removed (it will still buzz if any of the clips are in place. Checked individually)
  • Throttle body plug removed
  • Either X2 or X3 connectors

I've sent Peter @ OBDT and email to check the cost for a replacement ECU if I send him a 'blank' and my existing ECU. Hopefully its not the full price (as I've bought it for a couple of cars now..)






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