Techstream live data analysis

[andy666]

Go for a run and record the reading. Replay and see what boost levels you were getting.

Your target vs actual rail pressure is a bit off too, but that couldd just be the second the snapshot was taken and shouldn't really effect you fuel economy that much.

[boxhead55]

They are new injectors or reconditioned ones?
Reason I ask is you have -2.66 injection feedback for idle. That is very odd for new injectors . Also your injection volume is high 6.79, again odd for new injectors
From this I read the injectors are over fueling and the computer is trying to take fuel from them to get the system correct.
Your your injection feedback values are ok within spec except #3 is a little tired for a new injector. -1.1.

[AshA]

Reconditioned injectors

[AshA]

SCV was also replaced a month before the injectors

[AshA]

Here's the output from TIS before injectors were replaced.


Vehicle Speed 0 km/h
Engine Speed 746 rpm
Calculate Load 20.0 %
MAF 8.92 gm/sec
Atmosphere Pressure 15 psi(abs)
MAP 14 psi
Coolant Temp 69 C
Intake Air 25 C
Intake Air Temp (Turbo) 37 C
Engine Run Time 403 s
Initial Engine Coolant Temp 51.8 C
Initial Intake Air Temp 36.8 C
Battery Voltage 13.8 V
Alternate Duty Ratio 37 %
Accel Position 0.00 %
Accel Sens. No.1 Volt % 15.6 %
Accel Sens. No.2 Volt % 31.7 %
Actual Throttle Position 83 %
Throttle Close Learning Val. 16.7 deg
Diesel Throttle Learn Status OK
Injection Volume 11.64 mm3/st
Inj. FB Vol. for Idle 1.73 mm3/st
Inj Vol Feedback Learning 0.9 mm3/st
Injection Feedback Val #1 -0.2 mm3/st
Injection Feedback Val #2 -1.9 mm3/st
Injection Feedback Val #3 3.7 mm3/st
Injection Feedback Val #4 -2.4 mm3/st
Pilot 1 Injection Period 418 us
Pilot 2 Injection Period 442 us
Main Injection Period 773 us
After Injection Period 0 us
Pilot 1 Injection Timing -21.0 deg
(CA)
Pilot 2 Injection Timing -14.3 deg
(CA)
Main Injection Timing 3.0 deg
(CA)
After Injection Timing 0.0 deg
(CA)
Target Common Rail Pressure 5680 psi(abs)
Fuel Press 5587 psig
Fuel Temperature 38 C
Target Pump SCV Current 1185.0 mA
Target EGR Position 40.3 %
EGR Lift Sensor Volt % 51.1 %
EGR Close Learn Val. 0.84 V
EGR Close Lrn. Val. 0.84 V
EGR Close Lrn. Status OK
EGR VSV OFF
VN Turbo Command 90 %
Starter Signal OFF
Neutral Position SW Signal ON
Stop Light Switch OFF
A/C Signal OFF
# Codes(Include History) 1
MIL ON Run Distance 0 km
Running Time from MIL ON 0 min
Time after DTC Cleared 369 min
Distance from DTC Cleared 170 km
Warmup Cycle Cleared DTC 7
TC and TE1 OFF
Swirl Control Valve VSV ON
ACT VSV OFF
Received MIL from ECT OFF
Shift Position Sig from ECT 1st
A/T Oil Temp from ECT 40.0 C
SPD (NO) 0 rpm
ECT Lock Up OFF

[Rocket55]

Threads merged.

There was already an existing Techstream analysis thread running with excellent information in it, seemed to make common sense to continue that thread on.

Thanks for the link Luxi.

Carry on guys

[boxhead55]

Ok see how your feedback figures are all over the shop. But your injection feedback for idle is adding 1.73. Because of blockage in injectors.
And your total injection volume was 11.64 still very high. UT remember these figures will be fudged by the leaking injectors seats.

[boxhead55]

I suspect you have and injector issue. Have a chat with your suppliers.

[AshA]

What do I tell them?

[boxhead55]

What you have said here in this post

[AshA]

I mean what do people think the cause is?

[DeadlyBeast]

... injector issue.

[Luxi46]

Time after DTC Cleared 36 min
Distance from DTC Cleared 19 km
Warmup Cycle Cleared DTC 1

Hang on mate, beside the possible injector issues you're still having, this part also says that you cleared a faultcode earlier. What was it?

[AshA]

That would have just been from when I disconnected and removed the batteries to be able to check all of the vacuum lines for leaks. Might have been an uncleared code in there from when the fiter was sucking air a few months back due to a faulty filter housing seal.

[BillyGoatCountry]

Here is a screenshot of mine

the vehicle has had aftermarket injectors fitted 2 months ago but fuel economy worsened by 30 % when i expected it to "improve"

i was getting 1560 km per tank with deliberate lightfooted driving , with the new injectors i was getting 1100 km per tank under the same conditions .
( i have now got 31" tyres and suspension lift which brings range down to 960 km per tank )

anything obvious there to indicate a possible cause ?

MAF sensor has been cleaned , MAP filter has been flushed

[boxhead55]

Too cold show us one when at running temp over 70 deg c

[BillyGoatCountry]

any better ?

thanks

[boxhead55]

It all looks ok I would do a pilot learn and clean your maf sensor and map filter.
See if that makes an improvement.

[BillyGoatCountry]

I am looking for a discrepancy of 30 %

the MAF is already clean as stated above , I did strip the ERG tonight and cleaned a 5-6 mm layer of gunk out from the intake , but that wouldn't explain a sudden deterioration in economy just when the new injectors were fitted.

I was told by the people who supplied and fitted the new injectors that the ERG and intake were clean and "required no cleaning"




Further investigation is required

[boxhead55]

What year