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Golf 4 1.9 TDI (1999): High Combustion, 8 L/100HP, 450K km Mileage, Regenerated Turbine & Injectors

Cregeen25 18996 13
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  • #1 16806112
    Cregeen25
    Level 15  
    Posts: 229
    Help: 2
    Rate: 18
    Hi, I have golf 4 from 1999, 1.9 TDi 90 hp, combustion at the level of 8 liters per 100 hp, driving 18 km and for work and further routes calmly to a maximum of 110-120 usually 80-90. I bought it on September 20 this year. Under the computer everything is okay the air flow angle of the injection temperature.
    With the disadvantages of poured injections mentioned all of the used smooth after checking and the new turbine after regeneration all barbell valves wires, no fuel leaks.
    I've already stupidly engine has 450 thousand km
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    #2 16806201
    Anonymous
    Anonymous  
  • #3 16806205
    moto-kord
    Level 28  
    Posts: 800
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    Cregeen25 wrote:
    Under the computer everything is okay the air flow angle of the injection temperature.

    There is still something like the dose of fuel. On which wheels this golfik goes. With rolling resistance
    and the pressure in the tires I do not ask because these little things are certainly OK.
  • #4 16806219
    Cregeen25
    Level 15  
    Posts: 229
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    Do not smoke wogle has the power ignites in the cold like a child so rather. ogumienie 185/65 / r15 summer I had the same only 60 profile
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  • #5 16806220
    Anonymous
    Anonymous  
  • #6 16806225
    Cregeen25
    Level 15  
    Posts: 229
    Help: 2
    Rate: 18
    And what should be the compression ratio?

    Added after 3 [minutes]:

    I will add that the dose also the temperature and the rest in the norm, and the injection angle I still forgot what is the norm because the electrician somehow I do not believe I stated at the start that the turbo has nothing to burn it seems to me that it has because after the change from 10 to 8

    Added after 2 [minutes]:

    Oki in Piatek I have a visit to another electrician I will take photos

    Added after 2 [minutes]:

    And what else surprised me very much It was hard to ventilate him after the change of injections, the wires released only on the hose duct were released a new filter flooded with fuel
  • Helpful post
    #7 16806253
    moto-kord
    Level 28  
    Posts: 800
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    Cregeen25 wrote:
    And what should be the compression ratio?

    Compression pressure
    Normal 25 - 31 (bar)
    A minimum of 19 (bar)
  • #8 16806272
    Anonymous
    Anonymous  
  • #9 16817992
    Cregeen25
    Level 15  
    Posts: 229
    Help: 2
    Rate: 18
    So for the second car on the line for the first time as we checked the injection is the hour of creation and half of the can. The electrician did not give me pics from the engine logs, all paramters seemingly in the norm

    Added after 1 [minutes]:

    Now someone wants to grasp who will check my Pressure on the cylinders
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    #10 16818074
    moto-kord
    Level 28  
    Posts: 800
    Help: 137
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    Cregeen25 wrote:
    The electrician did not give me pics from the engine logs

    Why?, It's a secret? Change this electrician.
    Cregeen25 wrote:
    all parameters supposedly in the norm

    And these NIBs are a big question mark.
  • Helpful post
    #11 16818548
    Strumien swiadomosci swia
    Level 43  
    Posts: 27470
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    Cregeen25 wrote:
    Do not smoke wogle has the power ignites in the cold like a child so rather.

    If you do not smoke then you have a working engine because the lack of air or watering goes into black smoke.

    A dynamic ride sucks fuel, how would you drive the PSJ that would have you and burned 6l / 100km.
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  • #12 16830310
    Cregeen25
    Level 15  
    Posts: 229
    Help: 2
    Rate: 18
    The efficient engine rather blows after almost 29 bars. I am already alone driving a very calm tomorrow I am going to another electrician because the one who checked the engine gave me the bearings for another electrician. Maybe that one will give me access to the logs, however, the Lord checked the pressure. As soon as the injectors were exchanged, the injection angle must be set and this is not to be set in the right way as it should be and the injection angle as it will not be so much smoky even it may be so that it will be hard to light

    Now my question because I have already lost a lot of money for electricians, or the injection angle has something to burn because if it's not a waste of electricity

    Added after 13 [minutes]:

    Strumien swiadomosci swia wrote:
    Cregeen25 wrote:
    Do not smoke wogle has the power ignites in the cold like a child so rather.

