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2001 Opel Zafira Z18XE Engine: Solving Idle Stalling, Rough Idle & P0170 Code Issues

fotiscar 5103 6
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  • Check fuel pressure and vacuum leaks next

    #1 19987764
    fotiscar
    Level 1  
    Posts: 1
    hello everyone i have a problem with my zafira model of 2001. engine code z18xe.
    i changed maf sensor, coils, spark plugs, knock sensor, lambda sensors both of them but it keeps showing fault code p0170 running rich and between 1000 to 1500rpms the engine stalls and idles rough. can anyone help me on what i should search next? I also tried a used ecu on the car but the problem remains. I dont know if the ecu was working correctly or not. the seller said it was okay but the problem remained.
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  • #2 20022051
    wakycampa
    Level 2  
    Posts: 3
    Hello, can you do a fuel pressure test on the injector manifold? Same thing happened to me and it was a bad fuel pump.
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  • #3 20022100
    grala1
    VAG group specialist  
    Posts: 9823
    Help: 1495
    Rate: 5052
    What about the fuel pump?
    The error number itself does not say anything because it is not known whether the mixture is lean or rich.
    It would be useful to read both lambda sensors while driving along with the reading from the flow meter and the measurement of the fuel pressure.
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  • #4 20022620
    michal_rybka
    Level 35  
    Posts: 2652
    Help: 283
    Rate: 771
    and the shaft position sensor? usually it causes jerking, fading out, etc.
    you can disconnect the camshaft position sensor for the test. without it, there is no multipoint injection, only all injectors are injected at once, but the engine has to work
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  • #5 20023057
    Anonymous
    Level 1  
  • #6 21584806
    iuliancristian
    Level 2  
    Posts: 10
    1. Throttle body. Is it clean? Are the plastic wheels inside loose?
    2. Is the timing chain in order? Is the chain making noise? An incorrectly adjusted phasing disc affects idle speed.

    Check the pressure in the fuel rail with a pressure gauge.
  • #7 21630540
    Ecusale
    Level 1  
    Posts: 1
    >>21584806 >>21584806

    Did you manage to find a solution?
    I can help you solve this problem.
    Based on your description, it looks like the engine control unit might be faulty.
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Topic summary

LABEL_AI_GENERATED
A 2001 Opel Zafira with Z18XE engine has rough idle, stalling between 1000 and 1500 rpm, and fault code P0170. Several parts were already replaced, including the MAF sensor, ignition coils, spark plugs, knock sensor, both lambda sensors, and even a used ECU, but the problem remained. Suggested next checks include fuel pressure testing at the injector rail, inspecting the fuel pump, reviewing live data from the ECM, monitoring lambda and MAF readings while driving, checking fuel trims/corrections, testing the camshaft position sensor, cleaning and inspecting the throttle body, and verifying timing chain condition and fuel rail pressure.
AI summary based on the discussion. May contain errors.
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