Under load there is a brief loss of power which sounds like cylinder deactivation.

[DJPoertsch]

Hello my friends from the forum.

I currently have a problem that I can't quite figure out. It manifests itself as follows. When I have to drive up a hill and I accelerate my Tahoe and then hold the accelerator pedal, I hear the engine for about 3 seconds, as if the cylinder deactivation is active and it doesn't want to accelerate properly during this time, then it stops after 3 seconds and you can feel it pushing forward. This repeats itself at longer intervals only when I'm under load.
At first I thought it was the ignition and completely replaced the spark plugs, cables and ignition coil. I drive with LPG here in Germany. But that wasn't the problem. Then I got the Tahoe up to 3000 rpm in the garage while it was standing still and held the gas and I noticed that at certain intervals it suddenly pushes the rpm up for about 2 seconds. As if something was accelerating on its own. I replaced the air mass meter 2 years ago. Do you have any idea where I could look again. I have this phenomenon with LPG and petrol. I would be grateful for any tips. Thanks

 

[DJPoertsch]

I found the problem. It is the air conditioning compressor. As soon as it turns on, I lose a lot of power. I had never had that before. As soon as the compressor clutch engages, I have a massive loss of performance. That I can hear it as described on the engine noise even really loud. My question now. Can I replace the clutch on the compressor or should I replace it completely.? It still cools, but the loss of power is really annoying

 

[j91z28d1]

you can replace the clutch but the new part is hard to find and takes a specific tool. most replace the whole thing.


I have never heard of a ac compressor getting harder to turn as it wears out. if you do replace it and the power loss goes away. please let us know. I've never heard of that.

 

[DJPoertsch]

First of all, thanks for the tips. By chance, I have already found a few posts here in the forum that had the same problem as me. In this case, cleaning of the throttle valve was suggested. Someone wrote that a user had replaced the compressor and it didn't work at first. Only the cleaning of the throttle flap would have helped. How could this be related? I only did an air conditioning service 3 days ago and replaced the service valve and also the gasket. I'll take a look at my throttle tomorrow

 

[DJPoertsch]

I found the actual error. It was my air conditioning compressor. He simply reduced the power too much. Apparently he was just too old. I have now installed a new one and lo and behold, you can notice that it switches on, but I no longer have this dramatic loss of performance. I'm glad my Tahoe is running better again now. Maybe this will help someone who has similar problems as me. Best regards.