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The exact cause of the issue had been found to be that of a loose alternator belt. When the engine was cold, the alternator had a slack in it and if the AC load is added on the engine, the rpm fluctuated. Solution was simply to tension the alternator belt. Well, thanks to all for sharing the knowledge.


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Since the starter picked up speed as you cranked, I would suspect bad connections from the battery down to the starter. I have seen this before and simply disconnecting the large cable from the battery to the starter and cleaning the terminals with wire wool and reconnecting them totally changed the speed of the starter. Also clean the battery connectors, ...


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Glow plugs are not necessarily the problem. You said the engine turned over slowly. If turning was exceedingly slow then the battery would be more likely, not enough juice for the engine to gain momentum. If the engine turns over normally but just won't start, and when it does the start is "dirty", then the glow plugs are very likely. They aren't difficult ...


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Guessing. May be due to looping of 2 governors? Your car software tries to maintain the idle rpm. The AC temperature governor tries to maintain temperature, but some clogs in coolant path or issues with compressor leads to variable load on engine. Make sure AC system serviced once.


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Actually with modern engines, they can and do come on after startup. I think the reasons are spelled out fairly well in this article on Engine Builder Magazine: The government wanted to reduce the amount of diesel hydrocarbons and nitrogen oxide levels being emitted from diesel engines. Now, this is where the importance of the glow plugs comes in. Not ...


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Or could be your mass airflow sensor because I have similar issues and that is what's wrong with my car


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It is not actually. The OBD2 sensors probe the throttle positions in terms of percentage, not the actual mechanical position. The idle of the vehicle Volkswagen polo was governed by ECM, and the rpm varies from 550 -900rpm and most standard is 600-800. It was based on the various factors as below. Ambient temperature Engine temperature Fuel Quality ...


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I don't know specifically about your car but in general it is possible. Some cars have a cam that opens the throttle plate when the engine is cold to increase the idle. My 99 Nissan Almera has such a cam. The cooling system has two purposes. The obvious one is to disperse excess heat and prevent the engine from overheating. The less obvious one is to ...


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No. Glow plugs are used only during colder temps. Once the motor starts the combustion process has begun and no longer requires additional heat. Like fusion once it starts it ignites itself!🍻


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In this case replacing the fuel filter for new seems to have done the trick. I was able to find one for roughly £27 on eBay and fitted it myself in under 45 minutes. Thought I'd leave the information here in case anyone else has the same issue.


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It has to get HOT. As you seem to know and elude to by asking if sitting and idling at a higher RPM could resolve the issue. If the car is fit can you just drive it in a lower gear at a higher RPM? Not savagly high like a teenager but reasonably high. If you would be in 5th on the freeway can you drive it in 4th? Some DPF's can get seriously clogged up ...


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If you have changed major parts of the engine/transmission, you have almost certainly introduced air into the fuel lines or injection system. This will prevent fuel getting to the engine as the fuel injection becomes "airbound" - ie it can no longer pump the diesel through. Bleeding the fuel lines is as simple as starting from the tank and using the fuel ...


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They aren't better for the environment But efficiency is often confused with emissions. The average person would think that because diesel engines are more efficient and burn less fuel, they must be less harmful to the environment. I think few can be more authoritative than the folks at Bosch on why diesel engines are so prevalent (emphasis my own)¹: ...


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One possibility is that the turbo is sometimes over-boosting, which is being detected by the engine MAP sensor. The way that the engine ECU can control this over-boost to avoid engine damage is by limiting the amount of fuel injected into the engine, which would of course cause a sudden drop in power. The over-boost could be being caused by a seized turbo ...



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