Diagnose My Rig. Please?

[Willstar Lurker Find all posts View Profile Close Willstar]

Hi all,

Trying to diagnose an annoying rattle in my 2010 ZR D4D with 85000 Kms, which:
-comes on when under load between 1800-2200 RPM.
-does not occur when revving in neutral/at standstill.
-is there regardless of operating temperature but is louder when cold.
-sounds similar to lifter noise, like stones rattling in a can.

First thought was injectors, but these are well within acceptable values.
Could this be an intake/airflow issue? Oil pickup issue?
I understand that i will probably have to start pulling things apart and checking, but any pointers to where to start? I'm guessing intake system would be first up.

Techstream results:

COLD START
Engine Speed: 876 RPM
MAF: 11.35 gm/sec
MAP: 99 kPa
Coolant: 26 deg
Air: 23 deg
Turbo air: 20 deg
Engine run time: 46 sec
Injector Volume: 11.87
Injector feedback volume: -2.43
Injector feedback value #1: -1
Injector feedback value #2: -1.1
Injector feedback value #3: 1.4
Injector feedback value #4: 0.3
EGR Pos: 65.8%

OPERATING TEMPERATURE
Engine Speed: 699 RPM
MAF: 8.68 gm/sec
MAP: 97 kPa
Coolant: 83 deg
Air: 23 deg
Turbo air: 30 deg
Engine run time: 1232 sec
Injector Volume: 7.63
Injector feedback volume: -4.48
Injector feedback value #1: -0.0
Injector feedback value #2: 0.3
Injector feedback value #3: -0.4
Injector feedback value #4: -0.2
EGR Pos: 47.8%

[Willstar Lurker Find all posts View Profile Close Willstar]

Edited. Second list is operating temperature, not cold start

[gspy4u Senior Member Find all posts View Profile Close gspy4u]

I have had that since mine was new.
Original Injectors did it, changed them out at 180,000k but were still in spec. New injectors did it but they only lasted 50,000k's before going out pf spec. ???
Brand new Denso DLC ones put in at 240,000k and guess what, they do it as well.

Does the exact same noise as yours around 1800 - 2200 rpm. Mainly just on throttle, like if you are coasting and then press accelerator or the cruise comes on and off at those rpm's. Doesn't seem as noticeable if you are revving harder though.

Stuffed if I know what it is but it has been happily doing it for the last 240,000 k's so guess i just need to stop listening.
If anyone else has ideas ? but doesn't to seem to be doing anything otherwise it would have blown up by now.

[Willstar Lurker Find all posts View Profile Close Willstar]

I have had that since mine was new.
Original Injectors did it, changed them out at 180,000k but were still in spec. New injectors did it but they only lasted 50,000k's before going out pf spec. ???
Brand new Denso DLC ones put in at 240,000k and guess what, they do it as well.

Does the exact same noise as yours around 1800 - 2200 rpm. Mainly just on throttle, like if you are coasting and then press accelerator or the cruise comes on and off at those rpm's. Doesn't seem as noticeable if you are revving harder though.

Stuffed if I know what it is but it has been happily doing it for the last 240,000 k's so guess i just need to stop listening.
If anyone else has ideas ? but doesn't to seem to be doing anything otherwise it would have blown up by now.

Well that's reassuring, thanks.
Have you had the carbon cleaned from your intake before? If so, did it make a difference?

[Anth120playdo Banned Find all posts View Profile Close Anth120playdo]

Hi all,

Trying to diagnose an annoying rattle in my 2010 ZR D4D with 85000 Kms, which:
-comes on when under load between 1800-2200 RPM.
-does not occur when revving in neutral/at standstill.
-is there regardless of operating temperature but is louder when cold.
-sounds similar to lifter noise, like stones rattling in a can.

First thought was injectors, but these are well within acceptable values.
Could this be an intake/airflow issue? Oil pickup issue?
I understand that i will probably have to start pulling things apart and checking, but any pointers to where to start? I'm guessing intake system would be first up.

Techstream results:

COLD START
Engine Speed: 876 RPM
MAF: 11.35 gm/sec
MAP: 99 kPa
Coolant: 26 deg
Air: 23 deg
Turbo air: 20 deg
Engine run time: 46 sec
Injector Volume: 11.87
Injector feedback volume: -2.43
Injector feedback value #1: -1
Injector feedback value #2: -1.1
Injector feedback value #3: 1.4
Injector feedback value #4: 0.3
EGR Pos: 65.8%

OPERATING TEMPERATURE
Engine Speed: 699 RPM
MAF: 8.68 gm/sec
MAP: 97 kPa
Coolant: 83 deg
Air: 23 deg
Turbo air: 30 deg
Engine run time: 1232 sec
Injector Volume: 7.63
Injector feedback volume: -4.48
Injector feedback value #1: -0.0
Injector feedback value #2: 0.3
Injector feedback value #3: -0.4
Injector feedback value #4: -0.2
EGR Pos: 47.8%

General info: the 150 are quieter than the 120.
120 do often have some normal noise around like above mentioned.
Generally 150's don't.
Even when diagnostics look ok, the injectors can be worn & not operating smoothly, causing noises.

As far as diagnostics go, what about the rest of the relevant info?
Load?
Timing?
Duration?

[Willstar Lurker Find all posts View Profile Close Willstar]

General info: the 150 are quieter than the 120.
120 do often have some normal noise around like above mentioned.
Generally 150's don't.
Even when diagnostics look ok, the injectors can be worn & not operating smoothly, causing noises.

As far as diagnostics go, what about the rest of the relevant info?
Load?
Timing?
Duration?

What are these values listed as in techstream?
Let me know which ones are relevant and I'll post them.

[Anth120playdo Banned Find all posts View Profile Close Anth120playdo]

What are these values listed as in techstream?
Let me know which ones are relevant and I'll post them.

I did. Load, timing, duration/period.

Duration is in this picture


Just look up acceptable values, as you did with your other parameters.

[Willstar Lurker Find all posts View Profile Close Willstar]

Ok.
Acceptable values vary.
Could you please have a look at these?

COLD
injection volume 11.87
Main injection period 666
Main injector timing 4.6

WARM
Injection volume 7.63
Main injection period 540
Main injector timing 4.6

Your feedback would be great

[Willstar Lurker Find all posts View Profile Close Willstar]

Ok.
Acceptable values vary.
Could you please have a look at these?

COLD
injection volume 11.87
Main injection period 666
Main injector timing 4.6

WARM
Injection volume 7.63
Main injection period 540
Main injector timing 4.6

Your feedback would be great

[Willstar Lurker Find all posts View Profile Close Willstar]

Oh and calculated load
Cold 21.9%
Hot 14.1%

[Anth120playdo Banned Find all posts View Profile Close Anth120playdo]

Yeah so from what I see, they're not too bad.
Just remember they're 7years old & not full DLC.
New ones are full DLC & lasting much longer.
Good readings, does not eliminate noise from worn injectors.