 | Home > Puma (Tdci) > Intermittent 2.2 engine power loss |
 
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| Johan_B Member Since: 20 Sep 2024 Location: Gothenburg Posts: 131   
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I had engine protection kick in a few times last summer due to high cylinder head temperature. I could be wrong but it felt as if there were two steps, first a gentle power restriction and then more severe.
Is it related to high ambient temperature? Check coolant and condition of radiator. Try to read CHT to see if it runs unusually warm. |
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18th Aug 2025 5:10pm |
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| Sybrow Member Since: 31 Dec 2023 Location: Skipton Posts: 43  
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18th Aug 2025 5:23pm |
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| andy63 Member Since: 30 Jun 2023 Location: north east Posts: 815
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I think you are on the right lines , trying to monitor the main pids, but maybe easier done if you use an app like torque and have the phone up on the dash with say maf, rail pressure and manifold boost on the same page..see if anyone of the readings look abnormal or change dramatically when you notice the loss....
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19th Aug 2025 2:37pm |
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| Sybrow Member Since: 31 Dec 2023 Location: Skipton Posts: 43
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OK, looks like you were right. It happened again and this time I noticed the engine temp had shot up into the red and I lost power, after a few seconds it shot back down to the middle again and power was restored. As I'm pretty sure the engine cannot gain that much heat and lose it again in a matter of a few seconds, does this look like a faulty engine temperature sensor?
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19th Aug 2025 8:06pm |
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| Johan_B Member Since: 20 Sep 2024 Location: Gothenburg Posts: 131
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Exactly how mine behaved. Don’t be fooled by the gauge behaviour. The needle will sit at nominal until a threshold is reached and then rise rapidly. It doesn’t show the actual temperature in a linear way. Once power is reduced it will drop just as fast.
I changed coolant and radiator and now no problem. Old radiator was blocked by mud and dirt to 25%, could’ve cleaned it but since it was 18 years old I just replaced it. |
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19th Aug 2025 9:09pm |
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| Sybrow Member Since: 31 Dec 2023 Location: Skipton Posts: 43
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Thanks JohanB
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19th Aug 2025 9:12pm |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 2470
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Note: The 2.4 ECU uses a cylinder head temperature sensor to calculate the coolant temperature whereas the 2.2 has a separate dedicated sensor to directly measure coolant temperature and feed that to the ECU.
Have you checked for loss of coolant ? NB. I hope it’s not the case, however a head gasket or head issue can cause similar symptoms, as could a leaking EGR cooler ( an issue with 2.2’s). So if temp sensor and radiator are found to be ok then a Reld test would be the next thing to do. |
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19th Aug 2025 10:07pm |
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| Sybrow Member Since: 31 Dec 2023 Location: Skipton Posts: 43
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Thanks IanH. Coolant was very low (virtually none in the header tank), so I topped it up.
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20th Aug 2025 5:03am |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 2470
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The radiator can spring a small leak on the lower nearside just above the hoses. A tell tale green stain on the radiator will show if it is leaking. Note Nissens make a very good and low price radiator which is at least as good , if not better, than the original.
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20th Aug 2025 10:54am |
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| Sybrow Member Since: 31 Dec 2023 Location: Skipton Posts: 43
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The filled coolant header tank was virtually empty again when I checked this afternoon. I could not see any leaks at the radiator, but could see coolant on the pipes off the back of the water pump
 Click image to enlarge |
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20th Aug 2025 6:51pm |
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