    If you do not smoke then you have a working engine because the lack of air or watering goes into black smoke.

    A dynamic ride sucks fuel, how would you drive the PSJ that would have you and burned 6l / 100km.



    Usually, I will change the course with 2.5 thousand revolutions, then 12 km straight 1800 to 2000 with 80-90 cycles, then max. 120 per hour on the 35 km route to the place where 110 to 120 are on the stretch, maximum 15 kilometers and more can not be done built-up area almost everywhere

    Added after 1 [minutes]:

    And how would I drive more dynamically and 10 liters will come out gently
  • Helpful post
    #13 16830399
    robokop
    VIP Meritorious for electroda.pl
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    Basic parameters - boost pressure / achieved and air flow - desired / actual. The faulty flowmeter is usually responsible for excessive combustion in these nozzles, with an efficient engine.
  • #14 16835469
    Cregeen25
    Level 15  
    Posts: 229
    Help: 2
    Rate: 18
    The problem was solved the first time I came to an electrician who wanted me to come back again or not know the robot. The second electrician set the injection angle and replaced the fuel temperature sensor. After leaving the electrician immediately on the cpn to zero the meter completely and went on a route after 100 kilometers at the same station entered 5.7 liters something with the hook after earlier after the replacement of injectors and checking on the first electrician came out less than 8 liters though I was driving the same piece just to check combustion and in practice, I counted as I normally rode about 8.4. Also if I slept now during normal driving, even those 6.5 liters I am satisfied. Thank you for the advice

Topic summary

✨ The discussion revolves around a 1999 Volkswagen Golf 4 with a 1.9 TDI engine, experiencing high fuel consumption of 8 liters per 100 km despite recent maintenance, including injector replacement and turbocharger regeneration. Users suggest checking for potential issues such as leaky intake, fuel dosage, and compression ratios, with normal compression pressure being between 25-31 bar. The author reports that after consulting multiple electricians, the injection angle was adjusted and a fuel temperature sensor was replaced, leading to improved fuel efficiency, dropping consumption to approximately 5.7 liters per 100 km during normal driving conditions.
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FAQ

TL;DR: Fix high 1.9 TDI fuel use by setting correct injection timing and replacing a bad fuel-temperature sensor; this cut consumption from ~8.4 to 5.7 L/100 km. “Set the injection angle and replaced the fuel temperature sensor.” [Elektroda, Cregeen25, post #16835469]

Why it matters: This FAQ helps Golf 4 1.9 TDI owners diagnose and fix excessive fuel consumption with simple, verifiable checks.

Quick Facts

Why is my Golf 4 1.9 TDI using around 8 L/100 km?

In the thread case, incorrect injection timing and a faulty fuel temperature sensor caused high consumption. After setting the injection angle and replacing the sensor, fuel use dropped notably. Start by checking timing on the pump and validating fuel temperature readings in diagnostics. Then verify boost and MAF readings against requested values. This focuses effort on parameters proven to affect economy in VE‑pump TDIs. [Elektroda, Cregeen25, post #16835469]

What fixed the high fuel consumption in the example car?

The owner reported two actions: setting the injection timing correctly and replacing the fuel temperature sensor. After these, a controlled refill showed about 5.7 L/100 km over 100 km, versus roughly 8.4 L/100 km before. This demonstrates how a small sensor fault plus timing error can compound losses. “Set the injection angle and replaced the fuel temperature sensor.” [Elektroda, Cregeen25, post #16835469]

Does injection timing (injection angle) really affect fuel use on VE‑pump TDIs?

