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Old February 21st, 2018, 22:35   #1
yabay
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Join Date: Dec 2016
Location: Turkey
Default excessive Fuel consumption

Hi, I have a 2005 Caddy 1.9 TDI BJB 2005, My car comsumes excessive fuel. I have done several things but no chance

What have done:

No faulty sensor
No fault code
torsion is +0.5 (also tested -3 , 0.00 etc now testing +2.0)
2 times i'adjusted the injectors top end to stabilize the idle.
Injectors are in good condition. We serviced them 2 times nozzles,leak and checked then ultrasound cleaned etc.
Turbo is new , No leakage, no limp mode, vanes moves freely
No vacuum leak
Tandem works well
no cam wear,
Compression is good,
starts in the first crank hot or cold.
All filters oil change periodicly,
Maf reads in specs,
Map read in specs (also replaced them to check)
İn 5-10 minutes coolant hits 90c car heats up well.

Today i will take screenshots and show the measuring blocks.
(I have Delphi DS150E and VCDS )

Any idea will accepted. Thank you guys...

Last edited by yabay; February 21st, 2018 at 23:34.
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Old February 22nd, 2018, 04:01   #2
scooperhsd
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Location: Kansas City KS
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First - define Excess fuel consumption , in terms of MPG or L/KM, so we can tell you if it's inline or not.
Thanks
__________________
2000 Red NB TDI, 350,000+ miles
Now 5 speed manual and onto 500,000 miles + !
2015 Golf TDI SE DSG
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Old February 22nd, 2018, 05:43   #3
Mongler98
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Location: Northern MD
Fuel Economy: Race: 12mpg, Gandma:65mpg
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yeaa, What ^^^^^^ Said
we need more information, what you did before, any emissions fix things, and so forth and what your old milage was, and is now, LPM or GPH at ilde, and at certain rpm on each gear and so forth. This can all be logged with VCDS or visible from a scangauge II, sounds like your on it, report back with more details please.
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Old February 22nd, 2018, 07:26   #4
yabay
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My cons. is 10 liters / 100km









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Old February 22nd, 2018, 10:21   #5
Carlos_TJ
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Hello
Is the BJB engine Unit Injector (PD) or CR?

Your injector deviation is not the best.
While range is +/- 2.99 in practice anything above 0.50 should be investigated and anything over +/- 1.00 usually means something is likely wrong.

Also, on a normal engine, the values along each injector should be numerically close.

In the case of PD engines could mean
- worn out cam lobes
- defective injector (clogged, deffective pattern etc)
- wrong backlash

In the case of PD engines, the Injector deviation directly reflects the electrical signal (amperage? PWM duty cycle?) to each injector in order to mantain the angular speed of the crankshaft.



That is why there a several possible causes to those numbers.

Hope this helps

Last edited by Carlos_TJ; February 22nd, 2018 at 10:23.
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Old February 22nd, 2018, 10:27   #6
yabay
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Carlos,i think you can help me,

My BJB is pue Pump Duse

Cams or lobes are ok.
Injectors took out by my self and serviced with a pro. he've said that worn out cam lobes can couse to this problem. these 2 parts are all in good condition.

-Wrong backlash? ( do you mean about injector top end adj.?) i've tried 4-5 times adjusment, nothing changed.
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Old February 22nd, 2018, 10:31   #7
yabay
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let make it clear .

In the case of PD engines, the Injector deviation directly reflects the electrical signal (amperage? PWM duty cycle?) to each injector in order to mantain the angular speed of the crankshaft.

Last edited by yabay; February 22nd, 2018 at 10:50.
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Old February 22nd, 2018, 10:39   #8
Carlos_TJ
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There is no direct feedback of fuel injected back to the ECU.
The ECU monitors the angular speed of the crank. It is so precise and high resolution that the ECU can measure the effect of each cylinder/injector to the engine speed. If the contribution of a given piston/injector does not match the specified speed, the ECU will try to compensate by changing the signal to that specific injector. It may even change the setting for the adjacent injector in order to normalize the engine speed.

Does your car produce black smoke when accelerating?
Does it produce heavy pinging sound when accelerating?
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Old February 22nd, 2018, 10:46   #9
Carlos_TJ
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I also should mention that PD injector install is a delicate job where they are easy to damage if not careful when seating the injector.

You dont mention your mechanical skill. Did you follow VW spec? Did you use their tool?


Also, we are asuming you have a healthy enginw block
---> cylinder compression inside specification

Last edited by Carlos_TJ; February 22nd, 2018 at 10:48. Reason: Added more
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Old February 22nd, 2018, 10:55   #10
yabay
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Does your car produce black smoke when accelerating?
Does it produce heavy pinging sound when accelerating?

I'll record the all situation of my car asap.
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Old February 22nd, 2018, 11:04   #11
yabay
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Quote:
Originally Posted by Carlos_TJ View Post
I also should mention that PD injector install is a delicate job where they are easy to damage if not careful when seating the injector.

You dont mention your mechanical skill. Did you follow VW spec? Did you use their tool?


Also, we are asuming you have a healthy enginw block
---> cylinder compression inside specification

we seat the pd injectors precise when installing to the engine.
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Old February 28th, 2018, 06:04   #12
yabay
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Any one have a different idea?
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