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Opel Meriva 1.6 16V 2007: Addressing Single Cylinder Misfire & Check Light Issues

pawliszon1981 9606 15
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  • #1 16627107
    pawliszon1981
    Level 16  
    Hello. I am struggling with the problem of misfiring on the second cylinder in the engine as in the topic. Factory gas installation Opel Landi Renzo. Symptoms: on gas at idle speed "limps", on high speed it goes, on gasoline and on gas at low speed, there is no accumulation while driving, of course, the check also lights up. After deleting the error on petrol, a probe error pops up, and on gas, the ignition of the 2nd cylinder is also misfired. Gas injector replaced (unnecessary), no change. Sealed intake manifold because it gently sucked the left air, no change. Candles replaced, no changes. Replaced the pneumothorax diaphragm because it was cracked, no changes. Compression on each after 17, gasoline injections tight. The coil has not been replaced yet because the cost of the dispute has accumulated, especially since it is not certain that it is a coil. Anyway, someone mentioned me recently, because the date from 2016, some kind of trip. Is it possible to check the coil reliably? Or is it something else? I would like to add that after squeezing the gas supply hose to the 2nd cylinder, the change in engine operation is practically imperceptible.
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  • #2 16627112
    kkknc
    Level 43  
    The coils can be replaced. LPG injections in places too. Works OK at PB?
  • #3 16627172
    pawliszon1981
    Level 16  
    The original coil would be PLN 300, I'm just afraid that it may not be it again. Swap injections, swapped plugs, even test swapped gas supply hoses, i.e. 3rd injection connected to 2 cyl. and 2 under 3 cyl. Still misfire on cylinder 2. The petrol runs evenly, although I have the impression that up to 2500-2700 rpm. him mussels.
  • #4 16628179
    grala1
    VAG group specialist  
    Not too high compression pressure?
    What is this probe error?
    Swapping LPG hoses between cylinders would suggest a problem with the coil or the mixture on the second cylinder. There could be a problem with a tacky coil replacement.
    You wrote that you unfastened the LPG hose on the 2nd cylinder and no reaction - no reaction to LPG or PB?
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  • #5 16628392
    Doktorr
    Level 35  
    What is the vacuum at idle speed?
  • #6 16628491
    pawliszon1981
    Level 16  
    Komprecha as I wrote, I was not wrong. Probe error behind the catalyst, heater or heater circuit, I don't remember anymore. But by resetting the error while driving and driving continuously with revolutions above 2500, the error does not occur. I unfastened the hose as well as squeezed it, but only on lpg. The injector gives gas, the hose sucks in the same way as the others. Virtually everything has been checked except the coil, I have nothing to replace at the moment. Tomorrow I will check the spark, maybe it will be visible. I do not want to buy blind again because I have already spent PLN 600 unnecessarily.
  • #7 16628966
    Doktorr
    Level 35  
    I did not ask about compression, only about the vacuum in the intake manifold at idle speed. The B1S2 probe error has no effect on engine operation. (measure the heater resistance, if wrong, replace the probe).
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  • #8 16629450
    apoloniuszg
    Level 10  
    After the vacuum value, we will find out how the engine works at idle
  • #9 16629480
    Doktorr
    Level 35  
    The vacuum value can rule out several faults that give the same symptoms.
  • #10 16630110
    pawliszon1981
    Level 16  
    The probe error is P0136. As for the coil, it can be excluded because it was replaced and nothing has changed. I will measure the vacuum and give it tomorrow.
  • #11 16632393
    pawliszon1981
    Level 16  
    Vacuum 0.35bar.
  • #12 16632997
    Doktorr
    Level 35  
    Close to correct. That would rule out fake air, an egr tilted, and fired valves. If it's z16xep, do such an experiment, download the EGR plug and wait until it catches the error, then see if it will be better with the EGR error.
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  • #13 16635014
    pawliszon1981
    Level 16  
    The engine is 16xep. Earlier, I entered a different error code by mistake, mixed it with another car. It's not P0136 but P0141. I unplugged the plug from the EGR and caught the P1405 error. The only change was that sometimes there were single fluctuations in turnover.
    What is the chance it's a gas controller? Nobody contacted him because he is "blocked" by the Opel service in which he was set up.
  • #14 16669849
    pawliszon1981
    Level 16  
    I will come back to the topic because the problem is still not solved. I bought an identical Landirenzo driver, the one I have is dedicated to the Z16XEP meriva, the new one can be said to be general. Do I need to replace anything else when replacing the driver? It does not start at all on a new car.
  • #15 16669879
    kkknc
    Level 43  
    How efficient and for this engine it must burn.
  • #16 16670992
    psooya
    Level 38  
    You have to connect and set it to the bank.
    Maybe the injection beam should be checked? The executioner's patience because he smells the stench of the super factory gas.
    After replacing it, it should run on pb if the ecu lpg is operational.
    And how with the flaps in the intake, because it probably already has?
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Topic summary

✨ The discussion revolves around a misfire issue in the second cylinder of a 2007 Opel Meriva 1.6 16V, particularly when running on LPG. The user reports symptoms such as poor performance at idle and a check engine light. Various components have been replaced or checked, including gas injectors, spark plugs, and the pneumothorax diaphragm, but the problem persists. The user has also swapped LPG hoses and checked compression, which is normal. Errors related to the oxygen sensor (P0136) and the catalyst heater (P0141) have been noted, but they do not seem to affect engine operation. The vacuum at idle is measured at 0.35 bar, ruling out certain faults. The possibility of a faulty gas controller is raised, and the user is considering replacing the Landi Renzo driver, which is specific to the Z16XEP engine. Further diagnostics and adjustments are suggested, including checking the injection beam and ensuring proper settings for the new driver.