Yes. Mis‑set timing raises consumption and can impair starting and smoke behavior. After injector work, timing must be adjusted with diagnostics. The poster noted that an incorrect angle can make starting hard and change smoke, indicating poor combustion phasing. Always recheck the timing graph after injector or pump work. [Elektroda, Cregeen25, post #16830310]

How do I check the right live data to diagnose high consumption?

Log boost pressure (requested vs. actual) and MAF air mass (requested vs. actual). Deviations point to intake leaks, turbo control issues, or a tired MAF. These are the basic parameters seasoned techs check first on this engine family. Use tools like VCDS to capture and compare values during a road test. [Elektroda, robokop, post #16830399]

What is a MAF sensor and how can it raise fuel consumption?

The MAF (mass air flow) sensor measures intake air. If it under‑reads, the ECU may over‑fuel, raising consumption. In these engines, a faulty flowmeter is a common reason for excessive fuel use when the engine is otherwise healthy. Validate by comparing requested vs. actual MAF under load. Replace if persistently low. [Elektroda, robokop, post #16830399]

What compression numbers should I see on a healthy 1.9 TDI?

Expect typical 25–31 bar and a minimum of 19 bar. Compression outside this range suggests mechanical wear or sealing issues. Use a diesel compression tester and warm engine for repeatable results. Large cylinder‑to‑cylinder deltas also warrant attention. [Elektroda, moto-kord, post #16806253]

My engine shows ~29 bar compression at 450,000 km. Is that fine?

Yes. ~29 bar sits squarely within the 25–31 bar typical range. That indicates good mechanical sealing despite the mileage. Focus your diagnosis on fueling, air metering, and timing rather than internal wear. [Elektroda, Cregeen25, post #16830310]

How should I prime the fuel system after injector replacement?

Cranking alone may not fully vent the VE pump. The thread notes that tow‑starting can help the pump prime faster. Also prefill the filter and check for air leaks on the supply and return lines. This reduces starter strain and speeds first start. [Elektroda, 2563317, post #16806272]

What driving style changes fuel consumption the most?

Gentle driving and early upshifts cut fuel use. One poster notes around 6 L/100 km with calm driving on this engine. Keep speeds moderate and avoid unnecessary boosts. Smooth throttle helps VE‑pump TDIs shine in economy. [Elektroda, Strumien swiadomosci swia, post #16818548]

Can spirited driving push a 1.9 TDI toward 10 L/100 km?

Yes. The thread author states that driving more dynamically can nudge consumption to about 10 L/100 km. High RPM, frequent boosts, and rapid accelerations increase fueling and turbo demand. Expect higher usage during such patterns. [Elektroda, Cregeen25, post #16830310]

What should I check on the fuel pump if consumption stays high?

Confirm power and resistance of the fuel dose regulator on the injection pump, and ensure the ECU commands proper dosing. Also collect engine logs to see how dosing tracks load. Faults here can enrich fueling. [Elektroda, 2563317, post #16806220]

Does black smoke always mean a bad engine?

No. Black smoke often points to lack of air or over‑fueling, such as from an intake leak. That forces you to press harder, worsening smoke. Fix leaks and verify air path before condemning the engine. [Elektroda, 2563317, post #16806201]

Do wheels and tires affect consumption on the Golf 4?

Yes. Rolling resistance and tire sizing matter. A respondent highlighted checking wheel setup when diagnosing high usage. Verify tire condition and pressures. Excess drag raises fuel use, especially in city driving. [Elektroda, moto-kord, post #16806205]

Which engine details help mechanics diagnose faster?

Provide the exact motor code and complete scan logs. A poster asked for the engine code and dosing checks to guide testing. Clear data shortens troubleshooting and avoids parts roulette. [Elektroda, 2563317, post #16806220]

Quick how‑to: three steps to diagnose high consumption on a 1.9 TDI

  1. Log requested/actual MAF and boost on a road test.
  2. Check and set injection timing; confirm fuel temperature sensor readings.
  3. Inspect intake for leaks; verify pump dosing controls. These steps mirror what solved the thread case. [Elektroda, robokop, post #16830399]
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