FAQ

TL;DR: Opel Meriva Z16XEP with a 1‑cylinder misfire: compression OK is reported, and “The B1S2 probe error has no effect on engine operation.” Focus on ignition, fueling, vacuum, and EGR checks before swapping ECUs. [Elektroda, Doktorr, post #16628966]

Why it matters: This FAQ helps DIYers quickly isolate a stubborn single‑cylinder misfire on factory‑LPG Meriva 1.6 16V without wasting money on parts.

Quick Facts

How do I quickly narrow down a single‑cylinder misfire on a Z16XEP with LPG?

Confirm spark, fuel, and air on the suspect cylinder. Swap LPG injectors/hoses and spark plugs between cylinders. If misfire stays on the same cylinder, look at ignition coil pack, wiring, vacuum leaks, or EGR effects. Users swapped injectors, hoses, and plugs with no change on cyl. 2, pointing away from LPG hardware. [Elektroda, pawliszon1981, post #16627172]

Does the car run evenly on petrol, or only on LPG?

The case described runs evenly on petrol but shows hesitation up to 2500–2700 rpm, while LPG idles roughly and misfires on cylinder 2. That behavior suggests an issue visible on both fuels at low load. Check ignition and air management first. [Elektroda, pawliszon1981, post #16627172]

What does DTC P0141 mean here, and does B1S2 affect drivability?

P0141 indicates a heater circuit fault for the downstream oxygen sensor (Bank 1 Sensor 2). In this case, the expert notes B1S2 does not affect engine operation, so fix it separately from misfire diagnostics. “The B1S2 probe error has no effect on engine operation.” [Elektroda, Doktorr, post #16628966]

What idle manifold vacuum should I expect, and what does 0.35 bar imply?

Reported vacuum was ~0.35 bar at idle and judged close to correct. That level helped rule out false air, a stuck‑open EGR, and burned valves in this context. Next steps should shift toward ignition control and mixture on the affected cylinder. [Elektroda, Doktorr, post #16632997]

How do I perform the EGR unplug test on the Z16XEP?

  1. With engine off, unplug the EGR electrical connector.
  2. Start and drive until the ECU logs an EGR fault.
  3. Compare idle and low‑rpm smoothness with EGR disconnected. If it improves, investigate EGR sticking or control. [Elektroda, Doktorr, post #16632997]

Could the ignition coil be the culprit?

Yes, coils can cause single‑cylinder misfires. However, in this thread the coil pack was replaced and the fault remained, so the coil was excluded in that vehicle. Always verify with cylinder‑specific spark checks before buying parts. [Elektroda, pawliszon1981, post #16630110]

How can I rule out an LPG injector or rail issue?

Swap LPG injectors or even cross the hoses between cylinders. If the misfire does not move to the other cylinder, the injector/rail is unlikely. Here, swapping injectors and hoses left the misfire on cylinder 2, so attention moved elsewhere. [Elektroda, pawliszon1981, post #16627172]

What does squeezing or disconnecting the LPG hose to the bad cylinder tell me?

If clamping or unplugging the LPG hose to the suspect cylinder barely changes idle, that cylinder contributes little at idle on gas. It suggests an ignition or mixture issue local to that cylinder. Use it as a quick isolation check. [Elektroda, pawliszon1981, post #16627107]

Is my compression healthy? I measured 17 across all cylinders.

A reported 17 (bar) on all cylinders indicates strong and even compression, so mechanical sealing is likely fine. Focus diagnostics on spark, fueling, EGR behavior, and intake tract issues rather than internal engine wear. [Elektroda, pawliszon1981, post #16627107]

What does P1405 after unplugging EGR mean for drivability?

P1405 flags an EGR‑related issue after unplugging its connector for the test. In the case described, the only change was occasional idle fluctuations. That result aligned with vacuum being near normal, reducing suspicion of a stuck‑open EGR. [Elektroda, pawliszon1981, post #16635014]

I replaced the Landi Renzo LPG ECU and the car won’t start on gas—what’s missing?

You must connect and configure the new controller for the car. After replacement, it should still run on petrol if the LPG ECU is operational. “You have to connect and set it.” This is a common edge case after ECU swaps. [Elektroda, psooya, post #16670992]

Will a downstream O2 heater fault (P0141) cause my misfire or rough idle?

No. The downstream sensor monitors the catalyst and does not control mixture. Fix the heater circuit for emissions compliance, but continue misfire diagnosis separately. This separation saves time and avoids chasing unrelated faults. [Elektroda, Doktorr, post #16628966]

Does swapping petrol injectors help isolate the fault?

Yes. The thread notes petrol injectors were checked and tight, and swapping LPG components did not move the misfire. If petrol injector swaps make no difference, keep focus on ignition, wiring, or intake/EGR effects. [Elektroda, pawliszon1981, post #16627107]

What should I check if low‑rpm hesitation appears on both fuels?

Shared symptoms on petrol and LPG point to non‑fuel‑specific causes. Inspect ignition coil control, plugs, wiring, manifold vacuum integrity, and EGR influence. Vacuum judged near normal helped deprioritize air leaks and valve issues in this case. [Elektroda, Doktorr, post #16632997]

Any cost tips before I buy parts blindly?

An OE coil was cited at ~PLN 300. Before spending, swap components side‑to‑side, verify spark on the suspect cylinder, and run the EGR unplug test. This reduces unnecessary purchases. [Elektroda, pawliszon1981, post #16627172]
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